作物学报 ›› 2016, Vol. 42 ›› Issue (02): 230-242.doi: 10.3724/SP.J.1006.2016.00230
徐云姬,钱希旸,李银银,王志琴,杨建昌*
XU Yun-Ji,QIAN Xi-Yang,LI Yin-Yin,WANG Zhi-Qin,YANG Jian-Chang*
摘要:
本研究旨在探明根系分区交替灌溉对玉米强、弱势粒灌浆及其相关生理特性的影响。以高产玉米品种登海11为材料,自抽雄至成熟设置常规灌溉(CI)和根系分区交替灌溉(PAI) 2种灌溉方式,观察植株穗位叶的光合特性、衰老特性、茎鞘非结构性碳水化合物(NSC)运转、强势粒和弱势粒中乙烯和多胺含量、籽粒灌浆特征及淀粉积累特性等变化。结果表明,与CI相比,PAI显著增加了籽粒产量,提高了灌浆后期穗位叶的光合性能,延缓了叶片衰老,促进了玉米茎鞘NSC的运转,增加了弱势粒中亚精胺(free-Spd)和精胺(free-Spm)含量,降低了弱势粒中腐胺(free-Put)含量和乙烯释放速率。PAI对强势粒多胺含量、乙烯释放速率以及灌浆速率和淀粉积累速率无显著影响。相关分析表明,籽粒灌浆速率和淀粉积累速率与内源free-Spd和free-Spm含量呈极显著正相关,与乙烯释放速率呈显著或极显著负相关。表明灌浆期较强的叶片光合能力、较高的茎鞘NSC运转率、弱势粒中较高的free-Spd和free-Spm水平以及较低的乙烯释放速率是PAI促进弱势粒灌浆和提高产量的重要原因。
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