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Relationship between the Changes of Acid Phosphatase Activities and Pi-uptake of Tomato Seedlings during Phosphate Starvation

SONG Ke-Min 1 JIAO Xin-Zhi 2 LI Lin 2 YAN Ji-Qiong 3 ( 1Department of Agronomy, Huazhong Agricultural University,Wuhan 430070) ( 2Shanghai Institute of Plant Physiology, The Chinese Academy of Sciences,Shanghai 200032) ( 3Department of Biol  
The acid phosphatase activities from roots and both stems and leaves of tomato seedlings all increased markedly under phosphate starvation. Phosphate starvation also increased the activities of acid phosphatase from cell surface of, and released by roots of tomato seedlings. The kinetic analysis of acid phosphatase of roots of tomato seedlings revealed that phosphate starvation increased the affinity of the enzyme to its substrate. The results also revealed that phosphate starvation had no effect on the optimum pH (pH 4 93) of the acid phosphatase of roots of tomato seedlings. It was also found that molybdate strongly inhibited not only the activities of acid phosphatase but also Pi-uptake rates of tomato seedlings. All the results indicated that the adaptive changes of Pi-uptake of tomato seedlings during phosphate starvation may closely associate with the changes of the activities of acid phosphatase of the roots, especially those from cell surface of, and released by the roots of the seedlings.
【Fund】: 国家自然科学基金
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