Evaluation of sorghum genotypes under drought stress conditions using some stress tolerance indices

Seven genotypes of sorghum ( Sorghum bicolour (L.) Moench) were studied in both drought and normal conditions. In each condition, the genotypes were evaluated using a split plot based randomized complete block design with three replications. Drought tolerance indices including stability tolerance index (STI), mean productivity (MP), geometric mean productivity (GMP), stress susceptibility index (SSI), tolerance index (TOL) were calculated for each genotype. The maximum value of STI (0.687), MP (658.95) and GMP (624.94) were recorded for genotype KGS 3. Correlation coefficients revealed that MP index had the highest value in two conditions with grain yield. Thus, tolerance index including MP is suitable for screening of tolerant genotypes in drought stress condition. Cluster analysis by method Ward classified seven genotypes in two groups in drought stress condition. Key words: Sorghum, drought indices, grain yield, cluster analysis.

[1]  M. Akçura,et al.  Evaluation of drought tolerance indices for selection of Turkish oat (Avena sativa L.) landraces under various environmental conditions. , 2011 .

[2]  M. Rad,et al.  Study of limit irrigation on yield of lentil (Lens culinaris) genotypes of national plant gene bank of Iran by drought resistance indices. , 2009 .

[3]  R. Talebi,et al.  Effective selection criteria for assessing drought stress tolerance in durum wheat (Triticum durum Desf.). , 2009 .

[4]  A. Arzani,et al.  Assessment of Drought Tolerance in Segregating Populations in Durum Wheat , 2006 .

[5]  K. Poustini,et al.  Evaluation of drought resistance indices under various environmental conditions , 2006 .

[6]  B. S. Patil,et al.  Drought tolerance in sorghum by pollen selection using osmotic stress , 2003, Euphytica.

[7]  J. Kelly,et al.  Traits related to drought resistance in common bean , 1998, Euphytica.

[8]  J. Stark,et al.  Relative sensitivity of spring wheat grain yield and quality parameters to moisture deficit , 2001 .

[9]  M. I. Cagirgan,et al.  Assessment of Response to Drought Stress of Chickpea(Cicer arietinumL.) Lines Under Rainfed Conditions , 1998 .

[10]  H. Nguyen,et al.  Inheritance of the stay green trait in sorghum , 1994 .

[11]  J. Clarke,et al.  Evaluation of methods for quantification of drought tolerance in wheat , 1992 .

[12]  G. M. Paulsen,et al.  Desiccation Tolerance and Its Relationship to Assimilate Partitioning in Winter Wheat , 1990 .

[13]  A. Rosielle,et al.  Theoretical Aspects of Selection for Yield in Stress and Non-Stress Environment 1 , 1981 .

[14]  R. Fischer,et al.  Drought resistance in spring wheat cultivars, 1. Grain yield responses. , 1978 .