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

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外文摘要：A mechanized direct seeding of rice with less labor and water usage,has been widely adopted.However,this approach requires varieties that exhibit uniform seedling emergence.Mesocotyl elongation(ME)offers the main drive of fast emergence of rice seedlings from soils;never-theless,its genetic basis remains unknown.Here,we identify a major rice quantitative trait locus Mesocotyl Elongation1(qME1),an allele of the Green Revolution gene Semi-Dwarf 1(SD1),en-coding GA20-oxidase for gibberellin(GA)bio-synthesis.ME1 expression is strongly induced by soil depth and ethylene.When rice grains are direct-seeded in soils,the ethylene core signaling factor OsEIL1 directly promotes ME1 tran-scription,accelerating bioactive GA biosynthesis.The 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 pro-mote rice seedling ME and emergence.The an-cient traits of long mesocotyl and strong emer-gence ability in wild rice and landrace were gradually lost in company with the Green Revo-lution 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 varieties.Fur-thermore,the ectopic and high expression of ME1 driven by mesocotyl-specific promoters re-sulted in rice plants that could be direct-seeded without obvious plant architecture or yield pen-alties.Collectively,we reveal the molecular mechanism of rice ME,and provide useful in-formation for breeding new Green Revolution varieties with long mesocotyl suitable for direct-seeding practice.

外文关键词：

rice(Oryza sativa L.)direct seedingGreen Revolu-tionmesocotyl elongationethylenegibberellinsemi-dwarf1(SD1)

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

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作者单位：

State Key Laboratory of Rice Biology and Breeding,China National Center for Rice Improvement,China National Rice Research Institute,Hangzhou 310006,China

College of Agriculture and Biotechnology,Zhejiang University,Hangzhou 310058,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaZhejiang Provincial Science and Technology ProjectKey Research and Development Program of Zhejiang provinceInnovation Program of Chinese Academy of Agricultural Sciences

项目编号：

32188102321017632020R510072022C02011CAAS-CACB-202402

出版年：

2024

DOI：

10.1111/jipb.13671

植物学报(英文版)

中国植物学会

植物学报(英文版)

CSTPCD

影响因子：0.921

ISSN：1672-9072

年,卷(期)：2024.66(7)