Abstract
Epidermal conductances for water vapour transfer(gep), water vapour efflux(E), and net photosynthetic CO2 uptake (P N ) through adaxial and abaxial leaf surfaces were estimated, simultaneously during the development of water stress in primary leaves ofPhaseolus vulgaris L. Hydration level was characterized by water saturation deficit (ΔW sat ), water potential (Τ w ), osmotic potential (Τ8) and pressure potential (Τp). The conductance of the abaxial epidermis was consistently greater than that of the adaxial epidermis, but the response of both surfaces to the increase in water stress corresponded: with increasing water stress epidermal conductances slightly increased, reached a plateau and then sharply decreased (at a rate of about 1.10x10-6 cm s-1 Pa-1 and 1.55x10-6 cm s-1 Pa-1 of Τw for adaxial and abaxial epidemics, respectively) to very low value. The curves expressing relationship between epidermal conductances and Δ Wsat, Τw, Τs, as well as Τp were of a similar character. E and PN through adaxial and abaxial surfaces were practically not affected until water stress reached the “critical” value (Τw from — 8.2 to — 9.2 x 105 Pa). With further increase in water deficit, however, they sharply decreased. The “critical” value of Τw was the same for both leaf surfaces.
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Solárová, J., Václavík, J. & Pospíšilová, J. Leaf conductance and gas exchange through adaxial and abaxial surfaces in water stressed primary bean leaves. Biol Plant 19, 59–64 (1977). https://doi.org/10.1007/BF02922488
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DOI: https://doi.org/10.1007/BF02922488