Abstract: The study with solution culture showed that Citrus sinensis plants with sulphur deficiency and with sulphur deficiency plus foliage spraying sodium bisulfite (NaHSO₃) halfway had notably decreased photosynthetic pigment content, soluble protein content, net photosynthetic rate (P_n), initial fluorescence (F_o), maximum fluorescence (F_m), photochemical efficiency (F_v/F_m) and el-ectron transmit rate (ETR), compared with those having normal sulphur supply. After 35 days of growth, their photosynthetic pigment content decreased by 23.45% and 11.32%, and soluble protein content decreased by 43.43% and 25.30%, respectively, while no significant differences were observed between the plants with sulphur deficiency plus foliage spraying NaHSO₃ throu-ghout the experiment and those having normal sulphur supply, suggesting that foliage spraying NaHSO₃ could be an effective way to supply sulphur element to the C. sinensis with sulphur deficiency, but hard to rectify sulphur deficiency symptom when the plants suffered from a severe sulphur deficiency stress for a long time.

Key words: Molecular cultivation science, Rice, Developmental genetics, Molecular ecology