作　　者： ; ; ; ; ; ;

机构地区： 南京农业大学农学院作物遗传与种质创新国家重点实验室

出　　处： 《江苏农业学报》 2002年第4期193-198,共6页

摘　　要： 　利用14C 同位素示踪技术,研究了几种重穗型杂交稻在低光强下的光合适应特性及其生理机制。结果表明:遮光14d处理导致重穗型杂交稻生物、经济产量和14C 光合生产能力明显下降,下降的幅度因品种而异,重穗型杂交稻"特优124"与"汕优63"下降的幅度小,且受低光强处理后的光合恢复能力强,属耐荫性类型;重穗型杂交稻"Ⅱ优162"、"两优培九"则相反,属不耐荫类型;"粤优938"介于上述两种类型之间。产量构成因素的分析结果表明,遮光处理易引起重穗型杂交稻Ⅱ优162、两优培九结实率低和籽粒充实度不饱满现象的发生。对低光强下的叶片叶绿素含量及组分的分析表明,特优124和汕优63的叶绿素b含量有所增加,而Ⅱ优162和两优培九的叶绿素b/a值则有较大程度的下降。 The characteristics of photosynthetic adapatation and physiologic mechanisms of heavy ear hybrid rice combinations under shading treatment were studied by using 14Cisotope tracer techniques.Dry matter weight of plant,grain yield and 14Cassimilate in heavy ear hybrid rice combinations decreased sharply owing to 14 d shading treatment.'Teyou 124'and 'Shanyou 63'had more stable abilities to produce dry matter of plant,grain yield and 14Cassimilate under shading treatment and strong abilities to recover its photosynthetic rate after shading treatment, and were identified as a shade tolerant type'Eryou 162'and'Liangyoupeijiu',on the opposite side, were considered as a shade sensitive type'Yueyou 938'was a type between shade tolerant and sensitive. Shading treatment resulted in low seed setting rate and nonfull grain filling in Eryou 162 and Liangyoupeijiu based on analysis of the yield constituents. The content of chlorophyll b and the ratio of chlorophyll b/a reduced significantly under shading treatment in Eryou 162 and Liangyoupeijiu as compared with those in Teyou 124 and Shanyou 63.

关 键 词： 重穗型 杂交稻 耐荫性

领　　域： [农业科学]