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

Screening cotton varieties (Gossypium hirsutum L.) for heat tolerance under field conditions

  Emine KARADEMIR1*, Cetin KARADEMIR1, Remzi EKINCI1, Sema BASBAG2 and Hüseyin BASAL3
  1Republic of Food, Agricultural and Livestock Ministry, General Directorate of Agricultural Research and Policy, GAP,  International Agricultural Research and Training Center P. O. Box: 72, 21110, Diyarbakir, Turkey. 2Department of Field Crops, Faculty of Agriculture, University of Dicle, Diyarbakır, Turkey. 3Department of Field Crops, Faculty of Agriculture, University of Adnan Menderes, Aydın, Turkey.
Email: [email protected]

  •  Accepted: 06 September 2012
  •  Published: 31 December 2012

Abstract

 

Fifteen upland cotton Gossypium hirsutum L., were evaluated for heat tolerance based on agronomical and physiological characteristics under field conditions where temperature exceeded 40°C in July and August. Genotypes showed statistically significant differences for stomatal conductance, photosynthetic yield, fluorescence, photosynthetically active radiation (PAR), seed cotton yield, plant height, boll weight, seed cotton weight, number of seeds per boll and 100 seed weight. In the study, relative cell injury level (RCIL), ranged from 54.56 to 79.44% and stomatal conductance ranged from 264.86 to 570.50 mol m-2s-1. Associations between investigated traits indicated that there were some positive correlations. These data indicated that photosynthetic yield, fluorescence, chlorophyll content (SPAD value), cell membrane thermostability (CMT), plant height and number of bolls per plant can be used for improving seed cotton yield. However, among these measurements CMT, SPAD value and fluorescence were more practical in large breeding trials. The results showed that AGC 375 and AGC 208 cotton varieties had lower relative cell injury level (higher cell membrane thermostability) and higher seed cotton yield and photosynthetic yield than other investigated varieties.

 

Key words: Cotton, heat tolerance, physiological traits, cell membrane thermostability (CMT).

Abbreviation

PAR, Photosynthetically active radiation; CMT, cell membrane thermostability; LEL, leaf electrolyte leakage; CTD, canopy temperature depression, VPD, leaf air vapor pressure deficitRCIL, relative cell injury level; QTLs, quantitative trait loci.