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作 者 ：张怀渝，王化新，郭大智,李尧权

期 刊 ：核农学报 1995年 9卷 03期 页码：0-0

关键词：大麦；~(14)C示踪；光合产物分配；产量；生育期；

Keywords:Barley, 14 C-tracer technique, distribution of photosythate, yield, growth stage,

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。

Abstract: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。

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