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首页> 外文期刊>Theoretical and Applied Genetics >Genetic dissection of embryo sac fertility, pollen fertility, and their contributions to spikelet fertility of intersubspecific hybrids in rice
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Genetic dissection of embryo sac fertility, pollen fertility, and their contributions to spikelet fertility of intersubspecific hybrids in rice

机译：水稻胚囊育性，花粉育性及其对亚种间杂种小穗育性的贡献

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摘要

The partial sterility of hybrids has been a major barrier for utilization of the strong heterosis expressed in hybrids between Oryza sativa ssp. indica and O. sativa ssp. japonica. Wide-compatibility varieties, comprising a special class of germplasm, are able to produce fertile hybrids when crossed to both indica and japonica varieties. However, all the work on wide compatibility and majority of studies on indica/japonica hybrid sterility reported so far were based only on spikelet fertility; thus, it is not known to what extent male and female gamete abortions influence hybrid sterility. In this study, we investigated pollen fertility, embryo sac fertility, and spikelet fertility in an F1 population of 202 true hybrid plants derived from a three-way cross (‘02428’/‘Nanjing 11’//‘Balilla’). A partial regression analysis showed that the pollen and embryo sac fertility contributed almost equally to spikelet fertility. QTL analysis based on a linkage map of 191 polymorphic marker loci identified two QTLs for pollen fertility, one QTL for embryo sac fertility, and three QTLs for spikelet fertility. The S5 locus, previously identified as a locus for wide compatibility by spikelet fertility analysis, is a major locus for embryo sac fertility, and a QTL on chromosome 5 had a major effect on pollen fertility. These two loci coincided with the two major QTLs for spikelet fertility. The study also detected a QTL on chromosome 8, showing a large effect on spikelet fertility but no effect on either pollen or embryo sac fertility. Very little interaction among the QTLs was detected. The implications of the findings in rice breeding programs are discussed.
机译：杂种的部分不育一直是利用水稻（Oryza sativa ssp）之间的杂种表达的强杂种优势的主要障碍。 and和O. sativa ssp。粳稻当与in稻和粳稻品种杂交时，包括一类特殊种质的广泛相容的品种能够产生可育的杂种。然而，到目前为止，所有关于广泛相容性的研究以及对in /粳稻杂种不育的大多数研究仅基于小穗的繁殖力。因此，尚不清楚雄性和雌性配子流产在多大程度上影响杂种不育。在这项研究中，我们调查了202种真正的杂交植物的F1种群的花粉繁殖力，胚囊繁殖力和小穗繁殖力，这些植物是通过三向杂交（'02428'/'Nanjing 11'//'Balilla' ）。部分回归分析表明，花粉和胚囊的受精对小穗受精的贡献几乎相等。基于191个多态性标记基因座的连锁图谱进行的QTL分析确定了两个花粉育性的QTL，一个胚胎囊育性的QTL和小尖峰育性的三个QTL。 S5基因座，以前被小穗繁殖力分析确定为广泛相容的基因座，是胚胎囊繁殖力的主要基因座，第5号染色体上的QTL对花粉繁殖力有重要影响。这两个基因座与小穗育性的两个主要QTL吻合。该研究还在8号染色体上检测到QTL，显示对小穗育性有很大影响，但对花粉或胚囊育性没有影响。 QTL之间几乎没有相互作用。讨论了该发现对水稻育种计划的影响。

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  • 来源
    《Theoretical and Applied Genetics》 |2005年第2期|205-211|共7页
  • 作者

    Xiang Song; S. Q. Qiu; C. G. Xu; X. H. Li; Qifa Zhang;

  • 作者单位

    National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University;

    National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University;

    National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University;

    National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University;

    National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research Huazhong Agricultural University;

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