| 水稻亲本遗传分化程度与籼粳杂种优势的关系 |
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| 引用本文： | 李任华,徐才国.水稻亲本遗传分化程度与籼粳杂种优势的关系[J].作物学报,1998,24(5):564-576. |
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| 作者姓名： | 李任华 徐才国 |
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| 作者单位： | 中国农业大学，北京，100094 |
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| 摘 要： | 本文利用两套材料，即来自一个籼／粳交（圭６３０／０２４２８）的双单倍体（ＤＨ）系和另一组由多种类型的籼、粳组成的对照组，从分子水平上研究了水稻亲本的遗传分化程度。在此基础上探讨了亲本的遗传分化程度与籼粳杂种优势的关系。两套测交Ｆ１群体的结果一致表明，亲本遗传分化程度对穗数和千粒重的影响相对较小，但是对每穗结实粒数和结实率这两项体现育性的指标影响较大。当亲本遗传分化综合指数ＴＤｊ值为２０￣２５时，育
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| 关 键 词： | 水稻 遗传分化 杂种优势 基因频率 籼粳 |
| 收稿时间： | 1997-06-06 |
| 修稿时间： | 1997-12-03 |
Relationship between the Extent of Genetic Differentiation in Parental lines and Heterosis of Indica-Japonica Hybrid Rice |
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| Li Renhua Xu Caiguo He Yuqing Yuan Longping Wang Xiangkun.Relationship between the Extent of Genetic Differentiation in Parental lines and Heterosis of Indica-Japonica Hybrid Rice[J].Acta Agronomica Sinica,1998,24(5):564-576. |
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| Authors: | Li Renhua Xu Caiguo He Yuqing Yuan Longping Wang Xiangkun |
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| Institution: | China Agricultural University,Beijing 100094 |
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| Abstract: | The extent of genetic differentiation in the parents of hybrid rice was investi
gated at molecular level, using two sets of rice materials, i. e. , a set of doubled haploid lines de
rived from an Indica/Japonica cross and another set of Indica or Japonica lines representing a
broad spectrum of the Asian cultivated rice gene pool including landraces, primitive cultivars,
historically important cultivars, modern elite cultivars, super rice and parents of superior hy
brids. Results of two sets of test-cross F1 populations showed congruently that the extent of
parental genetic differentiation has a relatively low impact on the heterosis of two yield compo
nents, i. e. , panicle number and 1000-grain weight. But it has a great bearing on the fertility
parameters, i. e. , filled grains per plant and seedset. There was a peak for the distribution of
fertility at the interval of 20 to 25 in TDj, so was a peak for grain yield. Thus fertility was the
most sensitive but important factor influenced by the extent of parental genetic differentiation.
On the other hand, our results showed that intermediote parents with moderate I-J differentia
tion played an important role in the utilization of rice heterosis. |
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| Keywords: | Oryza sativa L Genetic differentiation Heterosis |
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