Gibberellin Is Involved in the Regulation of Cell Death-mediated Apical Senescence in G2 Pea

作     者：Da-Yong Wang 

作者机构：Department of Genetics and Developmental Biology Southeast University Nanjing 210009 China Key Laboratory of Developmental Genes and Human Disease Ministry of Education Nanjing 210009 China The National Laboratory of Protein Engineering and Plant Genetic Engineering Beijing 100871 China College of Life Sciences Peking University Beijing 100871 China 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2007年第49卷第11期

页      面：1627-1633页

核心收录：

学科分类：09[农学] 0902[农学-园艺学] 090202[农学-蔬菜学] 

基　　金：Supported by the Southeast University Foundation for Excellent Young Scholars(4023001013) 

主　　题：apical senescence cell death gibberellin photoperiod Pisum G2. 

摘      要：Senescence is the process of programmed degradation. The G2 line of pea exhibits apical senescence-delaying phenotype under short-day （SD） conditions, but the mechanism regulating the apical senescence is still largely unknown. Gibberellin （GA） was proved to be able to delay this apical senescence phenotype in G2 pea grown under long-day （LD） conditions. Here we show that the initiation of cell death signals in the terminal floral meristem was involved in the regulation of apical senescence in pea plants. SD signals prevented the formation of the cell death region in the apical mersitem. Moreover, GA3 treatment could effectively inhibit the occurrence of cell death-mediated apical senescence in LD-grown apical buds. Therefore, our data suggest that the prevention of apical senescence in SD-grown G2 pea through GA3 treatment may be largely responsible for the regulation of occurrence of the DNA fragmentation in apical meristem.