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当前位置: 首页 > 文章 > Isochorismate synthase is required for phylloquinone, but not salicylic acid biosynthesis in rice 生物技术通报(英文版) 2024
Position: Home > Articles > Isochorismate synthase is required for phylloquinone, but not salicylic acid biosynthesis in rice aBIOTECH 2024

Isochorismate synthase is required for phylloquinone, but not salicylic acid biosynthesis in rice

作  者：
Z. Wang;Guoren Yang;Dandan Zhang;Guangxin Li;Jian Qiu;Jie W
关键词：
ics;phylloquinone;osics;pathway;sa;mutant
摘  要：
Abstract Salicylic acid (SA) is a phytohormone required for plant growth and defense signaling. There are two major SA biosynthesis pathways in plants: the isochorismate synthase (ICS) pathway and the phenylalanine ammonia-lyase (PAL) pathway. It has been demonstrated in several plant species, including the model plant Arabidopsis , that SA is derived predominantly from the ICS pathway. Here, we employed the CRISPR/Cas9 system to generate ICS knockout mutants in rice ( Oryza sativa L.). The Osics mutants display severe growth defects, and are completely devoid of phylloquinone, an isochorismate-derived product. The growth defects of Osics can be rescued through exogenous application of 1,4-dihydroxy-2-naphthoic acid (NA), a precursor of phylloquinone. Remarkably, the basal SA levels are not altered in the Osics mutants. Our findings support a role of OsICS in the biosynthesis of phylloquinone, and imply that SA biosynthesis in rice may occur through an alternative route other than the ICS pathway.

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