Abstract:

Aluminum toxicity is known as an important factor that affects the growth of crops in acid soil. The in-vestigation into the Al in biological samples is helpful to reveal the form and transportation of Al in crops. In this paper , the nondestructive ²⁷AlNMR with high accuracy is adopted to analyze the forms of Al in the roots , stems and leaves of soybean (Glycine mαx) cv Huanchun No. 18. The results show that (1) the Al in soybean roots is mainly
chelated to malate and citrate in the forms of Al-malate (1: 3) and Al-citrate (1: 1) complexes , whose chemical shifts are respectively 11. 16 and -0.38 , (2) no Al-organic acid complexes are found in soybean stems or leaves , and (3) the dissoluble Al in soybean roots , stems and leaves mainly exists in the form of [AI0₄ Al₁₂(OH)₂₄ (H₂0) ₁₂] ,whose chemical shift is 63.2.

Key words: aluminum, soybean, ²⁷AINMR, form, organic-acid complex