草业学报Issue(4)：68-78,11.DOI:10.11686/cyxb20140408
不同水分条件下冬小麦灌浆期茎叶可溶性碳水化合物积累转运与籽粒灌浆的关系
Relationship between grain filling and accumulation and remobilization of water soluble carbohydrates in leaf and stem of winter wheat during the grain filling in different water conditions
摘要
Abstract
Two winter wheat cultivars with different drought tolerance were performed to investigate the rela-tionship between the grain filling and the accumulation and remobilization of water soluble carbohydrates (WSC)in flag leaves and different internodes of main stems during the grain filling in the drought stress (DS) and well watered (WW)conditions.Such tested traits as WSC contents,WSC remobilization rates and WSC contribution rates of different organs,grain weight and grain-filling rate were more significantly affected by the water condition,growth stage and/or organ,whereas different tested traits showed significant specificity in re-sponse to above-mentioned factors.The variation trend in WSC contents of different organs was of a rise first and then fall during the grain filling.The maximum WSC content of drought-tolerant cultivar Longjian 19 oc-curred on 18 DAA (days after anthesis)under both the DS and the WW,while did on 12 DAA in water-sensi-tive cultivar Q9086 in the DS.The DS might substantially increase WSC accumulation in different organs and improve WSC contribution rates to grain weight by remobilizing WSC built up in different organs during the pre-anthesis.The profit was more conducted in peduncle and penultimate internodes of Longjian 19.In this case,WSC contents,in turn,were up to 196.83 and 242.35 mg/g DW,WSC remobilization rates reached to 66.15% and 63.21%,and WSC contribution rates were up to a maximum of 12.48% and 8.67%,respective-ly.Although the DS shortened the course of grain filling,Longjian 19 still performed higher grain-filling rate and greater grain weight of main spikes.Positive correlations were found not only between WSC contents of different organs and grain-filling rates of main spikes,but also between WSC remobilization rates and its con-tribution rates.Furthermore,these correlations were significantly higher under the DS than the WW condi-tion .It indicated that drought stress could enhance the accumulation and remobilization of WSC of different or-gans in wheat,and more buildup of WSC in peduncle and penultimate internodes might play an important role in compensating grain filling under the DS.关键词
小麦/干旱胁迫/可溶性碳水化合物/积累转运/籽粒灌浆Key words
wheat/drought stress/water soluble carbohydrates/accumulation and remobilization/grain filling分类
农业科技引用本文复制引用
马召朋,栗孟飞,杨德龙,陈晓平,陈菁菁,刘媛,李唯..不同水分条件下冬小麦灌浆期茎叶可溶性碳水化合物积累转运与籽粒灌浆的关系[J].草业学报,2014,(4):68-78,11.基金项目
甘肃省干旱生境作物学重点实验室开放基金项目（GSCS-2010-04），国家自然科学基金项目（30960195），教育部科学技术研究重点项目（211183）和甘肃省科技支撑计划项目（1104NKCA095）资助。 （）
