Factors Controlling Meristematic Activity in Excised Roots VI. Effects of Various 'Antiauxins' on the Growth and Survival of Excised Roots of Lycopersicum esculentum, Mill.

1955 ◽  
Vol 8 (1) ◽  
pp. 48-62 ◽  
Author(s):  
H. E. Street
Keyword(s):  
Lycopersicum Esculentum ◽  
Growth And Survival ◽  
Meristematic Activity

Localisation par autoradiographie de l'acide [5-3H]indole-3-acétique dans le bourgeon terminal du Lycopersicum esculentum

1984 ◽  
Vol 62 (6) ◽  
pp. 1149-1157 ◽  
Author(s):  
D. Driss-Ecole ◽  
G. Perbal ◽  
Y. Leroux
Keyword(s):  
Total Radioactivity ◽  
Lycopersicum Esculentum ◽  
Meristematic Cells ◽  
Differentiated Cells ◽  
Apical Bud ◽  
Ethylcarbodiimide Hydrochloride ◽  
Meristematic Activity ◽  
Sieve Tubes ◽  
Whole Plants ◽  
Label Distribution

[3H]indoleacetic acid (AIA) was applied to the shoot tip of intact young plants of Tomato (Lycopersicum esculentum Mill.) for 10, 60, or 120 min. Autoradiograms of whole plants were prepared and liquid scintillation counts of stem segments and principal root segments were performed. Chromatographic analysis showed that 66% of the radioactivity was associated with AIA after 120 min of contact with [3H]AIA. Autoradiographs of semithin and ultrathin sections were prepared after treatment by DCC (1-(3-dimethyl-aminopropyl)-3-ethylcarbodiimide hydrochloride). The quantity of label per cell and the density of label were determined for all tissues of the apical bud. The density of label was greater for meristematic cells than for differentiated cells. The observed homogeneity of label distribution in the apical meristem shows that auxin levels do not play a prominent role in distinguishing between its lateral and axial zones. The density of label was similar in the apical and in the axillary bud of leaf 4. The cells of the rib meristem, which elongate to produce pith, were more intensely labelled than the other meristematic cells. The percentage of label was calculated for each tissue in a transverse section of the stem just below the apex. The amount of auxin was greatest in the parenchyma (axial and cortical) with lesser amounts in the procambium, phloem parenchyma, and xylem parenchyma. Vessels, which had the greatest density of label, did not contain more than about 3% of total radioactivity of the stem section, while sieve tubes had only 0.5%. Pathways of auxin transport and the role of AIA in regulating meristematic activity in the apical bud are discussed.

PREFERENSI PENEMPELAN, PERTUMBUHAN, DAN SINTASAN LARVA TERIPANG PASIR, Holothuria scabra PADA SUBSTRAT LAMUN YANG BERBEDA

2017 ◽  
Vol 11 (3) ◽  
pp. 249
Author(s):  
Lisa Fajar Indriana ◽  
Yuli Afrianti ◽  
Sitti Hilyana ◽  
Muhammad Firdaus Firdaus
Keyword(s):  
Survival Rate ◽  
Economic Value ◽  
Growth And Survival ◽  
Holothuria Scabra ◽  
Enhalus Acoroides ◽  
Randomized Design ◽  
Settlement Substrate ◽  
Cymodocea Rotundata ◽  
Syringodium Isoetifolium ◽  
Cymodocea Serrulata

Teripang pasir, Holothuria scabra merupakan komoditas hasil laut yang bernilai ekonomis tinggi. Penangkapan berlebihan stok di alam mendorong berkembangnya kegiatan budidaya. Penempelan merupakan fase kritis pada larva teripang karena terjadi peralihan sifat planktonis ke bentik yang memerlukan substrat. Penelitian ini bertujuan untuk mengetahui preferensi penempelan, pertumbuhan, dan sintasan larva H. scabra fase penempelan pada substrat lamun yang berbeda. Penelitian menggunakan metode rancangan acak lengkap dengan perlakuan empat jenis daun lamun berbeda dan lima ulangan. Perlakuan terdiri atas Enhalus acoroides (L-1), Syringodium isoetifolium (L-2), Cymodocea serrulata (L-3), dan Cymodocea rotundata (L-4). Jumlah awal larva sebanyak 1.000 individu dan substrat dirangkai dengan luasan yang sama sebesar 12 cm x 17 cm untuk setiap unit penelitian. Hasil penelitian menunjukkan jenis lamun yang digunakan sebagai substrat berpengaruh secara nyata terhadap preferensi penempelan dan sintasan larva teripang pasir, namun tidak berpengaruh terhadap pertumbuhan. E. acoroides menunjukkan hasil terbaik dengan preferensi penempelan 0,26 ind. cm-2 dan sintasan 10,66%; sehingga layak digunakan sebagai substrat penempelan dalam pembenihan teripang pasir, H. scabra.Holothuria scabra larvae on different seagrass substrates. By: Lisa Fajar Indriana, Yuli Afrianti, Sitti Hilyana, and Muhammad FirdausSandfish Holothuria scabra is marine commodities with a high economic value. Overfishing of natural stocks has compelled an interest to begin aquaculture practice. Settlement is a critical phase for the planktonic larvae as they will transform to benthic form in the presence of substrate. This study aims to evaluate the settlement preferences, growth, and survival rate of H. scabra larvae settled on different seagrass leaves. The research was conducted using the Completely randomized design with four different species of seagrass leaves and five replications. The treatments consist of Enhalus acoroides (L-1), Syringodium isoetifolium (L-2), Cymodocea serrulata (L-3), and Cymodocea rotundata (L-4). Initial number of larvae was 1,000 individuals and the substrate was set with same widthof 12 cm x 17 cm for each unit. Results of the experiment indicated that settlement preference and survival rate of H. scabra larvae was significantly affected by seagrass used as substrate while no significantly differences was observed for growth of larvae. E. acoroides showed the best result with 0.26 ind. cm-2 settelement preference and 10.66% survival rate, so that suitable to be used as settlement substrate in H. scabra hatchery.

