Characterization of interspecific hybrids and backcross progenies from a cross between Oryza minuta and Oryza sativa.

Science in China. Series C, Life Sciences / Chinese Academy of Sciences Pub Date : 2009-12-01 Epub Date: 2009-12-17 DOI:10.1007/s11427-008-0155-0

SiBin Guo, FaLan Qin, DuanPin Zhang, XingHua Lin

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引用次数: 8

Abstract

Oryza minuta, a tetraploid wild relative of cultivated rice, is an important source for the genetic improvement. Interspecific hybrids were obtained from the cross of O. sativa L. (IR24) and O. minuta (Acc. No. 101133) with 5.58% crossability, which ranged from 0.11% to 1.62% in the backcross generations. The chromosome numbers of the backcross progenies were 24 to 48. Seven yield-related traits of the parents, hybrid F(1), and backcross progenies were evaluated. Simple sequence repeat markers analysis showed that the polymorphism ratio of SSR bands between IR24 and Acc. No. 101133 was 93.2%. The average donor segment number, length, donor genome size, and percentage of donor genome of 92 BC(3)F(1) plants (2n=24) were 24.1, 17.8 cM, 438.4 cM and 26.2%, respectively. They were complex variation and uneven among the chromosomes. These introgression lines could be used to identify the favorable genes of O. minuta and provide a new platform for the genetic improvement of cultivated rice.

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米与米的种间杂交种及回交后代的特性。

米塔(Oryza minuta)是栽培水稻的四倍体野生近缘种质，是重要的遗传改良资源。用IR24与Acc杂交获得了种间杂种。代交率为5.58%，回交代交率为0.11% ~ 1.62%。回交后代的染色体数为24 ~ 48。对亲本、杂种F(1)和回交后代的7个产量相关性状进行了评价。简单序列重复标记分析表明，IR24与Acc之间的SSR频带多态性比率较高。第101133号为93.2%。92 BC(3)F(1)株(2n=24)的平均供体片段数、长度、供体基因组大小和供体基因组百分比分别为24.1%、17.8 cM、438.4 cM和26.2%。它们是复杂变异和不均匀的染色体。这些基因渐渗系可用于鉴别稻的有利基因，为栽培稻的遗传改良提供新的平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Science in China. Series C, Life Sciences / Chinese Academy of Sciences

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