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International Research Journal of Agricultural Science and Soil Science

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Photosynthetic response of Egyptian cultivar of broad bean (Vicia faba L.) to UV-B and drought, singly and in combination

Abstract

Ibrahim A. Hassan, Hanan M. Aou Zeid, Jalal Basahi

Bean plants grown under field conditions were exposed to drought stress (DS) and supplementary ultraviolet-B radiation (sUV-B) singly and in combination (DS + sUV-B). The effects of these two stresses on net photosynthetic rate (PN), stomatal conductance (gs), quantum efficiency of photosystem II (ФPSII), variable to maximum chlorophyll (Chl) fluorescence (Fv/Fm), photochemical (qp) and non-photochemical (NPQ) Chl fluorescence, biomass and yield were investigated. PN, gs, chlorophyll (Chl) content, and NPQ were dramatically reduced due to exposure to DS by 54, 41, 29, and 12% and by 19, 19, 16 and 12% due to exposure to s UV-B, respectively. This reduction resulted in a change in assimilate allocation in favour of shoot growth leading to a decrease in root to shoot ratio and eventually to a decrease in relative growth rate (RGR) of both root and shoot. Seed yield was decreased by 27 and 23% due to DS and s UVB, respectively. Their interaction was more than additive. qp showed no significant response to sUV-B. There was antagonistic interaction between DS and sUB-V showing that DS effectively protects against the adverse effects of sUV-B

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