scholarly journals SKRINING GALUR KAPAS (Gossypium hirsutum L.) TOLERAN TERHADAP KEKERINGAN DENGAN PEG-6000 PADA FASE KECAMBAH

2020 ◽  
Vol 19 (3) ◽  
pp. 139 ◽  
Author(s):  
SIWI SUMARTINI ◽  
EMY SULISTYOWATI ◽  
SRI MULYANI ◽  
ABDURRAKHMAN ABDURRAKHMAN
Keyword(s):  
Gossypium Hirsutum ◽  
Root Length ◽  
Arable Land ◽  
Weight Ratio ◽  
Root Weight ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Drought Susceptibility Index ◽  
Peg 6000 ◽  
Susceptibility Index

<p>ABSTRAK<br />Daerah pengembangan kapas di Indonesia umumnya lahan kering<br />dengan keterbatasan air. Penelitian ini bertujuan untuk mendapatkan galur-<br />galur kapas toleran kekeringan menggunakan PEG-6000 pada fase<br />kecambah. Penelitian dilaksanakan di Laboratorium Pengujian Benih Balai<br />Penelitian Tanaman Pemanis dan Serat, mulai bulan April sampai Juni<br />2012. Perlakuan disusun dalam rancangan Petak Terbagi dan diulang dua<br />kali. Petak utama adalah perlakuan PEG-6000 (-3 bar) dan tanpa PEG-<br />6000 (air), sedangkan anak petak adalah 13 galur kapas dan varietas<br />Kanesia 14. Setiap perlakuan terdiri dari lima pot masing-masing ditanam<br />sepuluh biji. Benih kapas dicampur dengan fungisida Mancozeb 80% 2<br />g/kg benih sebelum ditanam. Parameter pengamatan meliputi daya<br />berkecambah, panjang kecambah dan akar, bobot kecambah dan akar,<br />rasio  panjang  akar/kecambah,  serta  indeks  kerentanan  terhadap<br />kekeringan. Kecambah dihitung sebagai kecambah normal jika panjang<br />lebih dari 0,5 cm. Perlakuan PEG-6000 berpengaruh sangat nyata terhadap<br />penurunan daya berkecambah, panjang kecambah dan akar, serta bobot<br />kecambah dan akar. Sebaliknya, rasio panjang akar/kecambah lebih tinggi<br />pada perlakuan PEG-6000 dibandingkan dengan perlakuan tanpa PEG-<br />6000. Respon ketahanan galur kapas yang dihitung dengan indeks<br />kerentanan kekeringan berbeda pada masing-masing parameter yang<br />diamati. Dari nilai rata-rata indeks kerentanan kekeringan semua<br />parameter, tidak ada galur yang tahan terhadap kekeringan (S&lt;0,50).<br />Terdapat delapan galur yang agak tahan kekeringan (0,50&lt;S&lt;1,0) dan<br />lebih tahan dibandingkan dengan Kanesia 14, yaitu 03002/12, 03006/1,<br />03008/7, 03008/24, 03012/17, 03014/12, 03017/13, dan 03017/15.<br />Kata kunci: Gossypium hirsutum L., tahan kekeringan, PEG-6000,<br />perkecambahan, galur</p><p>ABSTRACT<br />Cotton production areas in Indonesia are arable land with lack of water<br />availability. The aim of this study was to obtain cotton lines tolerant to<br />drought using PEG-6000 at germination stage. The experiment was<br />conducted at the Seed Testing Laboratory in Indonesian Sweetener and<br />Fiber Crops Research Institute, from April to June 2012. Treatments were<br />arranged in a Split Plots design with two replications. The main plot was<br />PEG-6000 (-3 bar) and without PEG-6000 (water), while the subplot was<br />13 cotton lines and Kanesia 14 variety. Seed cotton was treated with 80%<br />Mancozeb fungicide dose of 2g/kg seed before sowing. Parameters<br />observed were germination percentage, shoot and root length, shoot and<br />root weight, ratio of root/shoot length, and drought susceptibility index.<br />Seedling was counted as normal if its length more than 0.5 cm. PEG-6000<br />treatment gives very significant effect on the decline on seed germination,<br />shoot and root length, shoot and root weight. Otherwise, ratio of root/shoot<br />length was higher in the PEG-6000 than without PEG-6000 treatment.<br />Response of cotton lines to drought which calculated with a drought<br />susceptibility index were different among parameter observed. Mean<br />drought susceptibility index of all parameters showed that none of cotton<br />line tolerant to drought (S &lt; 0,50) was achieved from the study. There<br />were eight moderately drought-resistant lines (0, 50 &lt; S &lt; 1,0) achieved<br />namely 03002/12, 03006/1, 03008/7, 03008/24, 03012/17, 03014/12,<br />03017/13, and 03017/15 which more resistance than Kanesia 14.<br />Key words: Gossypium hirsutum L., drought tolerant, PEG-6000,<br />germination, lines</p>

