盐胁迫下琯溪蜜柚苗木生理生化特性的变化研究

水培试验研究了不同浓度盐胁迫下琯溪蜜柚苗木生理生化特性的变化。结果表明,盐胁迫下溪蜜柚苗木根系活力、叶片相对含水量(RWC)、叶片细胞汁液pH、光合色素含量及氨基酸含量降低,大分子渗漏值及丙二醛(MDA)含量增加,且它们之间均呈显著和极显著相关性。琯溪蜜柚植株根系活力及叶片MDA含量对盐胁迫较敏感,根系活力下降可能是柚植株受盐胁迫后最早的伤害反应。

Studies on the physiological and biochemical characteristics of Guanximiyou pomelo plants under salt stress

Changes of physiological and biochemical characteristics of Citrus grandis Osbeck cv.Guanximiyou plants under salt stress were studied in hydroponics culture experiments.The results show that with the increase of salinity and treated time,the root vitality,relative water content(RWC),pH value of cell sap in leaves and the contents of photosynthetic pigments and amino acid decrease,but the macromolecule leakage value and the content of malondialdedyed(MDA)in leaves increase.There is a significant correlation between physiological and biochemical characteristics.The root vitality and the content of MDA in leaves are sensitive to salt stress and the decrease of root vitality may be the earliest response of Guanximiyou pomelo plants to the salt stress.