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(A–D) Effects of water stress on chlorophyll, proline, total protein, and thiobarbituric acid reactive substances (TBARS) content at different development stages of A. annua. EVS, early vegetative stage; FW, fresh weight; LVS, late vegetative stage; PGS, plant growth stage; PFS, preflowering stage; FS, flowering stage; C, control; MS, moderate stress; SS, severe stress.
