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Contribution of militarine and dactylorhin A to the plant growth‐inhibitory activity of a weed‐suppressing orchid, Bletilla striata
Author(s) -
SAKUNO EMI,
KAMO TSUNASHI,
TAKEMURA TOMOKO,
SUGIE HAJIME,
HIRADATE SYUNTARO,
FUJII YOSHIHARU
Publication year - 2010
Publication title -
weed biology and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 36
eISSN - 1445-6664
pISSN - 1444-6162
DOI - 10.1111/j.1445-6664.2010.00385.x
Subject(s) - biology , weed , ornamental plant , inhibitory postsynaptic potential , radicle , botany , methanol , allelopathy , horticulture , germination , chemistry , organic chemistry , neuroscience
The methanol extract of Bletilla striata , an ornamental orchid in eastern Asia, exhibited plant growth‐inhibitory activity. It was purified by continuous chromatography, based on the inhibitory activity against the growth of lettuce seedlings, resulting in two glycosidic compounds, militarine and dactylorhin A. The EC 50 values of militarine and dactylorhin A against the radicle elongation of the lettuce seedlings were 0.28 and 0.88 mmol L −1 , respectively. The amount of militarine and dactylorhin A in the methanol extract of the aerial part of B. striata was calculated to be 5.6 and 7.5 mg g −1 fresh weight, respectively. The inhibitory activity of militarine and its content in the methanol extract revealed that the plant growth‐inhibitory activity of the extract of B. striata was mainly related to militarine. The inhibitory activity of militarine against the growth of Italian ryegrass and timothy were of the same level as that of lettuce.