...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Genetic composition of yield heterosis in an elite rice hybrid
【24h】

Genetic composition of yield heterosis in an elite rice hybrid

机译：优质杂交水稻产量杂种优势的遗传组成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Heterosis refers to the superior performance of hybrids relative to the parents. Utilization of heterosis has contributed tremendously to the increased productivity in many crops for decades. Although there have been a range of studies on various aspects of heterosis, the key to understanding the biological mechanisms of heterotic performance in crop hybrids is the genetic basis, much of which is still uncharacterized. In this study, we dissected the genetic composition of yield and yield component traits using data of replicated field trials of an "immortalized F2" population derived from an elite rice hybrid. On the basis of an ultrahigh-density SNP bin map constructed with population sequencing, we calculated single-locus and epistatic genetic effects in the whole genome and identified components pertaining to heterosis of the hybrid. The results showed that the relative contributions of the genetic components varied with traits. Overdominance/pseudo-overdominance is the most important contributor to heterosis of yield, number of grains per panicle, and grain weight Dominance x dominance interaction is important for heterosis of tillers per plant and grain weight and has roles in yield and grain number. Single-locus dominance has relatively small contributions in all of the traits. The results suggest that cumulative effects of these components may adequately explain the genetic basis of heterosis in the hybrid.
机译：杂种优势是指杂种相对于亲本的优越表现。数十年来，杂种优势的利用已极大地促进了许多作物的生产力提高。尽管已经对杂种优势的各个方面进行了广泛的研究，但了解作物杂种杂种表现的生物学机制的关键是遗传基础，其中许多仍未表征。在这项研究中，我们使用来自水稻杂交种的“永生化F2”种群的重复田间试验数据，分析了产量和产量构成特征的遗传组成。基于人口测序构建的超高密度SNP bin图，我们计算了整个基因组中的单基因座和上位基因遗传效应，并确定了与杂种优势有关的成分。结果表明，遗传成分的相对贡献随性状而变化。显性/拟显性优势是产量，单穗粒数和籽粒杂种优势的最重要因素。优势x优势交互作用对单株和籽粒分till的杂种优势很重要，并与产量和籽粒数量有关。单基因座优势在所有特征中的贡献相对较小。结果表明，这些成分的累积效应可以充分解释杂种优势的遗传基础。

著录项

  • 来源
  • 作者

    Gang Zhou; Ying Chen; Wen Yao; Chengjun Zhang; Weibo Xie; Jinping Hua; Yongzhong Xing; Jinghua Xiao; Qifa Zhang;

  • 作者单位

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China,College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China;

    National Key LCentre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

    National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research (Wuhan), Huazhong Agricultural University,Wuhan 430070, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    epistasis; recombinant inbred intercross;

    机译：上位性重组自交系;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号