伊贝母根系分泌物自毒作用研究

采用生物测定的方法,研究了伊贝母(Fritillaria pallidifloraSchvek)根系分泌物及其主要成分1,3,5-三烯丙基-1,3,5-三嗪-2,4,6(1H,3H,5H)三酮、苯酚和二者的混合液对伊贝母生长的影响。结果表明,伊贝母根系分泌物对其种子萌发及胚根胚轴的生长有明显抑制作用,各浓度处理液对种子萌发及发芽势的影响多表现为抑制作用,随浓度升高而增强,但当超过一定浓度以后抑制作用有所下降。各浓度处理液对胚根胚轴生长的抑制作用表现为随浓度升高而增强,在较低浓度时对胚轴的生长表现为一定的促进作用。

Autotoxicity of Root Exudates of Fritillaria pallidiflora Schvek

Plant roots could secrete exudates which contain root-specific metabolites. Those metabolites have critical effect on the growth of the plant itself. Germination and early seedling growth bioassays were used to assess the autotoxicity potential of root exudates from Fritillaria pallidiflora Schvek in the present paper. The results indicated that the germination percentage, radical and hypocotyl length were inhibited by 1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione, phenols, and their mixtures, which are the main constituents of root exudates. The root exudates collected by the continuous cyclic device had effect on seed germination, and the autotoxicity were increased with higher concentration in a certain range and decreased beyond the range. The root exudates autotoxicity on its early seedling growth increased with higher concentration, however, they promoted the hypocotyl length of F.pallidiflora at lower concentration.