Plant growth promoting rhizobacteria (PGPR) and entomopathogenic fungus bioformulation enhance the expression of defense enzymes and pathogenesis-related proteins in groundnut plants against leafminer insect and collar rot pathogen

The signaling pathways induced by Pseudomonas putida in rice plants at the early plant–rhizobacteria interaction stages, with and without inoculation of Xanthomonas oryzae pv. oryzae, were studied. In the absence of pathogen, P. putida reduced ethylene (ET) production, and promoted root and stem elongation. Interestingly, gene OsHDA702, which plays an important role in root formation, was found significantly up-regulated in the presence of the rhizobacterium. Although X. oryzae pv. oryzae inoculation enhanced ET production in rice plants, P. putida treatment repressed ET-, jasmonic acid (JA)- and salicylic acid (SA)-mediated defense pathways, and induced the biosynthesis of abscisic acid (ABA), and the overexpression of OsHDA705 and some pathogenesis-related proteins (PRs), which in turn increased the susceptibility of the rice plants against the pathogen. Collectively, this is the first work on the defense signaling induced by plant growth-promoting rhizobacteria in plants at the early interaction stages, and suggests that rhizobacteria stimulate an alternative defense mechanism in plants based on ABA accumulation and OsHDA705 signaling.

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Defense enzymes induced in cucumber roots by treatment with plant growth-promoting rhizobacteria (PGPR) and Pythium aphanidermatum

Physiological and Molecular Plant Pathology ◽

10.1006/pmpp.1999.0243 ◽

2000 ◽

Vol 56 (1) ◽

pp. 13-23 ◽

Cited By ~ 288

Author(s):

CHUNQUAN CHEN ◽

RICHARD R. BÉLANGER ◽

NICOLE BENHAMOU ◽

TIMOTHY C. PAULITZ

Keyword(s):

Plant Growth ◽

Plant Growth Promoting Rhizobacteria ◽

Pythium Aphanidermatum ◽

Defense Enzymes ◽

Plant Growth Promoting ◽

Cucumber Roots ◽

Growth Promoting

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Effect of Plant Growth Promoting Rhizobacteria (PGPR) on Increasing the Activity of Defense Enzymes in Tomato Plants

International Journal of Environment Agriculture and Biotechnology ◽

10.22161/ijeab.56.9 ◽

2020 ◽

Vol 5 (6) ◽

pp. 1474-1479

Author(s):

Fadhila Rahmi Joni ◽

Hasmiandy Hamid ◽

Yulmira Yanti

Keyword(s):

Plant Growth ◽

Plant Growth Promoting Rhizobacteria ◽

Defense Enzymes ◽

Tomato Plants ◽

Plant Growth Promoting ◽

Growth Promoting

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Management of Collar Rot of Chickpea (Cicer Arietinum) by Trichoderma Harzianum and Plant Growth Promoting Rhizobacteria

Journal of Plant Protection Research ◽

10.2478/v10045-008-0044-3 ◽

2008 ◽

Vol 48 (3) ◽

pp. 347-354 ◽

Cited By ~ 3

Author(s):

S. Maurya ◽

Rashmi Singh ◽

D. Singh ◽

H. Singh ◽

U. Singh ◽

...

Keyword(s):

Plant Growth ◽

Disease Control ◽

Cicer Arietinum ◽

Trichoderma Harzianum ◽

Foliar Application ◽

Plant Growth Promoting Rhizobacteria ◽

Plant Mortality ◽

Collar Rot ◽

Plant Growth Promoting ◽

Growth Promoting

Management of Collar Rot of Chickpea (Cicer Arietinum) byTrichoderma Harzianumand Plant Growth Promoting RhizobacteriaCollar rot (Sclerotium rolfsii) of chickpea (Cicer arietinum) is one of the devastating soil-borne diseases of fungal origin, due to which 10-30% yield loss is recorded annually according to severity of the disease. Management of collar rot of chickpea is not feasible in the absence of effective soil fungicides. However,Trichoderma harzianumand plant growth promoting rhizobacteria (PGPR) have shown high efficacy against this diseasein vitroas well as in the field. We usedT. harzianum(104, 106and 108spore/ml) and two PGPRs (Pseudomonas fluorescensstrain 4 andP. aeruginosa) as foliar spray with the fresh and heat inactivated microorganisms. Foliar application ofT. harzianum(108spore/ml) andP. fluorescensstrain 4 (108cfu/ml) showed maximum efficacy in reducing plant mortality as compared to the control. Foliar application of fresh-and heat-inactivated (121°C for 10 min)P. fluorescensstrain 4, andT. harzianumreduced 15-25% plant mortality butP. aeruginosashowed very little disease control of 10-15%. However, regarding plant growth promotion, it was observed that fresh-and heat-inactivatedP. fluorescensstrain 4 showed maximum efficacy followed by fresh and heat inactivatedP. aeruginosaandT. harzianumas compared to the control. The disease-controlling efficacy was also associated with the increase in phenolic acid synthesis in chickpea plants. The control of chickpea collar rot by biocontrol agents is safe and ecologically sound and appears to be a healthy approach to the disease control.

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