小麦灌浆期子粒淀粉合成关键酶活性对不同水氮条件的响应  

Effects of Different Water and Nitrogen Treatments on Activities of Enzymes Involved in Starch Synthesis in Wheat Grains

作　　者：李孟洁[1,2] 李红兵[2] 张丽娟[3] 陈晓丽[2] 李雨霖[2] 邓西平[2] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学水土保持研究所/黄土高原土壤侵蚀与旱地农业国家重点试验室,陕西杨凌712100 [3]西北农林科技大学生命科学学院,陕西杨凌712100

出　　处：《作物杂志》2015年第5期128-133,共6页Crops

基　　金：西北农林科技大学科技创新专项(Z109021304);国家重点基础研究发展计划(2015CB150402);国家自然科学基金(51479189)

摘　　要：在盆栽条件下,以旱地小麦品种长旱58为材料,研究了3种不同施氮条件下,灌浆期两种供水处理的小麦子粒中蔗糖代谢、淀粉积累及相关酶活性的变化特征。发现干旱处理有利于小麦灌浆前中期淀粉积累,干旱能提高子粒中蔗糖合成酶(SS)、可溶性淀粉合成酶(SSS)以及腺苷二磷酸葡萄糖焦磷酸化酶(AGPase)的活性,干旱处理会降低灌浆后期子粒中淀粉合成相关酶活性及淀粉积累。结果表明在中氮水平下,干旱处理提高了小麦灌浆前期子粒中淀粉合成相关酶的生理活性、进而促进了小麦子粒中淀粉的合成与积累。Wheat cultivar ＂Changhan 58＂ was used for investigating enzymes involved in starch synthesis in grains of wheat through systematic experiments under pot conditions with three nitrogen levels coupling two water treatments. We investigated the effects of different water and nitrogen treatments on sucrose metabolism and activities of enzymes involved in starch synthesis in grains of wheat. We found that drought treatment helped to increase activities of starch accumulation during the early mid filling stage, activities of adenosine diphosphate glucose pyrophosphorylase（ AGPase）, sucrose synthase（SS） and soluble starch synthase （SSS）. And it would decrease activities of enzymes and starch accumulation during the late filling stage. The results indicated that under the normal nitrogen level, the drought treatment could increase physiological activities of enzymes involving in starch synthesis of wheat grains, and it can also promote the accumulation of starch.

关 键 词：小麦 蔗糖代谢 ADPG焦磷酸化酶 可溶性淀粉合成酶 

分 类 号：S512.1[农业科学—作物学]