Herbicidal potential of pseudoguaninolide sesquiterpenes on wild oat, Avena fatua L

The inhibitory effects of five pseudoguaninolide sesquiterpenes—neoambrosin, damcinic acid, damsin, ambrosin and hymenin—isolated from the aerial parts of Ambrosia maritima were evaluated on seed germination and seedling growth of wild oat, Avena fatua L. The tested sesquiterpenes caused pronounced...

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Bibliographic Details
Published in:Biochemical systematics and ecology 2012-10, Vol.44, p.333-337
Main Authors: Saad, Mona M.G., Abdelgaleil, Samir A.M., Suganuma, Toshihiko
Format: Article
Language:English
Subjects:
acids
aerial parts
Ambrosia
Ambrosia maritima
Avena fatua
Herbicidal activity
imazamethabenz
Pseudoguaninolide sesquiterpenes
root growth
roots
seed germination
seedling growth
sesquiterpenoids
shoots
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Summary:The inhibitory effects of five pseudoguaninolide sesquiterpenes—neoambrosin, damcinic acid, damsin, ambrosin and hymenin—isolated from the aerial parts of Ambrosia maritima were evaluated on seed germination and seedling growth of wild oat, Avena fatua L. The tested sesquiterpenes caused pronounced reduction in seed germination, particularly at the higher concentrations of 1 and 2mM. Damsin was the most potent compounds with seed germination percentage of 16.7% at 2mM. The results of seedling growth test showed that the sesquiterpenes are potent inhibitors of root growth and ambrosin and damsin were the most potent compounds with EC50 values of 0.22 and 0.24mM, respectively. Similarly, strong inhibition of shoot growth was observed with ambrosin (EC50=0.30) being the most active compound. Nevertheless, the inhibition of root growth by all compounds was greater than that of shoot growth. Interestingly, the five tested sesquiterpenes showed greater inhibitory effect on germination, root and shoot growth than a reference herbicide, imazamethabenz. [Display omitted] ► Five pseudoguaninolide sesquiterpenes were isolated from Ambrosia maritima. ► The isolated compounds revealed strong herbicidal activity against Avena fatua. ► Damsin and ambrosin caused the highest inhibitory effect on growth parameters.
ISSN:0305-1978
1873-2925
DOI:10.1016/j.bse.2012.06.004