大麦光合产物的分配、再分配与产量形成的关系  

RELATIONSHIP BETWEEN DISTRIBUTION AND REDISTRIBUTION OF THE ASSIMILATES AND GRAIN YIELD IN BARLEY

作　　者：张怀渝[1] 王化新[1] 郭大智[1] 李尧权[1] 

机构地区：[1]四川农业大学原子能农业应用研究室,四川农业大学农业科技学院

出　　处：《核农学报》1995年第3期168-174,共7页Journal of Nuclear Agricultural Sciences

摘　　要：本试验以二棱型（Ａ）和六棱型（Ｂ）两个大麦品种为材料，应用￣（１４）Ｃ示踪技术，对大麦各生育期￣（１４）Ｃ光合产物在各器官中的分配、再分配及其干物质积累的关系进行了研究。试验表明：１．不同生育期光合产物的分配与再分配方式不同，分蘖和拔节期光合产物主要用于根系、茎叶的生长，只有１３．５％（分蘖期），８．９５％（拔节期）分配到籽粒中，抽穗和灌浆期光合产物主要用于籽粒充实和灌浆，分别有４７．２％（Ａ）和４８．１％（Ｂ），７２．１％（Ａ）和８８．１％（Ｂ）分配到籽粒，２．光合产物在器官中的分配率与各器官数的多少呈正相关，分配量取决于分配率和整株净光合量。分蘖、拔节、抽穗、灌浆期光合产物对籽粒产量的贡献分别为１３．４％（Ａ）和１５．４％（Ｂ），１６．９％（Ａ）和１６．０％（Ｂ），３８．４％（Ａ）和３７．５％（Ｂ），３１．２％（Ａ和Ｂ）．抽穗期是籽粒产量形成的重要时期。３．根可作为拔节期光合产物的暂时贮存库，４．六棱型大麦穗的光合能力和光合产物在穗中的￣（１４）Ｃ分配率较二棱型大麦高。Distribution and redistribution of the assimilates of swo winter barley varieties with 2-rowear(A) 3nd 6- row ear(B)type were studied by 14C-tracer technique.The results indicat-ed that the contribution of assimilates to grain yield at tillering,elongation , heading and filling stage were 13.5%(A) and 13.4%(B),15.7%(A) and 16.5%(B),40.8%(A)and 4.7%(B) and 25.5%(A)and 28.9%(B),respectively.The yield was mainly determined by photosynthesis taking place ln heading stage.14C-assimilate distribution rate in organs was positively correlated with numbers and weight of organs.Distributed assimilate amount was determined by;14C-assimilate distribution rate and the net photosynthetic amount of bar-ley plant.Photosynthetic efficiency in the 6-row ear barley variety was higher than that in he 2-row ear one. Barley root might become temporary sink during stem rapid growth.A little assimilate in root was transfered to main shoot before filling stage。

关 键 词：大麦 光合产物 产量 生育期 

分 类 号：S512.301[农业科学—作物学]