Determination of Stoma Density and Distribution of Hazelnut (Corylus Avellana L.) Cultivars and Genotypes Grown in Different Ecologies

Abstract

In this study, the numbers and distribution of stomata in the leaves of eleven hazelnut cultivars and types grown in Trabzon and Hizan (Bitlis) district, which are two different ecologies, were examined. Stomata were observed hypostomatically only on the lower leaf surface The number of stoma in unit area (mm2) ranged from 90.00 (Turşink) to 111.60 (Himdi). The stoma length and stoma width of the cultivars were measured in the range of 23.31 (Herişte) –32.03 (Foşa) and 19.20 (Cavreş)-26.78 (Foşa). The highest values in terms of stoma length and stoma width were determined in Foşa hazelnut variety. Among the hazelnut cultivars and types, Himdi had the highest stoma index (19.43%), while Cavreş had the lowest stoma index (13.26%). The number of epidermis cells in the leaves of the cultivars and types ranged from 462.82 to 612.46 stoma mm-2. Negative correlations were found between the number of stoma and stoma length (-0.684-0.358) and stoma width (-0.706-0.856). These results showed the hazelnut varieties and genotypes have different stomata characteristics. It has been observed that the best method for determining the stomata structures in hazelnuts is the method of transparency. © 2020, Centenary University. All rights reserved.