Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810057054
Authors: USHARANI C. V.
Advisor: Dr. MANJULA S. MARALAPPANAVAR
Title: CHARACTERIZATION AND COMBINING ABILITY STUDIES ON TRAITS INFLUENCING PRODUCTIVITY AND SUCKING PEST TOLERANCE IN COTTON (Gossypium hirsutum L.)
Publisher: University of Agricultural Sciences Dharwad
Language: en
Type: Thesis
Pages: 226
Agrotags: null
Keywords: CHARACTERIZATION AND COMBINING ABILITY STUDIES ON TRAITS INFLUENCING PRODUCTIVITY AND SUCKING PEST TOLERANCE IN COTTON (Gossypium hirsutum L.)
Abstract: Cotton has been principal commercial crop of India since time immemorial. Exploitation of heterosis has played a major role in crop improvement for increasing the productivity per unit area. The insect pests viz., Bollworms and sucking pests are the major yield limiting factors in cotton. Bt toxin expressed by Bt-cotton is toxic against bollworms but not against sucking pests especially jassids and mirid bugs which have become major pests in Bt- cotton in India. Plant morphological traits like pubescence and bract type are important and easily recognized to reduce this damage. The main objective of the present study was to improve yield by combining ability study, characterization of morphological traits for sucking pest resistance and association studies in intra hirsutum crosses. Significant variability was observed for all the 11 traits studied among 27 parental lines. High heritability (>60%) was observed for most of the traits. A total of 110 hybrids were evaluated for combining ability and heterosis using L x T design. Six lines and two testers revealed significant positive GCA for SCY and were found to be good combiners. Among crosses highest yield was recorded by DHS 10-4 x DHS T1 (32.24q ha-1) with fiber strength of 21.88gtex-1 with significant SCA. High variation and genetic advance was observed for the traits like pubescence scoring, jassid and mirid bug count. Significant correlation among all pubescence related traits was observed. A strong negative association was observed between pubescence count with jassid nymphal count and jassid injury grade and strong positive association was observed between bract marginal pubescence with mirid bug count. Detailed analysis resulted in identification of superior genotypes viz.,TCH 16781, DHS 10-18 and DHS T2 having higher pubescence on leaf with reduced pubescence on bract suitable for breeding programme for development of both jassid and mirid bug resisitant genotype.
Subject: Genetics and Plant Breeding
Theme: CHARACTERIZATION AND COMBINING ABILITY STUDIES ON TRAITS INFLUENCING PRODUCTIVITY AND SUCKING PEST TOLERANCE IN COTTON (Gossypium hirsutum L.)
These Type: M.Sc
Issue Date: 2015-06
Appears in Collections:Thesis

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