A diallel analysis of heterosis in elite hybrid rice based on RFLPs and microsatellites

Zhang, Qifa; Gao, Yongwen; Yang, Siqi; Ragab, R.; Maroof, M. A. Saghai; Li, Z. B.

doi:10.1007/bf00225139

Cited by 155 publications

(107 citation statements)

References 28 publications

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“…For binary traits, such as those frequently used in human disease case-control studies, more complex genetic models, including dominance and overdominance, can be explicitly tested (39,40). Although this is rarely done in the analysis of continuous traits, a few studies have reported associations of heterotic traits with heterozygosity (41)(42)(43)(44)(45). We selected two linear mixed models to search for associations between genotype and phenotype using FaSTLMM software in the easyGWAS framework (46,47).…”

Section: Resultsmentioning

confidence: 99%

Genetic architecture of nonadditive inheritance inArabidopsis thalianahybrids

Seymour

Chae

Grimm

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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The ubiquity of nonparental hybrid phenotypes, such as hybrid vigor and hybrid inferiority, has interested biologists for over a century and is of considerable agricultural importance. Although examples of both phenomena have been subject to intense investigation, no general model for the molecular basis of nonadditive genetic variance has emerged, and prediction of hybrid phenotypes from parental information continues to be a challenge. Here we explore the genetics of hybrid phenotype in 435 Arabidopsis thaliana individuals derived from intercrosses of 30 parents in a half diallel mating scheme. We find that nonadditive genetic effects are a major component of genetic variation in this population and that the genetic basis of hybrid phenotype can be mapped using genome-wide association (GWA) techniques. Significant loci together can explain as much as 20% of phenotypic variation in the surveyed population and include examples that have both classical dominant and overdominant effects. One candidate region inherited dominantly in the half diallel contains the gene for the MADS-box transcription factor AGAMOUS-LIKE 50 (AGL50), which we show directly to alter flowering time in the predicted manner. Our study not only illustrates the promise of GWA approaches to dissect the genetic architecture underpinning hybrid performance but also demonstrates the contribution of classical dominance to genetic variance.T he often observed phenotypic superiority of progeny relative to their parents, or heterosis, is a universal phenomenon and of great importance to plant agriculture. The earliest description of heterosis (also known as hybrid vigor or superiority) dates to Darwin's studies of cross-fertilization in plants. He noticed that intercrossing distantly related individuals gave rise to larger, more vigorous progeny (1). Four decades later, George Shull coined the term "heterosis" (2) for this phenomenon, which he and Edward East had independently described for hybrids of inbred maize in 1908 (3, 4). Heterosis has long been of interest to evolutionary biologists as a potential explanation for the ubiquity of cross-fertilization in plants and animals, but it is also a central component of agricultural breeding programs. The combination of hybrid seed technology and inbred line improvement has driven an unprecedented improvement in maize yield over the past century (5). Despite the economic importance of heterosis and its intensive investigation in a wide spectrum of species, prediction of hybrid performance from parental information remains a major challenge (6).In the terms of quantitative genetics, hybrid vigor (and its opposite, inferiority) describes a deviation of progeny from the phenotypic mean of the parents. This means that heterosis cannot be explained by the addition of the effects of contributing alleles (7). Nonadditive genetic variance can result from a nonlinear phenotypic effect of alleles at one locus, as in the case of dominant/recessive allele pairs in classical genetics, or from epistatic interactions ...

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Section: Resultsmentioning

confidence: 99%

Genetic architecture of nonadditive inheritance inArabidopsis thalianahybrids

Seymour

Chae

Grimm

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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“…Thus, despite the morphological distance detected between genotypes, it is possible that at the molecular and pedigree levels, the differences have not been properly assessed, requiring a sampling that includes genotypes with larger phenotypic differences. This hypothesis was considered in rice, for which signifi cant differences were found only between molecular (RFLP) distances and the performance of grain yield, while hybrids were established with parents of high genetic divergence, i.e., indica x japonica crosses (Zhang et al, 1994).…”

Section: Resultsmentioning

confidence: 99%

Morphological, pedigree, and molecular distances and their association with hybrid wheat performance

Bertan

Carvalho

Oliveira

et al. 2009

Pesq. agropec. bras.

