RESPONSES OF WHEAT GENOTYPES TO HEAT STRESS AT DIFFERENT DEVELOPMENTAL STAGES

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AALIKHANI M.; MOZAFARI J.; DARVISH F.; ARSHAD Y.

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Journal: Iranian Journal of Crop Sciences Year:2007 | Volume:9 | Issue:1 (33) Page(s): 45-59

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Title

RESPONSES OF WHEAT GENOTYPES TO HEAT STRESS AT DIFFERENT DEVELOPMENTAL STAGES

Author(s)

AALIKHANI M. | MOZAFARI J. | DARVISH F. | ARSHAD Y. | Issue Writer Certificate

Keywords

HEAT STRESSQ2

WHEAT DEVELOPMENTQ3

YIELD COMPONENTSQ2

HEAT TOLERANCEQ2

GENOTYPIC VARIATIONQ2

Abstract

HEAT STRESS during crop developmental stages, particularly in reproductive phase, is considered a major factor reducing wheat yield in tropical and subtropical regions of the world. The effect of heat shock on YIELD COMPONENTS of five selected spring wheat genotypes was studied. The heat shock of 35°C and 40°C were imposed during double ridge, anthesis and grain filling stages under controlled environments (greenhouse and growth chamber). Genotypes responded differently to HEAT STRESS during all three stages. All genotypes except genotype KC-4511 were tolerant to HEAT STRESS of 35°C at double ridge stage of the shoot apex, while all genotypes examined were killed by the heat shock of 40°C at this stage. Heat shock of 40°C at anthesis dramatically reduced the number of grains per spike in genotypes Atrak, KC-4511 and KC-4512, while no kernel was produced in genotypes KC-7168 and KC-7732. Heat shock of 40°C at grain filling stage caused serious loss of grain weight and spike weight; however, it didn't have any significant effect on the number of grains per spike. Grain weight was reduced by 38% in genotype KC-7732 and 61% in genotype KC-7168. Spike weight reduction ranged from 39% in genotype KC-4511 to 64% in genotype KC-7168. According to the results of this research short periods of heat shock which may occur in wheat growing areas of Iran, could substantially reduce the wheat yield. Results reported here implies that in a wheat breeding program for HEAT TOLERANCE, necessary attention should also be paid to GENOTYPIC VARIATION for HEAT TOLERANCE at anthesis stage, in addition to the grain filling stage, because HEAT STRESS, usually, takes place from anthesis stage in Iran.

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APA: Copy

AALIKHANI, M., MOZAFARI, J., DARVISH, F., & ARSHAD, Y.. (2007). RESPONSES OF WHEAT GENOTYPES TO HEAT STRESS AT DIFFERENT DEVELOPMENTAL STAGES. IRANIAN JOURNAL OF CROP SCIENCES, 9(1 (33)), 45-59. SID. https://sid.ir/paper/57420/en

Vancouver: Copy

AALIKHANI M., MOZAFARI J., DARVISH F., ARSHAD Y.. RESPONSES OF WHEAT GENOTYPES TO HEAT STRESS AT DIFFERENT DEVELOPMENTAL STAGES. IRANIAN JOURNAL OF CROP SCIENCES[Internet]. 2007;9(1 (33)):45-59. Available from: https://sid.ir/paper/57420/en

IEEE: Copy

M. AALIKHANI, J. MOZAFARI, F. DARVISH, and Y. ARSHAD, “RESPONSES OF WHEAT GENOTYPES TO HEAT STRESS AT DIFFERENT DEVELOPMENTAL STAGES,” IRANIAN JOURNAL OF CROP SCIENCES, vol. 9, no. 1 (33), pp. 45–59, 2007, [Online]. Available: https://sid.ir/paper/57420/en

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