A QTL cluster for plant architecture and its ecological significance in Asian wild rice
A QTL cluster for plant architecture and its ecological significance in Asian wild rice
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DOI：
10.1270/jsbbs.57.7
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发表时间：
2007-03-01
期刊：
影响因子：
2.4
通讯作者：
Sano, Yoshio
中科院分区：
文献类型：
--
作者：
Onishi, Kazumitsu;Horiuchi, Yuki;Sano, Yoshio
亚洲水稻（Oryza sativa）的野生祖先（Oryza rufipogon）在生活史性状方面表现出广泛的变异，形成了一年生-多年生的连续体。一年生野生稻的一个显着特征是其对受干扰的生境的适应性，以及其矮小、分蘖多和平伏的生长习性。本研究通过数量性状基因座（QTL）分析来检查野生一年生和栽培（粳型）水稻品系之间的遗传分化。总共，在重组自交系 (RIL) 中评估了 20 个适应性和/或驯化相关性状。在整个基因组中总共检测到 28 个推定的 QTL。 6个负责株型的QTL位于7号染色体短臂上，与该QTL簇所在区域的近等基因系证实，该QTL在栽培稻遗传背景下对株型产生显着影响。在不同来源的另一个一年生品系中也发现了类似的QTL簇，表明该QTL簇可能在一年生野生稻中占优势。此外，在 7 号染色体上的簇区域内检测到了一个耐受干扰（模拟践踏）的 QTL。这些结果在野生一年生水稻中的生态意义得到了讨论。
The wild progenitor (Oryza rufipogon) of Asian rice (Oryza sativa) shows a wide range of variations in life-history traits, forming an annual-perennial continuum. A conspicuous feature of an annual type of wild rice is represented by its adaptability to disturbed habitats, and its short stature with many tillers and a prostrate growth habit. The present study was carried out to examine the genetic differentiation between wild annual and cultivated (Japonica type) rice strains by quantitative trait locus (QTL) analysis. In total, 20 adaptive and/or domestication-related traits were evaluated in recombinant inbred lines (RILs). A total of 28 putative QTLs were detected across the genome. Six QTLs responsible for plant architecture were located on the short arm of chromosome 7. The near-isogenic line with the region containing the QTL cluster confirmed that the QTLs exerted a significant effect on the plant architecture in the genetic background of cultivated rice. A similar QTL cluster was also found in another annual strain of a different origin, suggesting that the QTL cluster might be predominant in annual wild rice. Furthermore, a QTL for tolerance to disturbance (simulated trampling) was detected within the region of the cluster on chromosome 7. These results are discussed in relation to their ecological significance in wild annuals of rice.