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—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F_1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,育性指标有一个峰值,对应产量优势也有一个峰值。亲本遗传分化程度对杂种优势的影响主要体现在育性这一敏感也是主要因子上。另一方面,本研究结果表明中间型亲本在水稻杂种优势利用上具有重要的地位。
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.
出处
《作物学报》
CAS
CSCD
北大核心
1998年第5期564-576,共13页
Acta Agronomica Sinica
基金
国家自然科学
