Identification of AFLP Markers Favorable to Heterosis in Hybrid Rice.

Liu, Xiaochuan; Ishiki, Koshun; Wang, Weixia

doi:10.1270/jsbbs.52.201

Cited by 31 publications

(27 citation statements)

References 16 publications

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“…1 has been proposed as a useful tool for hybrid vigor prediction (Melchinger 1999). Several studies reported a positive correlation between genetic distance of parental lines and superior hybrid performance (Liu et al 2002;Barbosa et al 2003). An alternative approach, pioneered by Stuber et al (1992), aims to identify and characterize the quantitative trait loci (QTL) contributing to heterosis, providing also indications about the genetic basis of the phenomenon.…”

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confidence: 99%

Classical Genetic and Quantitative Trait Loci Analyses of Heterosis in a Maize Hybrid Between Two Elite Inbred Lines

et al. 2007

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The exploitation of heterosis is one of the most outstanding advancements in plant breeding, although its genetic basis is not well understood yet. This research was conducted on the materials arising from the maize single cross B73 3 H99 to study heterosis by procedures of classical genetic and quantitative trait loci (QTL) analyses. Materials were the basic generations, the derived 142 recombinant inbred lines (RILs), and the three testcross populations obtained by crossing the 142 RILs to each parent and their F 1 . For seedling weight (SW), number of kernels per plant (NK), and grain yield (GY), heterosis was .100% and the average degree of dominance was .1. Epistasis was significant for SW and NK but not for GY. Several QTL were identified and in most cases they were in the additive-dominance range for traits with low heterosis and mostly in the dominance-overdominance range for plant height (PH), SW, NK, and GY. Only a few QTL with digenic epistasis were identified. The importance of dominance effects was confirmed by highly significant correlations between heterozygosity level and phenotypic performance, especially for GY. Some chromosome regions presented overlaps of overdominant QTL for SW, PH, NK, and GY, suggesting pleiotropic effects on overall plant vigor.

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Classical Genetic and Quantitative Trait Loci Analyses of Heterosis in a Maize Hybrid Between Two Elite Inbred Lines

et al. 2007

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“…A number of methods exist to estimate genetic distance based on pedigree data, morphological data, agronomic performance data, biochemical data, and DNA data (Mohammadi and Prasanna, 2003). Several studies have reported a positive correlation between genetic distance of the parental lines and the superior hybrid performance (Liu et al, 2002;Barbosa et al, 2003). However, in maize (Zea mays), heterosis is known to culminate at an optimum of parental genetic distance before declining again (Moll et al, 1965).…”

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Heterosis of Biomass Production in Arabidopsis. Establishment during Early Development

et al. 2004

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Heterosis has been widely used in agriculture to increase yield and to broaden adaptability of hybrid varieties and is applied to an increasing number of crop species. We performed a systematic survey of the extent and degree of heterosis for dry biomass in 63 Arabidopsis accessions crossed to three reference lines (Col-0, C24, and Nd). We detected a high heritability (69%) for biomass production in Arabidopsis. Among the 169 crosses analyzed, 29 exhibited significant mid-parent-heterosis for shoot biomass. Furthermore, we analyzed two divergent accessions, C24 and Col-0, the F1 hybrids of which were shown to exhibit hybrid vigor, in more detail. In the combination Col-0/C24, heterosis for biomass was enhanced at higher light intensities; we found 51% to 66% mid-parent-heterosis at low and intermediate light intensities (60 and 120 μmol m−2 s−1), and 161% at high light intensity (240 μmol m−2 s−1). While at the low and intermediate light intensities relative growth rates of the hybrids were higher only in the early developmental phase (0–15 d after sowing [DAS]), at high light intensity the hybrids showed increased relative growth rates over the entire vegetative phase (until 25 DAS). An important finding was the early onset of heterosis for biomass; in the cross Col-0/C24, differences between parental and hybrid lines in leaf size and dry shoot mass could be detected as early as 10 DAS. The widespread occurrence of heterosis in the model plant Arabidopsis opens the possibility to investigate the genetic basis of this phenomenon using the tools of genetical genomics.

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“…The heterotic trait is expressed under heterozygosity, mainly in the F 1 generation, resulting from both complementary action and interaction of parental genetic diversity (Liu et al 2002). In general, genetic diversity should be an important basis for heterosis formation, though different results have been reported previously in various crops (Melchinger et al 1990, Zhang et al 1996.…”

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confidence: 99%

“…Since there may be only a small difference in the genetic diversity related to heterosis between them, it is much more important to identify the genetic diversity related to heterosis. This genetic diversity should be divided into the favorable and unfavorable categories, which are equally important to heterosis breeding (Liu et al 1998, Liu et al 2002. The desirable genetic diversity will enable to enhance heterosis, while the undesirable genetic diversity will reduce it.…”

Section: Discussionmentioning

confidence: 99%

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Improvement of Combining Ability for Restorer Lines with the Identified SSR Markers in Hybrid Rice Breeding

et al. 2004

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Heterosis is a heterozygous trait, depending on the genetic diversity of both parents. An approach to tag the heterosis trait with a molecular marker should be different from any other approaches for homozygous traits. To achieve this objective, it is necessary to identify the genetic diversity related to heterosis between both parents. This part of genetic diversity should be closely related to the parental combining ability, which is the most important factor for the performance of the hybrids. Based on the principle of parental combining ability, the simple sequence repeat (SSR) markers favorable and unfavorable to heterosis were identified in the previous study. In the present study, using these markers, two restorer lines with a very high combining ability, MGR44 and MGR45, were developed from the elite restorer line, Minhui63. In these two lines the favorable alleles were maintained while the unfavorable alleles were removed, resulting in the obvious increase of both the general combining ability (GCA) and special combining ability (SCA). Also, the spike density and 1000-grain weight traits were enhanced as compared with Minhui63. These results indicate that the previously selected molecular markers are very useful for hybrid rice breeding programs. Also, it was confirmed that the method described in our previous report is suitable and effective for screening molecular markers for hybrid rice breeding.

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Identification of AFLP Markers Favorable to Heterosis in Hybrid Rice.

Cited by 31 publications

References 16 publications

Classical Genetic and Quantitative Trait Loci Analyses of Heterosis in a Maize Hybrid Between Two Elite Inbred Lines

Classical Genetic and Quantitative Trait Loci Analyses of Heterosis in a Maize Hybrid Between Two Elite Inbred Lines

Heterosis of Biomass Production in Arabidopsis. Establishment during Early Development

Improvement of Combining Ability for Restorer Lines with the Identified SSR Markers in Hybrid Rice Breeding

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