Consumer Awareness, Consumer Protection, Service Quality and Loyalty: The Case of Long-term Insurance Consumers in Namibia

2019 ◽  
Vol 118 (8) ◽  
pp. 172-189
Author(s):  
Magreth B Tjizumaue ◽  
Krishna Govender
Keyword(s):  
Service Quality ◽  
Consumer Protection ◽  
Structural Equation ◽  
Insurance Industry ◽  
Business Practices ◽  
Consumer Awareness ◽  
Growth And Survival ◽  
Term Insurance ◽  
Protection Legislation

Due to the absence of appropriate Consumer Protection legislation in Namibia, there seems to be a lack of consumer protection, which may result in consumers being exploited. Since the literature reveals that Consumer Awareness, Consumer Protection, Service Quality and Customer Satisfaction influence Customer Loyalty, the aforementioned relationship was explored among consumers of long-term insurance products in Namibia. The researcher embedded the study in the Services Marketing and User’s Satisfaction/Dissatisfaction theory and developed a framework for creating a more aware consumer and thus contribute to the growth and survival of the long-term insurance industry in Namibia.  A survey was conducted using a questionnaire, among a judgmental sample of 407 long-term insurance consumers in Namibia and Structural Equation Modelling was used to analyse (eight) hypothesized relationships among the research constructs alluded to in the title of this study. In summary, it was ascertained that if the customers are fully aware (have sufficient knowledge of the products and their consumer rights), they will feel protected against unfair business practices. Furthermore, if they perceive having received quality services, they are more likely to be satisfied with the service provider and will therefore, remain loyal.

USAHA PENINGKATAN PRODUKSI TOMAT (Lycopersicum esculentum Mill) DENGAN PUPUK ORGANIK CAIR (POC)

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Junaidi Junaidi ◽  
Bambang Dwi Moeljanto
Keyword(s):  
Lycopersicum Esculentum

           Penelitian ini bertujuan untuk mengetahui apakah perbedaan dosis pupuk organic cair (POC) yang digunakan akan menghasilkan produksi dan pertumbuhan tomat yang tidak sama pula. Hipotesisnya yakni perbedaan perlakuan pemberian dosis pupuk organik cair akan berpengaruh nyata terhadap produksi dan pertumbuhan tomat.           Penelitian ini dilakukan dibawah rumah plastik dengan menggunakan polibag untuk tempat media tanam, sehingga lingkungan dapat dibuat homogen.  Oleh karena itu rancangan lingkungan yang digunakan adalah Rancangan Acak Lengkap (RAL).  Macam-macam dosis POC yang dicoba dalam penelitian ini adalah : D0 : Dosis 0 ml (tanpa POC); D1 : Dosis 5 ml / tanaman;  D2 : Dosis 10 ml / tanaman; D3 : Dosis 15 ml / tanaman; D4 : Dosis 20 ml / tanaman; D5 : Dosis 25 ml / tanaman.  Dari keenam dosis POC ini masing-masing diulang 4 kali, dan masing-masing ulangan terdiri  dari 2 tanaman dalam polibag (Duplo).           Hasil pengamatan terhadap parameter pertumbuhan dan produksi dianalisis dengan analisis ragam untuk mengetahui adanya pengaruh perlakuan dosis POC.  Bila terjadi perbedaan yang nyata maka untuk mengetahui perlakuan-perlakuan yang berbeda nyata dilakukan pengijian dengan uji Beda Nyata Terkecil (BNT 5%).  Penelitian ini menghasilkan kesimpulan Bahwa pemberian dosis POC dari bahan baku sampah dapur berpengaruh terhadap pertumbuhan tanaman tomat, tetapi tidak berpengaruh terhadap produksi tomat.Kata Kunci: POC, Tomat.

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