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首页> 外文期刊>Journal of Experimental Botany >Allelic interaction of F1 pollen sterility loci and abnormal chromosome behaviour caused pollen sterility in intersubspecific autotetraploid rice hybrids
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Allelic interaction of F1 pollen sterility loci and abnormal chromosome behaviour caused pollen sterility in intersubspecific autotetraploid rice hybrids

机译：F 1 花粉不育位点的等位基因相互作用与异常染色体行为导致亚种间四倍体水稻杂交种的花粉不育

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摘要

The intersubspecific hybrids of autotetraploid rice has many features that increase rice yield, but lower seed set is a major hindrance in its utilization. Pollen sterility is one of the most important factors which cause intersubspecific hybrid sterility. The hybrids with greater variation in seed set were used to study how the F1 pollen sterile loci (S-a, S-b, and S-c) interact with each other and how abnormal chromosome behaviour and allelic interaction of F1 sterility loci affect pollen fertility and seed set of intersubspecific autotetraploid rice hybrids. The results showed that interaction between pollen sterility loci have significant effects on the pollen fertility of autotetraploid hybrids, and pollen fertility further decreased with an increase in the allelic interaction of F1 pollen sterility loci. Abnormal ultra-structure and microtubule distribution patterns during pollen mother cell (PMC) meiosis were found in the hybrids with low pollen fertility in interphase and leptotene, suggesting that the effect-time of pollen sterility loci interaction was very early. There were highly significant differences in the number of quadrivalents and bivalents, and in chromosome configuration among all the hybrids, and quadrivalents decreased with an increase in the seed set of autotetraploid hybrids. Many different kinds of chromosomal abnormalities, such as chromosome straggling, chromosome lagging, asynchrony of chromosome disjunction, and tri-fission were found during the various developmental stages of PMC meiosis. All these abnormalities were significantly higher in sterile hybrids than in fertile hybrids, suggesting that pollen sterility gene interactions tend to increase the chromosomal abnormalities which cause the partial abortion of male gametes and leads to the decline in the seed set of the autotetraploid rice hybrids.
机译：同源四倍体水稻的亚种间杂种具有增加水稻产量的许多特征，但结实率较低是其利用的主要障碍。花粉不育是引起亚种间杂种不育的最重要因素之一。使用种子集变异较大的杂种研究F 1 花粉不育基因座（Sa，Sb和Sc）如何相互作用，以及F 1的异常染色体行为和等位基因相互作用> 1 不育位点影响亚种间同源四倍体水稻杂种的花粉繁殖力和种子集。结果表明，花粉不育位点之间的相互作用对同源四倍体杂种的花粉育性有显着影响，花粉育性随着F 1 花粉不育基因座等位基因相互作用的增加而进一步降低。花粉母细胞（PMC）减数分裂在相间和瘦素的低花粉育性的杂种中发现异常的超微结构和微管分布模式，这表明花粉不育基因座相互作用的影响时间非常早。在所有杂种中，四价和二价的数目和染色体构型存在极显着的差异，并且四价价随着同四倍体杂种种子集的增加而降低。在PMC减数分裂的不同发育阶段，发现了许多不同类型的染色体异常，例如染色体散乱，染色体滞后，染色体分离异步和三裂变。不育杂种中所有这些异常均显着高于可育杂种，这表明花粉不育基因相互作用倾向于增加染色体异常，从而导致雄配子部分流产并导致同源四倍体水稻杂种的种子下降。

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