Growth and mesostructure of the photosynthetic apparatus were studied in leaves of ten Triticum L. species. Plants with the Au genome were shown to develop larger leaf assimilation areas due to expanding areas of individual leaves and an increase in the absolute growth rate. Leaf and mesophyll thickness and mesophyll cell size decreased in the G-genome species. Leaf compactness, which depended on cell size and number per unit leaf area and leaf folding, determined the specific patterns of internal leaf organization in wheat species with diverse genotypes. These patterns did not affect cell plastid-to-cytoplasm ratio as shown by the stable indices of cell surface area/cell volume, cell surface area per chloroplast, and cell volume per chloroplast. The structural indices of leaf phototrophic tissues, mesophyll density, and mesophyll CO2 conductance in alloploids, as compared to diploid species, depended on both ploidy and genome constitution.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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