Combining ability, genotype x environment interactions and genotypic correlations of agronomic characters in Medicago sativa L.

Song, S. P.; Walton, P. D.

doi:10.1007/bf00028216

Cited by 4 publications

(6 citation statements)

References 13 publications

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“…The mean square due to GCA was nearly twofold higher compared to that for SCA, suggesting a relative greater importance of additive effects over nonadditive effects (Table 3). The predominance of GCA in determining forage yield of alfalfa has been reported elsewhere (Tysdal and Kiesselbach, 1944; Song and Walton, 1975; Hill, 1983; Segovia‐Lerma et al, 2004). In studies where significant SCA was detected, its mean square ranged from 33‐fold less to threefold greater than GCA (Busbice and Rawlings, 1974; Song and Walton, 1975; Riday and Brummer, 2002; Segovia‐Lerma et al, 2004).…”

Section: Resultssupporting

confidence: 60%

Combining Abilities and Heterosis for Forage Yield among High‐Yielding Accessions of the Alfalfa Core Collection

et al. 2007

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Characterization of genetic parameters in plant germplasm repository populations can facilitate their utilization in commercial breeding programs. This study investigated genetic combining abilities and heterosis for forage yield among diallel hybrids derived from nine previously selected high‐yielding accessions of the USDA‐ARS National Plant Germplasm System core collection of alfalfa (Medicago sativa subsp. sativa L.). These accessions originated from Turkey, South Africa, Greece, Afghanistan, Israel, Uzbekistan, Mexico, Morocco, and the USA. Forage yield response of the parents and their hybrids was determined near Las Cruces, New Mexico. General combining ability (GCA) and specific combining ability (SCA) effects were significant. The magnitudes of the GCA effects were about 5% (<0.71 Mg ha−1) relative to the mean yield of the parents (15.4 Mg ha−1). The Turkey, Afghanistan, and Uzbekistan accessions demonstrated significant positive GCA effects. Accessions from Greece and Morocco demonstrated negative GCA effects. Six hybrids outperformed the average of six commercial cultivars. Five of these six hybrids demonstrated positive SCA effects. Midparent heterosis ranged from –17 to 17%. The results indicate that crossing between alfalfa populations possessing high per se performance and different fall regrowth responses is likely to produce a higher proportion of high‐yielding hybrids in environments experiencing intermittent subfreezing winter conditions.

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Section: Resultssupporting

confidence: 60%

Combining Abilities and Heterosis for Forage Yield among High‐Yielding Accessions of the Alfalfa Core Collection

et al. 2007

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“…Song and Walton (1975) also showed the occurrence of such interaction for growth habit in lucerne (Medicago sativa L.), as did Berger et al (2002) in Vicia species. It cannot be excluded that the different flower colour frequencies here observed in the two sites were a mere effect of the population sampling.…”

Section: Discussionmentioning

confidence: 60%

Variation in morphology and seed production of snow clover [Trifolium pratense L. subsp. nivale (Koch) Arcang.] germplasm from the Rhaetian Alps, Italy

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et al. 2007

Genet Resour Crop Evol

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A recent approach to restoration of degraded mountain landscapes (e.g. ski slopes) recommend to sow seed mixtures including 'sitespecific' species, i.e. native germplasm adapted to the prevailing conditions and ecologically compatible with the area of intervention. To better exploit the potential of these species and enhance their spread in revegetation projects, deeper knowledge is needed, however, on the existing variation in their germplasm, particularly for economically useful traits such as seed yield. Snow clover is one of the recommended 'site-specific' legumes. This study evaluated 12 populations of snow clover, collected in three valleys of the Rhaetian Alps, Italy, to assess their variation and highlight any promising material. The evaluation encompassed a mountain and a lowland site, to verify the behaviour of the germplasm also in one environment markedly different from that of origin. Differences among valleys were observed for flower colour, growth habit and type, flowering time and susceptibility to mildew, although the overall pattern of phenotypic diversity was similar among valleys. Some effect of the evaluation site on the expression of morphological and seed production traits, and on the overall diversity, was also evident. Furthermore, the lowland site experienced very high plant mortality towards the end of the first growing season. Individual populations proved a valuable source of variation for seed production. Some populations, in particular, were worth of attention for a possible selection of high-seed-yielding snow clover cultivars. An assessment of the mating system suggested a lack of self-tripping or an almost absolute self-incompatibility in snow clover.

