GENETIC ANALYSES OF RESISTANCE TO LATE LEAF SPOT AND RUST VIS-A-VIS PRODUCTIVITY IN GROUNDNUT (Arachis hypogaea L.)
| dc.contributor.advisor | Gowda, M V C | |
| dc.contributor.author | Motagi, B N | |
| dc.date.accessioned | 2019-09-06T03:52:18Z | |
| dc.date.available | 2019-09-06T03:52:18Z | |
| dc.date.issued | 2001 | |
| dc.description.abstract | "Evaluation of 100-groundnut germplasm revealed inter-specific derivatives and mutants as the most potential source of resistance to late leaf spot (LLS) and rust. Components of resistance were more reliable than field disease scores in assessing resistance in germplasm. Though resistance was strongly associated with late maturity, mutants and second cycle interspecific derivatives combined resistance and early maturity. Resistant mutants isolated from VL 1 were grouped in to three distinct clusters. Late leaf spot resistant mutants were susceptible to rust and had more branches; higher seed mass and pod yield and reduced leaf size. An opposite trend was evident with rust resistant mutants indicating their pleiotrophic nature. Evaluation of 10 selected genotypes revealed significant variation for yield loss. Besides resistance parameters, physiological attributes viz., growth rates and partitioning contributed to reduction in yield loss. Late sowing was ideal for disease screening. An inter-specific derivative (D 39d) and a mutant (28-2) combined resistance with high yield and early maturity and they were superior to cultivated varieties. D 39d was also superior in oil quality. Physiological analyses of 3deld loss variation indicated predominant role for sink than source in determining the yield potential of genotypes. Significant interaction between LLS and rust revealed a need for evaluation of genetic material both under natural, where they occur together, as well as individual disease conditions. Two sets of duplicate-complementary recessive genes independently determined resistance to LLS and rust in inter-specific derivatives and mutants. A combination of isozyme (Glutamate Oxaloacetate Transaminase) and protein (seed and hjrpocotyl) profiles could be used uniquely to fingerprint selected genotypes. Polymorphism for peroxidase in resistant and susceptible variants indicated its potential for marker-assisted selection. Peroxidase activity also revealed inducible and constitutive nature of LLS resistance in mutants and inter-specific derivatives, respectively." | en_US |
| dc.identifier.citation | No. of references 273 | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810126630 | |
| dc.keywords | GENETIC ANALYSES OF RESISTANCE TO LATE LEAF SPOT AND RUST VIS-A-VIS PRODUCTIVITY IN GROUNDNUT (Arachis hypogaea L.) | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 262p | en_US |
| dc.publisher | University of Agricultural Science, Dharwad | en_US |
| dc.research.problem | GENETIC ANALYSES OF RESISTANCE TO LATE LEAF SPOT AND RUST VIS-A-VIS PRODUCTIVITY IN GROUNDNUT (Arachis hypogaea L.) | en_US |
| dc.sub | Genetics and Plant Breeding | en_US |
| dc.subject | null | en_US |
| dc.theme | GENETIC ANALYSES OF RESISTANCE TO LATE LEAF SPOT AND RUST VIS-A-VIS PRODUCTIVITY IN GROUNDNUT (Arachis hypogaea L.) | en_US |
| dc.these.type | Ph.D | en_US |
| dc.title | GENETIC ANALYSES OF RESISTANCE TO LATE LEAF SPOT AND RUST VIS-A-VIS PRODUCTIVITY IN GROUNDNUT (Arachis hypogaea L.) | en_US |
| dc.type | Thesis | en_US |