Response of a Red Fescue-Kentucky Bluegrass Turf to Three Consecutive Annual Applications of Amidochlor, Mefluidide, and Ethephon

Weed Science ◽  
1987 ◽  
Vol 35 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Prasanta C. Bhowmik
Keyword(s):  
Adverse Effects ◽  
Phosphonic Acid ◽  
Root Length ◽  
Poa Pratensis ◽  
Weight Ratio ◽  
Kentucky Bluegrass ◽  
Root Weight ◽  
Festuca Rubra ◽  
Red Fescue ◽  
Greenhouse Study

A red fescue (Festuca rubraL.)- Kentucky bluegrass (Poa pratensisL.) turf was treated annually with amidochlor {N-[(acetylamino)methyl]-2-chloro-N-(2,6-diethylphenyl)acetamide} at 2.2, 2.8, and 3.4 kg ai/ha, mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide} at 0.4 kg ai/ha, and ethephon [(2-chloroethyl) phosphonic acid] at 5.6 kg ai/ha for three consecutive years. Recuperative potential of treated turfgrass was determined in the field and in a greenhouse study. Amidochlor and mefluidide treatments injured turfgrass (11 to 64%) four weeks after application. However, turfgrass recovered after eight weeks. Amidochlor at 2.8 to 3.4 kg/ha and mefluidide at 0.4 kg/ha suppressed (75 to 100%) seedhead development. Ethephon at 5.6 kg/ha was ineffective. Turfgrass recovered normally each spring after amidochlor treatments, with no delay in spring green-up. Root length, root weight, and root:shoot weight ratio of the plugs from the greenhouse study were unaffected by three consecutive annual applications of amidochlor, mefluidide, and ethephon. One annual spring application of amidochlor, mefluidide, and ethephon for three consecutive years caused no adverse effects that would limit their use on red fescue-Kentucky bluegrass turf.

scholarly journals AMBANG KENDALI PENGGEREK BUAH KAPAS, Helicoverpa armigera, DENGAN MEMPERHITUNGKAN KEBERADAAN PREDATOR PADA KAPAS

2020 ◽  
Vol 14 (2) ◽  
pp. 72
Author(s):  
NURINDAH NURINDAH ◽  
DWI ADI SUNARTO
Keyword(s):  
Gossypium Hirsutum ◽  
Pest Control ◽  
Natural Enemies ◽  
Helicoverpa Armigera ◽  
Threshold Level ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Action Threshold ◽  
Helicoverpa Armígera ◽  
Predatory Mirid

