A note on relationship between stability variance and ecovalence

1987 ◽  
Vol 78 (2) ◽  
pp. 107-107 ◽  
Author(s):  
M. S. Kang ◽  
J. D. Miller ◽  
L. L. Darrah
Keyword(s):  
Stability Variance

Yield Stability Studies in Soyabeans (Glycine Max)

1980 ◽  
Vol 16 (4) ◽  
pp. 387-392 ◽  
Author(s):  
S. M. Funnah ◽  
C. Mak
Keyword(s):  
Regression Analysis ◽  
Grain Yield ◽  
Relative Yield ◽  
Yield Stability ◽  
Environmental Indices ◽  
Stability Variance ◽  
Stability Classification ◽  
Significant Regression ◽  
The Stability ◽  
Analysis Stability

SUMMARYRegression analysis, stability variance method, and the genotype-grouping technique were used to investigate the relative yield stability of 20 soyabean genotypes, grown in 12 diverse environments in Malaysia in 1978. With the regression analysis, four genotypes were observed to be unstable for grain yield; however, for the remaining 16 genotypes with non-significant regression coefficients, a substantial proportion of the g × e interaction was non-linearly related to the environmental indices. With the second and third methods less than half of the genotypes turned out to be stable for grain yield. Generally, for some genotypes, the stability classification was the same for all three methods.

Comparison of Stability Statistics as Criteria for Cultivar Development in Peanut1

1989 ◽  
Vol 16 (1) ◽  
pp. 21-25 ◽  
Author(s):  
W. F. Anderson ◽  
R. W. Mozingo ◽  
J. C. Wynne
Keyword(s):  
Breeding Line ◽  
Stability Parameters ◽  
Breeding Lines ◽  
Qualitative Traits ◽  
Stability Variance ◽  
Varying Environments ◽  
Variance Parameters ◽  
Highly Correlated ◽  
Using Data ◽  
The Stability

Abstract Means of yield and qualitative traits are assessed in multi-location tests in the final stages of breeding line evaluation. Due to large environmental variation and genotype x environment interactions, it is often desirable to compare stability of lines over a range of environments. The objective of this study was to use various stability parameters to try and determine the stability of experimental breeding lines. Using data from regional advanced peanut (Arachis hypogaea L.) breeding line yield trials conducted over 3 years and four locations in Virginia and North Carolina, the stability of peanut cultivars and breeding lines was compared. Stability variance was found to be highly correlated (0.91–1.00) with covariate adjusted stability variance. In many instances, the stability-variance parameters produced similar results to pairwise regressions and dissimilarity measures when compared with standard cultivars. However, the distance parameters and regressions provided more precise information on relative responses in varying environments of two advanced breeding lines being considered for release. This allowed for direct comparison to cultivars targetted for replacement. NC 18411 had equal mean yields and qualitative traits but better stability than breeding line NC 18423. Regression analysis indicated that NC 18423 performed best in good environments but worse than most other cultivars in poor environments. Means and stability of value per kilogram and value per hectare were highly correlated with percentage of sound mature kernels and yield (0.92–0.99), respectively. A comparison of means and stability parameters was effective in discerning superiority of peanut breeding lines for potential release and use by growers.

scholarly journals RESISTANCE OF SPRING BARLEY VARIETIES BRED BY THE OMSK AGRARIAN SCIENTIFIC CENTER TO STRESS UNDER CONDITIONS OF WESTERN SIBERIA

2020 ◽  
Vol 4 (24) ◽  
pp. 135-142
Author(s):  
P.N. Nikolaev ◽  
◽  
O.A. Yusova ◽  
Keyword(s):  
Western Siberia ◽  
Regression Coefficient ◽  
Climatic Factors ◽  
Spring Barley ◽  
Forest Steppe ◽  
Average Yield ◽  
Scientific Center ◽  
Early Maturity ◽  
Relevant Today ◽  
Stability Variance

