不同水平磷对磷饥饿墨兰某些生化特性的影响

本文研究不同水平磷对磷饥饿墨兰［Ｃｙｍｂｉｄｉｕｍｓｉｎｅｎｓｅ（Ａｎｄｒ．）Ｗｉｌｌｄ］植株某些生化特性的影响．随着ＮａＨ２ＰＯ４浓度的增高，植株中的无机磷酸、磷脂酸、肌醇六磷酸、磷酸已糖、高能磷酸化合物和核酸等的含量都有不同程度的提高，其中以肌醇六磷酸提高最显著．酸性磷酸酯酶活性与磷浓度呈负相关．０．２０ｍｍｏｌ／ＬＮａＨ２ＰＯ４可能基本满足墨兰植株生长的要求．缺磷时叶片的蛋白质、无机磷酸和可溶性糖的含量较低，而游离氨基酸和淀粉的含量较高．因此，缺磷条件下生长的植株矮小的原因，可能主要是缺乏蛋白质。

INFLUENCE OF DIFFERENT PHOSPHORUS LEVELS ON SOME BIOCHEMICAL CHARACTERISTICS IN CYMBIDIUM SINENSE FOLLOWING PHOSPHORUS STARVATION

Influence of different phosphorus levels on some biochemical characteristics in phosphorus-starved Cymbidium sinense (Andr.) Willd. was studied. It was found that the amounts of inorganic phosphoric acid, phosphatidic acid, inositol hexaphosphate, hexose phosphate, high-energy phosphate compound and nucleic acid in plant were increased to different extent with increasing NaH2PO4 concentration. The acid phosphatase activity negatively related to phosphorus concentration, and NaH2PO4 at 0. 02 mmol/L may basically satisfy the requirement of the plant growth. We observed that leaf had lower contents of protein and soluble sugar and higher contents of free amino acid and starch during phosphorus deficiency. Hence, the reduction of plant height in C. sinense plant grown in Pi deficiency medium may primarily be caused by the deficiency of Plotein.