Physiological mechanism underlying spikelet degeneration in rice

作     者：WANG Zhi-qin ZHANG Wei-yang YANG Jian-chang 

作者机构：Key Laboratory of Crop Genetics and Physiology of Jiangsu Province/Innovation Center for Modern Production Technology of Grain Crops of Jiangsu Province Yangzhou University 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2018年第17卷第7期

页      面：1475-1481页

核心收录：

学科分类：09[农学] 0901[农学-作物学] 

基　　金：supported by the National Natural Science Foundation of China (31471438 and 31771710) the National High-Tech R&D Program of China (863 Program, 2014AA10A605) the National Key Research and Development Program of China (2016YFD0300206-4) the Priority Academic Program Development of Jiangsu Higher Education Institutions, China (PAPD) the Top Talent Supporting Program of Yangzhou University, China (2015-01) 

主　　题：rice(Oryza safiva) spikelet degeneration phytohormones brassinosteroids polyamines 

摘      要：The phenomenon of degenerated spikelets is very common in cereals, and considered as a serious physiological defect and a main constraint to grain production. Understanding the physiological mechanism in which spikelet degeneration occurs would have great significance in enhancing yield potential in grain crops. Taking rice as an example, the paper reviewed the physiological mechanism underlying spikelet degeneration, with focus on the roles of phytohormones in regulating the process. There are several hypotheses for the spikelet degeneration, such as resource limitation, self-organization, and primigenic dominance. However, convincing evidences are not enough to support the assumptions. Phytohormones including auxins, cytokinins, gibberellins, abscisic acid, and ethylene are involved in regulating spikelet degeneration in cereals. The new phytohormones of brassinosteroids and polyamines have been observed to suppress spikelet degeneration in rice. The interactions among or between plant hormones may play a more important role in regulating spikelet degeneration. However, the information on such interactions is very limited. Some agronomic practices, especially proper water and nitrogen management, could reduce spikelet degeneration but the mechanism underlying remains unclear. Further research is needed to understand the cross-talk among/between phytohormones on spikelet degeneration, to reveal the physiological and molecular mechanism in which phytohormones and their interactions regulate the degeneration of spikelets, to exploit approaches to decrease spikelet degeneration and to elucidate their mechanism.