EVALUATION OF NEW BREAD WHEAT GENOTYPES UNDER DIFFERENT DROUGHT STRESS CONDITIONS FOR GRAIN YIELD AND SOME IMPORTANT AGRONOMIC AND PHYSIOLOGIC CHARACTERS

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SANJARI A.; VALIZADEH M.; MAJIDI I.; SHIRI M.

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Journal: JOURNAL OF AGRICULTURAL KNOWLEDGE Year:2006 | Volume:16 | Issue:3 Page(s): 97-112

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Information Journal Paper

Title

EVALUATION OF NEW BREAD WHEAT GENOTYPES UNDER DIFFERENT DROUGHT STRESS CONDITIONS FOR GRAIN YIELD AND SOME IMPORTANT AGRONOMIC AND PHYSIOLOGIC CHARACTERS

Author(s)

SANJARI A. | VALIZADEH M. | MAJIDI I. | SHIRI M. | Issue Writer Certificate

Keywords

CYTOPLASMIC MEMBRANEQ2

DROUGHT TOLERANCE INDICESQ2

GENOTYPESQ2

GRAIN YIELDQ3

HERITABILITIESQ3

WHEATQ2

Abstract

For identifying GENOTYPES with high drought stress tolerance and high yield potential, 24 advanced new bread WHEAT GENOTYPES were evalueted in a randomized complete block design with three replications under three irrigation regims, such as non-stress (Yp), pre-anthesis drought stress (Ys2) and post-anthesis drought stress (Ys1) in Ardabil Agricultural Research Station during three years 1997-98, 1998-99 and 1999-2000. Results showed that drought stress intesity (SI) under parenthesis stress (SI=0.33) was higher than post-anthesis stress (SI=0.26). The GRAIN YIELD of GENOTYPES under pre-anthesis drought stress was significantly less than the yield under non-stress and post-anthesis drought stress conditions. GRAIN YIELD under pre-anthesis drought stress was significantly and positively correlated with grain weight/plant (r =0.58**).Grain yield of GENOTYPES on the basis of mean productivity (MP), geometric mean productivity (GMP), drought tolerance (TOL), stress susceptibility (SSI) and stress tolerance (STI) indices were evaluated. Selection based on TOL and SSI identified the tolerant GENOTYPES having low yield potential while selection based on MP, GMP and STI identified GENOTYPES with high yield and high drought stress tolerance. MP, GMP and STI indices were highly and positively correlated with Yp, YS1 and YS2, but TOL and SSI indices were significantly and non-significantly correlated with Yp, respectively. However they were correlated negatively with YS1 and YS2 On the basis of three-dimensional plot, GENOTYPES were classified into four groups (A, B, C and D) and consequently GENOTYPES 4, 13, 14, 15 and 21 were identified as tolerant GENOTYPES with high yield. HERITABILITIES of studied characters such as peduncle length, sterile spikelets /spike, plant height and 1000 grain weight were high. Measuring CYTOPLASMIC MEMBRANE damage and membrane stability at booting and heading stages under preanthesis drought stress showed GENOTYPES no 1, 13 and 21 had more stable membrane and less CYTOPLASMIC MEMBRANE damage and were identified as desirable GENOTYPES. The stability of membrane and membrane damage were heritable in heading stage but not in booting stage.

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