An orchestrated ethylene-gibberellin signaling cascade contributes to mesocotyl elongation and emergence of rice direct seeding

作     者：Yusong Lyu Xinli Dong Shipeng Niu Ruijie Cao Gaoneng Shao Zhonghua Sheng Guiai Jiao Lihong Xie Shikai Hu Shaoqing Tang Xiangjin Wei Peisong Hu 

作者机构：State Key Laboratory of Rice Biology and BreedingChina National Center for Rice ImprovementChina National Rice Research InstituteHangzhou 310006China College of Agriculture and BiotechnologyZhejiang UniversityHangzhou 310058China 

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

年 卷 期：2024年第66卷第7期

页      面：1427-1439页

核心收录：

学科分类：0710[理学-生物学] 09[农学] 0901[农学-作物学] 

基　　金：supported by the National Natural Science Foundation of China(32188102 and 32101763) Zhejiang Provincial Science and Technology Project(2020R51007) the Key Research and Development Program of Zhejiang province(2022C02011) the Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-CACB-202402) 

主　　题：rice(Oryza sativa L.) direct seeding Green Revolu-tion mesocotyl elongation ethylene gibberellin semi-dwarf1(SD1) 

摘      要：A mechanized direct seeding of rice with less labor and water usage,has been widely ***,this approach requires varieties that exhibit uniform seedling *** elongation(ME)offers the main drive of fast emergence of rice seedlings from soils;nevertheless,its genetic basis remains ***,we identify a major rice quantitative trait locus Mesocotyl Elongation1(qME1),an allele of the Green Revolution gene Semi-Dwarf1(SD1),encoding GA20-oxidase for gibberellin(GA)***1 expression is strongly induced by soil depth and *** rice grains are direct-seeded in soils,the ethylene core signaling factor OsEIL1 directly promotes ME1 transcription,accelerating bioactive GA *** GAs further degrade the DELLA protein SLENDER RICE 1(SLR1),alleviating its inhibition of rice PHYTOCHROME-INTERACTING FACTOR-LIKE13(OsPIL13)to activate the downstream expansion gene OsEXPA4 and ultimately promote rice seedling ME and *** ancient traits of long mesocotyl and strong emergence ability in wild rice and landrace were gradually lost in company with the Green Revolution dwarf breeding process,and an elite ME1-R allele(D349H)is found in some modern Geng varieties(long mesocotyl lengths)in northern China,which can be used in the direct seeding and dwarf breeding of Geng ***,the ectopic and high expression of ME1 driven by mesocotyl-specific promoters resulted in rice plants that could be direct-seeded without obvious plant architecture or yield ***,we reveal the molecular mechanism of rice ME,and provide useful information for breeding new Green Revolution varieties with long mesocotyl suitable for direct-seeding practice.