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  • 1
    Electronic Resource
    Electronic Resource
    Repeatability of regression stability indexes for grain yield of oats (Avena sativa L.) (1976)
    Springer
    Euphytica 25 (1976), S. 21-28 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; grain yield ; regression stability index ; repeatability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Two lines of descent were established from an F3 bulk lot of oats (Avena sativa L.) initiated by mixing seeds from approximately 250 crosses. For one line of descent, seeds were radiated with thermal neutrons or X-rays from F3 through F6, followed by five generations of bulk propagation. The second was propagated for 10 generations. No artificial selection was practiced in either line of descent. Grain yield data from 20 random strains from each of four generations from the radiated (F7, F8, F9, and F11) and five from the nonradiated (F3, F6, F7, F8, and F12) line of descent and 20 check cultivars tested in 14 environments were used for estimating regression stability indexes of oat strains. The 14 environments were assigned randomly to two sets of seven, and regression stability indexes were computed for the 180 experimental oat strains for both sets. Intrageneration correlations between regression stability indexes from the two sets of environments ranged from −0.35 to 0.64 (18 d.f.), and only one of nine was significant, indicating poor repeatability for estimates of this statistic computed from different sets of environments. Correlations between regression stability indexes from two sets of environments, one in which the environments varied by soil nitrogen levels and a second in which they varied by soil phosphorus levels, ranged from −0.01 to 0.28, none of which was significant. The relative magnitudes and ranking of the regression stability index values for the oat genotypes were nearly identical when environmental productivity indexes were assessed with any number of check cultivars from 2 to 20.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041525
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  • 2
    Electronic Resource
    Electronic Resource
    Grain yield response and stability for oat lines with low-, medium-, and high-yielding ability (1987)
    Springer
    Euphytica 36 (1987), S. 121-127 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; grain yield ; yield response ; yield stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Relationships that exist among grain yielding ability and response and stability of grain yields when tested over variable environments were examined. Two sets of oats lines were tested over many environments that had wide ranges in productivities. The lines in each set were divided into high-, medium-, and low-yielding groups on the basis of means across all environments, and variance components for genotype × environment interactions and means of regression responses and coefficients of determination were computed for the three yield categories in each set. Mean grain yields for the high-, medium-, and low-yielding groups across both sets of oats lines were 2.7, 2.3, and 1.9 Mg ha-1, respectively. Coefficients of variability for the genotype × environment interaction were 18%, 16%, and 12% for the high-, medium-, and low-yielding categories, respectively. Means for regression responses were 1.22 for the high group, 0.99 for the medium, and 0.78 for the low. Most responses for the high and low groups were significantly different from 1.0. Means for coefficients of contingency were 0.63, 0.56, and 0.51 for the high-, medium-, and lowyielding groups, respectively. There was a positive relationship between mean grain yield and response of grain yield to improving environments. Thus, high yielding lines are also the responsive lines. Our study gave conflicting results about stability of production for the three yield groups. Coefficients of variation for genotype × environment interaction indicated that the high-yielding group was more interactive with environments than were the medium- and low-yielding ones: However, the means for coefficients of contingency indicated that the high yielding group was the most stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730655
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between genealogical distance and breeding behaviour in oats (Avena sativa L.) (1987)
    Springer
    Euphytica 36 (1987), S. 413-424 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; genetical distance ; breeding behaviour ; coefficient of kinship
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Eight oat cultivars and experimental lines from four germplasm sources were crossed in a diallel mating design without reciprocals. F1 heterosis for grain yield was evaluated in two experiments, and 48 F2-derived lines from each of the 28 matings were evaluated for bundle weight, grain yield, straw yield, harvest index, height, and heading date in two experiments. Number of transgressive segregates per trait and generalized genetic variance were calculated for each mating. Genealogical distance for each mating was obtained by using coefficient of kinship based on the pedigree of the parents. The relationship between genealogical distance and the three types of breeding behaviour was examined via correlation and regression. Significant correlations occurred only for genealogical distance with numbers of transgressive segregates for height and with generalized genetic variances. Both were positive. Significant heterosis was observed for matings of more distantly related parents. Regressions on genealogical distance, when significant, were linear. Genealogical distance between parents was positive associated with diversity on the basis of breeding behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00041484
