Nematicidal Potential of Streptomyces Antibioticus Strain M7 Against Meloidogyne Incognita

Overview

Journal AMB Express

Date 2019 Oct 24

PMID 31641879

Citations 10

Authors

Manish Sharma

Shivam Jasrotia

Puja Ohri

Rajesh Kumari Manhas

Affiliations

Soon will be listed here.

Abstract

Meloidogyne spp. are microscopic, obligatory endoparasites with worldwide distribution which cause severe damage to agricultural crops. The present study revealed the nematicidal activity of Streptomyces antibioticus strain M7 against Meloidogyne incognita. The culture supernatant of the isolate caused 100% J2 mortality after 24 h and inhibited egg hatching (only 3%). In addition, the nematicidal activity of actinomycins V, X and D purified from strain M7 was also checked. In vitro studies displayed 97.0-99.0% juvenile mortality and 28.0-44.0% egg hatching after 168 h at 240 µg/ml of actinomycin, with LD (lethal dose) values of 28-120 µg/ml. In vivo study further validated the nematicidal activity of strain M7, where nematode infested tomato plants treated with culture supernatant/cells/solvent extract showed reduction in root galls and egg masses per plant by 50.0-62.06% and 53.48-76.74%, respectively, and significantly enhanced the shoot length (54.67-76.39%), root length (36.45-64.88%), shoot fresh weight (111-171.77%), root fresh weight (120-163.33%), shoot dry weight (54.45-145.45%), and root dry weight (100-133.3%) over the nematode infested plants treated with water. Furthermore, tomato plants treated with cells/culture supernatant/extract of strain M7 without nematode infestation also showed significant increase in various plant growth parameters. Thus, the outcome of the study revealed the potential of S. antibioticus strain M7 and actinomycins produced from it to be developed as safe nematicidal agents to control the root knot nematodes, and to increase the crop yield.

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