Journal
PHYTOCHEMISTRY
Volume 55, Issue 2, Pages 131-140Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0031-9422(00)00264-8
Keywords
Sphenoclea zeylanica; Sphenocleaceae; gooseweed; alleiopathy; plant growth inhibitor; secoiridoid glucoside; thiosulfinate; 4-hydroxy-3-hydroxymethyl-1,2-dithiolane-1-oxide; 4-hydroxy-3-hydroxymethyl-1,2-dithiolane-2-oxide
Categories
Ask authors/readers for more resources
Nine plant growth inhibitors were isolated from the tropical weed Sphenoclea zeylanica, which shows allelopathic properties. Those compounds hitherto not reported from any plant source were the isomers of cyclic thiosulfinate, (1S,3R,4R)-(+)- and (1R,3R,4R)-(-)-4-hydroxy-3-hydroxymethyl-1,2-dithiolane-1-oxides, and (2R,3R,4R)-(-)- and (2S,3R,4R)-(+)-4-hydroxy-3hydroxmethyl-1,2-dithiolane-2- oxides. These were named zeylanoxide A, epi-zeylanoxide A, zeylanoxide B and epi-zeylanoxide B, respectively. The absolute configurations at C-3 and C-4 were elucidated by chemical synthesis of both enantiomers from L- and D-glucose. Two of the inhibitors were secologanic acid and secologanoside, and three other inhibitors were by known secoiridoid glucosides formed as artifacts during extraction with methanol. The cyclic thiosulfinates and secoiridoid glucosides completely inhibit the root growth of rice seedlings at 3.0 mM. While the specific activity of the inhibitors was not high, since they accumulated to circa 0.61% S. zeylanica by dry weight, this suggests that the inhibitors are nevertheless potent allelochemicals in this weed. (C) 2000 Elsevier Science Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available