GENETIC DIVERGENCE AND DROUGHT TOLERANCE STUDIES IN SUNFLOWER (Helianthus annuus L.) GENOTYPES

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dc.contributor.advisorKULDEEP SINGH DANGI
dc.contributor.authorSRINIVAS, B
dc.date.accessioned2016-08-27T10:52:41Z
dc.date.available2016-08-27T10:52:41Z
dc.date.issued2004
dc.description.abstractIn the present investigation, 100 sunflower (Helianthus annuus L.) GMU lines were screened for their temperature tolerance by using Temperature Induction Response (TIR) technique in laboratory conditions at DOR, Hyderabad. Forty three genotypes along with two checks, KBSH-1 and Morden were studied for genetic divergence. Out of 43 lines, 11 genotypes were identified as more thermotolerant and studied along with the check variety ‘Morden’ for their moisture stress tolerance at field level. These studies were conducted at College Farm, College of Agriculture, Hyderabad during Summer, 2004. From the experiment on thermotolerance screening eleven lines viz., GMU- 109, GMU-129, GMU-133, GMU-134, GMU-138, GMU-141, GMU-149, GMU- 157, GMU-175, GMU-185 and GMU-196 were identified as most thermotolerant as they exhibited above 80 per cent seeding survival during recovery period following the induction and lethal temperature treatmetns. For genetic divergence studies the analysis of variance revealed significant differences among the genotypes for all the 15 characters studied. Based on Mahalanobis D2 analysis the 45 genotypes were grouped into 9 clusters. The pattern of distribution of genotypes into various clusters revealed that there was no relationship between geographical distribution and genetic diversity. Greater genetic divergence found between cluster I and IX, suggested exploitation of these two clusters by intermating the genotypes in a definite breeding designs to explore the fullest range of heterosis and to realize good recombinant lines. The genotypes GMU-104, 118 and 107 (cluster I), GMU-122 (cluster III), Morden (cluster VI) and GMU-109, 114, 113 and 132 (cluster IX) could be considered for recombination breeding in order to get desirable segregants with higher yield potential. The drought tolerance studies conducted on 12 genotypes for eleven characters revealed that there were no significant differences among the stress treatments for the traits, plant height, total dry matter per plant, 100-seed weight and harvest index, while the characters head diameter, head weight, number of unfilled seeds per head, number of filled seeds per head, seed filling per cent, seed yield per plant and leaf area index differed significantly among the stress treatments. All the characters studied were affected during stress imposed at flowering except for the trait 100-seed weight which was effected more during stress at seed filling. The genotypes GMU-157, GMU-149, GMU-129 and GMU-185 were found to be more tolerant to moisture stress, based on their performance for various characters studied.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/74045
dc.language.isoenen_US
dc.publisherACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABADen_US
dc.relation.ispartofseriesD7258;
dc.subGenetics and Plant Breeding
dc.subjectGENETIC, DIVERGENCE, DROUGHT, TOLERANCE, STUDIES, SUNFLOWER, (Helianthus annuus L.), GENOTYPES,en_US
dc.these.typeM.Sc
dc.titleGENETIC DIVERGENCE AND DROUGHT TOLERANCE STUDIES IN SUNFLOWER (Helianthus annuus L.) GENOTYPESen_US
dc.typeThesisen_US
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