Spring barley is a key grain-fodder and fodder crop, which forms an increased yield compared to other grain-fodder crops due to early maturity and drought resistance. Taking into account climatic factors and production demands, breeding for increased productivity and adaptability to local natural and climatic factors, resistance to biotic and abiotic stresses is relevant today. The purpose of the research was to assess the fitness of spring barley varieties (Hordeum sativum L.) bred by the Omsk Agrarian Scientific Center for the conditions of climate transition from continental to sharply continental in Western Siberia. The object of the research: eleven varieties of spring barley, which belong to the multi-row hulled (standard ‘Omskiy 99’), two-row hulled (standard ‘Omskiy 95’), multi-row hulless or “naked” (standard ‘Omskiy golozerny 2’) and two-row hulless (standard ‘Omskiy golozerny 1’). The studies were carried out in the zone of the southern forest-steppe of Western Siberia from 2011 to 2019. The coefficient of linear regression and the stability of the reaction of the yield of varieties were calculated. Under the conditions of the continental and sharply continental climate of Western Siberia, the average yield of spring barley for the period of research was 4.03 t/ha (Lim. = 2.23–5.63 t/ha). The intensive group includes varieties ‘Omskiy golozerny 4’, ‘Sibirskiy Avangard’ and ‘Sasha’ (regression coefficient more than 1). Increased stability of the yield was noted in the varieties ‘Omskiy golozerny 2’, ‘Omskiy golozerny 1’, ‘Sasha’, ‘Omskiy 90’, ‘Omskiy 96’, ‘Omskiy 100’ (stability variance less than 0.29). Varieties ‘Omskiy 96’ and ‘Omskiy 100’ are characterized by full compliance of the formed yield with those agrotechnical conditions in which they are grown at a fairly stable level of productivity formation. The highest average yield over the years of the study was formed by the varieties ‘Sasha’ (4.70 t/ha) with values of plasticity (regression coefficient is equal 1.1) and stability (stability variance is equal 0.18), ‘Omskiy 100’ (4.89 t/ha; 1.02; 0.11, respectively). We recommend them for cultivation in the region.

scholarly journals Ecological adaptability of hybrid (F3-5) populations of alfalfa in terms of fodder and seed productivity in conditions of increased soil acidity

1970 ◽  
pp. 33-46
Author(s):  
V.D. Buhayov ◽  
V.M. Horenskyi
Keyword(s):  
Soil Acidity ◽  
Objective Evaluation ◽  
Seed Productivity ◽  
Hydrothermal Conditions ◽  
Ecological Adaptability ◽  
Stability Variance ◽  
Alfalfa Seed ◽  
Grass Stand ◽  
Growing Conditions ◽  
High Level

Purpose. Estimation of ecological adaptability of hybrid (F3-5) populations of alfalfa for fodder and seed productivity against the background of increased soil acidity in different years of grass stand by determining its components – regression coefficient and stability variance. Methods. Field (conducting phenological observations and accounting), laboratory (accounting for seed productivity), mathematical and statistical (objective evaluation of the obtained experimental data). Results. The research was conducted in 2013-2020 in the fields of the Institute of Feed Research and Agriculture of Podillya of NAAS. 37 hybrid populations of F3-5 created with participation of alfalfa seed samples (Sinyukha (UJ0700134, Ukraine); Regina (UJ0700031, Ukraine); Yaroslavna (UJ0700225, Ukraine); Vika (Denmark); Mega (UJ0700365, Sweden), Grilys (Sweden) and the variable Gidrune (UJ0700699, Lithuania). Assessment of the ecological adaptability of hybrid (F3-5) populations of alfalfa, created on the basis of collection samples (Medicago sativa L., M. varia L.) of different ecological and geographical origin against the background of the increased soil acidity. The obtained values of stability variance confirm the difficulty of selection of alfalfa to increase the level of seed productivity compared to fodder, which are often positively affected by opposite hydrothermal conditions. Conclusions. Based on the results of the assessment of the ecological adaptability of hybrid (F3- 5) populations of alfalfa in conditions of increased soil acidity, the following combinations with a relatively high response to improved growing conditions, characterized by a potentially high level of fodder (Mega / Regina, Vika / Regina, Zhidrune / Regina, Zhidrune / Sinyukha, Mega / Grilys, Yaroslavna / Vika, Yaroslavna / Zhidrune, Grilys / Zhidrune, Vika / Mega) and seed productivity (Regina / Mega, Regina / Zhidrune, Sinyukha / Mega, Sinyukha / Yaroslavna, Sinyukha / Zhidrune, Grilys Mega, Grilys / Regina, Mega / Yaroslavna, Zhidrune / Vika, Mega / Zhidrune) are identified.

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