ABSTRAK<br />Helicoverpa armigera adalah salah satu hama utama pada kapas,<br />sehingga perlu dikendalikan. Konsep ambang kendali sebagai salah satu<br />komponen dalam PHT telah dikembangkan untuk H. armigera, namun<br />hanya berdasarkan populasi hama dan belum mempertimbangkan<br />keberadaan musuh alami. Penelitian ini bertujuan untuk menguji ambang<br />kendali H. armigera dengan mempertimbangkan keberadaan musuh alami<br />pada skala luas di daerah pengembangan dengan menggunakan lahan<br />petani. Penelitian ini dilakukan pada pertanaman kapas tumpangsari<br />dengan kedelai yang ditanam sesudah padi di Kecamatan Mantup dan<br />Kembangbau, Lamongan, Jawa Timur pada Maret-Oktober 2005. Lahan<br />yang digunakan seluas 15 hektar, di bawah pengelolaan 36 petani.<br />Pengujian ambang kendali H. armigera dilakukan dengan menerapkan dua<br />perlakuan konsep ambang kendali yang merupakan bagian dari PHT<br />kapas, yaitu: (1) AKH: 4 tanaman terinfestasi/25 tanaman contoh; dan (2)<br />AKH+MA: 4 tanaman terinfestasi/25 tanaman contoh; jumlah tanaman<br />yang terinfestasi yang teramati dikurangi 1 jika ditemukan 8 ekor predator<br />dan kelipatannya. Jika populasi pada petak perlakuan mencapai ambang<br />kendali, dilakukan penyemprotan dengan Ekstrak Biji Mimba (EBM).<br />Setiap lahan petani dibagi dua, setiap bagian menerapkan satu perlakuan<br />(n=36). Pengamatan dilakukan pada 25 unit pengamatan per 1,0 ha yang<br />diambil secara W sampling, setiap 7 hari sejak 50 hari setelah tanam (hst)<br />hingga 90 hst. Satu unit pengamatan adalah 1 m 2 . Parameter yang diamati<br />secara periodik adalah populasi H. armigera (telur dan larva); kerusakan<br />buah, hasil kapas berbiji, serta penggunaan saprodi dan tenaga kerja untuk<br />pengendalian hama. Data yang diperoleh dianalisa dengan menggunakan<br />uji t. Hasil penelitian menunjukkan bahwa populasi H. armigera pada<br />kapas + kedelai dapat ditekan oleh musuh alaminya, khususnya kompleks<br />predator yang terdiri atas laba-laba, kumbang kubah dan kepik mirid.<br />Populasi kompleks predator dapat mencapai 40-80 ekor/25 tanaman.<br />Dengan demikian, penerapan ambang kendali H. armigera pada kapas +<br />kedelai dengan memperhitungkan keberadaan predator menyebabkan tidak<br />perlu dilakukannya penyemprotan insektisida sama sekali, sehingga<br />terdapat keuntungan ekonomis, yaitu penghematan biaya saprodi sebesar<br />Rp 259.000 per hektar dan keuntungan ekologis, yaitu tidak tercemarnya<br />lingkungan oleh senyawa toksik.<br />Kata kunci : Kapas, Gossypium hirsutum L., ambang kendali, Helicoverpa<br />armigera, Jawa Timur<br />ABSTRACT<br />Action  threshold  for  Helicoverpa  armigera  by<br />considering the presence of predators on cotton<br />Helicoverpa armigera on cotton was considered as the main pest,<br />therefore it always be a focus of pest control. Action threshold concept as<br />an IPM component had been developed for H. armigera on cotton;<br />however it has not considered the presence of natural enemies. The<br />objective of this research is to test the action threshold of H. armigera by<br />considering the presence of natural enemies on cotton intercropped with<br />soybean in farmers’ fields. The test involved 15 hectares of farmers’<br />fields (involving 36 farmers) in Lamongan, East Java in March-October<br />2005. The action thresholds for H. armigera tested were: (1) AKH: 4<br />infested plants/25 sample plants; and (2) AKH+MA: 4 infested plants/25<br />sample plants, and the number of infested plants observed was subtracted<br />by 1 when 8 predators, and it’s folded up, were found in the sample plants.<br />Spray of neem seed extract (NSE) was applied when the pest population<br />reached action threshold level. Each farmer field was divided into two<br />parts to accommodate the treatments. The observations were made<br />periodically on 25 units per 1,0 hectare in 7-days interval on 50 – 90 days<br />after planting (dap). The size of observation unit was 1 m 2 . Parameters<br />observed included H. armigera population (egg and larva); damage bolls,<br />seed cotton production and the cost of pest control. Data were analysed by<br />using t-test. The results showed that H. armigera population on cotton<br />intercropped with soybean could be repress by its natural enemies,<br />especially by the complex predator (consisted of spiders, lady bird beetles<br />and predatory mirid bugs) to be always under action threshold level. The<br />application of action threshold by considering the presence of predator in<br />cotton + soybean fields would lead to unsprayed cultivation. Resulted<br />economical benefit by saving of the production cost Rp 259.000 per<br />hectare as well as ecological advantage by avoiding of sprays of toxic<br />materials in the environment.<br />Key words : Cotton,  Gossypium  hirsutum  L.,  action  threshold,<br />Helicoverpa armigera, East Java

scholarly journals Respon Pemberian Paclobutrazol pada Beberapa Varietas Kapas (Gossypium hirsutum L.) di Lahan Sawah Sesudah Padi

