HbCOI1 perceives jasmonate to trigger signal transduction in Hevea brasiliensis

Abstract

Natural rubber, a strategically essential raw material used in manufacturing throughout the world, is produced from coagulated and refined latex of rubber tree (Hevea brasiliensis). It is known that phytohormone jasmonate (JA) plays an essential role in regulating latex biosynthesis. However, it is unclear how the JA signal is sensed in a rubber tree. Here, we showed that Hevea brasiliensis CORONATINE-INSENSITIVE 1 (HbCOI1) acts as a receptor that perceives JA to recruit HbJAZ1 for signal transduction. We found that HbCOI1 restores male sterility and JA responses of the coi1–1 mutant in Arabidopsis. The identification of a JA receptor in the rubber tree is essential for elucidating the molecular mechanisms underlying JA-regulated latex biosynthesis. Our results elucidate the mechanism of JA perception in Hevea brasiliensis and also provide an efficient strategy to identify JA receptors in woody plants.

The intragenic suppressor mutation Leu59Phe compensates for the effect of detrimental mutations in the jasmonate receptor COI1

“…COI1 or its orthologs are JA receptors essential for plant growth, development, and defense responses (Katsir et al ., 2008; Sheard et al ., 2010; Xie et al ., 1998; Yan et al ., 2009) in Arabidopsis (Feys et al ., 1994), rice (Lee et al ., 2015; Lee et al ., 2013; Yang et al ., 2012; Ye et al ., 2012), tomato (Li et al ., 2004), rubber tree (Chen et al ., 2020), and the bryophyte Marchantia polymorpha (Bowman et al ., 2017; Han, 2017; Monte et al ., 2018; Monte et al ., 2020). Previous studies have reported harmful amino acid mutations of COI1 (Sheard et al ., 2010; Yan et al ., 2009), whereas the amino acid mutations that could compensate for the effect of COI1 variants with detrimental mutations remain to be elucidated.…”

Emerging role of jasmonic acid in woody plant development

“…Moreover, in Ginkgo billoba , JAZ s are downregulated in ovule and promote the secretion of pollination drops, contributing to the pollination process (Che et al , 2021). Importantly, Chen et al (2021a) found that HbCOI1 , a receptor that perceives JA, could restore male sterility and the JA response of the coi1-1 mutant inArabidopsis , implicating that they almost share a common functional JA-Ile receptor and transcriptional inhibitor JAZs to fulfil reproductive processes in herbaceous and woody plants.…”