Diallel analysis on variation of Verticillium wilt tolerance in upland cotton grown in Zimbabwe

Chapepa, Blesssing and Manjeru, Pepukai and Ncube, Bheki and Mubvekeri, Washington (2015) Diallel analysis on variation of Verticillium wilt tolerance in upland cotton grown in Zimbabwe. pp. 39-48. ISSN 1991-637X

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Abstract

Verticillium wilt disease causes significant losses to cotton yield and varietal development for resistance is critical in combating this threat. A study was carried out to determine the underlying genetic pattern controlling disease tolerance and identify suitable parental lines to use in varietal tolerance development. Five cotton varieties were crossed in a half diallel mating system to produce ten crosses and five selfed parental lines which were screened against Verticillium wilt by artificial inoculation. There were significant variations on the severity scores, vascular brown index scores, morphological and agronomical traits under Verticillium wilt pressure. The Verticillium wilt severity scores ranged from 1.22 to 3.07 and VBI scores from 0.78 to 2.77. The mean squares of general combining ability (GCA) for the various characteristics of the parents were significant and specific combining ability (SCA) of vascular brown index score. Three parental lines were identified as breeding material with good GCA, morphological and agronomical performance which were CRI-MS-1, SZ9314 and BC853. This study imply that varietal tolerance can be developed by incorporating genotypes with resistance genes in breeding programmes. Future work should focus on developing resistant varieties suitable for production in Verticillium wilt prone areas.

Item Type: Article
Uncontrolled Keywords: General combining ability, specific combing ability, cotton, Verticillium wilt
Subjects: S Agriculture > S Agriculture (General)
S Agriculture > SB Plant culture
Divisions: Universities > Private Universities > Solusi University
Depositing User: Mr Blessing Chapepa
Date Deposited: 26 Jun 2015 11:17
Last Modified: 26 Jun 2015 11:17
URI: http://researchdatabase.ac.zw/id/eprint/564

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