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Root release and metabolism of organic acids in tea plants in response to phosphorus supply

文献类型： 外文期刊

作者： Lin, Zheng-He 1 ; Chen, Li-Song 1 ; Chen, Rong-Bing 3 ; Zhang, Fang-Zhou 3 ; Jiang, Huan-Xin 2 ; Tang, Ning 1 ; Smith, 1 ;

作者机构： 1.Fujian Agr & Forestry Univ, Coll Hort, Fuzhou 350002, Peoples R China

2.Fujian Agr & Forestry Univ, Inst Hort Plant Physiol Biochem & Mol Biol, Fuzhou 350002, Peoples R China

3.Fujian Acad Agr Sci, Tea Res Inst, Fuan 355015, Peoples R China

4.Univ Tennessee, Dept Biosyst Engn & Soil Sci, Knoxville, TN 37996 USA

关键词： citrate: 126-44-3;malate: 149-61-1;pyruvate kinase: PK;9001-59-6;EC 2.7.1.40;phosphorus: 7723-14-0;metabolism;NAD-malic enzyme: NAD-ME;9080-52-8;citrate synthase: CS;9027-96-7;EC 2.3.3.1;phosphoenolpyruvate carboxylase: PEPC;9073-94-3;acid metabolizing enzymes;phosphoenolpyruvate phosphatase: PEPP;122319-89-5;EC 3.1.3.60;NADP-isocitrate dehydrogenase: NADP-IDH;9028-48-2;enzyme activity;mineral nutrition;organic acid;deficiency adaptation

期刊名称：JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：3.549； 五年影响因子：4.164 ）

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收录情况： SCI

摘要： Self-rooted, 10-month-old, uniform tea [Camellia sinensis (L) O. Kuntze cv. Huangguanyin] plants were supplied for 17 weeks with 0, 40, 80, 160, 400, or 1000 mu M phosphorus (P) to investigate the effects of P supply on root citrate and malate release, the concentrations of malate and citrate and the activities of acid-metabolizing enzymes in leaves and roots. Root malate release and accumulation was induced by both 0 and 40 mu M P. while root citrate release and accumulation was induced only by 0 mu M P. Phosphorus-deficiency-induced malate and citrate release coincided with higher concentrations of root malate and citrate. The higher concentrations of malate and citrate were accompanied by increased activities of phosphoeno/pyruvate carboxylase (PEPC), phosphoenolpyruvate phosphatase (PEPP), citrate synthase (CS) and NAD-malic enzyme (NAD-ME) and decreased activities of pyruvate kinase (PK). NADP-ME and NADP-isocitrate dehydrogenase (NADP-IDH) in roots. In contrast to roots, malate accumulated in the leaves only in response to 0 mu M P. and no change was observed in citrate levels. The P-deficiency-induced leaf malate accumulation coincided with increased activities of NADP-ME. NAD-ME and PK. Overall, the P-deficiency-induced changes in organic acid (OA) metabolism differed between roots and leaves. The high tolerance of tea plants to P-deficiency might be involved in two major processes: (a) increasing the availability of P by inducing root release of OA anions; and (b) improving the ability to use P efficiently by inducing bypass enzymes involved in tissue P economy

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