Comparison of the Effect of Trellised and Non-Trellised Training Systems on Morphophysiological and Biochemical Indices Related to Cold Tolerance in Two Grapevine Cultivars

The present study was conducted with the aim of comparing the effect of trellised and non-trellised training systems on winter cold tolerance of two cultivars of Bidaneh Sefid and Bidaneh Ghermez factorially based on a randomized complete block design. During cold acclimation stage, the lowest content of leaf nutrients and the highest rate of leaf fall, leaf periderm formation and bud lignin belonged to Bidaneh Ghermez cultivar under trellised system. Moreover, the highest winter cold tolerance estimated by ion leakage and oxidative browning, total phenol, proline and soluble carbohydrates in both January and March were related to the Bidaneh Ghermez cultivar under the trellised system. Howevere, the lowest winter cold tolerance, total phenol, proline and soluble carbohydrates was related to Bidaneh Sefid cultivar under the non-trellised system. Forthermore, the highest bud water content, starch, hydrogen peroxide and malondialdehyde in both stages of January and March were related to Bidaneh Sefid cultivar under the non-trellised system. In both stages of sampling, the contents of abscisic acid, sucrose, glucose, fructose and raffinose in the bud of both cultivars were higher with the trellised system than with the non-trellised training system. The results of this research can be used to encourage vine growers to change the method of growing grapes from traditional to trellised system.