PbEIL1 acts upstream of PbCysp1 to regulate ovule senescence in seedless pear  

作　　者：Huibin Wang Haiqi Zhang Fangfang Liang Liu Cong Linyan Song Xieyu Li Rui Zhai Chengquan Yang Zhigang Wang Fengwang Ma Lingfei Xu 

机构地区：[1]College of Horticulture,Northwest A&F University,Yangling,Shaanxi Province,China

出　　处：《Horticulture Research》2021年第1期818-829,共12页园艺研究（英文）

基　　金：the National Key R&D Program of China(2019YFD1001400);the China Agriculture Research System(CARS 28-45).

摘　　要：Numerous environmental and endogenous signals control the highly orchestrated and intricate process of plant senescence.Ethylene,a well-known inducer of senescence,has long been considered a key endogenous regulator of leaf and flower senescence,but the molecular mechanism of ethylene-induced ovule senescence has not yet been elucidated.In this study,we found that blockage of fertilization caused ovule abortion in the pear cultivar‘1913’.According to transcriptome and phytohormone content data,ethylene biosynthesis was activated by pollination.At the same time,ethylene overaccumulated in ovules,where cells were sensitive to ethylene signals in the absence of fertilization.We identified a transcription factor in the ethylene signal response,ethylene-insensitive 3-like(EIL1),as a likely participant in ovule senescence.Overexpression of PbEIL1 in tomato caused precocious onset of ovule senescence.We further found that EIL1 could directly bind to the promoter of the SENESCENCE-ASSOCIATED CYSTEINE PROTEINASE 1(PbCysp1)gene and act upstream of senescence.Yeast one-hybrid and dual-luciferase assays revealed the interaction of the transcription factor and the promoter DNA sequence and demonstrated that PbEIL1 enhanced the action of PbCysp1.Collectively,our results provide new insights into how ethylene promotes the progression of unfertilized ovule senescence.

关 键 词：endogenous SENESCENCE UPSTREAM 

分 类 号：Q94[生物学—植物学]