single cross
Recently Published Documents


TOTAL DOCUMENTS

427
(FIVE YEARS 85)

H-INDEX

29
(FIVE YEARS 3)

2021 ◽  
pp. 9-22

The study was conducted in order to identify the suitable parental inbred lines using top cross method for improvement of new sunflower F1 single cross hybrids at research field of Seed and Plant Improvement Institute in Karaj, Iran during two Crop season (2018 and 2019). Experimental materials consisted of 31 restore lines and 43 cytoplasmic male sterile lines which were crossed with A1221 and R14 as the testers respectively. The developed F1 hybrids were evaluated for GCA of three breeding objectives i.e. flowering time, plant height and grain yield during two years replicated trials. Cluster analysis revealed two heterotic groups in which the restorer lines; R22, R24 and R38 (Grain yield of 33, 32 and 31 g head-1 respectively) and three CMS lines; A32, A370 and A110 (Grain yield of 47, 44 and 43 g head-1 respectively) were identified as the suitable restorer and cytoplasmic male sterile line for improvement of new sunflower single cross hybrids. Evaluation of specific combing ability of the resulted combinations will reveal the efficiency of this selection in the following generation.


Author(s):  
Wisam Khald Sabri ◽  
Abdullah Oktem

Aims: The study was designed to elucidate the effect of different nitrogen (N) fertilizer levels on five different maize cultivars. Study Design:  A split plot experimental design in randomized complete blocks (RCBD) with three replicates. Arrangement of seven nitrogen levels and five single cross hybrids were compared. Main plots were nitrogen levels and subplots were varieties. Place and Duration of Study: College of Agricultural Engineering Sciences at the University of Duhok, Iraq. The study was undertaken fromMarch– August 2021. Methodology: At the present research, five single cross-hybrid corn varieties were used, which were: CADZ, DKC6050, DRACHMA, MYIMY and ZP6468D. Arrangement of seven nitrogen fertilizer levels were 0, 50, 100, 150, 200, 250 and 300 kg N ha−1. The following features were studied: plant height, leaf area index, thousand kernel weight, total grain yield, total chlorophyll, protein% and oil %.The collected data were projected to SAS software program for analysis. The significant differences between treatment means were calculated using Duncan’s multiple ranges. Results: It was reveal that there were significant effect of different nitrogen fertilizer levels, maize genotypes as well as the interaction of nitrogen and genotype of maize (P<.01) for plant height, leaf area index, 1000 kernel weight, total grain yield, total chlorophyll and protein %. However, There were no significant differences between different maize genotypes as well as different nitrogen fertilizer levels (P>.05) with oil %, but the interaction of nitrogen and genotype of maize was significant (P<.01). Conclusion: Increasing the amount of nitrogen had better effect on studied characteristics of different maize varieties, in which adding 300 kg nitrogen had optimum results. In considering the response of maize varieties to nitrogen, the best variety was DRACHMA genotype while the worst variety was CADZ genotype, however this hybrids was superior in some traits.


2021 ◽  
pp. 137-142
Author(s):  
Bal Krishna ◽  
Birender Singh ◽  
Shyam Sundar Mandal ◽  
Rashmi Kumari ◽  
Tushar Ranjan

Thirteen lines and three testers were used to produce 39 single cross maize hybrids by line Ítester mating design. The genetic divergence among thirteen lines and three tester of maize were estimated by using Mahalanobis D2 statistic for twelve characters. The genotypes were grouped into five clusters. Cluster I comprised 12 parental genotypes (L1, L2, L3, L4, L5; L6, L7, L8, L9, L11; L12, L13), while Cluster II (T3), III (T1), IV (L10) and V (T2) were mono-genotypic, suggesting more variability in genetic makeup of the genotypes included in these clusters. The correlation coefficients and linear regressions were used to know the effects of parental genetic distance in determining heterosis and per se performance of the hybrids. Parental genetic distance exhibited significant negative association and significant linear regression along with very low coefficient of determination with better parent heterosis (BPH) and non-significant with per se performance of the hybrids. The present investigation, therefore, the parental genetic distance has significant role in determining heterosis and hybrid performance in kharif maize.


2021 ◽  
Vol 12 ◽  
Author(s):  
Ponnaiah Govintharaj ◽  
Marappa Maheswaran ◽  
Michael Blümmel ◽  
Pichaikannu Sumathi ◽  
Anil Kumar Vemula ◽  
...  

Pearl millet is an important food and fodder crop cultivated in the arid and semi-arid regions of Africa and Asia, and is now expanding to other regions for forage purpose. This study was conducted to better understand the forage quantity and quality traits to enhance the feed value of this crop. Two sets of pearl millet hybrids (80 single cross hybrids in Set-I and 50 top cross hybrids in Set-II) along with their parents evaluated multi-locationally for the forage-linked traits under multi-cut (two cuts) system revealed significant variability for the forage traits in the hybrids and parents. The mean better parent heterosis (BPH) for total dry forage yield (TDFY) was 136% across all the single cross hybrids and 57% across all the top cross hybrids. The mean BPH for in vitro organic matter digestibility (IVOMD) varied from −11 to 7% in the single cross hybrids and −13 to 11% in the top cross hybrids across cuts. The findings of TDFY and IVOMD heterosis in these sets indicated the potential of improvement of the hybrid cultivars for forage quantity and quality in forage pearl millet. The parental lines single cross parent (SCP)-L02, SCP-L06, and top cross parent (TCP)-T08 found superior in the forage quantity and quality traits can be utilized in the future breeding programs. Most of the forage traits were found to be controlled by using the non-additive gene action. A diverse panel of 105 forage-type hybrid parents (Set-III) genotyped following genotyping by sequencing (GBS) and phenotyped for crude protein (CP) and IVOMD under multi-cuts for 2 years identified one stable significant single nucleotide polymorphism (SNP) on LG4 for CP, and nine SNPs for IVOMD distributed across all the linkage groups except on LG2. The identified loci, once validated, then could be used for the forage quality traits improvement in pearl millet through marker-assisted selection.


