渗吸
发芽
脱落酸
苗木
生物
水稻
植物
非生物胁迫
作者
Linlin Sun,Zheng Yuan,Duoxiang Wang,Jingbin Li,Jin Shi,Yangyang Hu,Jing Yu,Xiaofei Chen,Sixue Chen,Wanqi Liang,Dabing Zhang
出处
期刊:Plant Physiology
[Oxford University Press]
日期:2021-12-04
卷期号:187 (4): 2405-2418
标识
DOI:10.1093/plphys/kiab391
摘要
Seed germination is critical for plant survival and agricultural production, which is affected by both internal seed factors and external environmental conditions. However, the genetic basis and underlying molecular mechanisms of early seed germination in crops remain largely unclear. Here, we report that R2R3 MYB transcription factor Carbon Starved Anther (CSA) is expressed specifically in Oryza sativa embryo and aleurone in response to seed imbibition, peaking at 3-6 h and undetectable by 24-h post-imbibition. CSA seeds germinated more quickly than wild-type rice seeds and had higher levels of amylase activity, glucose, and inactive abscisic acid-glucose ester (ABA-GE), but lower levels of ABA. Through analyzing the CSA-associated transcriptome and CSA binding to downstream target genes, we identified two glycolytic genes as direct CSA targets. CSA inhibits Amylase 3A expression to limit glucose production from starch and activates Os3BGlu6 expression to promote de-conjugation of ABA-GE to ABA; these functions serve to slow germination and improve seedling resilience to abiotic stress in the first 3 weeks of growth. Therefore, this study unveils a protection mechanism conferred by CSA during early seed germination by balancing glucose and ABA metabolism to optimize seed germination and stress response fitness.
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