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Culm Length and Differential Development of Three Foliar Leaves of Near-Isogenic Wheat Lines¹

Five near-isogenic lines of wheat seedlings that differed in culm length and their two parents were studied to establish the relationship of culm length phenotype and genotype with differential development of the first, second, and third seedling leaves. Differential development of the corresponding leaves of these selections is generally positively related to culm length expression. Indirect evidence suggests that the genetic mechanisms which control culm length also control leaf development or that closely linked systems are inwflved. Furthermore, differential leaf development is brought about by differential elongation of leaf mesophyll parenchyma cells. Differential development of the leaves of the same selection seems more dependent upon differential parenchyma cell number rather than length of leaf parenchyma cells. On a per-unit-length basis, leaves of the short selections possessing semidwarfing genes are heavier than those carrying no semidwarfing genes, suggesting some physiological limitation for semidwarf selections to produce maximum cell elongation.

² Reader in Plant Breeding and Genetics, West Pakistan Agricultural University, Lyallpur, West Pakistan, and Geneticist, Crops Research Division, ARS, USDA, Pullman, Washington.

Received for publication January 27, 1965.