| Title: | Differential effects of rhizobacteria from uninfected and infected tomato on Meloidogyne incognita under protected cultivation |
| Author(s): | Gowda MT; Prasanna R; Kundu A; Rana VS; Rao U; Chawla G; |
| Address: | "Division of Nematology, ICAR-Indian Agricultural Research Institute, New Delhi, India. Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India. Division of Agricultural Chemicals, ICAR-Indian Agricultural Research Institute, New Delhi, India" |
| ISSN/ISBN: | 1521-4028 (Electronic) 0233-111X (Linking) |
| Abstract: | "Intermingled uninfected and root-knot nematode-infected tomato plants are commonly observed under protected cultivation. To understand the role of rhizobacteria underlying the susceptibility to nematode infectivity in these tomato plants, 36 rhizobacteria (18 from each type) with morphologically distinct colony characteristics were isolated from the rhizosphere of uninfected and root-knot nematode-infected tomato plants. The in vitro nematicidal potential of rhizobacteria from the uninfected rhizosphere was significantly higher than that from the infested rhizosphere. The three most effective antagonists were identified as Microbacterium laevaniformans, Staphylococcus kloosii, Priestia aryabhattai from root-knot-nematode-infected tomato rhizosphere and Staphylococcus sciuri, Bacillus pumilus, and Priestia megaterium from the rhizosphere of uninfected tomato. Volatile organic compounds from these rhizobacteria were characterized. Except for S. kloosi, the soil drenching with other rhizobacteria significantly reduced juvenile penetration (>60%) in tomato roots. Furthermore, the application of a single or consortium of these rhizobacteria affected nematode reproduction in tomato. Four consortia of rhizobacteria (S. sciuri + B. pumilus + P. megaterium), (B. pumilus + P. megaterium), (S. sciuri + B. pumilus), and (S. sciuri + P. megaterium) from uninfested rhizosphere and two consortia (M. laevaniformans + P. aryabhattai), (M. laevaniformans + S. kloosii + P. aryabhattai) from infested rhizosphere (IRh) effectively reduced M. incognita reproduction and considerably enhanced plant growth and yield in tomato. The nematicidal efficacy, however, decreased when S. kloosii was applied in the consortium. These distinctive effects illustrate how the plant susceptibility to nematode infectivity is modulated under natural conditions" |
| Keywords: | Animals *Tylenchoidea/microbiology *Solanum lycopersicum Antinematodal Agents/pharmacology *Bacillus megaterium *Bacillus pumilus Meloidogyne incognita nematicidal activity protected cultivation rhizobacteria tomato; |
| Notes: | "MedlineGowda, Manjunatha T Prasanna, Radha Kundu, Aditi Rana, Virendra Singh Rao, Uma Chawla, Gautam eng Germany 2023/01/21 J Basic Microbiol. 2023 Jun; 63(6):604-621. doi: 10.1002/jobm.202200695. Epub 2023 Jan 20" |
