ISHS Acta Horticulturae 754: International Workshop on Advances in Grapevine and Wine Research
THE EFFECT OF WATER STRESS ON SOME PHYSIOLOGICAL CHARACTERISTICS IN 'RASHE' AND 'KHOSHNAVE' GRAPE CULTIVARS |
| Authors: | N. Ghaderi, A. Siosemardeh, S. Shahoei |
| Keywords: | Vitis vinifera, water stress, photosynthesis, transpiration, stomatal conductance, chlorophyll |
| Abstract:
Investigation on the role of water stress conditions on physiological characteristics of plant may provide means to understand bases of drought resistance. In one experiment the rate of photosynthesis (Pn), transpiration (Tr), leaf stomatal conductance (gs), internal CO2 concentration(Ci), and chlorophyll content of two grape cultivars (Vitis vinifera L. ‘Rashe’ and ‘Khoshnav’) under water stress conditions were studied. Water stress performed from the 30th of june till the 5th of july 2003. The results had showed temporary reduction in Pn, Tr and gs, under water stress conditions. While the amount of Ci was decreased during the first few days and then increased. Reduction of soil water content caused reduction in leaf relative water content (RWC). In this experiment during the water stress period, Pn was reduced from 7.32 and 7.21 (µmol m-2 s-1) to 0 in ‘Rashe’ and ‘Khoshnav’ grape cultivars, respectively. Also transpiration was reduced from 6.58 to 0.45 and 6.95 to 0.38 (mmol m-2 s-1) in ‘Rashe’ and ‘Khoshnav’ grape, respectively. The concentration of chlorophyll in both cultivars was reduced. But such a reduction was higher in ‘Khoshnav’ cultivar. The amount of gas exchange and chlorophyll indicated that ‘Rashe’ has higher resistance to water stress than ‘Khoshnav’ cultivar. | |
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