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Combined Transcriptomic and Metabolomic Analyses of Defense Mechanisms against Phytoplasma Infection in Camptotheca acuminata Decne

Author

Listed:
  • Kai Qiao

    (Phytopathology Laboratory of Yunnan Province, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China)

  • Weiyi Huang

    (Phytopathology Laboratory of Yunnan Province, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China)

  • Xuemei Li

    (Phytopathology Laboratory of Yunnan Province, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China)

  • Jiahui Liang

    (Phytopathology Laboratory of Yunnan Province, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China)

  • Hong Cai

    (Phytopathology Laboratory of Yunnan Province, College of Plant Protection, Yunnan Agricultural University, Kunming 650201, China)

Abstract

Camptotheca acuminata Witches’-broom disease (CaWB) is the most destructive disease affecting C. acuminata in China. Previous studies on CaWB have failed to clarify the incidence pattern in C. acuminata after infection with phytoplasma. The time interval between phytoplasma infection of C. acuminata and the onset of Witches’-broom symptoms in C. acuminata was very long. C. acuminata inoculated with CaWB showed leaf margin scorching symptoms at 4 weeks in inoculated leaves. At 16 weeks after infection (WAI), old leaves were shed, while new leaves showed a mild leaf margin scorch; at 28 WAI, typical symptoms appeared. Transcriptomic and metabolomic analyses of the three sampling periods revealed 194 differentially expressed genes, mainly enriched in MAPK signaling, plant–pathogen interaction, phenylpropanoid biosynthesis, starch and phenylpropanoid biosynthesis, and phenylpropanoid biosynthesis pathways. The expression of calcium-dependent protein kinase (CDPK), β Ketoacyl-CoA Synthase1/10 (KCS1/10), and WRKY22/29 genes in the plant–pathogen interaction pathway significantly increased, indicating that they may be key genes in the CaWB phytoplasma-mediated maintenance of ROS homeostasis. Moreover, isochlorogenic acid B, atractylenolide II, and 3-methoxybenzoic acid were found, which might serve as signaling or functional substances in the defense response. Our results provide novel insights into the pathogenesis of CaWB and the defense response of C. acuminata under the influence of phytoplasma. Additionally, we identified potential candidate genes related to the defense response of C. acuminata , laying the foundation for further research.

Suggested Citation

  • Kai Qiao & Weiyi Huang & Xuemei Li & Jiahui Liang & Hong Cai, 2023. "Combined Transcriptomic and Metabolomic Analyses of Defense Mechanisms against Phytoplasma Infection in Camptotheca acuminata Decne," Agriculture, MDPI, vol. 13(10), pages 1-20, October.
    • Handle: RePEc:gam:jagris:v:13:y:2023:i:10:p:1943-:d:1253935
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    References listed on IDEAS

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    1. Shivesh Kumar & Raul Zavaliev & Qinglin Wu & Ye Zhou & Jie Cheng & Lucas Dillard & Jordan Powers & John Withers & Jinshi Zhao & Ziqiang Guan & Mario J. Borgnia & Alberto Bartesaghi & Xinnian Dong & Pe, 2022. "Structural basis of NPR1 in activating plant immunity," Nature, Nature, vol. 605(7910), pages 561-566, May.
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