A peroxisomal cinnamate:CoA ligase-dependent phytohormone metabolic cascade in submerged rice germination

Dev Cell. 2024 Apr 2:S1534-5807(24)00191-6. doi: 10.1016/j.devcel.2024.03.023. Online ahead of print.ABSTRACTThe mechanism underlying the ability of rice to germinate underwater is a largely enigmatic but key research question highly relevant to rice cultivation. Moreover, although rice is known to accumulate salicylic acid (SA), SA biosynthesis is poorly defined, and its role in underwater germination is unknown. It is also unclear whether peroxisomes, organelles essential to oilseed germination and rice SA accumulation, play a role in rice germination. Here, we show that submerged imbibition of rice seeds induces SA accumulation to promote germination in submergence. Two submergence-induced peroxisomal Oryza sativa cinnamate:CoA ligases (OsCNLs) are required for this SA accumulation. SA exerts this germination-promoting function by inducing indole-acetic acid (IAA) catabolism through the IAA-amino acid conjugating enzyme GH3. The metabolic cascade we identified may potentially be adopted in agriculture to improve the underwater germination of submergence-intolerant rice varieties. SA pretreatment is also a promising strategy to improve submerged rice germination in the field.PMID:38579719 | DOI:10.1016/j.devcel.2024.03.023

Source: Developmental Cell - April 5, 2024 Category: Cytology Authors: Yukang Wang Gaochen Jin Shuyan Song Yijun Jin Xiaowen Wang Shuaiqi Yang Xingxing Shen Yinbo Gan Yuexing Wang Ran Li Jian-Xiang Liu Jianping Hu Ronghui Pan Source Type: research