engleski

Response of winter wheat genotypes to water stress in two different growth stages

Drought is one of the most important abiotic stresses in agricultural productions. In areas exposed to drought yield losses of winter wheat could be more than 50%. Wheat plant is not equally sensitive to drought stress at all stages of growth and development. Therefore, the aims of this study were to examine responses of winter wheat genotypes and agronomic traits to drought stress induced in two different growth stages and to determine the relationship of these traits to yield. The field experiment was conducted with six Croatian winter wheat genotypes under three water regimes: control, drought stress applied at tilling stage and grain filling period. Results showed significant difference between genotypes for the most of observed agronomic traits. Drought stress induced in both growth stages resulted with reduction of yield. Decline in yield when drought was induced at tilling stage was caused by reduction of number of spikes per square meter, increased number of sterile spikelets per spike and reduction of grain number per square meter, while decline in yield when drought was induced at grain filling period was result of reduction in grain number per spikelet, grain weight, 1000 grain weight and harvest index.

winter wheat; water stress

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