Latitudinal Distribution and Differentiation of Rice Germplasm: Its Implications in Breeding
Latitudinal Distribution and Differentiation of Rice Germplasm: Its Implications in Breeding
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DOI：
10.2135/cropsci2010.07.0431
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发表时间：
2011-05-01
期刊：
影响因子：
2.3
通讯作者：
Lu, B-R
中科院分区：
文献类型：
--
作者：
Xiong, Z. Y.;Zhang, S. J.;Lu, B-R
为了研究水稻（Oryza sativa L.）利用插入和缺失（InDel）分子标记分析了386个水稻品种、5个非洲水稻品种和52个主要来自亚洲的野生稻种质。主成分分析将水稻分为两个不同的群体，尽管非洲水稻和野生水稻没有显示出这种分组。结果表明，与非洲稻和野生稻相比，水稻的籼粳分化明显，适应环境范围广。对地理分布的分析表明，不同类型的水稻有一个明确的模式，其中籼稻品种分布在从南纬2度到北纬40度的广泛纬度范围内，而粳稻品种大多局限于北纬15度以上的纬度。大多数中间型分布在纬度低于27 ° N的地区。沿着纬度梯度的水稻类型与温度的相关性表明，籼稻品种对温度沿着纬度梯度不敏感，而粳稻品种对温度高度敏感。不同类型水稻在大纬度范围内的分布和分化很可能是它们适应生态和环境因素，特别是温度的结果。结合籼粳型的准确鉴定，对杂交水稻选育分化亲本具有重要意义。
To determine genetic differentiation of rice (Oryza sativa L.) across a latitudinal gradient, a total of 386 rice varieties, five African rice varieties, and 52 wild rice accessions mainly from a wide range of Asia were analyzed using insertion and deletion (InDel) molecular markers. Principal component analysis divided rice into two distinct groups, although African rice and wild rice did not show such grouping. Results indicated significant indica-japonica differentiation of rice adapted to a wide range of environments, contrasting with African rice and wild rice. Analysis of the geographic distribution indicated a clear pattern for different types of rice, in which indica varieties were found across a wide range of latitudes from similar to 2 degrees S to 40 degrees N and japonica mostly limited to latitudes greater than 15 degrees N. Most intermediate types were distributed in regions at latitudes lower than 27 degrees N. Correlation between rice types and temperature along the latitude gradients suggested that indica varieties are less sensitive to temperature along the latitude ranges but japonica varieties are highly sensitive to temperature. The distribution and differentiation of various types of rice across the large latitudinal range is most likely the consequence of their adaptation to ecological and environmental factors, especially temperature. This, together with the accurate determination of indica and japonica types has important implications for hybrid rice breeding through selecting properly differentiated parents.