Partial diallel analysis of agronomic characters in rice (Oryza sativa L.)

Torres, Edgar; Geraldi, Isaias Olívio

doi:10.1590/s1415-47572007000400018

Cited by 23 publications

(22 citation statements)

References 9 publications

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“…The source common bean (Kurek et al, 2001;Nienhuis and Singh, 1988). Similar results were found in other species as rice (Oryza sativa L.), in which the additive genetic effects prevailed over those of dominance for yield related traits (Torres and Geraldi, 2007). The prevalence of dominance effects for grain yield, resulting in hybrids with higher yields than that of the best parent, can be due to a divergent selection carried out for grain yield and erect plant architecture between the parents of the two groups of this study.…”

Section: General and Specific Combining Abilitysupporting

confidence: 55%

Genetic potential of common bean parents for plant architecture improvement

Silva¹,

Carneiro²,

Júnior³

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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In common bean (Phaseolus vulgaris L.) breeding, plant selection that associate erect plant architecture, high yield, and grains with good commercial acceptance has been the choice of breeders. Thus, this study aimed to evaluate potential parents, to obtain promising segregating populations that associate high yield, erect plant architecture and carioca grain type, as well as to obtain information on heterosis, general and specific combining ability of these parents regarding grain yield and traits related to plant architecture. Fourteen common bean lines were crossed under a partial diallel scheme. Group 1 was composed by eight erect plant lines and group 2 by six carioca grain type lines. The F 1 's plants from the crosses and the 14 parents were evaluated during spring (Mar. sowing) for plant architecture grade, diameter of the hipocotyl, plant mean height, and grain yield. Predominance of additive effects was observed for plant architecture grade and diameter of the hypocotyls. For grain yield and plant mean height, there was a greater contribution of the dominance effects. Thus, selection of erect plants, with a larger diameter of the hypocotyl can be carried out in early generations; while for grain yield and plant mean height, it must be delayed, preferably, to later generations.

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Section: General and Specific Combining Abilitysupporting

confidence: 55%

Genetic potential of common bean parents for plant architecture improvement

Silva¹,

Carneiro²,

Júnior³

et al. 2013

Sci. agric. (Piracicaba, Braz.)

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“…The effects of heterosis emphasize the importance of nonadditive gene effects or the importance of intra-allelic interactions in conditioning a trait. Similar results were observed in other studies with the rice crop (Torres and Geraldi, 2007;Pereira et al, 2008). Estimates of type B genetic correlation between locations for genotypes mean, general (GCA 1 and GCA 2 ) and specific combining ability (SCA), and estimates of contrast involving means of groups 1 (d 1 ) and 2 (d 2 ) and the overall average in two locations (Goianira and Teresina) and in combined locations for grain yield (GY), plant height (PH), and days to flowering (DTF).…”

Section: Gene Action and Combining Abilitysupporting

confidence: 92%

“…For GY, most of the ˆi i s effects showed a significant positive sign, averaging 392.11 in Goianira and 335.55 in Teresina, suggesting the manifestation of negative mean heterosis in crosses (Fig. For DTF, this effect was not only desirable but expected, because the crosses are generally earlier in flowering than the parents (Verma and Srivastava, 2004;Torres and Geraldi, 2007) due to negative heterosis (Kawakata and Yajima, 1995). For DTF, most of the ˆi i s effects were positive and significant, averaging 4.40 in Goianira and 4.22 in Teresina (Fig.…”