2016 ◽  
Vol 3 (1) ◽  
pp. 30
Author(s):  
Budi Santoso ◽  
Fitriningdyah Tri Kadarwati
Keyword(s):  
Gossypium Hirsutum ◽  
Block Design ◽  
Natural Fibre ◽  
Raw Material ◽  
Paddy Fields ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Marginal Lands ◽  
Productivity Level ◽  
Randomized Block Design

<p>Kapas (Gossypium hirsutum L.) merupakan penghasil serat alam yang digunakan untuk bahan baku tekstil. Pengembangan kapas diarahkan ke lahan-lahan marginal, walaupun sebagian ada yang ditanam pada sawah sesudah padi. Tingkat produktivitas serat kapas, saat ini masih rendah sekitar 0,8 sampai dengan 1 ton per hektar. Usaha peningkatan produksi kapas antara lain dengan pemberian zat stimulan (paclobutrazol), teruta-ma untuk memacu pertumbuhan vegetatif dan generatif seperti tinggi tanaman, jumlah cabang, jumlah bu-nga, dan jumlah buah. Kedua komponen tersebut menjadi penentu hasil serat. Paclobutrazol adalah zat stimu-lan bagi tanaman. Penelitian dilaksanakan di Kebun Percobaan Sumberrejo, Bojonegoro pada bulan Mei sam-pai dengan Oktober 2010, pada lahan sawah sesudah padi. Perlakuan disusun secara faktorial dengan meng-gunakan rancangan acak kelompok yang diulang sebanyak empat kali. Sebagai faktor pertama adalah 4 varietas kapas yang terdiri atas 1) Kanesia 8, 2) Kanesia 13, 3) Kanesia 14, dan 4) Kanesia 15. Faktor kedua adalah pemberian paclobutrazol melalui penyemprotan pada tanaman dengan dosis: a) 0; b) 1,50 l/ha diberikan sekali pada umur 60 hari; dan c) 1,50 l/ha diberikan dua kali umur 60 hari dan 75 hari. Hasil penelitian menunjukkan bahwa kapas varietas Kanesia 8 dan 13 yang ditanam di lahan sawah sesudah padi mempunyai pertumbuhan vegetatif dan generatif optimal, kemudian disusul dengan Kanesia 13, Kanesia 14, dan Ka-nesia 15. Paclobutrazol yang disemprotkan pada tanaman kapas, tidak berpengaruh nyata terhadap pertumbuhan baik vegetatif maupun generatif. Hasil kapas berbiji untuk varietas kapas Kanesia 8 dan Kanesia 13 sama, masing-masing sebesar 1.643 kg/ha dan 1.686 kg/ha.</p><p> </p><p>Cotton is a natural fibre crop for some textile raw material. The development of cotton is directed mainly to marginal lands, although few of it is planted in paddy fields after rice harvested. The productivity level of cotton fibre, is still low, about 0.8 to 1 ton per hectare. Effort to increase cotton production is done through the application of growth regulator aiming at enhancing to the growth of plant height, number of branches, number of flower, and boll. These components are fibre determinans. Research conducted at Sumberrejo Ex-perimental Garden, Bojonegoro from May to October 2010, in paddy fields after rice harvested. Factorial treat-ment arranged using randomized block design repeated four times. The first factor consisting of four cotton varieties: 1) Kanesia 8, 2) Kanesia 13, 3) Kanesia 14, and 4) Kanesia 15. The second factor is application of pa-clobutrazol by spraying the plants with usage of: a) 0, b) 1.50 l/ha given once at age 60 days, and c) 1.50 l/ ha given twice at the age of 60 days and 75 days. The research showed that Kanesia 8 and Kanesia 13 varie-ties gave optimum vegetative and generative growth followed with Kanesia 13, Kanesia 14, and Kanesia 15. Paclobutrazol did not contribute significant effect on the growth of both vegetative and generative of cotton. The productivity of seed cotton of Kanesia 8 and Kanesia 13, 1,643 kg/ha and 1,686 kg/ha, respectively.</p>

Impact of short-term exposure to cold night temperatures on early development of cotton (Gossypium hirsutum L.)

