- Integrated proteomic and metabolomic analyses reveal significant changes in chloroplasts and mitochondria of pepper (Capsicum annuum L.) during Sclerotium rolfsii infection
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Hongdong Liao , Xiangyu Wen , Xuelei Deng , Yonghong Wu , Jianping Xu , Xin Li , Shudong Zhou , Xuefeng Li , Chunhui Zhu , Feng Luo , Yanqing Ma , Jingyuan Zheng
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J. Microbiol. 2022;60(5):511-525. Published online March 31, 2022
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DOI: https://doi.org/10.1007/s12275-022-1603-4
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 Abstract
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Infection by Sclerotium rolfsii will cause serious disease and
lead to significant economic losses in chili pepper. In this
study, the response of pepper during S. rolfsii infection was
explored by electron microscopy, physiological determination
and integrated proteome and metabolome analyses. Our results
showed that the stomata of pepper stems were important
portals for S. rolfsii infection. The plant cell morphology
was significantly changed at the time of the fungal hyphae just
contacting (T1) or surrounding (T2) the pepper. The chlorophyll,
carotenoid, and MDA contents and the activities of
POD, SOD, and CAT were markedly upregulated at T1 and
T2. Approximately 4129 proteins and 823 metabolites were
clearly identified in proteome and metabolome analyses, respectively.
A change in 396 proteins and 54 metabolites in
pepper stem tissues was observed at T1 compared with 438
proteins and 53 metabolites at T2. The proteins and metabolites
related to photosynthesis and antioxidant systems in
chloroplasts and mitochondria were disproportionally affected
by S. rolfsii infection, impacting carbohydrate and amino
acid metabolism. This study provided new insights into the
response mechanism in pepper stems during S. rolfsii infection,
which can guide future work on fungal disease resistance
breeding in pepper.
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Citations
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