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Leaf growth is a complex developmental process controlled by genetic and environmental factors and is determined by a proliferation, expansion and maturation phase. Mutational analysis in Arabidopsis thaliana showed that leaf size and shape is dependent on cell division and cell expansion activity. An investigation was made at the cytophysiological and ultrastructural level of the elo1 mutant of Arabidopsis thaliana, which is defective in one of the components of the histone acetyl transferase Elongator complex and displays a distinct 'narrow leaves' phenotype, owing to a reduced cell number and no transition between petiole and lamina. Relative expression levels of three sucrose metabolism/transport-related genes were also investigated. The aim was to determine the physiological basis of leaf morphology in this mutant, by investigating the modulatory role of sucrose.

Cytological Investigations of the Arabidopsis thaliana elo1 Mutant Give New Insights into Leaf Lateral Growth and Elongator Function