Jul 22, 2008 Leaf stomatal density and the stomatal index (the percentage of stomatal number to total cell number on a given leaf area) may be affected by cell expansion, depending on leaf development, ageing, and position (Ceulemans et al., 1995; Lecoeur et al., 1995). Thus, both guard cell and epidermal cell numbers per unit area of a small leaf at a later plant growth stage would be expected to increase.
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