African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Variability for drought tolerance in cotton (Gossypium Hirsutum L.) for growth and productivity traits using selection index

Abdel Hafiz Adam Dahab1*, Bahaeldeen Babiker Mohamed1, Tayyab Husnain1 and Muhammad Saeed2        
1Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore, Pakistan. 2Department of Botany, Government College University, Faisalabad, Pakistan.
Email: [email protected]

  •  Accepted: 25 July 2012
  •  Published: 11 September 2012

Abstract

The presence of genetically based difference in drought stress tolerance is a key for breeding cultivars with enhanced tolerance to water stress by selection and breeding. In order to achieve such evidence inGossypium hirsutum, 90 genotypes were evaluated for growth and productivity traits in randomized complete block design (RCBD) with three replications. The genotypes were evaluated under well watered (W1) and water stressed conditions (W2). From the variance analysis, significant differences were detected among varieties for seed cotton yield, boll number, boll weight, number nodes and plant height. The data indicates that the numbers of formed bolls in water stressed were less than that in non-stress conditions, and significantly correlated with seed cotton yield. High heritability and high genetic advance was also found for certain traits. Some genotypes were ranked top on the basis of plant height and number of nodes, while others ranked well on the basis of seed cotton yield. Hence, to become clear of this difficulty, selection index was performed by giving an equal weight to all the growth and productivity traits studied. Index ranked all 90 genotypes from top to low and revealed that MNH-6070, MNH-552, SLS-1, MNH-812, MNH-806, MNH-636, FH-113, 4 F, MS-40, CIM-1100, 1021(Kivi), L.S.S, MNH-807, FH-682, 841/52 were the top 15 genotypes more tolerant and stable at drought stress condition.

 

Key words: Cotton, drought, selection index.