Effects of aluminum speciation on wheat root growth and its enzyme activity

Abstract

Abstract: Aluminum speciation is recognized to associate with environmental pH.In this paper,the effects of aluminum speciation (Al_a,Al_b) on the growth,protein content,acid phosphatase (AP) activity of wheat root were studied by changing the pH of aluminum solutions.Two concentrations of total aluminum,25 μmol·L^-1 (T₁) and 75 μmol·L^-1 (T₂),were set up in the test solutions,and four levels of pH,4.0,4.5,5.0 and 5.5,were regulated for each solution.The results indicated that the growth of wheat root in T₁ and T₂ was strongly inhibited by low doses of Al_a and Al_b,while the changing trend of protein content and AP activity varied when exposed to different composition of active Al.When the Al_a concentration was above 90% of the active Al concentration,the protein content was reduced while the AP activity was enhanced by Al at pH 4.0,but it was reverse at pH 5.0 when the concentration of Al_a and Al_b was below 10 μmol·L^-1,respectively.

Key words: Wheat, Aluminum speciation, Acid phosphatase (AP), Protein

CLC Number:

X173

ZHU Xuezhu, HUANG Yao, ZONG Lianggang, KONG Fanxiang . Effects of aluminum speciation on wheat root growth and its enzyme activity[J]. Chinese Journal of Applied Ecology, 2005, 16(6): 1043-1046.

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