密度和追肥时期对大穗型小麦^(14)C-同化作用及其分配的调控效应  

REGULATING EFFECT OF DENSITY AND TOP-DRESSING TIME OF NITROGEN FERTILIZER ON ^(14 ) C-ASSIMILATION AND DISTRIBUTION OF ASSIMILATE OF LARGE-SPIKE CULTIVAR OF WHEAT

作　　者：赵会杰[1] 邹琦[2] 郭天财[1] 于振文[2] 董中东[1] 冯春叶[1] 

机构地区：[1]河南农业大学国家小麦工程技术研究中心 [2]山东农业大学

出　　处：《核农学报》2003年第1期67-72,共6页Journal of Nuclear Agricultural Sciences

基　　金：国家重点基础研究专项经费 (G19980 10 10 0 );河南省自然科学基金 (990 4 0 1190 0 )资助

摘　　要：本研究结果表明 ,挑旗期叶片 (尤其是旗叶和倒 2叶 )是大穗型品种兰考 90 6最主要的同化器官 ,其同化量占单茎总同化量的 90 %以上 ,而叶鞘的同化量仅占1 0 %以下。密度过大不但抑制14 C 同化速率 ,而且降低14 C 同化物运输分配效率。适当推迟追肥有利于提高单茎同化量和同化物的运输分配效率。The results of present study indicated that laminas, especially first and second lamina from top, were the most important assimilating organs of large\|spike cultivar of wheat at flag leaf stage. More than ninety percent of assimilate of a single stem was made by laminas, wihle the assimilate amount of sheathes only accounted for less than 10%. Not only assimilating rate but also transport and distribution efficiency was declined when the density was too high. Deferring top\|dressing time of nitrogen fertilizer could increase both assimilate amount and transport and distribution efficiency.

关 键 词：密度 追肥时期 大穗型 小麦 ^14C-同化 调控效应 同化物分配 

分 类 号：S512.1[农业科学—作物学]