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Plant growth‐promoting rhizobacteria and Trichoderma shift common vetch (Vicia sativa) physiology and phyllosphere bacteria toward antagonism against anthracnose caused by Colletotrichum spinaciae

Authors :
Rui Zhu
Wei Yan
Yajie Wang
Yingde Li
Rongchun Zheng
Wanqing Dong
Tuo Yao
Tingyu Duan
Source :
Grassland Research, Vol 3, Iss 3, Pp 275-289 (2024)
Publication Year :
2024
Publisher :
Wiley, 2024.

Abstract

Abstract Background Plant phyllosphere microbes are important for the host plant's protection. Plant growth‐promoting rhizobacteria (PGPR) and Trichoderma are common biocontrol agents (BCAs) for disease management. Pathogens and BCAs can change the rhizosphere microbial composition; however, the effect of PGPR or Trichoderma on plant phyllosphere microbes, particularly for mesocosms involving the interaction between pathogens and BCAs, is not well known. Methods High‐throughput sequencing was used to identify the phyllosphere bacterial community of common vetch interacting with Colletotrichum spinaciae, two PGPRs (Bacillus subtilis and Bacillus licheniformis), and Trichoderma longibrachiatum. We evaluated anthracnose severity, phyllosphere bacteria diversity and composition, and the relationship between the activities of plant defense enzymes and hormonal molecules in plants treated with individual and combined inoculations of PGPRs, Trichoderma, and C. spinaciae. Results PGPR or Trichoderma alone reduced disease severity. Trichoderma reduced the salicylic acid content, PGPR increased the catalase activity in plants, and co‐inoculation of PGPR and Trichoderma decreased the salicylic acid content. Inoculation of PGPR and Trichoderma individually or in combination changed the disease‐associated phyllosphere bacteria, and this effect was related to plant defense enzymes and hormonal molecules. Conclusions We suggest that the plant defense response induced by PGPR and Trichoderma results in the enrichment of a fraction of favorable chloroplastic bacteria, which facilitates plant defense against diseases.

Details

Language :
English
ISSN :
27701743 and 2097051X
Volume :
3
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Grassland Research
Publication Type :
Academic Journal
Accession number :
edsdoj.833e53570e784d7b9002b1d46d0b4c2e
Document Type :
article
Full Text :
https://doi.org/10.1002/glr2.12081