Genetic analysis of rice grain quality
Genetic analysis of rice grain quality
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DOI：
10.1007/s001220051098
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发表时间：
1999-03-01
影响因子：
5.4
通讯作者：
Zhu, LH
中科院分区：
文献类型：
--
作者：
He, P;Li, SG;Zhu, LH
由于上位效应、母体效应和细胞质效应，谷物品质的遗传比谷物其他农艺性状的遗传更为复杂。和胚乳的三倍体性质。在本研究中，利用来自籼粳杂交花药培养物的已建立的水稻DH群体来进行水稻籽粒品质的遗传分析。对 DH 品系和亲本品种的直链淀粉含量 (AC)、碱扩散分数 (ASS)、凝胶稠度 (GC)、白核谷物百分比 (PGWC) 和白核平方 (SWC) 总共五个参数进行了估计。对于每个父母来说，北京、杭州和成都三个地点的每个参数值都相对稳定，而父母之间的这五个参数的差异均显着。 AC 呈双峰分布，ASS 的分布偏向于 JX17 的值，而其他三个参数在 DH 系中呈连续分布，且存在部分海侵分离。对于AC，在5号和6号染色体上分别发现了一个次要基因和一个主要基因。主基因应该是 wx 的等位基因，解释了总变异的 91.9%。对于GC，分别在2号和7号染色体上鉴定出两个QTL。对于ASS，次要基因和主要基因均位于6号染色体上。主要基因应与碱变性基因位于同一基因座。在QTL定位中发现alk和wx之间的遗传连锁。对于 PGWC，两个 QTL 位于 8 号和 12 号染色体上。对于 SWC，仅在 3 号染色体上发现了一个较小的 QTL。本文提供的结果和分子标记可能有助于水稻育种以提高谷物品质。
The inheritance of grain quality is more complicated than that of other agronomic traits in cereals due to epistasis, maternal and cytoplasmic effects. and the triploid nature of endosperm. In the present study, an established rice DH population derived from anther culture of an indica/japonica hybrid was used for genetic analysis of rice grain quality. A total of five parameters, amylose content (AC), alkali-spreading score (ASS), gel consistency (GC), percentage of grain with a white core (PGWC) and the square of the white core (SWC), were estimated for the DH lines and the parent varieties. For each parent, the value of each parameter was relatively stable in three locations, Beijing, Hangzhou and Chengdu, while the differences between the parents were significant for all five parameters. AC showed a bimodal distribution, and the distribution of ASS was skewed toward the value of JX17, while the other three parameters displayed continuous distributions among the DH lines with partially transgressive segregations. For AC, a minor and a major gene were found on chromosomes 5 and 6 respectively. The major gene, which should be an allele of wx, explained 91.9% of the total variation. For GC, two QTLs were identified on chromosomes 2 and 7 respectively. For ASS, a minor and a major gene were both located on chromosome 6. The major gene should be the same locus as the alkali degeneration gene talk). Genetic linkage between alk and wx was found in QTL mapping. For PGWC, two QTLs were located on chromosomes 8 and 12. Only a minor QTL was found for SWC on chromosome 3. The results and the molecular markers presented here may be useful in rice breeding for grain quality improvement.