tailieunhanh - BIOLOGICALLY ACTIVE NATURAL PRODUCTS: AGROCHEMICALS - CHAPTER 3

Trong số 65 nhà máy thử nghiệm đối với tài sản allelopathic, velvetbean (Mucuna pruriens var. Utilis) đã được tìm thấy là ứng cử viên hứa hẹn nhất. Nó được công nhận rằng điều này cây họ đậu nhiệt đới phát triển cho phân xanh, có một khả năng đặc biệt để dập cỏ dại. Các thử nghiệm cho thấy âm mưu thử nghiệm có chứa velvetbean có dân số cỏ dại nhỏ nhất so với nhà máy cà chua trứng, lúa nương, và các điều kiện để đất hoang hóa. HPLC và tăng trưởng hạt giống nảy mầm và. | 3_ Allelopathy of Velvetbean Determination and Identification of L-DOPA as a Candidate of Allelopathic Substances Yoshiharu Fujii CONTENT Introduction Materials and Methods Results and Discussion References ABSTRACT Among the 65 plants tested for allelopathic properties velvetbean Mucuna pruriens var. utilis was found to be the most promising candidate. It is recognized that this tropical legume grown for green manure has a special ability to smother weeds. The field test showed that test plots containing velvetbean had the smallest weed population compared to that of tomato egg plant upland rice and fallow conditions. HPLC and seed germination and seedling growth bioassays showed that the growth inhibiting substance was L-3 4-dihydroxyphenylalanine L-DOPA . L-DOPA is a well known precursor of the neurotransmitter dopamine and is an intermediate of many alkaloids. This study revealed that velvetbean leaves and roots contain large amounts of L-DOPA about 1 of the fresh weight . L-DOPA suppressed the growth of some broad leaf weeds while little effect was observed on grasses. It was concluded that in addition to its usefulness as a green manure velvetbean could be utilized as an allelopathic crop to control weeds. KEY WORDS green manure phytotoxicity companion plants allelopathy bioassay weed control intercropping Introduction Velvetbean Mucuna pruriens L. DC. var. utilis or Stizolobium deeringianum Piper et Tracy is a tropical legume grown generally for green manure. It is recognized that velvetbean increases the yield of its companion graminaceous crops and that it smothers the growth of harmful weeds such as nutsedge Cyperus spp. and alang-alang Imperata cylindrica .1 2 1999 by CRC Press LLC A series of experiments was performed for the purpose of screening allelopathic plants with special emphasis on chemical interactions among them. The results of these experiments indicated that velvetbean was .