Premium
Role of Pseudomonas fluorescens and INA against Black Rot of Cabbage
Author(s) -
Umesha Sharanaiah,
Roohie Raheem K.
Publication year - 2017
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12558
Subject(s) - biology , pseudomonas fluorescens , xanthomonas campestris , brassica , black rot , xanthomonas campestris pv. campestris , superoxide dismutase , cultivar , peroxidase , brassica oleracea , horticulture , abiotic component , botany , antioxidant , enzyme , bacteria , gene , biochemistry , paleontology , genetics
Cabbage ( Brassica oleracea var. capitata ) is an important vegetable crop among crucifers. It is affected by a bacterial disease known as black rot. Black rot is caused by Xanthomonas campestris pv. campestris a disease of worldwide importance. The present study highlights the effect of biotic inducer— Pseudomonas fluorescens —and an abiotic inducer—2,6‐dichloro‐isonicotinic acid—in combating black rot, followed by their effect on the seed treatment and disease incidence, role of antioxidant enzymes followed by validation of the defence‐related genes by quantitative real‐time PCR. The resistant ( Pusa mukta ) and the highly susceptible ( NBH boss ) cabbage cultivars were analysed for defence‐related enzymes such as peroxidase and superoxide dismutase. An increase in total peroxidase and superoxide dismutase activity was observed upon inoculation with X . campestris pv. campestris . The activity was greater in resistant cultivar when compared to susceptible ones. Both enzyme activity assays and qPCR analyses for the expression of the defence genes in susceptible and resistant cultivars demonstrated that the peroxidase gene was up‐regulated in resistant cultivar compared to susceptible cultivar. The present study proved that P. fluorescens ‐induced resistance against X. campestris pv. campestris in cabbage seedlings is more efficient as compared to the use of INA—abiotic inducer.