作物学报2017，Vol.43Issue(8)：1196-1204,9.DOI:10.3724/SP.J.1006.2017.01196
玉米弱势粒库活性与籽粒内源激素及多胺含量的关系
Relationship of Sink Activity with Endogenous Hormones and Polyamine Con-tents in Inferior Kernels of Maize
摘要
Abstract
Sink activity at blister stage of maize is the primary limiting factor of the abortion and/or filling stagnation of inferior kernels. Clarifying the effect of endogenous hormone and polyamine contents on sink activity of inferior kernels in maize is of great importance for regulating inferior kernels in crowding maize colony. In this present study, two typical commercial maize hybrids Zhengdan 958 and Xianyu 335 were planted in 2014 and 2015. At silking stage, two pollination treatments, incomplete pollination (IcP) and complete pollination (CP), were imposed to each cultivar. The objective of incomplete pollination, in which the pollinated filaments within the basal region of ear was decreased by hand-cutting, was to stimulate the inferior kernel setting in the apical region of ear, where the inferior kernels should be aborted or filling-stagnated in complete pollination. The endoge-nous hormone and polyamine contents were compared between IcP and CP treatments during blister stage, and the relationship of sink activity with endogenous hormone and/or polyamine contents was analyzed. There was no remarkable effect of hybrids and years on sink activity, endogenous hormone and polyamine of kernels. The soluble acid invertase activity of IcP was significantly higher than that of CP, by 13.5% on an average and 21.8% at the maximum. There was no significant difference in contents of Z+ZR, IAA, GA3, and ABA of the inferior kernels between IcP and CP treatments during blister stage. The polyamine content of IcP was significantly higher than that of CP, but the ethylene producing rate was just the opposite. SAI activity correlated with polyamine content positively, but with ethylene release rate negatively, moreover, ethylene release rate showed negative correla-tion with polyamine content. The results suggested that, during the blister stage of maize, the contents of Z+ZR, IAA, GA3, and ABA of inferior kernels have nothing to do with SAI activity. SAI activity of inferior kernels is mainly affected by polyamine and ethylene, which is promoted by polyamine content and inhibited by ethylene release rate. The balance between polyamine and ethylene determines the result of inferior kernel development, which is radically regulated by assimilate supply of maize plant.关键词
玉米/弱势粒/库活性/激素/多胺Key words
Maize/Inferior kernel/Sink activity/Hormone/Polyamine引用本文复制引用
王志刚,魏淑丽,杨哲,梁红伟,高聚林,于晓芳,孙继颖,苏治军,胡树平,余少波,李雅剑..玉米弱势粒库活性与籽粒内源激素及多胺含量的关系[J].作物学报,2017,43(8):1196-1204,9.基金项目
本研究由国家自然科学基金项目(31301265), 国家重点研发计划项目(2016YFD0300103), 内蒙古自治区高等学校青年科技英才支持计划(NJYT-14-B04)和国家科技支撑计划项目(2013BAD07B04)资助.This study was supported by the National Natural Science Foundation of China (31301265), the State Program of China (2016YFD0300103), the Program for Young Talents of Science and Technology in Universities of Inner Mongolia Autonomous Region (NJYT-14-B04), and the National Key Technology Support Program of China (2013BAD07B04). （31301265）