Section: Gene Action and Combining Abilitymentioning

confidence: 96%

Gene Action and Combining Ability for Certain Agronomic Traits in Red Rice Lines and Commercial Cultivars

et al. 2017

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1295RESEARCH P roduction and consumption of white rice (Oryza sativa L.) are prevalent in the world, although the original pigmentation of the pericarp of all rice species is red. The white pericarp, a colorless phenotype, is determined by the rc allele that originated from a loss-of-function mutation at the Rc locus on chromosome 7 in Oryza rufipogon Griffiths-a wild relative of cultivated rice. The red coloration, in turn, is determined by the complementary effect of two genes, Rc and Rd, each one inherited monogenically. The original dominant allele (Rc) interacts with the Rd allele on chromosome 1 to synthesize the proanthocyanidin compound that determines red pericarp pigmentation in rice grains. Specifically, the Rc allele that encodes the basic helix-loop-helix (bHLH) protein is responsible for the accumulation of pigments in the pericarp of brown-colored grains, whereas the Rd allele that encodes the dihydroflavonol-4-reductase (DFR) enzyme is required to increase the content of the pigment, resulting in redcolored grains (Nagao et al., 1957;Furukawa et al., 2007).ABSTRACT Cultivated red rice (Oryza sativa L.) is the most important special type of rice in Brazil and makes an excellent food, mainly because of its nutritional value. Genetic variability, useful for rice breeding programs, exists among red rice accessions. The objectives of the present study were: (i) to determine the nature of gene action and magnitude of genetic components conditioning grain yield (GY), plant height (PH), and days to flowering (DTF); and (ii) to determine the combining ability for these traits in nine red rice lines (female parents) and four commercial cultivars (male parents). Thirteen parents, an F 2 generation of 18 crosses, and a check cultivar were evaluated at two locations (Goianira and Teresina, Brazil) using a randomized complete block design with four replications. Data (unbalanced because of lost plots) from this incomplete set of crosses in a factorial mating design were subjected to variance analyses using a general linear model. According to Baker's ratio, nonadditive genetic effects were more important than additive effects for the expression of the three traits. The dominance deviations were predominantly negative for GY and DTF and were positive for PH.

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“…Earlier stem elongation in floating rice can greatly improve the chance of floating rice to survive in the flood, and therefore a set of 6 × 6 half-diallel crosses with four floating and two non-floating rice varieties was developed with results indicating that the additive effect was higher than dominant effects and the dominant alleles were concentrated in the floating parental lines49. A partial diallel based on six indica and seven japonica rice genotypes was used to investigate the genetic variations of yield and cold tolerance, with significant heterosis and combining ability revealed for tested characters50.…”

Section: Multiple-hybrid Populations (Mhp) For Gwasmentioning

confidence: 99%

Development of a multiple-hybrid population for genome-wide association studies: theoretical consideration and genetic mapping of flowering traits in maize

Wang

Liu

et al. 2017

Sci Rep

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Various types of populations have been used in genetics, genomics and crop improvement, including bi- and multi-parental populations and natural ones. The latter has been widely used in genome-wide association study (GWAS). However, inbred-based GWAS cannot be used to reveal the mechanisms involved in hybrid performance. We developed a novel maize population, multiple-hybrid population (MHP), consisting of 724 hybrids produced using 28 temperate and 23 tropical inbreds. The hybrids can be divided into three subpopulations, two diallels and NC (North Carolina Design) II. Significant genetic differences were identified among parents, hybrids and heterotic groups. A cluster analysis revealed heterotic groups existing in the parental lines and the results showed that MHPs are well suitable for GWAS in hybrid crops. MHP-based GWAS was performed using 55 K SNP array for flowering time traits, days to tassel, days to silk, days to anthesis and anthesis-silking interval. Two independent methods, PEPIS developed for hybrids and TASSEL software designed for inbred line populations, revealed highly consistent results with five overlapping chromosomal regions identified and used for discovery of candidate genes and quantitative trait nucleotides. Our results indicate that MHPs are powerful in GWAS for hybrid-related traits with great potential applications in the molecular breeding era.

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Partial diallel analysis of agronomic characters in rice (Oryza sativa L.)

Cited by 23 publications

References 9 publications

Genetic potential of common bean parents for plant architecture improvement

Genetic potential of common bean parents for plant architecture improvement

Gene Action and Combining Ability for Certain Agronomic Traits in Red Rice Lines and Commercial Cultivars

Development of a multiple-hybrid population for genome-wide association studies: theoretical consideration and genetic mapping of flowering traits in maize

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