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Biochemical and physiological inferences of elicitors in Brassica in inducing resistance against Alternaria blight

KrishiKosh

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Title Biochemical and physiological inferences of elicitors in Brassica in inducing resistance against Alternaria blight
 
Creator Thakur, Meenakhi
 
Contributor Sohal, B.S.
 
Subject planting, diseases, acidity, enzymes, fungi, biological phenomena, organic acids, proteins, pathogens, organic acid salts
 
Description Role of elicitors viz., salicylic acid (SA) and benzothiadiazole (BTH) on induction of resistance to combat Alternaria blight in Brassica juncea (cv. PBR-91) and B. napus (cv. GSC-6) was studied. Field trials were conducted in 2011-12 and 2012-13 to investigate the effect of different concentrations of elicitors on antioxidative enzymes viz., peroxidase (PO), phenylalanine ammonia lyase (PAL), superoxide dismutase (SOD); pathogenesis related (PR) proteins viz., chitinase, β-1,3-glucanase; phenolics; pigments; ascorbic acid and sugars in both Brassica species. Elicitor treatments enhanced the activities of defense related enzymes and phenolic contents as compared to water sprayed control plants. Elicitor treatments also exhibited maximum contents of photosynthetic pigments, ascorbic acid, total soluble protein, free amino acids, total sugars and reducing sugars than control in both the species. Among all the elicitor treatments, combinations of elicitors, i.e., BTH (3 ppm) + SA (33 ppm) and BTH (7 ppm) + SA (17 ppm), were most effective. Treatments with combinations of elicitors showed increase in seed oil, total soluble protein and glucosinolate content as compared to control. These treatments were more pronounced in increasing plant height, internodal distance and number of pods per plant in both the Brassica species. Disease severity was less in plants treated with the combinations of elicitors. Treatment containing BTH (3 ppm) + SA (33 ppm) exhibited 28.35% increase in seed yield in B. juncea, whereas BTH (7 ppm) + SA (17 ppm) exhibited 27.12% increase in seed yield in B. napus as compared to water sprayed control plants. The decrease in disease severity and increase in seed yield might be attributed to the role played by defense related enzymes and phenolics. It is a well-known fact that elicitors viz., BTH and SA play an important role in enhancing the defense mechanism of plants. In addition to this, our study suggested that elicitors when applied in combinations, show synergistic effect on elicitation of defense response in B. juncea (cv. PBR-91) and B. napus (cv. GSC-6) against Alternaria blight.
 
Date 2016-04-12T09:20:39Z
2016-04-12T09:20:39Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65427
 
Language en
 
Format application/pdf
 
Publisher PAU