小麦主茎光合产物的运转与分配

TRANSPORTATION AND DISTRIBUTION OF ^(14)C-PHOTOSYNTHATE PRODUCED IN MAIN STEMS OF WHEAT

分蘖期主茎与分蘖间联系密切,主茎光合产物主要用于主茎叶片、分蘖和根系的生长。本研究3个供试小麦品种中,徐州26主茎运送到分蘖Ⅰ和Ⅱ的光合产物比例分别为6.15%和5.92%,显著高于9559的4.38%和3.84%;随着生育进程,主茎和分蘖之间较为独立,光合产物在主茎和有效分蘖间的运转比例降低,供试品种间光合产物分配比例的差异缩小。拔节期主茎的光合产物主要用于自身茎鞘的生长;抽穗期主茎的光合产物主要用于自身茎鞘及穗的生长;至成熟期,主茎功能叶片在抽穗期合成的14C-光合产物主要分配到自身的茎鞘、颖壳及籽粒中,且籽粒分配量高于其他器官。

At tillering stage, the connection of main stem and tiller was close, ^14C-photosynthate produced in main stems was used for the growth of leaves of main stem, tillers and roots. In Xuzhou 26 6.15% and 5.92% ^14C-photosynthate were transported from main stem to tiller Ⅰ and Ⅱ respectively,Which were significantly higher than those in 9559（4.38% and 3.84 % ）. However with the growth of plant, the main stem and tiller was more and more independent, The proportion of ^14C- photosynthate which were transported between main stem and tillers decreased, and the difference of ^14C-photosynthate transportation among three varieties was smaller. At jointing stage, ^14C-photosynthate produced in main stem was mostly used by stem and sheath of itself. At heading stage, ^14C-photosynthate produced in main stem was mostly used by spike and stem of itself. At maturity, ^14C-photosynthate produced at heading stage in the labelled leaf blade was mostly transported to grain, glumes, stem and leaf sheath, and the distribution to grain was the highest among all organs（32.76% - 41.81% ）.