2004 ◽  
Vol 55 (6) ◽  
pp. 655 ◽  
Author(s):  
M. P. Bange ◽  
S. P. Milroy
Keyword(s):  
Gossypium Hirsutum ◽  
Cold Shock ◽  
Production Systems ◽  
Management Strategies ◽  
Plant Morphology ◽  
Dry Weight ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Cold Night ◽  
Short Term Exposure

Regression analysis of field data has indicated that minimum daily temperatures below 11°C delay the development of cotton (Gossypium hirsutum L.) seedlings beyond what would be expected based on the accumulated degree-day sum. In Australian cotton production systems, events where the minimum daily temperature falls below this value are referred to as ‘cold shocks’. The number of cold shocks is used by growers and advisors in assessing retardation of crops in their areas. However, this effect has not been tested explicitly. The aim of this work was to empirically assess effects of cold shock on pre-flower development of cotton plants. Cotton seedlings were grown in controlled-temperature glasshouses. Plants were transferred to cold chambers ranging from 5 to 22°C during the night period for durations from 3 to 10 days. Negative effects were not seen until plants had been exposed to at least 10 nights at 10°C, or for at least 5 nights at 5°C. When differences were generated it did not delay development to first square any more than 4 days, nor was the effect consistent. These differences translated into delays to first flower, but had little effect on plant morphology, or on dry weight measured soon after flowering. In one experiment, a significant reduction in leaf photosynthesis was measured at two times of day on the day after cold shock at 5°C. Improving understanding of the effects of temperature extremes on cotton growth and development will help in developing more functional decision-support tools and field management strategies.

scholarly journals Evaluation et sélection d’une variété de cotonnier (FK64, Gossypium hirsutum L.) au Burkina Faso

2020 ◽  
Vol 14 (3) ◽  
pp. 869-882
Author(s):  
Larbouga Bourgou ◽  
Windpouiré Vianney Tarpaga ◽  
Sidiki K. Diane ◽  
Denys Sanfo
Keyword(s):  
Gossypium Hirsutum ◽  
Burkina Faso ◽  
Fiber Quality ◽  
Bt Cotton ◽  
Market Demand ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Seed Index ◽  
Production Areas ◽  
Multilocation Trials

Le coton du Burkina Faso est presqu’entièrement exporté ; les variétés cultivées doivent régulièrement répondre aux exigences du marché. Une fratrie de lignées de cotonnier a été comparée à deux variétés, FK37 et Stam 59A, respectivement dans les zones cotonnières humides et sèches de 2006 à 2009, pour mettre en exergue celle qui améliore les performances agronomiques et technologiques de fibre de ces témoins. A l’issue d’évaluations multilocales, FK64 et FK69 ont été identifiées comme de potentielles nouvelles variétés et testées en milieu paysan. Dans les zones humides, FK64 et FK69 n’ont pas apporté d’amélioration significative ; il est inopportun de les y vulgariser. Dans les zones sèches, FK64 a le mieux performé et a été retenue pour y être vulgarisée. Elle apporte un surplus en pourcentage fibre (+ 0,41%) et en seed index (+ 0,35 g). Aussi, elle apparait meilleure que Stam 59A pour la longueur (+ 1,44 mm) et la ténacité (+ 1,90 g/tex), deux caractéristiques déterminantes du marketing de la fibre. Avec la suspension du coton Bt et le retour à la culture conventionnelle, FK64 lancée en culture commerciale a convaincu. Elle pourrait être candidate à la transformation en cas de retour dans la technologie Bt.Mots clés: Evaluations multilocales, tests variétaux, caractéristiques agronomiques, caractéristiques technologiques, Burkina Faso.   English Title: Assessment and selection of a cultivar of cotton (FK64, Gossypium hirsutum L.) in Burkina Faso Cotton produced in Burkina Faso is almost entirely exported; so cultivars must be developed following the market demand. A sibling of cotton lines was compared to two varieties, FK37 and Stam 59A, respectively in humid and dry cotton production areas between 2006 and 2009 to highlight which one enhances agronomic and fiber quality performances compared to the local control. After multilocation trials, FK64 and FK69 were highlighted as promising news varieties then evaluated under farmer’s conditions of production. In the humid areas, FK64 as well as FK69 did not bring any significant improvement; it was not recommended to release any of them there. In the dry production areas, FK64 performed better, then it was retained to be possibly popularized. It brings a surplus in terms of ginning out turn (+ 0,41%) and seed index (+ 0,35 g). Moreover, it outperformed Stam 59A in fiber length (+ 1,44 mm) and strength (+ 1,90 g/tex), two major cotton fiber marketing properties. At the morrow of the suspension of the Bt cotton and back to conventional production, FK64 was launched in commercial production and it convinced. It could be aspirant to Bt introgression in case country resumes back to the technology.Keywords: multilocation trials, varietal trials, agronomical characteristics, fiber properties, Burkina Faso.

