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Evaluation of microbial seed priming in relation to plant growth promotion and disease resistance in cucurbitaceous vegetables

KrishiKosh

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Title Evaluation of microbial seed priming in relation to plant growth promotion and disease resistance in cucurbitaceous vegetables
 
Creator T, Sivasankari Devi
 
Contributor M. K, Shivapraksh
 
Subject sowing, planting, diseases, fungi, seed treatment, enzymes, biological control, pathogens, germinability, biological development
 
Description Present investigation was undertaken to evaluate microbial seed priming in
relation to plant growth promotion and disease resistance in cucurbitaceous vegetables.
Fusarium, Pythium, and Rhizoctonia were the major disease causing fungal pathogens
isolated and purified. In vitro studies revealed that Trichoderma harzianum (PDBC-TH1)
and Pseudomonas fluorescens (PDBC-Pf1) showed highest percentage of growth
inhibition. Seeds priming of cucumber and gherkin with 50 mM KNO3 at 25°C for 24 hrs
enhanced plant growth under green house conditions. Similarly, seed priming with NaCl
50 mM for ridge gourd and NaCl 100 mM for bitter and bottle gourd at 25°C for 24 hrs
performed better.
The treatments T8 (microbial primed with (Az.c + B.m + P.f + T.h)) and T9
(microbial primed with (Az.b + B.m + P.f + T.h)) recorded the maximum plant growth
promoting activity. The level of plant growth hormones, viz., IAA and GA were higher in
microbial primed seeds than unprimed and hydroprimed seeds.
The activity of defense enzymes phenyl alanine ammonia lyase (PAL), polyphenol
oxidase (POP) and peroxidase (PO) were higher in T8 (microbial primed with (Az.c + B.m
+ P.f + T.h)) and T9 (microbial primed with (Az.b + B.m + P.f + T.h)). The expression total
phenol and activity of PR proteins chitinases and β-1,3 glucanase were high in the same
treatment. Green house and field experiments showed that the microbial primed seeds
performed well in growth as well as in yield parameters.
 
Date 2016-05-18T12:56:03Z
2016-05-18T12:56:03Z
2012-09-20
 
Type Thesis
 
Identifier Th-10386
http://krishikosh.egranth.ac.in/handle/1/66069
 
Language en
 
Format application/pdf
 
Publisher University of Agricultural Sciences, Bengaluru