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  • 4
    Electronic Resource
    Electronic Resource
    Direct and indirect selection for grain yield in oats (avena sativa L.) (1983)
    Springer
    Euphytica 32 (1983), S. 407-413 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; grain yield ; direct selection for yield ; indirect selection for yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Direct and indirect selection for increased grain yield were carried out on a population of 678 F2-derived lines of oats. A selection intensity of 10% was used with direct selection (selection for grain yield itself) and with indirect selection using three criteria, harvest index, vegetative growth rate, and the index of harvest index + vegetative growth rate. Expected gains from 1978 evaluations were compared to actual gains measured in 1980. Actual grain yield increases were 4, 8, 7, and 6% from selection via harvest index, vegetative growth rate, grain yield, and harvest index + vegetative growth rate, respectively. Thus, indirect selection via vegetative growth rate gave a greater increase in grain yield than did direct selection. Heritability values computed via components of variance ranged from 0.50 to0.57 for the three traits, harvest index, vegetative growth rate, and grain yield, whereas regression heritabilities ranged from 0.41 to 0.55. Realized heritabilities were 0.33, 1.00 and 0.89 for the three traits, respectively. Selection via all criteria caused significant changes in nearly all agronomic traits except weight per volume. Vegetative growth rate, which gave the greatest gain in grain yield, caused less drastic changes in days to anthesis, plant height, biological yield, and vegetative yield than did direct selection for grain yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021449
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  • 5
    Electronic Resource
    Electronic Resource
    Increasing grain yield of oats by independent culling for harvest index and vegetative growth index or unit straw weight (1985)
    Springer
    Euphytica 34 (1985), S. 33-41 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; selection ; independent culling ; harvest index ; vegetative growth index ; unit straw weight ; biological yield ; growth rate ; heritability ; genotypic correlatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Most variation in grain yield of oats is due to variation in harvest index and vegetative growth index, but the latter traits are negatively associated. Therefore we used independent culling levels to select oat genotypes with high levels of vigor traits and a desirable level of harvest index in an attempts to maximize grain yield. Harvest index and vegetative growth index or harvest index and unit straw weight were selected at various culling levels. Intensive selection for harvest index resulted in high harvest index but no grain yield improvement, because the selected lines had poor vigor. Intensive selection for vegetative growth index or unit straw weight resulted in high biomass but low harvest index. The most effective combination of culling levels was to select 25% of the original population for harvest index and, subsequently, to select for vegetative growth index or unit straw weight at an 8% intensity in the remnant population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022861
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  • 6
    Electronic Resource
    Electronic Resource
    Inheritance of groat-oil content and high-oil selection in oats (Avena sativa L.) (1985)
    Springer
    Euphytica 34 (1985), S. 251-263 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; groat-oil content ; high-oil selection ; lipids ; gene action ; transgressive segregation ; recurrent selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The potential for breeding for high groat-oil content in oats was investigated by (a) conducting generation means analyses on data from three matings among adapted Avena sativa L. cultivars, (b) practicing one cycle of phenotypic recurrent selection in a segregating population derived from eight species backcrosses (Avena sativa x (A. sativa x A. sterilis)) among 24 parents, and (c) identifying transgressive segregates from interspecific (A. sativa x A. sterilis) matings. Additive gene action was the most important component in explaining the variation among generation means for groat-oil content. Dominance and epistatic interactions involving dominance were not significant in any mating. Significant residual genetic variation occurred in one mating, even after additive, dominance, and three digenic interactions were fitted. The importance of additive genes action implies that desired allelic combinations for high groat-oil content can be obtained in pure-line cultivars. One cycle of phenotypic recurrent selection using single plants as the selection units resulted in a genetic gain of 1.7 to 2.1% in groat-oil content. Individual plants selected for initiating the second cycle had from 9.5 to 12.6% groat oil. Over all 12 interspecific matings, the F2 progeny means were similar to the midparent values. Only two were significantly deviant. Transgressive segregates for high and low groat-oil content from these matings provided evidence that A. sterilis possesses alleles for high and low groat-oil content that are different from those in the gene pool of cultivated oats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00022917
