Phenological variation among Israeli populations of Cicer judaicum Boiss.

2005 ◽  
Vol 56 (11) ◽  
pp. 1219 ◽  
Author(s):  
Roi Ben-David ◽  
Shahal Abbo
Keyword(s):  
Flowering Time ◽  
Variance Components ◽  
Differential Response ◽  
Shoot Development ◽  
Population Variance ◽  
Main Shoot

To obtain knowledge about the phenological adaptation of wild Cicer, we studied Israeli populations of Cicer judaicum and quantified the flowering time and morphological vernalisation response. Vernalisation treatment led to a similar advance in flowering time in Israeli C. judaicum and in Turkish C. reticulatum. The two wild taxa, however, showed differential response in main shoot development following the vernalisation treatment. Between- and within-population variance components of the measured traits were estimated. Phenological variation between populations exceeded the variation between accessions within populations. We suggest that increasing the number of sampling sites at the expense of more intensive collection within sites is likely to optimise collection strategy for this species.

The effect of leaf removal on flowering time in subterranean clover

1970 ◽  
Vol 21 (6) ◽  
pp. 893 ◽  
Author(s):  
WJ Collins ◽  
Y Aitken
Keyword(s):  
Flowering Time ◽  
Subterranean Clover ◽  
Early Growth ◽  
Grazing Management ◽  
Flower Initiation ◽  
Leaf Removal ◽  
Main Shoot ◽  
Delayed Flowering ◽  
Leaf Appearance ◽  
Rate Of Leaf Appearance

The removal of fully expanded leaves delayed flowering by up to 30 days in subterranean clover cv. Mt. Barker sown in winter at Melbourne (38�S.). This effect on flowering was attributable partly to a delay in flower initiation and partly to a slower rate of leaf appearance after flower initiation. Thus leaf removal may be added to the factors already known to influence flower initiation in subterranean clover. When plants were grown under a 24 hr photoperiod. leaf removal had no effect on flower initiation; the slight delay that leaf removal caused in flowering was therefore due entirely to its effect in reducing the rate of leaf appearance. In other experiments leaf removal delayed the time of flower initiation but had no effect on the rate of leaf appearance. The effect of leaf removal on the time of flowering on the main shoot in lateral-dominant plants (as occur in the field) was qualitatively the same as in plants from which the laterals had been removed. Grazing management of subterranean clover which results in severe defoliation during early growth may delay flowering to such an extent that seed production is reduced substantially, and persistence thereby prejudiced.

scholarly journals Heritabilitas dan Hubungan Antar Karakter Kuantitatif Kecipir (Psophocarpus tetragonolobus (L.) DC) pada Tiga Lingkungan

2021 ◽  
Vol 49 (1) ◽  
pp. 68-74
Author(s):  
Dian Rakhmad ◽  
Muhamad Syukur ◽  
Willy Bayuardi Suwarno
Keyword(s):  
Genetic Variability ◽  
Path Analysis ◽  
Flowering Time ◽  
Variance Components ◽  
Seed Weight ◽  
Winged Bean ◽  
Seed Number ◽  
Psophocarpus Tetragonolobus ◽  
High Productivity ◽  
Positive Direct

Winged bean (Psophocarpus tetragonolobus (L.) DC) is known as tropical soybean with high nutritional content. Lack of information on the variance components and heritability of winged bean breeding is one of the reasons for the lack of winged bean breeding programs in Indonesia. This reseach aimed to obtain information on variance components, heritability and relationship between winged bean traits. The experiment was conducted in three environments, from January 2019 to June 2020. Two environments located in Bogor and one in Palembang. Eleven genotypes of winged bean were tested and 11 traits were observed. The result showed that flowering time and seed number per pod performed wide genetic variability. High heritability was observed on seed number per pod (89.48%), flowering time (83.32%), young pods length (70.97%), and weight of 100 seeds (68.63%). The results of correlation analysis and path analysis showed that young pod productivity (1.07), seed weight per plot (0.81), flowering time (0.29), young pod length (0.17), young pod width (0.12), seed weight per plant (0.09), and 100 seeds weight (0.01) had a positive direct effect on wing bean productivity. Flowering time, seed number per pod, seed weight per plant are suitable characters for selection criteria for breeding high productivity winged bean. Keywords: correlation, genetic variability, path analysis

Correct and incorrect estimation of within-day and between-day variation.

1986 ◽  
Vol 32 (9) ◽  
pp. 1734-1737 ◽  
Author(s):  
M J Bookbinder ◽  
K J Panosian
Keyword(s):  
Statistical Theory ◽  
Analysis Of Variance ◽  
Variance Components ◽  
Total Population ◽  
Total Variance ◽  
Population Variance ◽  
Biased Estimators ◽  
The Impact ◽  
Estimation Of Variance

Abstract Between-day variance is an ambiguous term representing either total variance or pure between-day variance. In either case, it is often incorrectly calculated even though analysis of variance (ANOVA) and other excellent methods of estimation are available. We used statistical theory to predict the magnitude of error expected from using several intuitive approaches to estimation of variance components. We also evaluated the impact of estimating the total population variance instead of pure between-day variance and the impact of using biased estimators. We found that estimates of variance components could be systematically biased by several hundred percent. On the basis of these results, we make recommendations to remove these biases and to standardize precision estimates.

Herbicide Cross-Resistance in Slender Foxtail (Alopecurus myosuroides)

Weed Science ◽  
1990 ◽  
Vol 38 (6) ◽  
pp. 492-496 ◽  
Author(s):  
Stephen R. Moss
Keyword(s):  
Methyl Ester ◽  
Petri Dish ◽  
Differential Response ◽  
Shoot Development ◽  
Pot Experiment ◽  
Cross Resistance ◽  
Alopecurus Myosuroides ◽  
Whole Plant ◽  
Two Populations ◽  
Dinitroaniline Herbicides

The resistance of four populations of slender foxtail from England to chlorotoluron, pendimethalin, and the methyl ester of diclofop was studied in whole-plant spray assays. Two populations showed cross-resistance to all three herbicides while a third showed resistance to chlorotoluron only. Resistance, although not absolute, was sufficient to cause substantial reductions in herbicide performance at recommended field doses. Resistant (Peldon) and susceptible (Rothamsted) populations also were assessed for resistance to six dinitroaniline herbicides in a petri dish test in which the effects on shoot development were measured. The degree of resistance of the Peldon population varied considerably among herbicides, with greatest resistance to pendimethalin, whereas sensitivity to ethalfluralin, isopropalin, and trifluralin was similar to that of the Rothamsted standard. Differential response to butralin and oryzalin was smaller than to pendimethalin. The large difference between populations in their response to pendimethalin and trifluralin was confirmed in a pot experiment.

Sign in / Sign up

Export Citation Format

Share Document