Cytological and transcriptomic analysis to unveil the mechanism of web blotch resistance in Peanut

Author:

Wu Xiaohui,Sun Ziqi,Qi Feiyan,Liu Hua,Zhao Mingbo,Wang Juan,Wang Mengmeng,Zhao Ruifang,Wu Yue,Dong Wenzhao,Zheng Zheng,Zhang Xinyou

Abstract

Abstract Background Peanut is an important oil crop worldwide. Peanut web blotch is a fungal disease that often occurs at the same time as other leaf spot diseases, resulting in substantial leaf drop, which seriously affects the peanut yield and quality. However, the molecular mechanism underlying peanut resistance to web blotch is unknown. Results The cytological examination revealed no differences in the conidium germination rate between the web blotch-resistant variety ZH and the web blotch-susceptible variety PI at 12–48 hpi. The appressorium formation rate was significantly higher for PI than for ZH at 24 hpi. The papilla formation rate at 36 hpi and the hypersensitive response rate at 60 and 84 hpi were significantly higher for ZH than for PI. We also compared the transcriptional profiles of web blotch-infected ZH and PI plants at 0, 12, 24, 36, 48, 60, and 84 hpi using an RNA-seq technique. There were more differentially expressed genes (DEGs) in ZH and PI at 12, 36, 60, and 84 hpi than at 24 and 48 hpi. Moreover, there were more DEGs in PI than in ZH at each time-point. The analysis of metabolic pathways indicated that pantothenate and CoA biosynthesis; monobactam biosynthesis; cutin, suberine and wax biosynthesis; and ether lipid metabolism are specific to the active defense of ZH against YY187, whereas porphyrin metabolism as well as taurine and hypotaurine metabolism are pathways specifically involved in the passive defense of ZH against YY187. In the protein-protein interaction (PPI) network, most of the interacting proteins were serine acetyltransferases and cysteine synthases, which are involved in the cysteine synthesis pathway. The qRT-PCR data confirmed the reliability of the transcriptome analysis. Conclusion On the basis of the PPI network for the significantly enriched genes in the pathways which were specifically enriched at different time points in ZH, we hypothesize that serine acetyltransferases and cysteine synthases are crucial for the cysteine-related resistance of peanut to web blotch. The study results provide reference material for future research on the mechanism mediating peanut web blotch resistance.

Funder

Key Research Project of the Shennong Laboratory

Henan Provincial Science and Technology R&D Program Joint Fund (Superiority Discipline Cultivation) Project

Major Science and Technology Projects of Henan Province

China Agriculture Research System of MOF and MARA

Henan Provincial Agriculture Research System, China

Outstanding Young Scientists of Henan Academy of Agricultural Sciences

Special fund for Scientific and Technological Innovation Team of Henan Academy of Agricultural Sciences

Independent Innovation Project of the Henan Academy of Agricultural Sciences

Publisher

Springer Science and Business Media LLC

Subject

Plant Science

Reference89 articles.

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