scholarly journals Determining Planting Window for Growing Upland Cotton (Gossypium hirsutum L.) during Dry Season in Bandarban, Bangladesh

2021 ◽  
Vol 24 (2) ◽  
pp. 1-14
Author(s):  
A Hamid ◽  
MG Neogi ◽  
MS Marma ◽  
JC Biswas ◽  
AS S Marma ◽  
...  
Keyword(s):  
Gossypium Hirsutum ◽  
High Temperatures ◽  
Upland Cotton ◽  
Growing Season ◽  
Dry Season ◽  
Growth And Yield ◽  
Cotton Production ◽  
Gossypium Hirsutum L ◽  
Poor Growth ◽  
Post Monsoon

Farmers in the Chattogram Hill Tracts, Bangladesh have been growing cotton (Gossypium hirsutum L.) in their traditional system of jhum cultivation which is undergoing transformation. Growing rainfed cotton as a monocrop in the uplands is constrained by farmers’ socio-economic conditions and erratic rainfall. Shifting growing season to post-monsoon dry monthscould be an option to sustain cotton production in hilly areas. An exploratory experiment was conducted for two seasons to explore the possibility of growing cotton in valley lands in Bandarban during dry season. Growth and yield potentials of dry season cotton were evaluated in relation to prevailing environmental conditions. Night temperature dropped to 9oC on several occasions in 2018-2019 season; but it remained higher than 11oC throughout the season in 2019-2020. In 2018-2019, day temperatures surged higher past March 15 occasionally exceeding 38oC. Variability in temperatures was more in 2018-19 while average temperatures were higher in 2019-20 season. Rainfall distribution was almost similar in both the growing seasons receiving total rainfall of 757 mm and 579 mm in two seasons, respectively. Higher seed cotton yield (2,047 kg per ha) was recorded for 15 November planted crop compared with 1 December planted crop (1,186 kg per ha). December 1 planted crop was affected more by low temperatures at seedling stage resulting in poor growth and fewer bolls per plant. Late planted crop was more vulnerable to rain damage at boll opening stage. Crops of both the seasons encountered high temperatures (>32oC) during boll development. Changing climate, shorter winter season and rising temperatures may allow cotton production in valley lands shifting growing season from rainy season to post-monsoon dry months. However, the window of dry season cotton growing in Bandarban, Bangladesh seems narrow. Rainfall pattern restricts planting seeds prior to mid-November. Again, high temperatures stress in March and April synchronizing boll development, and rainfall toward late April and May during boll opening may cause yield loss. Development and adoption of short duration, low temperature tolerant upland cotton varieties might be of advantage for adapting to climate change vulnerabilities. Ann. Bangladesh Agric. (2020) 24(2): 1-14

scholarly journals Correlations between Cotton Characteristics in Greek Multi-environments

2017 ◽  
Vol 5 (4) ◽  
pp. 170
Author(s):  
Vasileios Greveniotis ◽  
Evangelia Sioki ◽  
Constantinos G. Ipsilandis
Keyword(s):  
Gossypium Hirsutum ◽  
Cotton Fiber ◽  
Upland Cotton ◽  
Fiber Length ◽  
Short Fiber ◽  
Reliable Data ◽  
Cotton Production ◽  
Short Fibers ◽  
Gossypium Hirsutum L

Correlations of data provided by AFIS and HVI were performed under a multi-location evaluation of cotton fiber characteristics in the Greek environment. Four main cotton-production Greek regions were selected and the five most cultivated commercial upland cotton (Gossypium hirsutum L.) cultivars were used for evaluation of fiber length and short fiber characteristics by AFIS and HVI instruments. Each cultivar was sown in 16 fields and 80 fields in total were used for all cultivars. Both HVI and AFIS gave reliable data concerning fiber length and short fiber estimations. High positive and statistically significant correlations between the two instruments were found indicating the similarity of final measurements. Fiber length estimations can be performed with higher accuracy than short fiber estimations, because CV values were lower for both instruments. HVI and AFIS showed different advantages in estimating fiber length and short fiber characteristics. Measurements of AFIS on fiber length had a smaller range between maximum and minimum values, but HVI showed lower CV% which is more useful for breeders, since it may indicate gene fixation that ensures easier breeding procedure. For short fibers, AFIS also showed a smaller range between maximum and minimum values and HVI showed lower CV%. Graphical comparisons between HVI and AFIS measurements for fiber length and short fibers showed that HVI had a more pattern with lower fluctuations than AFIS.

