Browsing by Author "RAMESH, S"
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ThesisItem Open Access "ASSESSMENT OF LINEAR AND NON-LINEAR COMPONENTS OF GENOTYPIC VARIANCE FOR YIELD AND ITS COMPONENTS IN SESAME (Sesamum indicum L.)"(University of Agricultural Science, BANGALORE, 1996) RAMESH, S; SHERIFF, R AAbstract not availableThesisItem Open Access DEVELOPMENT AND VALIDATION OF CORE COLLECTIONS OF DOLICHOS BEAN (Lablab purpureus L. Sweet) GERMPLASM(University of Agricultural Sciences GKVK, Bangalore, 2013-07-23) VAIJAYANTHI, P V; RAMESH, SDevelopment of a reduced representative set of a large base collection enable its enhanced use in crop improvement. Considering the size of current Dolichos bean germplasm (648 accessions) being maintained at AICRP on pigeonpea, ZARS, UAS, GKVK, Bangalore is unwieldy for management, characterization and evaluation and hence increased use in breeding Dolichos bean, an attempt was made to develop a core set from Dolichos bean germplasm. 644 germplasm accessions along with four check varieties were characterized for 21 qualitative traits and evaluated for 20 quantitative traits following Augmented design during Kharif 2012 at ZARS, UAS, GKVK, Bangalore. Substantial polymorphism for qualitative traits and genetic variability for quantitative traits in the germplasm were evident. A total of 10 core sets were developed using 20 quantitative traits data following standard stratified sampling and heuristic strategiesbased approaches. Qualitative traits-based statistics such as chi-square test and ‘class coverage’, and ‘Shannon-Weaver diversity index’ were used as validation criteria to examine homogeneity and retention of qualitative traits-based classes, and polymorphism diversity, respectively in the core sets to assess their representativeness. Quantitative traitsbased univariate statistics -mean and variance and standardized multivariate statistics such as SMD%, CR%, VD% and VR% were used to assess the representativeness of core sets. Different core sets were representative of the base collection based on different validation criteria. Heuristic approach-based core set of 10 per cent size was identified as the best representative of the base collection. This core set is suggested as a priority resource for use in breeding Dolichos bean.Technical ReportItem Open Access DYNAMICS OF QUANTITATIVE TRAITS IN F2 DERIVED FULL-SIB AND INBRED PROGENIES OF DOLICHOS BEAN [Lablab purpureus (L.) Sweet](2014-07-05) CHANDRAKANT; RAMESH, STaking the cues from beneficial effects of F2 bi-parental (BIP) mating in several self-pollinated crops, an investigation was carried out to assess the impact of inter se mating in F2 population derived from HA 4 (a high yielding photoperiod in-sensitive released variety) × GL 37 (a photoperiod sensitive germplasm accession) on quantitative traits mean, range, variance, additive genetic variance (σ2A), narrow-sense heritability (NS-h2) inter-relationships and frequency of transgressive segregants in Dolichos bean. F2 BIP mating derived (BIP F3) progenies and selfed (F3) progenies of parents of BIP mating were evaluated for 10 quantitative traits (QTs) at the experimental plots of Department of Genetics and Plant Breeding, UAS, GKVK, Bangalore following Augmented design during 2013 kharif season. Random mating in F2 population in Dolichos bean was effective in increasing the means, variances, σ2A and NS-h2 of traits such as racemes plant-1, fresh pods node-1, fresh pods plant-1 and fresh pod yield plant-1. BIP mating also resulted higher frequency of individuals that surpassed higher scoring parent for racemes plant-1, fresh pods node-1, fresh pod yield plant-1 and 100-fresh seed weight. The results suggested rapid genetic gain per selection cycle for longer-term and better prospects of deriving superior pure-lines with desired traits/combination of traits from inter-mated population. Further, significant shift in correlation coefficient of fresh pod yield plant-1 with racemes plant-1 from -0.33* (in F3 progenies) to 0.19 (in BIP F3 progenies) suggested the possibility of increasing the number of racemes plant-1 without penalty in fresh pod yield plant-1 through selection.ThesisItem Embargo EFFECT OF LWD RESISTANCE IN THE SEED PARENT ON GRAIN YIELD AND LWD RESPONSE OF MAIZE (Zea mays L.) HYBRID NAH-1137 (HEMA)(University of