GENETIC DIVERSITY ANALYSIS FOR DROUGHT RESISTANCE AND WATER USE EFFICIENCY TRAITS IN GROUNDNUT (Arachis hypogaea L.)

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dc.contributor.advisorVASANTHI, R. P.
dc.contributor.authorSARITHA, KOVVURI
dc.date.accessioned2019-05-07T04:58:31Z
dc.date.available2019-05-07T04:58:31Z
dc.date.issued2018
dc.descriptionD5618en_US
dc.description.abstractThe present investigation was carried out during Kharif, 2017 and rabi, 2017-18 to study the genetic divergence, variability, character association and path co-efficients in 32 genotypes of groundnut. The experiment was laid out at Regional Agricultural Research Station, Tirupati in a randomized block design with four replications in kharif and two replications in rabi. Data were recorded on 19 characters in kharif and six characters in rabi. Analysis of variance indicated existence of significant genotypic differences for all the characters. In kharif, the genotypes viz., SG 99, TCGS-1694, R-2001-3-1, ALG-06-320 and TCGS-1653 while in rabi, the genotypes viz., TCGS-1694, ALG-06-320, TCGS-1622, SG 99 and TCGS-1157 showed high mean performance for pod yield as well as for most of yield components with desirable attributes that contribute for WUE and drought resistance. Analysis of genetic parameters revealed that GCV, PCV, heritability (broad sense) and genetic advance as per cent of mean were high for all the traits except shelling percentage in kharif indicating that these traits are amenable for phenotypic selection while in rabi pod yield per plant, SLA at 60 DAS and 100-seed weight recorded high to moderate GCV, PCV, heritability(broad sense) and genetic advance as per cent of mean indicating simple phenotypic selection could be followed for their improvement. Low GCV, PCV, high to moderate heritability and low GAM were observed for SCMR at 60 DAS, RWC and shelling percentage indicating that phenotypic selection would not be that effective to improve these characters. xvii Genetic divergence studies by Mahalanobis’s D2 analysis revealed considerable diversity among 32 genotypes of groundnut and were grouped into seven and eight clusters based on physiological, yield and yield attributes in kharif and rabi respectively. The characters, angle between main axis and primary branches at 60 DAS (72.58%) in kharif and SLA at 60 DAS(33.67%) in rabi contributed maximum to the diversity. This was confirmed by canonical analysis. Based on these studies, cross combinations between genotypes in cluster VII and cluster III in kharif and cluster VIII and cluster II, cluster VIII and cluster V in rabi are proposed to get transgressive segregants for physiological, yield and yield parameters. SSR marker studies detected a high level of genetic variation among the ten groundnut genotypes selected. A high degree of polymorphism was obtained with the primers, PM 45 (0.95) and SEQ5D05 (0.75). The similarity index values ranged from 0.34 to 0.703 indicating a wide range of genetic diversity. Character association studies revealed significant positive correlation of number of primary branches per plant, number of secondary branches per plant, number of pegs per plant, mature pods per plant, immature pods per plant and harvest index with pod yield per plant. Path co-efficient analysis also indicated that these characters were important attributes directly influencing the pod yield in groundnut. Hence, these characters should be considered in formulating selection criteria in breeding programme aimed at improvement of yield in groundnut.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810102168
dc.keywordsDROUGHT RESISTANCE, WATER, GROUNDNUT, Arachis hypogaea L.en_US
dc.language.isoen_USen_US
dc.pages253en_US
dc.publisherAcharya N.G. Ranga Agricultural Universityen_US
dc.research.problemGENETIC DIVERSITY ANALYSIS FOR DROUGHT RESISTANCE AND WATER USE EFFICIENCY TRAITS IN GROUNDNUT (Arachis hypogaea L.)en_US
dc.subGenetics and Plant Breedingen_US
dc.subjectnullen_US
dc.themeGENETIC DIVERSITY ANALYSIS FOR DROUGHT RESISTANCE AND WATER USE EFFICIENCY TRAITS IN GROUNDNUT (Arachis hypogaea L.)en_US
dc.these.typeM.Scen_US
dc.titleGENETIC DIVERSITY ANALYSIS FOR DROUGHT RESISTANCE AND WATER USE EFFICIENCY TRAITS IN GROUNDNUT (Arachis hypogaea L.)en_US
dc.typeThesisen_US
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