J Integr Plant Biol. ›› 1999, Vol. 41 ›› Issue (8): -.

• Research Articles •    

Distribution of Rare Earth Elements and Structure Characterization of Chlorophyll-Lanthanum in a Natural Plant Fern Dicranopteris dichotoma

HONG Fa-Shui, WEI Zheng-Gui, TAO Ye, WAN Shou-Kang, YANG Yue-Tao, CAO Xin-De and ZHAO Gui-Wen   

Abstract: The distribution pattern of La, Ce, Nd, Th, Dy was in the order as leaf > root > stem, that of Pr, Sm, Eu, Cd, Ho, Y was as root > leaf > stem in fern Dicranopteris dichotoma Underw. Light and moderately heavy rare earth elements were easily selectively absorbed and then accumulated by the fern D. dichotoma. Many mainly light rare earth elements are bound to chlorophyll in D. dichotoma. Among the 15 detectable rare earth elements binding to chlorophyll, lanthanum content (50.08 % ) was the highest, and cerium content (19.40%) is the second of all. FXAFS (Fluorescence X-ray absorption fine structure) spectral analysis revealed that lanthanum coordinated 2 porphyrin rings and La-chlorophyll-a may have bilayer structure in D.d/chotoma.

Key words: Dicranopteris dichotoma, Rare earth element, La-chlorophyll-a

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