Proposed working model demonstrating the positive regulatory function of PpMYC2.1 in improving cold tolerance. (IMAGE)

Nanjing Agricultural University The Academy of Science

Proposed working model demonstrating the positive regulatory function of PpMYC2.1 in improving cold tolerance.

Caption

Proposed working model demonstrating the positive regulatory function of PpMYC2.1 in improving cold tolerance. Under cold stress conditions, PpJAZ2 and PpJAZ4 physically interact with PpMYC2.1, suppressing its transcriptional activation of downstream genes and thereby inhibiting JA signaling. This repression leads to reduced expression of downstream genes and exacerbates CI symptoms in peach fruit. However, exogenous MeJA treatment downregulates the expression of PpJAZ2 and PpJAZ4, thereby alleviating their inhibitory effects on PpMYC2.1. As a result, JA signaling triggers the expression of downstream genes involved in ethylene biosynthesis, fruit softening, and polyphenol/flavonoid synthesis, ultimately enhancing the cold tolerance of peach fruit.

Credit

Horticulture Research

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