Author(s):  
R. Archana H. C. Lohithaswa ◽  
R. Pavan B. N. Swathi ◽  
N. Mallikarjuna

Globally, Maize (Zea mays L.) is a third major cereal food crop. It is a multipurpose crop with 26% of its production is used as food by human beings. Maize is known as “queen of cereals”, because of its high genetic yield potential, efficient utilization of radiant energy and wider adaptability. About 65 different phytopathogens affect the maize production in different stages of life cycle. Among which Fusarium moniliforme is one such soil borne pathogen causes Fusarium stalk rot (FSR) disease that ultimately reduces maize yield potential over the world. In any breeding program, screening and genetic testing of available germplasm resources against pathogens is necessary to prevent yield losses. Hence, the present research screened around 114 maize inbred lines and 45 single cross hybrids (SCHs) against FSR under artificial epiphytotic conditions. Among 114 inbreds, only four inbreds viz., CM 202, 10878, MAI-759 and MAI-766 (mean disease score of 3-4) showed moderately resistant reaction and out of 45 SCHs, only one hybrid combination i.e., MAI329 × CM202 (mean disease score was 2.60) exhibited resistance reaction against Fusarium stalk rot. Nevertheless, these resistance sources could be utilized in maize breeding programs for obtaining high yielding cultivars with resistance towards FSR disease.


Euphytica ◽  
2021 ◽  
Vol 217 (10) ◽  
Author(s):  
Mehdi Ghaffari ◽  
Amir Gholizadeh ◽  
Seyed Abbasali Andarkhor ◽  
Asadollah Zareei Siahbidi ◽  
Seyed Ahmad Kalantar Ahmadi ◽  
...  

2021 ◽  
Vol 6 (2) ◽  
pp. 97
Author(s):  
Rahmi Maulida ◽  
Nurhakim Nurhakim ◽  
Marselinus Untung Dwiatmoko

Di area Pit North West 2 yang terletak di Tutupan area Low Wall, pada saat ini kondisi jalan angkut yang kurang baik dan belum memenuhi standar parameter geometri jalan yang berpengaruh pada travel speed serta sistem lalulintas yang kurang aman yang berpengaruh pada pada safety lalulintas. Adapun beberapa geometri jalan angkut yang masih belum memenuhi desain standar parameter. Geometri jalan angkut aktual di area North West 2 meliputi lebar jalan lurus antara 21.69 – 30.90 meter, lebar jalan tikungan sebesar 30.17 meter, superelevasi sebesar - 0.6% dengan arah kemiringan terbalik serta cross slope yang terbentuk yaitu single cross slope dan masih ada yang kurang dari 2%. Road condition monitoring atau problem jalan yang ditemukan setiap minggu, lebih dominan pada banyaknya spoil yang mengakibatkan penyempitan jalan serta adanya jalan berdebu tebal yang juga berpengaruh pada lalulintas.Metode yang digunakan pada penelitian ini dengan cara peninjauan lapangan untuk melakukan pengamatan secara langsung terhadap situasi, kondisi, dan aktifitas di lokasi penelitian dan didasarkan pada metode pengukuran aktual di lapangan. Melakukan perhitungan geometri jalan berdasarkan rumus Suwandhi 2004, menganalisis problem jalan berdasarkan 5R (Ringkas, rapi, resik, rawat dan rajin) standar dari perusahaan serta membuat perbandingan travel speed pada bulan Oktober 2017 dengan bulan November 2017.Adapun rekomendasi desain untuk perencanaan geometri jalan angkut yang sesuai untuk dilewati dump truck Caterpillar 789 C adalah lebar jalan pada jalan lurus 28 meter, lebar jalan tikungan 34 meter, superelevasi maksimal 5%, cross slope 2%-4% dan grade jalan maksimum 8%. Alternatif solusi yang digunakan adalah alternatif A dengan melakukan pelebaran jalan dan menstandarkan geometri jalan angkut. Selalu melakukan 5R pada tiap minggunya serta selalu memperhatikan dan mematuhi rambu-rambu keselamatan kerja yang aman agar tidak terjadinya kecelakaan lalulintas selama kegiatan berproduksi berlangsung. Nilai travel speed pada bulan Oktober 2017 sebesar 18.06 km/jam dan pada bulan November 2017 sebesar 20.69 km/jam. Kata-kata kunci: safety, superel­evasi, cross slope, grade, road condition monitoring


Sign in / Sign up

Export Citation Format

Share Document