STUDIES ON THE ROLE OF STRUCTURAL AND BIOCHEMICAL DEFENSE COMPONENTS AGAINST BLACKGRAM POWDERY MILDEW (Erysiphe polygoni D. C.)
| dc.contributor.advisor | MANOJ KUMAR, V | |
| dc.contributor.author | RAGA SRAVANTHI, B | |
| dc.date.accessioned | 2019-04-30T06:21:49Z | |
| dc.date.available | 2019-04-30T06:21:49Z | |
| dc.date.issued | 2018 | |
| dc.description | D5658 | en_US |
| dc.description.abstract | Blackgram or urdbean [Vigna mungo (L.) Hepper] is one of the important pulse crops which is grown as a source of income and nutrition to billions of people in south east asia. The crop is affected by fungi, bacteria, viruses, nematodes and also abiotic stresses. Among the fungal diseases, powdery mildew is one of the serious constraint that causes potential yield loss in India. Powdery mildew symptoms develop as small, white specks on the upper surface of the leaves which later coalesced forming bigger patches. Initial mycelial growth was sparse, and later the mycelium matured and produced conidiophores and conidia which appeared as a thick powdery mass on both the surfaces. Complete coating of white powdery fungal mass on leaves, stems, pods. Leaves turn to chlorotic and leading to defoliation. The pathogen was observed to produce dirty white hyaline mycelium and barrel shaped conidia measuring 30 x 16 μm at 400X magnification A total of fifty three blackgram genotypes were screened against powdery mildew. During kharif 2017-18, none of the genotypes was found resistant. Eleven genotypes viz., LBG 787, LBG 645, RBU 12-02, TPU 4, TU 94-2, VBG 12-034, VBG 13-003, VBG 12-111, NDUK 15-222, PU-1518 and PU-6 were moderately susceptible, twenty six genotypes were susceptible and sixteen genotypes were highly susceptible. Eight blackgram genotypes were selected and categorized as moderately resistant (LBG-752, PU-31), moderately susceptible (RBU 12-02, TU 94-2), susceptible (PU-1540, PU-1503) and highly susceptible (KPU 12-1730, PU-1520). Significant negative correlation occurred between powdery mildew severity and morphological characters of different genotypes, leaf area of middle leaves (‘r’= -0.766), leaf thickness of upper (‘r’= -0.879), middle (‘r’= -0.907) lower leaves (‘r’= -0.881), trichome density on adaxial surface of upper (‘r’= -0.889), middle (‘r’= - 0.968), lower (‘r’= -0.906) and on abaxial surface of upper (‘r’= - 0.952), middle (‘r’= - 0.899), and epicuticular wax of upper (‘r’= -0.943), middle (‘r’= - 0.951) and lower (‘r’= - 0.976) showed significantly negative correlation with powdery mildew severity, where as stomatal frequency on adaxial surface of upper (‘r’= 0.905), middle (‘r’= 0.843), lower (‘r’= 0.935) and on abaxial surface of upper (‘r’= 0.942), middle (‘r’= 0.929), lower (‘r’= 0.916) leaves were positive correlation with disease severity. Biochemical compounds such as phenols, peroxidase and phenylalanine ammonia lyase were higher in moderately resistant genotype PU-31. Phenol content in inoculated plants was negatively correlated with disease severity at all intervals 5 DAI (‘r’= - 0.915), 10 DAI (‘r’= - 0.925), 15 DAI (‘r’= - 0.943), 20 DAI (‘r’= - 0.814). Peroxidase activity and phenylalanine ammonia-lyase activity in inoculated plants was negatively correlated with disease severity at all intervals i.e., at 4 DAI (‘r’= - 0.978; ‘r’ = - 0.931), 8 DAI (‘r’= - 0.988; ‘r’= - 0.910), 12 DAI (‘r’= - 0.990; ‘r’= - 0.963), 16 DAI (‘r’= - 0.914; ‘r’= - 0.965 respectively). | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810101341 | |
| dc.keywords | STRUCTURAL, BIOCHEMICAL, BLACKGRAM, MILDEW, Erysiphe polygoni D. C. | en_US |
| dc.language.iso | en_US | en_US |
| dc.pages | 131 | en_US |
| dc.publisher | Acharya N.G. Ranga Agricultural University | en_US |
| dc.research.problem | STUDIES ON THE ROLE OF STRUCTURAL AND BIOCHEMICAL DEFENSE COMPONENTS AGAINST BLACKGRAM POWDERY MILDEW (Erysiphe polygoni D. C.) | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | STUDIES ON THE ROLE OF STRUCTURAL AND BIOCHEMICAL DEFENSE COMPONENTS AGAINST BLACKGRAM POWDERY MILDEW (Erysiphe polygoni D. C.) | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | STUDIES ON THE ROLE OF STRUCTURAL AND BIOCHEMICAL DEFENSE COMPONENTS AGAINST BLACKGRAM POWDERY MILDEW (Erysiphe polygoni D. C.) | en_US |
| dc.type | Thesis | en_US |