CHARACTERIZATION OF BLACKGRAM (Vigna mungo (L.) Hepper) GENOTYPES FOR TOLERANCE TO YELLOW MOSAIC VIRUS (YMV) AND NUTRITIONAL INTERVENTIONS TO ENHANCE TOLERANCE

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dc.contributor.advisorRAJA RAJESWARI, V
dc.contributor.authorRAJITHA, B
dc.date.accessioned2019-05-02T09:33:30Z
dc.date.available2019-05-02T09:33:30Z
dc.date.issued2018
dc.descriptionD5705en_US
dc.description.abstractA field experiment entitled “Characterization of blackgram (Vigna mungo L. Hepper) genotypes for tolerance to yellow mosaic virus (YMV) and nutritional interventions to enhance tolerance” was conducted at crop physiology laboratory (Lab study) and dryland farm (Field study), Sri Venkateswara Agricultural College, Tirupati. The blackgram genotypes (5 known tolerant + 5 known susceptible) obtained from Regional Agricultural Research Station, Lam farm, Guntur and Regional Agricultural Research Station, Tirupati were characterized under field conditions for YMV tolerance during rabi 2016-17 and summer 2017. Both susceptible and tolerant blackgram genotypes differed in their response to YMV infection in terms of morphological, physiological, biochemical, yield, nutrients and disease related characters. Among the five known tolerant blackgram genotypes, Cv. TBG-104 showed higher tolerance while Cv. LBG-623 was highly susceptible in five known susceptible group. Correlation studies revealed that significant negative relation of growth parameters and trichome density with percentage of disease incidence, whereas plant height and leaf lamina thickness established positive correlation. Based on results obtained a set of two blackgram genotypes i.e. one most susceptible (LBG-623) and other most tolerant (TBG- 104) genotypes were selected and laboratory experiment was conducted to identify safer Name of the Author : B. RAJITHA Title of the Thesis : CHARACTERIZATION OF BLACKGRAM (Vigna mungo (L.) Hepper) GENOTYPES FOR TOLERANCE TO YELLOW MOSAIC VIRUS (YMV) AND NUTRITIONAL INTERVENTIONS TO ENHANCE TOLERANCE Major Advisor : Dr. V. RAJA RAJESWARI Degree to which it is submitted : DOCTOR OF PHILOSOPHY Faculty : AGRICULTURE Major field : CROP PHYSIOLOGY University : ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY Year of submission : 2018 xxiv concentrations of nano scale oxide particles of Zn, Mg and Fe for blackgram through seed treatment. Among the various nano scale concentrations, nano scale Zinc Oxide @ 200 ppm, nano scale Magnesium Oxide @ 100 ppm and nano scale Iron Oxide @ 200 ppm recorded higher seedling vigour index (SVI) in terms of higher germination percentage and seedling growth in both the genotypes. These concentrations were selected for further evaluation of improving tolerance to yellow mosaic virus and yield under field condition. A field study was conducted during summer 2018 with two blackgram genotypes (TBG-104 and LBG-623) and nine treatments as foliar sprays including water spray control and replicated thrice in split-plot design. YMV infection was observed at 30 DAS. The foliar treatmental sprays were imposed at 30 and 50 DAS. Growth and physiological traits viz. plant height, leaf area, total drymatter, leaf area index (LAI) and leaf area duration (LAD), specific leaf weight (SLW) were found reduced in susceptible genotype (LBG-623) as compared to tolerant genotype (TBG-104) whereas leaf lamina thickness increased in susceptible genotype (LBG-623). Bulk and nano scale combined treatmental sprays and bulk MgSO4 @ 0.2% and nano scale Magnesium Oxide @ 100 ppm maintained significantly higher leaf area, dry matter and superior physiological traits viz., LAI, LAD and SLW and also greater SCMR compared to control. These treatmental sprays also recorded higher YMV tolerance interms of high SCMR, higher chlorophyll content, total phenols, total proteins, accumulation catalase enzyme, which denotes the efficiency of these treatments in enhancing YMV tolerance. Computing yield advantage and cost benefit ratio of foliar spray treatments for YMV tolerance, combined application of bulk ZnSO4 @ 0.2% + MgSO4 @ 0.2% + FeSO4 @ 0.2% recorded significantly higher B:C Ratio followed by nano scale Magnesium Oxide @ 100 ppm and combined application of nano sacle Zinc Oxide @ 200 ppm + Magnesium Oxide @ 100 ppm + Iron Oxide @ 200 ppm compared to control water spray. The present study revealed that, micronutrient foliar spray applications viz., combined application of nano scale Zinc Oxide @ 200 ppm + Magnesium Oxide @ 100 ppm + Iron Oxide @ 200 ppm, combined application of bulk ZnSO4 @ 0.2% + MgSO4 @ 0.2% + FeSO4 @ 0.2% and nano scale Magnesium Oxide @ 100 ppm were found superior in terms of YMV tolerance, morpho-physiological efficiency, nutrient content, biochemical, yield and yield components. Other treatments viz., nano scale Zinc Oxide @ 200 ppm, nano scale Iron Oxide @ 200 ppm and bulk FeSO4 @ 0.2% showed moderate performance. Hence, combined application of nano scale Zinc Oxide @ 200 ppm + Magnesium Oxide @ 100 ppm + Iron Oxide @ 200 ppm, followed by bulk ZnSO4 @ 0.2% + MgSO4 @ 0.2% + FeSO4 @ 0.2% were promising. Among the individual nutrient sprays, bulk MgSO4 @ 0.2% and nano scale Magnesium Oxide @ 100 ppm showed to play disease tolerance and minimized the incidence of YMV in blackgram.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810101659
dc.keywordsCHARACTERIZATION, BLACKGRAM, Vigna mungo (L.) Hepper, GENOTYPES, TOLERANCE, YELLOW MOSAIC VIRUS, YMV, NUTRITIONALen_US
dc.language.isoen_USen_US
dc.pages352en_US
dc.publisherAcharya N.G. Ranga Agricultural Universityen_US
dc.research.problemCHARACTERIZATION OF BLACKGRAM (Vigna mungo (L.) Hepper) GENOTYPES FOR TOLERANCE TO YELLOW MOSAIC VIRUS (YMV) AND NUTRITIONAL INTERVENTIONS TO ENHANCE TOLERANCEen_US
dc.subCrop Physiologyen_US
dc.subjectnullen_US
dc.themeCHARACTERIZATION OF BLACKGRAM (Vigna mungo (L.) Hepper) GENOTYPES FOR TOLERANCE TO YELLOW MOSAIC VIRUS (YMV) AND NUTRITIONAL INTERVENTIONS TO ENHANCE TOLERANCEen_US
dc.these.typePh.Den_US
dc.titleCHARACTERIZATION OF BLACKGRAM (Vigna mungo (L.) Hepper) GENOTYPES FOR TOLERANCE TO YELLOW MOSAIC VIRUS (YMV) AND NUTRITIONAL INTERVENTIONS TO ENHANCE TOLERANCEen_US
dc.typeThesisen_US
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