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Size and Frequency of Leaf Stomata in Cultivars of Triticum aestivum and Other Triticum Species¹

Lines of Triticum, representing diverse sources of germplasm, were characterized for stomatal frequency. Wheat leaf variation between the first, second, third, and fourth leaves on a tiller, sampling position at the base, center, and tip of each leaf, and sampling position in relation to adaxial or abaxial surface of the leaf were measured.

Stomatal frequency was always greater on the adaxial than on the abaxial surface. Mean ratios (abaxial/adaxial) were .748 for the first leaf and .728 for the second leaf on a culm. Frequencies ranged from 9,219 to 6,372 stomata cm^-2 for the adaxial and 8,024 to 3,487 for the abaxial surface of the first leaf. For the second leaf frequencies ranged from 8,875 to 4,597 for the adaxial and 8,172 to 3,487 for the abaxial surface. Stomatal frequency decreased in relation to position of leaf insertion on the culm. The first leaf had the greatest stomatal frequency, the second had the next greatest, and the fourth had the least. The leaf base contained the most, and the tip, the fewest stomata per unit of leaf area.

Plants grown on Cercosporella-inoculated plots had more stomata per unit of leaf area than did those grown on the control plots.

No general relation was found between grain yield and number of stomata cm^-2 of leaf surface nor between grain yield and bn (the product of stomata length and stomata per unit of adaxial leaf area).

Key Words: Cercosporella

² Associate Professor of Agronomy, Kansas State University, Manhattan, Kans. 66502; Agronomist, Plant Science Research Division, ARS, USDA, Pullman, Wash.; and Professor of Agronomy, Washington State University, Pullman, Wash. 99163, respectively.

Received for publication October 12, 1970.

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