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  • 7
    Electronic Resource
    Electronic Resource
    Associations between nitrogen harvest index and yield characteristics of oats (1990)
    Springer
    Euphytica 47 (1990), S. 1-10 
    Details
    ISSN: 1573-5060
    Keywords: Key words ; Avena sativa ; oats ; adaptability ; yield response ; yield stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fifty lines of oats (Avena Sativa L.) with a broad range of nitrogen harvest indexes (NHI) and nine check lines were evaluated in 15 environments to study the association between NHI and adaptability of oat lines to soils with different productivity levels due primarily to different amounts of N. Three yield characteristics (i.e., mean across environments, regression response to improving environments, and stability of response) were used to measure adaptability. The lines were significantly variable for means of grain and straw yield, for responsiveness to improving environments, and for stability of yield. Among the yield characteristics, only the mean of grain yield was significantly correlated with NHI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040355
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  • 8
    Electronic Resource
    Electronic Resource
    Growth rate inheritance and associations with other traits in backcross populations of Avena sativa x A. sterilis (1977)
    Springer
    Euphytica 26 (1977), S. 309-317 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; Avena sterilis ; interspecific cross ; growth rate ; straw yield ; grain yield ; heading date ; harvest index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Improved grain yields in lines of oats from matings of Avena sativa x A. sterilis were found to be due to increased plant growth rate. Growth rates of oats were quantitatively inherited, with the minimum number of effective factor pairs segregating in the interspecific matings ranging from 3 to 9. Heritability values for this trait averaged 0.4. Growth rate was highly and positively correlated with bundle weight, straw yield, grain yield, and unit straw weight, but it was uncorrelated with heading date and harvest index. Correlations with plant height were low. Thus, it should be possible for oat breeders to combine the high growth rates from A. sterilis with any combination of agronomic traits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026992
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  • 9
    Electronic Resource
    Electronic Resource
    Associations among productivity, production response, and stability indexes in oat varieties (1979)
    Springer
    Euphytica 28 (1979), S. 17-24 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; yield ; production response ; stability index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We tested three sets of oat varieties for grain yield in a series of environments and observed that generally more than 80% of the yield variation for individual varieties was due to linear regression response. Mean yields for varieties were significantly variable in all three sets, and regression response indexes were significantly variable in two of them. Mean yields over the three sets were correlated with regression response indexes with r=0.61. Associations of mean yield with the three stability parameters (i.e., coefficient of determination, mean square for deviations from regression, and ecovalence) were low and usually not significant. The correlation of regression response indexes with coefficients of determination was 0.42, but neither of the other stability parameters was associated with the response indexes. The three stability parameters were closely correlated with one another. Our materials were selected varieties, so evidently our results suggest what can be accomplished in breeding for combinations of mean production, production response, and productiom stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029168
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  • 10
    Electronic Resource
    Electronic Resource
    Selection for grain yield of oats via vegetative growth rates measured at anthesis and maturity (1987)
    Springer
    Euphytica 36 (1987), S. 91-97 
    Details
    ISSN: 1573-5060
    Keywords: Avena sativa ; oats ; selection ; harvest index ; vegetative growth ; straw weight ; biomass ; dry weight ; heading date ; heritability ; actual genetic gain ; genotypic correlation ; correlated response ; selection differential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Grain yield of oats can be improved by increasing either vegetative growth rate or harvest index, but these two traits are negatively associated. Currently, harvest index of oats is near an optimum at 45%, so further improvement in grain yield must come from increased vegetative growth rate. In this study, vegetative growth rate was measured at anthesis and at maturity by dividing vegetative dry weight at anthesis and straw yield, respectively, by days to heading. Genotypic correlations between the two estimates of vegetative growth rate ranged from 0.53 to 0.66. When the highest 10% of the lines were selected for the two growth rate measurements, the actual genetic gain in grain yield was 3.5% when vegetative growth at anthesis was used, and a slight decrease occurred when vegetative growth rate at maturity was used. Selection for either growth rate measurement caused associated increases in biological and straw yields and dry weight at anthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730651
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