杂交水稻苗期生长优势与~(32)P、~(14)C在分蘖的分布

试验杂交水稻的分蘖数量除L301A×R29比不育系和常规高产品种“双桂36”较少外,D优63、D优64、青优中、协优64、威优64、威优35和华优63分别比其亲本和对照品种多,表现正显性超亲优势.青优中、协优64、威优64、威优35、华优63和D优63的分蘖数与~(32)P在分蘖中的分布(％)呈正相关.D优64、L301A×R29不呈正相关.D优63、D优64、协优64的分蘖数与~(14)C—同化物在化分蘖的分布(％)呈正相关,青优中、威优64、威优35华优63和L301A×R29不呈正相关.D优63、D优64、协优64和华优63的单苗干物重高于它们的亲本和对照品种.青优中、协优64、华优63、D优63、D优64的苗高也分别比其亲本和对照品种高.本文还讨论了杂交稻苗期生长优势、~(32)P和~(14)C在分蘖中的分布(％)与谷粒产量的关系.

Seedling Growth Vigor and ~(32)P, ~(14)C Distributed in Tillers of Hybrid Rice

Hybrid rice D-You-63, D-You-64, Ging-You-Zhong, Xie-You-64, Wei-You-64, Wei-You-35 and Hua-You-63 have more tillering capability and tiller number over their parents and CK variety 'Shuang-Gui-36' with positive superdominance heterosis (hp) respectively, but L30lAx R29 has less tillers than the sterile line. Between tiller number and ~(32)P distributed (%) in tillers of Ging-You-Zhong, Xie-You-64, Wei-You-64, Wei-You-35, Hua-You-63 and D-You-63 positive correlation has shown except D-You-64 and L30lA x R29. Negative correlation is between tiller number and ~(14)C distributed (%) in tillers of Ging-You-Zhong, Wei-You-64, Wei-You-35, Hua-You-63 withuot D-You-63 D-You-64. and Xie-You-64, Seedling plant dry weight of D-You-63, D-You-64, Xie-You-64 and Hua-You-63 have exceeded to their parents and CK variety. In seedling plant height Ging-You-Zhong, Xie-You-64, Hua-You-63, D-You-64 have higher than their parents and CK variety.The relationship between the grain yield and seedling plant vigor has been discussed in this paper.