PIF8‐WRKY42‐mediated salicylic acid synthesis modulates red light induced powdery mildew resistance in oriental melon

Lixia Wang; Xutong Wu; Qiaojuan Xing; Bo Yu; Yue Ma; Feng Wang; Hongyan Qi

doi:10.1111/pce.14560

journal article Feb 19, 2023

PIF8‐WRKY42‐mediated salicylic acid synthesis modulates red light induced powdery mildew resistance in oriental melon

Lixia Wang

Qiaojuan Xing Bo Yu

Plant, Cell & Environment Vol. 46 No. 5 pp. 1726-1742 · Wiley

View at Publisher Save 10.1111/pce.14560

Abstract

AbstractLight signals and plant hormones are involved in regulating the growth, development and stress resistance of plants; however, it remains unclear whether light affects hormones and thus pathogen resistance in oriental melon. Here, we found that red light promoted salicylic acid (SA) accumulation and powdery mildew resistance by activating the transcription of CmICS, the key gene for SA biosynthesis, and silencing CmICS seriously weakened the induction effect of red light on powdery mildew resistance in oriental melon leaves. Further studies showed that red light induced the expression of CmWRKY42 under powdery mildew stress, and CmWRKY42 directly bound to the CmICS promoter to activate its expression and promote the accumulation of SA under red light. Furthermore, we found that PHYTOCHROME INTERACTING FACTOR 8 (PIF8), as a negative regulator of SA biosynthesis, inhibits CmWRKY42 transcriptional activation by binding to the CmWRKY42 promoter, and thus inhibits transcriptional activation of CmICS by CmWRKY42. Also, CmPIF8 binds to the CmICS promoter and directly inhibits its transcription. In conclusion, our study revealed a new molecular mechanism of the relationship between red light‐SA‐powdery mildew resistance and provided a theoretical basis for resistance breeding of oriental melon.

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Details

Published: Feb 19, 2023
Vol/Issue: 46(5)
Pages: 1726-1742
License: View

Authors

L

Lixia Wang

College of Horticulture Shenyang Agricultural University Shenyang China; Key Laboratory of Protected Horticulture of Education of Ministry and Liaoning Province/National & Local Joint Engineering Research Center of Northern Horticultural Facilities Design & Application Technology Shenyang China

X

Xutong Wu

College of Horticulture Shenyang Agricultural University Shenyang China; Key Laboratory of Protected Horticulture of Education of Ministry and Liaoning Province/National & Local Joint Engineering Research Center of Northern Horticultural Facilities Design & Application Technology Shenyang China

Q

Qiaojuan Xing

College of Horticulture Shenyang Agricultural University Shenyang China

B

Bo Yu

College of Horticulture Shenyang Agricultural University Shenyang China

Y

Yue Ma

College of Horticulture Shenyang Agricultural University Shenyang China

F

Feng Wang

College of Plant Protection Shenyang Agricultural University Shenyang China

H

Hongyan Qi

College of Horticulture Shenyang Agricultural University Shenyang China; Key Laboratory of Protected Horticulture of Education of Ministry and Liaoning Province/National & Local Joint Engineering Research Center of Northern Horticultural Facilities Design & Application Technology Shenyang China

Funding

National Natural Science Foundation of China

Cite This Article

Lixia Wang, Xutong Wu, Qiaojuan Xing, et al. (2023). PIF8‐WRKY42‐mediated salicylic acid synthesis modulates red light induced powdery mildew resistance in oriental melon. Plant, Cell & Environment, 46(5), 1726-1742. https://doi.org/10.1111/pce.14560

PIF8‐WRKY42‐mediated salicylic acid synthesis modulates red light induced powdery mildew resistance in oriental melon

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