Physiological responses of two grapevine cultivars to combined drought and high temperature stresses in the presence of arbuscular mycorrhiza
Drought stress and high temperature are the most important environmental factors in many parts of the world that pose a threat to the plants' growth and yield production. While the two stresses often occur simultaneously, little information has already been reported about the effects of their interaction on plants and also the role of arbuscular mycorrhiza in these conditions. In this research the effects of Glomus etunicatum on growth and physiological traits were considered in two grapevine cultivars ('Perlette' and 'Yaghouti') under two irrigation levels (water deficit for 9 days and full irrigation regimes) and three temperature levels (25, 40, and 45°C). This experiment was conducted on the basis of randomized complete block design with 4 replications under greenhouse condition. Results indicated that high temperature stress had no effect on photosystem II efficiency, but drought stress decreased photosystem II efficiency. However, photosystem II photochemical efficiency was dramatically decreased under combined application of drought and high temperature stresses. Proline accumulation in plants under drought stress alone and in combination with high temperature was observed. Root colonization in both cultivars increased under drought stress, but under combined drought and high temperature stresses of 45°C reduced. Both 'Perlette' and 'Yaghouti' recovered during 4 days when rewatered. Generally these cultivars tolerated high temperature stress but their growth rate decreased under combined drought and high temperature stresses.
Shahsavandi, F., Eshghi, S. and Gharaghani, A. (2018). Physiological responses of two grapevine cultivars to combined drought and high temperature stresses in the presence of arbuscular mycorrhiza. Acta Hortic. 1190, 45-52
'Yaghouti' cultivar, fresh weight, proline, photosystem II