Agricultural Sciences, Bangalore, 2022-12-22) ANIKET, SURYAVANSHI; RAMESH, SThe low productivity of maize in Karnataka is attributed to various biotic and abiotic constraints. The biotic constraints, of which, Late Wilt Disease (LWD) caused by, Harpophora maydis is a destructive disease, causing yield losses ranging from 10.18 to 31.08%. Hence, development and deployment of LWD resistant cultivars is regarded as cost-effective and environmentally friendly strategy to reduce losses due to LWD. 11 Marker assisted selection (MAS) derived LWD resistant versions of NAI-137 and NAI- 137, Hybrid combination of these LWD resistant versions of NAI-137 with MAI-105 and ‘Hema’ were evaluated at University of Agricultural Sciences, GKVK, Bangalore to compare grain yield potential of LWD susceptible seed parent of UASB-bred maize hybrid ‘Hema’ with its MAS-derived LWD resistant versions and to identify variants of ‘Hema’ with grain yield at least comparable to ‘Hema’ coupled with higher levels of LWD resistance. In the present study the six seed parents160-2, 66-4, 84-2, 144-4, 88-1 and 146- 1 were found significantly better yielder than NAI-137 and Six hybrids namely, 66-4 × MAI-105, 84-2 × MAI-105, 102-1 × MAI-105, 144-4 × MAI-105, 88-1 × MAI-105 and 145-1 × MAI-105 significantly better yielder than ‘Hema’ hybrid. And five hybrids namely 66-4 × MAI-105, 84-2 × MAI-105, 144-4 × MAI-105, 88-1 × MAI-105 and 145-1 × MAI- 105 were found high yielding coupled with tolerance to LWD. These five hybrids are suggested for large scale evaluation for grain yield and LWD tolerance for confirmation.ThesisItem Open Access Identification of sterility mosaic disease resistant recombinant inbred lines in high yielding background and localizing genomic regions controlling its resistance in pigeonpea [Cajanus cajan (L.) Millsp.](University of Agricultural Sciences GKVK, Bangalore, 30-07-12) NEETHA, JAYARAM; RAMESH, SSterility mosaic disease (SMD) of pigeonpea [Cajanus cajan (L.) Millsp.] caused by pigeonpea sterility mosaic virus (PPSMV) is one of the most important diseases of pigeonpea which can cause yield loss upto 95 percent under favourable conditions. Development and deployment of cultivars resistant to SMD is considered as most economical and eco-friendly option to mitigate the losses due to SMD. Identification of easily assayable, crop-stage non-specific and environment-neutral surrogates such as DNA markers linked to genomic regions controlling SMD is a step towards this. In the present study, 120 RILs derived from SMD susceptible (TTB 7) and resistant parents (ICP 7035), their parents (TTB 7 and ICP 7035) and two checks (BRG 1 and BRG 2) were screened for response to SMD following Leaf Stapling technique for use in locating genomic regions controlling SMD resistance at All India Co-ordinated Research Project (AICRP) on pigeonpea, University of Agricultural Sciences (UAS), Gandhi Krishi Vignana Kendra (GKVK), Bengaluru during 2011. The RILs were phenotyped for economic traits at the experimental plots of the Department of Genetics and Plant Breeding, UAS, GKVK, Bengaluru during 2011. The RILs 14, 92 and 107 were immune to the disease (0.00% SMD incidence) and transgressed their resistant parent, ICP 7035 (06.67% SMD incidence). The RILs 03 (10.00% SMD incidence) and 32 (06.67% SMD incidence) were found resistant to SMD infection with pod and seed yield potential better than the better parent (TTB 7).The RIL No. 51, 12, 40, 04, 28, 59, 03, 62 and 63 transgressed their parents and BRG 1 and BRG 2 for pod yield potential. One (ICPMIE04) of the eleven SSR markers polymorphic to parents of RILs could differentiate SMD resistant and susceptible bulks and their constituent individuals of RILs. However, single marker analysis indicated lack of evidence for its association with genomic regions conferring SMD resistance.ThesisItem Open Access THE STUDIES ON HETEROSIS AND GENETICS OF QUALITATIVE CHARACTERS IN PROSO MILLET (Panicum miliaceum L.)(UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE, 1990) RAMESH, S; SHANKARE GOWDA, B TAbstract not availableThesisItem Open Access A STUDY ON DRIP AND FURROW METHODS OF IRRIGATION IN GREEN CHILLI (Capsicum annuum L.) UNDER DIFFERENT PLANTING PATTERNS AND PLANT DENSITIES(UNIVERSITY OF AGRICULTURAL SCIENCES, BANGALORE, 1986) RAMESH, S; KUMARA SWAMY, A SABSTRACT NOT AVAILABLE