Environmental stresses are the major factors that limit productivity in plants. Here, wereport on the function of an uncharacterized geneAt1g07050, encoding a CCTdomain‐containing protein, fromArabidopsis thaliana. At1g07050expression is highlyrepressed b

OSELLA, AV; MEGARELLI, DA; MATEOS, JL; DONG, S; YANOVSKY, MJ; BALAZADEH, S; VALLE, E; ZANOR, MI

PLANT, CELL AND ENVIRONMENT (PRINT)

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 vol. 41 p. 2328 - 2341

0140-7791

Environmental stresses are the major factors that limit productivity in plants. Here, wereport on the function of an uncharacterized geneAt1g07050, encoding a CCTdomain‐containing protein, fromArabidopsis thaliana. At1g07050expression is highlyrepressed by oxidative stress. We used metabolomics, biochemical, and genomicapproaches to analyse performance of transgenic lines with altered expression ofAt1g07050under normal and oxidative stress conditions.At1g07050overexpressinglines showed increased levels of reactive oxygen species (ROS), whereas knock‐outmutants exhibited decreased levels of ROS and higher tolerance to oxidative stressgenerated in the chloroplast. Our results uncover a role forAt1g07050in cellularredox homeostasis controlling H2O2levels, due to changes in enzymes, metabolites,and transcripts related to ROS detoxification. Therefore, we call this geneFITNESS.Additionally, several genes such asACD6,PCC1, andICS1related to salicylic acid sig-nalling and defence were found differentially expressed among the lines. Notably, FIT-NESS absence significantly improved seed yield suggesting an effective fine‐tuningtrade‐off between reproductive success and defence responses