Physiological responses of Robinia pseudoacacia seedlings to drought stress

Physiological response of different species to drought stress can help to recognize the effective mechanisms in drought stress and choose the best species for planting in dry lands of Iran. This study investigated the physiological mechanisms of Robinia pseudoacacia L. seedlings in draught conditions. An experiment was carried out in a completely randomized block with one treatment (irrigation) at five levels (1, 3, 5, 7, and 9 -day intervals) with five replicates in one-year-old seedlings of Robinia pseudoacacia L. The effects of drought stress, chlorophyll fluorescence parameters (Fv/Fm, Fm & F0), pigments concentrate (total chlorophyle, chlorophyle ‘a’ and ‘b’), and proline content of leaves were measured with sampling from leaves of mentioned treatments. Drought stress caused a significant reduction in maximum photochemical efficiency of photosystem II (Fv/Fm), maximum fluorescence (Fm) and minimum fluorescence (F0) (p