Abstract
A study was made on the effect of increasing photon fluence rate (I) at a unilateral irradiation of adaxial (normal leaf position) and abaxial (inverse leaf position) blade surface of maize leaves of various insertion levels on net photosynthetic CO2 uptake (P n ) by the leaves, as well as the contribution of individual surfaces toP n of the leaves, and the significance of, or relationship between the stomatal (g s ) and intracellular (gm) conductances at the CO2 transport.P n of leaves of various age according to their insertion level was unaffected by the direction of incident irradiation. Upon irradiation of the leaves in normal and inverse position the contribution of the adaxial and abaxial surfaces toP n ,g s and gm was different. On irradiating the leaves in normal position, the contribution of the irradiated adaxial surface to the characteristics mentioned made on the average 55% of total values, the contribution of the abaxial surface irradiated in inverse position made on the average 70% inP n andg m , and 80% ing s . At lowerI’s g m was higher thang s both in irradiated and non-irradiated surfaces. The ratio ofg s to gm gradually got square with increasingI. In the irradiated adaxial surface the equilibrium (g s /g m = 1.0) took place at the highestI’s, in the irradiated abaxial surface between 500 to 1000 μmol m−2 s−1. The significance of the ratiog m in the CO2 transport through the individual surfaces is discussed.
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Václavík, J. Photosynthetic CO2 uptake byZea mays leaves as influenced by unilateral irradiation of adaxial and abaxial leaf surfaces. Biol Plant 26, 206–214 (1984). https://doi.org/10.1007/BF02895051
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DOI: https://doi.org/10.1007/BF02895051