scholarly journals DETERIORAÇÃO, ENDURECIMENTO E ANORMALIDADES EM SEMENTES E PLÂNTULAS DE ALGODOEIRO HERBÁCEO (Gossypium hirsutum L. r. latifolium H.) SOB ESTRESSE HÍDRICO

1998 ◽  
Vol 2 (2) ◽  
pp. 186-194 ◽  
Author(s):  
José Rodrigues Pereira ◽  
Pedro Dantas Fernandes ◽  
Napoleão Esberard de Macêdo Beltrão
Keyword(s):  
Gossypium Hirsutum ◽  
Gossypium Hirsutum L ◽  
Peg 6000 ◽  
De Se

RESUMO Conduziu-se um experimento em laboratório, com o objetivo de se estudar o comportamento germinativo de sementes de 10 genótipos de algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium H.) de fibras médias, de promissora potencialidade produtiva e tecnológica, e identificar os mais e os menos sensíveis em baixos níveis de potencial osmótico (0.0, -0.2, -0.4, -0.6, -0.8 e -1.0MPa), simulados por polietileno glicol-6000; foi utilizado papel Germitest, num delineamento inteiramente casualizado, em esquema fatorial 10 x 6, com 4 repetições, cada uma contendo 50 sementes. Foram verificadas diferenças de comportamento entre os genótipos de algodoeiro herbáceo estudados nos diversos níveis de estresse hídrico; a percentagem de sementes deterioradas e de plântulas anormais, nos dez genótipos, diminuiu mas a de sementes duras aumentou, nos níveis de maior concentração de PEG-6000. As cultivares CNPA Precoce 2 e CNPA Precoce 1 são as menos sensíveis a baixos potenciais osmóticos (-0,6 e -0,8MPa), enquanto LG ROGERS e CNPA 7H são medianamente sensíveis. A linhagem CNPA 86-1195-1 é a mais afetada.

scholarly journals Effects of exogenous and foliar applications of Brassinosteroid (BRs) and salt stress on the growth, yield and physiological parameters of Lycopersicon esculentum (Mill.)

2017 ◽  
Vol 4 (3) ◽  
pp. 88-101 ◽  
Author(s):  
Muhammad Irfan ◽  
Jan Alam ◽  
Imran Ahmad ◽  
Imtiaz Ali ◽  
Humaira Gul
Keyword(s):  
Salt Stress ◽  
Lycopersicon Esculentum ◽  
Plant Height ◽  
Root Length ◽  
Foliar Spray ◽  
Weight Ratio ◽  
Growth Yield ◽  
Root Weight ◽  
Salinity Levels ◽  
Number Of Leaves

The germination response of Lycopersicon esculentum was studied on different salinity levels from control (non-saline), 0.2,0.4,0.6 and 0.8% NaCl solution. Seeds germinating under salt stress exhibited decrease in saline media as compared to respective control. Seeds germinating with salinity and brassinosteroid (applied exogenously through roots and as foliar spray, 0.25 and 0.5 ppm) exhibited promotion in control as compared to their respective saline media. Plants treated with different salts concentrations (60 and 100mM) NaCl exhibited reduction in plant height, root length, number of leaves, number of fruits and biomass as compared to control while brassinosteroid having concentrations of 0.25 and 0.5 ppm (applied through roots and as foliar spray) caused promotion in plant height, root length, number of leaves, number of fruits and biomass in saline and non saline media. Plants treated with different salts concentration of (60 and 100mM) NaCl exhibited increase in Relative water content, leaf water loss, electrolyte leakage, shoot/- root ratio, root/- weight ratio and leaf/- weight ratio at both NaCl concentrations (60 and 100 mM) as compared to control, while stem/- weight ratio showed reduction at both salinity levels as compared to control while brassinosteroid applied in roots and as a foliar spray at 0.25 and 0.5 ppm concentrations exhibited reduction in stem/- weight ratio at high NaCl level (100 mM) as compared to control. 

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