Evaluation of Morphophysiological Traits of Cotton Cultivars (Gossypium hirsutum) under Water Deficiency Stress at Seedling Stage

پژوهشهای زراعی ایران

Article 1, Volume 14, Issue 3 - Serial Number 43, October 2016, Pages 403-414   

Document Type: Research Article

DOI: 10.22067/gsc.v14i3.35268

Authors

H. R Mehrabadi^{* 1}; A Nezami²; M Kafi²; M. R Ramezani Moghaddam¹

¹Khorasan Razavi Agricultural and Natural Resources Research Center

²Ferdowsi University of Mashhad

Abstract

Introduction
Major cultivated cotton regions of Iran are located in dry and semiarid climates, therefore water deficiency or drought stress is inseparable part of cotton production systems in these regions. So identification and introduction of drought tolerant cotton genotypes is crucial. showed that water stress decreased plant growth rate, leaf area and finally photosynthesis in cotton. In addition plant height reduction is a primary effect of water stress. According to results, net photosynthesis, stomatal conductance and transpiration decreased simultaneously with an increase in drought stress intensity.
Physiologic traits monitoring were notified as a proper gadget for selection and improvement of germplasm. Whereas investigation of many genotypes in field conditions under drought stress is difficult and it is not accurate enough, also good correlation has observed between the results of drought tolerance at seedling stage and field experiments, therefore this research has tried to evaluate some of the morphologic traits in cotton genotypes at seedling stage under drought stress and none stress conditions.
Materials and Methods
22 cotton cultivars were grown under none water stress (field capacity) and drought stress conditions
(-1MPa) using a factorial arrangement of treatments based on randomized completely design with three replications at College of Agriculture, Ferdowsi University of Mashhad in 2011. Then each genotype (10 seed) was sown at a pot (1.5 l-1). At two true leaf stages, pots were tinned to one seedling. Soil moisture content was kept up to two true leaf stages at field capacity and at the end of experiment, it was conserved about -1MPa using weight method.
The measured parameters were:
Plant height, leaf area, dry weight of leaf, stem, root and whole plant and also decreasing percent of each parameter under stress in comparison with control in any genotype was determined at the end of experiment. Stomatal resistance and leaf temperature were measured with leaf porometer set (model Decagon Devices, Inc) on three leaf stage of cotton seedling. Relative water content (RWC) of leaf was also measured. Variance analysis, Comparison of trait means and correlation between traits were carried out using SAS and Excel and least significant difference (LSD).
Results and Discussion
Interaction between water deficiency stress and cotton cultivars were significant (P

Keywords

Correlation; Drought tolerance; Dry weight; Leaf temperature; Stomatal resistance

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