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-The objectives of this work were to estimate the genetic distance among wheat genotypes using morphological, pedigree, molecular, and combined morphological and molecular measures, to determine the correlations between these measures, and to evaluate the combining ability of the genotypes. Three generations and two planting designs were studied. Six wheat genotypes were crossed using a diallel design. The F 1 , F 2 and F 3 generations were evaluated in the fi eld, in the crop seasons of 2003, 2004 and 2005, under spaced plant and full-row planting designs. The estimated general and specifi c combining abilities of tested hybrids were infl uenced both by the generation and the planting design. The correlation coeffi cients among the distance measures and between these measures and genotype performances of different generations for the two planting designs were low to moderate. In order to obtain a more precise estimate of the genetic distance among cultivars and its association with the hybrid performance, more than one generation, planting design, and genetic distance estimation technique should be employed.Index terms: Triticum aestivum, combining ability, genetic variability, parental selection. Distâncias morfológicas, genealógicas e moleculares e suas associações com o desempenho de híbridos em trigoResumo -O objetivo deste trabalho foi estimar a distância genética entre genótipos de trigo, por meio de dados morfológicos, genealógicos, marcadores moleculares AFLP ("amplifi ed fragment length polymorphism"), usados individualmente ou simultaneamente, e calcular a correlação entre essas medidas de distância e a capacidade de combinação dos genótipos. Foram estudadas três gerações e dois sistemas de semeadura. Seis genótipos de trigo foram cruzados de forma dialélica. Os híbridos F 1 e as populações F 2 e F 3 foram avaliados em campo, nos anos agrícolas de 2003, 2004 e 2005, com os esquemas de semeadura de planta espaçada e em linha cheia. As capacidades gerais e específi cas de combinação dos híbridos testados foram infl uenciadas tanto pela geração quanto pelo esquema de semeadura. Os coefi cientes de correlação foram de baixo a moderado entre as medidas de distância e entre estas e o desempenho dos genótipos, nos dois esquemas de semeadura. Para a obtenção de uma estimativa fi el da distância genética entre cultivares e da sua associação com o desempenho dos híbridos, devem ser empregados mais de uma geração, sistema de semeadura e técnica de estimativa da distância genética.Termos para indexação: Triticum aestivum, capacidade de combinação, variabilidade genética, seleção de genitores.

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“…Crosses NERICA 15 × NERICA 2, NERICA 1 × NERICA 15, NERICA 11 × NERICA 15 and NERICA 2 × NERICA 15 were top ranked for one or more drought tolerant trait(s) and yield components. All these crosses had either or shared one of the good parent combiner with drought tolerance traits signifying that these crosses will eventually yield desirable transgressive segregants (Zhang et al, 1994;Li et al, 2002;Alam et al, 2004). …”

Section: Discussionmentioning

confidence: 99%

Combining Ability for Drought Tolerance in Upland Rice Varieties at Reproductive Stage

Malemba¹,

Nzuve²,

Kimani³

et al. 2017

JAS

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Rice is an important food crop for human population ranking second among the mostly consumed cereal grains worldwide. Upland rice production is greatly constrained by drought stress resulting from rainfall variation patterns. Cultivation of drought tolerant varieties is considered the best option for drought management in rice production. The already released upland rice varieties are drought susceptible and have poor grain attributes hence, the aim of this study was to determine the combining ability for drought tolerance in upland rice. Four upland NERICA and two upland rice varieties were selected as parents for generating F 1 s crosses following 6 × 6 complete diallel. The generated 30 F 1 crosses were advanced to F 2 population for field evaluation. The F 2 progenies together with six parents were planted in two sites; KALRO-Mwea Center Farm and Kirogo research Farm following a randomized complete block design in three replications. Drought stress was initiated 45 days after sowing after which data was collected on drought and agronomic parameters. The study revealed large genetic variations among the genotypes used. Both GCA and SCA were significant indicating the importance of both additive and non additive gene action in the expression of studied traits. In this study NERICA 2 and NERICA 15 were identified as good combiners for drought tolerance and grain yield under drought conditions. The single crosses namely; NERICA 15 × NERICA 2, NERICA 1 × NERICA 15, NERICA 11 × NERICA 15 and NERICA 2 × NERICA 15 were identified as superior for improving yield under drought conditions.

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A diallel analysis of heterosis in elite hybrid rice based on RFLPs and microsatellites

Cited by 155 publications

References 28 publications

Genetic architecture of nonadditive inheritance inArabidopsis thalianahybrids

Genetic architecture of nonadditive inheritance inArabidopsis thalianahybrids

Morphological, pedigree, and molecular distances and their association with hybrid wheat performance

Combining Ability for Drought Tolerance in Upland Rice Varieties at Reproductive Stage

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