Tomato SlMETS1 positively regulates cold stress tolerance by involving ABA biosynthesis
Zixi Liu | Ying Chen | Qinglin Xiang | Tao Wang | Lihong Gao | Wenna Zhang
Low temperature stress has severe detrimental effects on plant growth and crop yield. While the role of phytohormone ABA in regulating cold stress tolerance has been recognized, its underlying regulation mechanisms remain poorly understood. Here, we investigate the involvements of SlMETS1 (Methionine Synthase 1) and SlABO5/6 (ABA Overly-Sensitive 5/6) in response to low temperature stress, and their reliance on the abscisic acid (ABA) pathways using wild-type tomato (WT) and ABA defective mutants not (notabilis) and sit (sitiens). Our findings reveal that cold stress influences the expression of SlMETS1, SlABO5, and SlABO6. The sit mutant exhibits similar expression tendency to the WT. However, the not mutant shows distinctive expression patterns of these three genes. In fact, they respond more rapidly and earlier to cold stress in not compared to the WT and sit. SlMETS1 inhibition by virus-induced gene silencing (VIGS) leads to cold stress sensitivity, resembling ABA defective mutants. These discoveries suggest an association of SlMETS1, SlABO5, and SlABO6 with SlNCED in the ABA biosynthesis and signaling pathways during cold stress, providing new molecular evidence for the relevance between methionine synthesis, ABA signaling, cold tolerance and shoot-root communication in plants.
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