Herbicidal Characteristics of Dhelwangin Isolated from Agastache rugosa
2008
An, Xue-Hua (South-Central University for Nationalities, Wuhan, Hubei, China) | Li, Li-Zhong (South-Central University for Nationalities, Wuhan, Hubei, China) | Cho, K.M. (Chonbuk National University, Jeonju, Republic of Korea) | Kim, S.E. (Chonbuk National University, Jeonju, Republic of Korea) | Chun, J.C. (Chonbuk National University, Jeonju, Republic of Korea), E-mail: [email protected]
A series of experiments were conducted to elucidate herbicidal action characteristics of dhelwangin [4-hydroxy-6-methyl-3-(4-methyl-1-oxo-pentyl)-2H-pyran-2-one] isolated from Agastache rugosa. Dhelwangin did not affect seed germination. Reduction of chlorophyll content in maize and soybean as affected by 10mM dhelwangin was about 84% and 75%, respectively, which were very close to the level obtained with 0.1mM paraquat. The herbicidal activity of dhelwangin increased under light condition, but mode of action of dhelwangin was not likely to be associated with photosynthesis. Electrolyte leakage from soybean leaf disks incubated in dhelwangin solution was much greater than one from maize leaf disks. Elongation of oat coleoptile was completely inhibited at higher than 0.5mM dhelwangin. The results suggested that mode of action of dhelwangin was possibly related in part with destruction of cell membrane, resulting in inhibition of cell elongation.
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