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“…In our study, this ratio was 5.6. The preponderance of GCA in determining alfalfa forage yield has been reported elsewhere (Tysdal and Kiesselbach, 1944;Song and Walton, 1975;Hill, 1983, Segovia-Lerma et al, 2004. In studies where signifi cant SCA was detected, its mean square ranged from 33-fold less to 3-fold greater than GCA (Busbice and Rawlings, 1974;Song and Walton, 1975;Riday and Brummer, 2002;Segovia-Lerma et al, 2004;Bhandari et al, 2007).…”

Section: Genetic Components Of Variationmentioning

confidence: 60%

“…Variation attributed to the diallel hybrids refl ected that their average performance tended to exceed that of the parents and that diff erences for GCA and SCA were present. The preponderance of GCA in determining alfalfa forage yield has been reported elsewhere (Tysdal and Kiesselbach, 1944;Song and Walton, 1975;Hill, 1983, Segovia-Lerma et al, 2004. Autotetraploid SCA estimates, however, contain a much greater proportion of the dominance variance affi liated with diallelic, triallelic, and tetra-allelic eff ects and their interactions.…”

Section: Genetic Components Of Variationmentioning

confidence: 74%

“…In autotetraploids, both additive and dominance variance can contribute to GCA eff ects, because two alleles are transmitted through parental gametes to off spring (Levings and Dudley, 1963). In studies where signifi cant SCA was detected, its mean square ranged from 33-fold less to 3-fold greater than GCA (Busbice and Rawlings, 1974;Song and Walton, 1975;Riday and Brummer, 2002;Segovia-Lerma et al, 2004;Bhandari et al, 2007). Thus, the relative importance of additive eff ects and dominance-epistatic eff ects infl uencing a trait of interest can be approximated on the basis of a ratio of GCA/SCA variance.…”

Section: Genetic Components Of Variationmentioning

confidence: 99%

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Combining Ability and Heterosis for Forage Yield among Elite Alfalfa Core Collection Accessions with Different Fall Dormancy Responses

et al. 2010

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Understanding genetic parameters of populations that are being considered for inclusion into plant‐breeding programs provides critical knowledge to enhance economic traits of interest. The objective of this study was to determine the genetic parameters influencing forage yield for nine populations selected from the USDA National Plant Germplasm System alfalfa (Medicago sativa L.) core collection that possessed high‐yield potential and differing fall dormancy response. Forage dry matter yields of 36 diallel hybrids, their 9 parents, and 6 commercial checks were harvested three times in each of 2 yr from seeded plots near Las Cruces, NM. Variation among hybrids for forage yield was primarily attributed to general combining ability effects, which were 5.6 times greater than specific combining ability effects. More than 70% of the hybrids performed similarly to the best commercial check. Fourteen hybrids exhibited significant mid‐parent heterosis (MPH), and seven hybrids exhibited significant high‐parent heterosis (HPH). The frequency of hybrids showing significant MPH was twofold greater for hybrids generated between parents with different fall dormancy response as compared with hybrids generated from parents with similar fall dormancy response. Eight of the nine top‐yielding hybrids were derived from populations that originated from Peru and Argentina. All hybrids with significant positive HPH involved a population from South America.

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Combining ability, genotype x environment interactions and genotypic correlations of agronomic characters in Medicago sativa L.

Cited by 4 publications

References 13 publications

Combining Abilities and Heterosis for Forage Yield among High‐Yielding Accessions of the Alfalfa Core Collection

Combining Abilities and Heterosis for Forage Yield among High‐Yielding Accessions of the Alfalfa Core Collection

Variation in morphology and seed production of snow clover [Trifolium pratense L. subsp. nivale (Koch) Arcang.] germplasm from the Rhaetian Alps, Italy

Combining Ability and Heterosis for Forage Yield among Elite Alfalfa Core Collection Accessions with Different Fall Dormancy Responses

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