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Biocontrol potential of Pseudomonas azotoformans, Serratia marcescens and Trichoderma virens against Fusarium wilt of Dalbergia sissoo
Author(s) -
Banerjee Sabyasachi,
Singh Seema,
Pandey Shailesh,
Bhandari Maneesh S.,
Pandey Amit,
Giri Krishna
Publication year - 2020
Publication title -
forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 1437-4781
DOI - 10.1111/efp.12581
Subject(s) - biology , serratia marcescens , fusarium solani , fusarium wilt , microbiology and biotechnology , wilt disease , siderophore , chitinase , biological pest control , trichoderma , pseudomonas , mycelium , horticulture , serratia , antagonism , botany , bacteria , fusarium oxysporum , biochemistry , genetics , escherichia coli , gene , receptor
Wilt disease caused by Fusarium solani is a serious constraint to Dalbergia sissoo (shisham) plantations in northern India. In this study, the antagonistic potential of 40 bacterial isolates recovered from rhizophere soil of healthy shisham trees, and a well‐characterized Trichoderma species ( Trichoderma virens ) were tested for their possibility as biocontrol agents for F. solani . Two promising isolates (S1 and S15) were identified which inhibited pathogen growth, caused chitin degradation, produced siderophores and solubilized phosphate in vitro. Isolate S15 scored highest for hydrogen cyanide (HCN) production while isolate S1 was a non‐HCN producer. These two isolates were identified as Serratia marcescens (S1) and Pseudomonas azotoformans (S15) following sequence analysis of 16S rDNA. In dual culture assays, T. virens caused 80% inhibition of mycelial growth of the test fungus. The three selected antagonists when tested in planta in the glasshouse completely suppressed production of wilt symptoms on 12‐month‐old shisham plants. Further work is needed to ascertain the potential of these isolates to be used as biocontrol agents to manage shisham wilt under field conditions.