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J Chem Ecol

Title:		"Ontogenic variation of biologically active metabolites ofPteridium aquilinum (L. Kuhn) pterosins A and B, and ptaquiloside in a bracken population of the tropical andes"
Author(s):		Alonso-Amelot ME; Perez-Mena M; Calcagno MP; Jaimes-Espinoza R; Castillo U;
Address:		"Laboratorio de Quimica Ecologica Departamento de Quimica Facultad de Ciencias, Universidad de Los Andes, 5101, Merida, Venezuela"
Journal Title:		J Chem Ecol
Year:		1992
Volume:		18
Issue:		8
Page Number:		1405 - 1420
DOI:		10.1007/BF00994365
ISSN/ISBN:		0098-0331 (Print) 0098-0331 (Linking)
Abstract:		"A negative correlation has been found between the amounts of pterosins A and B and ptaquiloside per biomass unit, and the growth stage of the blade of bracken. Their concentration decreased progressively from the crozierto the mature frond, where it attained less than 5% of the initial value. The growth was measured following the total blade length, its height, moisture content, and time of emergence from the soil surface. Quantitation of these compounds was achieved by HPLC using a water extraction, methylene chloride treatment, and silica gel microcolumn cleanup sequence. Pterosins were unevenly distributed in the blade, whereas ptaquiloside maintained a constant concentration throughout. Rhizomes contained only minor amounts of these compounds. Their possible role as semiochemicals in bracken is discussed"
Keywords:
Notes:		"PubMed-not-MEDLINEAlonso-Amelot, M E Perez-Mena, M Calcagno, M P Jaimes-Espinoza, R Castillo, U eng 1992/08/01 J Chem Ecol. 1992 Aug; 18(8):1405-20. doi: 10.1007/BF00994365"