Genetic Diversity, Specific Combining Ability, and Heterosis in Tropical Maize under Stress and Nonstress Environments

Betrán, F. J.; Ribaut, Jean-Marcel; Beck, David L.; León, Diego González De

doi:10.2135/cropsci2003.7970

Cited by 184 publications

(132 citation statements)

References 30 publications

(35 reference statements)

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“…This has been observed in many previous studies (Godshalk et al 1990;Melchinger et al 1990;Reif et al 2003;Dhliwayo et al 2009;Menkir et al 2010;Badu-Apraku et al 2013) where the predictive ability of markers on performance is generally good only with very closely related lines, where heterosis is likely to be quite low in general. These results are in contrast to Betrán et al (2003b) and Wegary et al (2013) who reported significant correlation between genetic distance and grain yield. The poor correlation between GD and hybrid performance could be attributed to lack of linkage between the SNP markers used to estimate GD and quantitative trait loci for grain yield (Bernardo 1992).…”

Section: Discussioncontrasting

confidence: 99%

Genetic analysis of tropical quality protein maize (Zea mays L.) germplasm

et al. 2017

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Maize (Zea mays L.) is an important source of carbohydrates and protein in the diet in sub-Saharan Africa. The objectives of this study were to (i) estimate general (GCA) and specific combining abilities (SCA) of 13 new quality protein maize (QPM) lines in a diallel under stress and non-stress conditions, (ii) compare observed and predicted performance of QPM hybrids, (iii) characterize genetic diversity among the 13 QPM lines using single nucleotide polymorphism (SNP) markers and assess the relationship between genetic distance and hybrid performance, and (iv) assess diversity and population structure in 116 new QPM inbred lines as compared to eight older tropical QPM lines and 15 non-QPM lines. The GCA and SCA effects were significant for most traits under optimal conditions, indicating that both additive and non-additive genetic effects were important for inheritance of the traits. Additive genetic effects appeared to govern inheritance of most traits under optimal conditions and across environments. Non-additive genetic effects were more important for inheritance of grain yield but additive effects controlled most agronomic traits under drought stress conditions. Inbred lines CKL08056, CKL07292, and CKL07001 had desirable GCA effects for grain yield across drought stress and non-stress conditions. Prediction efficiency for grain yield was highest under optimal conditions. The classification of 139 inbred lines with 95 SNPs generated six clusters, four of which contained 10 or fewer lines, and 16 lines of mixed co-ancestry. There was good agreement between Neighbor Joining dendrogram and Structure classification. The QPM lines used in the diallel were nearly uniformly spread throughout the dendrogram. There was no relationship between genetic distance and grain yield in either the optimal or stressed environments in this study. The genetic diversity in mid-altitude maize germplasm is ample, and the addition of the QPM germplasm did not increase it measurably.

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Section: Discussioncontrasting

confidence: 99%

Genetic analysis of tropical quality protein maize (Zea mays L.) germplasm

et al. 2017

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“…Betrán et al (2003) reported a highly significant correlation between GD and SCA effects (r = 0.8) in maize under stress and non-stress conditions. Devi and Singh (2011) demonstrated that SCA could emerge as an important factor in the determination of heterosis and per se performance of the hybrids.…”

Section: Introductionmentioning

confidence: 94%

“…Cress (1966) proposed that the extent of GD between parents is necessary for significant heterosis but is not sufficient to guarantee it. Betrán et al (2003) suggested that heterosis can be better predicted only when GD is smaller than a certain threshold. Moreover, studies have suggested that the correlation is dependent on the investigated germplasm and GD calculation methods (Melchinger et al 1990;Tams et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Combining ability, heterosis, genetic distance and their intercorrelations for waterlogging tolerance traits in chrysanthemum

Zhang

Yang

et al. 2017

Euphytica

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Waterlogging tolerance (WT) is a major objective in chrysanthemum breeding programs, and although certain genotypes with different tolerance levels have been identified, their value as parents for WT breeding is unknown. Here, twelve F 1 crosses derived from an incomplete diallel mating scheme were conducted to investigate combining ability and heterosis for WT and their relationships with parental genetic distance. The results showed that the membership function value of waterlogging (MFVW) was controlled by additive and non-additive gene effects, whereas other growth and biomass traits were mainly controlled by non-additive gene effects. The estimated broad and narrow sense heritabilities of the MFVW were 97.5 and 51.5%, respectively. Combining ability analyses indicated that 'Nannong Xuefeng' showing the largest general combining ability (GCA) effect for the MFVW was the best combiner, and identified several best cross combinations with high positive specific combining ability (SCA) effects for most WT-related traits. Mid-and high-parent heterosis occurred widely. The three distance measures, based on phenotypic traits (PD), molecular markers (GD) and markers linked with quantitative trait loci (QTL-GD), presented a nonsignificant correlation with combining ability except for the GD with GCA for the relative root fresh weight. The correlations between the QTL-GD and heterosis were significant for certain traits and generally higher than that of the PD or GD and heterosis. The SCA effects were positively correlated with heterosis for most of the WT traits (0.51 B r B 0.80). The findings benefit understanding the inheritance mode and then achieving desirable improvement for WT in chrysanthemum.

