喷施亚硫酸氢钠溶液对缺硫脐橙光合生理特性的影响

用营养液培养的方法，研究了施NaHSO₃溶液对缺硫脐橙光合生理特性的影响.结果表明,与对照相比,缺硫、缺硫+NaHSO₃溶液半程处理的脐橙叶片光合色素含量、可溶性蛋白质含量、净 光合速率(P_n)、初始荧光(F_o)、最大荧光(F_m)、光化学效率(F_v/ F_m)和电子传递速率(ETR)显著下降，处理35 d后光合色素含量分别下降了23.45%和11.32%,可溶性蛋白质含量分别下降了43.43%和25.30%，但缺硫+NaHSO₃溶液全程处理与对照间差异不大,说明可通过叶面喷洒NaHSO₃溶液的方式为植物提供硫元素，但当植株经长时间缺硫胁迫后，这种方式将难以矫正其缺硫症状.

Effects of foliage spraying sodium bisulfite on photosynthetic physiological characteristics of Citrus sinensis with sulphur deficiency

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 (Pn), initial fluorescence (Fo), maximum fluorescence (Fm), photochemical efficiency (Fv/Fm) and electron 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 throughout 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.