Novel flavin-containing monooxygenase protein FMO1 interacts with CAT2 to negatively regulate drought tolerance through ROS homeostasis and ABA signaling pathway in tomato

被引：17

作者：

Wang, Lulu ^{[1
,2
]}

Zhou, Yinlian ^{[1
,2
]}

Ding, Yin ^{[1
,2
]}

Chen, Chunrui ^{[1
,2
]}

Chen, Xueting ^{[1
,2
]}

Su, Nini ^{[1
,2
]}

Zhang, Xingguo ^{[1
,2
]}

Pan, Yu ^{[1
,2
]}

Li, Jinhua ^{[1
,2
]}

机构：

[1] Southwest Univ, Acad Agr Sci, State Cultivat Base Crop Stress Biol Southern Mou, Chongqing 400715, Peoples R China

[2] Southwest Univ, Coll Hort & Landscape Architecture, Key Lab Agr Biosafety & Green Prod Upper Yangtze, Minist Educ, Chongqing 400715, Peoples R China

来源：

HORTICULTURE RESEARCH | 2023年 / 10卷 / 04期

基金：

中国国家自然科学基金;

关键词：

OSMOTIC-STRESS; PHOSPHATASE; 2C; GENE; BIOSYNTHESIS; EXPRESSION; MECHANISM; NETWORK; KINASES; FAMILY; ENZYME;

D O I：

10.1093/hr/uhad037

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Drought stress is the major abiotic factor that can seriously affect plant growth and crop production. The functions of flavin-containing monooxygenases (FMOs) are known in animals. They add molecular oxygen to lipophilic compounds or produce reactive oxygen species (ROS). However, little information on FMOs in plants is available. Here, we characterized a tomato drought-responsive gene that showed homology to FMO, and it was designated as FMO1. FMO1 was downregulated promptly by drought and ABA treatments. Transgenic functional analysis indicated that RNAi suppression of the expression of FMO1 (FMO1-Ri) improved drought tolerance relative to wild-type (WT) plants, whereas overexpression of FMO1 (FMO1-OE) reduced drought tolerance. The FMO1-Ri plants exhibited lower ABA accumulation, higher levels of antioxidant enzyme activities, and less ROS generation compared with the WT and FMO1-OE plants under drought stress. RNA-seq transcriptional analysis revealed the differential expression levels of many drought-responsive genes that were co-expressed with FMO1, including PP2Cs, PYLs, WRKY, and LEA. Using Y2H screening, we found that FMO1 physically interacted with catalase 2 (CAT2), which is an antioxidant enzyme and confers drought resistance. Our findings suggest that tomato FMO1 negatively regulates tomato drought tolerance in the ABA-dependent pathway and modulates ROS homeostasis by directly binding to SlCAT2.

引用

页数：13