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“…Alguns estudos em diversas espécies têm revelado uma significativa correlação entre distâncias genéticas por marcadores moleculares e expressão da heterose, como em Brassica napus L. (Riaz et al, 2008) e em milho (Betrán et al, 2003). No entanto, em outros estudos têm sido encontradas baixas correlações, como em milho (AjmoneMarsan et al, 1998;Bechimol et al, 2000), em arroz japonica (Kwon et al, 2002), em trigo (Martin et al, 1995;Lorencetti et al, 2006) e em girassol (Cheres et al, 2000).…”

Section: Introductionunclassified

Heterose e distâncias genéticas moleculares para a produção de grãos em soja

2010

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ResumoEm soja, tem sido relatada a ocorrência de heterose para a produção de grãos, e embora a utilização de cultivares híbridas não seja ainda uma realidade nesta espécie, o conhecimento da heterose é importante para uma pré-seleção de cruzamentos, visto que cruzamentos mais heteróticos estão associados a uma maior divergência entre os genitores. Entretanto, a obtenção de sementes F 1 em quantidade suficiente para a avaliação experimental em parcelas é muito difícil e, assim, outros indicadores da ocorrência da heterose poderiam ser muito úteis. Objetivou-se, neste trabalho a avaliação da heterose para a produção de grãos em soja e as suas relações com as distâncias genéticas (DG), obtidas com o marcador molecular AFLP. Seis híbridos F 1 oriundos de cruzamentos com diferentes distâncias genéticas (DG) e os respectivos genitores foram avaliados em experimentos com quatro repetições, empregando o delineamento em blocos ao acaso. Foi observada uma grande variação entre os cruzamentos quanto às heteroses, isso é, de 6,29 a 56,50% em relação à média dos genitores ( mg h ) e de -0,34 a 51,30% em relação ao genitor superior ( gs h ). As correlações entre as distâncias genéticas (DG) e as heteroses foram elevadas (r = 0,83 e 0,60, respectivamente, para mg h e gs h ), indicando que as distâncias genéticas podem ser utilizadas como indicativas de cruzamentos mais divergentes e, consequentemente, como um dos auxiliares na seleção de genitores mais divergentes em soja. Termos para indexação:Glycine max, heterose, distância genética, marcadores AFLP. AbstractHeterosis has been reported for grain yield in soybeans, and despite the fact that hybrid cultivars have not been used yet, the knowledge of heterosis magnitude is very important for a previous selection of crosses, since heterosis is related to parental divergence. However, the obtention of enough F 1 seeds for experimental evaluation in plots is a time-consuming task, and thus, other indicators of the occurrence of heterosis could be very useful. The objective of this work was to evaluate heterosis and its relationship with AFLP molecular genetic distance (DG). Six F 1 hybrids, derived from parents with different levels of genetic distances (DG) and their respective parents, were evaluated in completely randomized block designs, with four replications. Heterosis estimates were very different among different crosses, varying from 6.29 to 56.50% for mid-parent heterosis ( mg h ) and from -0.34 to 51.30% for high-parent heterosis ( gs h ). Besides, the correlation between heterosis and genetic distances (DG) were very high (0.83 and 0.60, respectively, for mg h and gs h ), which indicates that DG can be used as indicative of more divergent crosses, and thus, as one criterion for selection of more divergent parents.

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Genetic Diversity, Specific Combining Ability, and Heterosis in Tropical Maize under Stress and Nonstress Environments

Cited by 184 publications

References 30 publications

Genetic analysis of tropical quality protein maize (Zea mays L.) germplasm

Genetic analysis of tropical quality protein maize (Zea mays L.) germplasm

Combining ability, heterosis, genetic distance and their intercorrelations for waterlogging tolerance traits in chrysanthemum

Heterose e distâncias genéticas moleculares para a produção de grãos em soja

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