Resumen de Density and size of stomata in the leaves of different hybrids (“Vitis sp.”) and "Vitis vinifera" varieties

Susana Boso Alonso, Pilar Gago Montaña, Virginia Alonso-Villaverde Iglesias, José Luis Santiago Blanco, María Carmen Martínez Rodríguez

• The present work compares the density and size of the stomata of different Vitis vinifera L varieties and other non-vinifera members of Vitis, including a direct producer hybrid. A number of studies have highlighted differences in the density of stomata between Vitis species, but few have examined differences between varieties of V. vinifera. The density and size of the stomata in the lower epidermis of leaves belonging to 12 grapevine varieties, a direct producer hybrid (DPH) involving a V. vinifera and a non-vinifera parent, and the non-vinifera rootstocks SO4 and 110-Ritcher, were therefore examined. Transparent nail polish peel prints of the area between the main and right lateral veins were produced for 10 leaves per variety. These prints were then examined under a light microscope and the number of stomata in a unit area of 0.196 mm2 counted. Image analysis software was then used to measure the length and width of all those counted. Rootstock SO4, Chasselas Dorée, Albariño and Cabernet Sauvignon had the highest stomatal densities (all >34 stomata per unit area), while Castañal, Torrontés and Caiño Blanco and Jacquez (the DPH), had the smallest (all <26.50 stomata per unit area). Treixadura and Caiño Blanco had significantly longer and wider stomata than all the other varieties examined; the DPH Jacquez had among the shortest and narrowest. No relationship was seen, however, between mean varietal leaf size and the stomatal density or stomatal size; nor was any seen between the variables examined and the condition of belonging to V. vinifera or not.