Gene actions at loci underlying several quantitative traits in two elite rice hybrids
Gene actions at loci underlying several quantitative traits in two elite rice hybrids
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两个优良水稻杂交种中几个数量性状背后的基因座的基因作用
DOI：
10.1007/s00438-010-0575-y
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发表时间：
2010-09
期刊：
影响因子：
--
通讯作者：
李兰芝
中科院分区：
文献类型：
--
作者：
李兰芝
为了了解控制水稻9个重要农艺数量性状的基因活性，我们应用北卡罗来纳州设计3(NC III设计)对高度杂种优势的亚种间(IJ)和亚种内(II)杂交种的重组自交系(RIL)进行了以下任务：(1)通过世代平均分析和方差分量估计，考察加性、显性和上位性效应对表现性状的相对贡献；(2)检测表型性状的QTL数量、基因组位置和遗传效应；以及(3)表征它们的基因作用模式。在F-∞度量下，世代均值分析和方差分量估计表明，两个杂交种的大多数性状都以上位性效应为主。QTL分析分别检测到48个和66个主效QTL(M-QTL)。在杂交稻中，20个QTL(41.7%)表现为基因效应的加性效应，20个(41.7%)表现为部分-完全显性，8个(16.7%)表现为超显性。其中，34个QTL(51.5%)表现加性效应，14个(21.2%)表现部分-完全显性，18个(27.3%)表现超显性。杂交种中有153个双基因互作(E-QTL)，杂交种中有252个双基因互作。这些结果表明，加性效应、显性、超显性，特别是上位性，是两个杂交种性状表达的遗传基础。此外，我们还确定了表型性状及其杂种优势的遗传原因是不同的。在所研究的植物中，所研究的表型性状及其杂种优势分别受到不同的M-QTL和E-QTL的制约，主要是由于非等位互作(上位性)。
To understand the gene activities controlling nine important agronomic quantitative traits in rice, we applied a North Carolina design 3 (NC III design) analysis to recombinant inbred lines (RILs) in highly heterotic inter- (IJ) and intra-subspecific (II) hybrids by performing the following tasks: (1) investigating the relative contribution of additive, dominant, and epistatic effects for performance traits by generation means analysis and variance component estimates; (2) detecting the number, genomic positions, and genetic effects of QTL for phenotypic traits; and (3) characterizing their mode of gene action. Under an F∞-metric, generation means analysis and variance components estimates revealed that epistatic effects prevailed for the majority of traits in the two hybrids. QTL analysis identified 48 and 66 main-effect QTL (M-QTL) for nine traits inIJandIIhybrids, respectively. InIJhybrids, 20 QTL (41.7%) showed an additive effect of gene actions, 20 (41.7%) showed partial-to-complete dominance, and 8 (16.7%) showed overdominance. InIIhybrids, 34 QTL (51.5%) exhibited additive effects, 14 (21.2%) partial-to-complete dominance, and 18 (27.3%) overdominance. There were 153 digenic interactions (E-QTL) in theIJhybrid and 252 in theIIhybrid. These results suggest that additive effects, dominance, overdominance, and particularly epistasis attribute to the genetic basis of the expression of traits in the two hybrids. Additionally, we determined that the genetic causes of phenotypic traits and their heterosis are different. In the plants we studied, the phenotypic traits investigated and their heterosis were conditioned by different M-QTL and E-QTL, respectively, and were mainly due to non-allelic interactions (epistasis).
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影响因子：
3.3
作者：
A. E. Melchinger;H. Utz;C. Schön
通讯作者：
A. E. Melchinger;H. Utz;C. Schön
影响因子：
7.4
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影响因子：
3.3
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M. Causse;Theresa;-M.;Fulton;Yong-Gu Cho;Sang;J. Chunwongse;Jinhua Xiao;Sandra;-E.;Hanington;G. Sécond;S. McCouch;S. Tanksley
影响因子：
3.3
作者：
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通讯作者：
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影响因子：
3.3
作者：
Kusterer, Barbara;Piepho, Hans-Peter;Melchinger, Albrecht E.
通讯作者：
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