ANALYSIS OF ABAXIAL AND ADAXIAL STOMATAL REGULATION IN LEAVES OF PIMA COTTON (GOSSYPIUM BARBADENSE L.) USING THE 2DLEAF, TWO-DIMENSIONAL MODEL OF LEAF GAS EXCHANGE

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Leaf photosynthesis and transpiration of eight genotypes of Pima cotton (Gossypium barbadense L.) were measured in the field at the Maricopa Agricultural Center in August 1994. Microphotographs of leaf cross-section, and of the abaxial and adaxial surfaces of leaves taken from the same field were scanned and analyzed with the image analysis software. Selection process, as reflected in the sequence of the studied Pima cotton genotypes, did not significantly affect the leaf gas exchange or the leaf anatomical characteristics. Only the oldest variety, P32, had the parameters significantly different from those of the more recent lines. The data were used to parameterize and validate the 2DLEAF model developed earlier for two-dimensional modeling of leaf gas exchange and accounting for leaf anatomy. The model was used to study the effect on transpiration of the stomatal regulation on the abaxial and adaxial sides. The hypothesis about possible differences presented in several earlier studies with a number of species was confirmed in this study. At low stomatal aperture, the mode of stomatal closure at different leaf sides affects the transpiration rates more strongly than at higher values of stomatal openness. Transpiration rate is more sensitive to the abaxial stomatal closure, but the adaxial stomata play a more important role when the stomata are widely open.
九州大学の論文