1Korea Research Institute of Bioscience & Biotechnology (KRIBB), Cheongwon-gun, Korea.
2ReSEAT Program, Korea Institute of Science and Technology Information, Daejeon, 305–806, Korea
Department of Crop Science, College of Agriculture & Life Sciences Chungnam National University, 79 Daehangno, Yuseong-gu, Daejeon, 305–764, Korea.
*Correspondence author: E.Mail: supark@cnu.ac.kr
Online published on 7 November, 2012.
Inhibition of chlorophyll fluorescence and growth by sorgoleone in several weed species was investigated under in-vivo conditions. Sorgoleone applied to 21-day-old weed seedlings significantly reduced the Fv/Fm value in all weed species both in leaf disc test and greenhouse study. Sorgoleone applied to 21-day-old weed seedlings significantly reduced the Fv/Fm value in all test weed species both in leaf disc test and greenhouse study. In leaf disc experiment, Galium spurium, Aeschynomene indica and Rumex japonicus were the most sensitive species to sorgoleone and the sorgoleone at 200 μg ml-1 at 6-h after application drastically reduced their chlorophyll fluorescence and Fv/Fm values by 93, 88 and 84%, respectively. In greenhouse study, A. indica proved the most sensitive specie in terms of changes in Fv/Fm values in both dose response and time series experiments. The sorgoleone at 200 μg ml−1 at 120 h after application, reduced the Fv/Fm values by 93, 90 and 82% in A. indica, G. spurium and R. japonicus, respectively. At 200 μg ml-1 sorgoleone, the growth of most broadleaf weed species was reduced drastically (80%) and the maximum inhibition (100%) was observed in R. japonicus, G. spurium and A. indica. Chlorophyll fluorescence measurement is useful to evaluate mode of sorgoleone action in test weed species.
Aeschynomene indica, chlorophyll fluorescence, Galium spurium, mode of action, natural products, Rumex japonicus, sorgoleone, weeds
