Effects of glyphosate, chlorsulfuron, and methyl jasmonate on growth and alkaloid biosynthesis of jimsonweed (Datura stramonium L.)

被引:20
作者
Deng, F [1 ]
机构
[1] Virginia Polytech Inst & State Univ, Lab Mol Biol Plant Stress, Dept Plant Pathol Physiol & Weed Sci, Blacksburg, VA 24061 USA
关键词
alkaloid biosynthesis; chlorsulfuron; glyphosate; jimsonweed; methyl jasmonate; putrescine N-methyltransferase; RNA gel blot analysis;
D O I
10.1016/j.pestbp.2004.09.007
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The troublesome agronomic weed, jimsonweed (Datura stramonium L.), is also a major poisonous plant. The toxicity of jimsonweed is due to tropane alkaloids, which contain a methylated nitrogen atom (N-CH3) and include the anticholinergic drugs atropine, hyoscyamine, and scopolamine, as well as the narcotic cocaine. The enzyme and gene regulatory system of tropane alkaloid in plants is not clearly understood. The effects of the herbicides chlorsulfuron and glyphosate, and the growth regulator methyl jasmonate on the growth and alkaloid biosynthesis of jimsonweed were investigated. The growth responses of jimsonweed were characterized by determining the molar concentration of the herbicides required to inhibit plant root fresh weight by 50% (I-50). Chlorsulfuron and glyphosate inhibited root growth of jimsonweed seedlings; the I-50 was 8 x 10(-9) and 10(-7) M, respectively. Methyl jasmonate increased root growth of jimsonweed seedlings at 10(-6) and 10(-7) M, but was inhibitory at 10(-5) M. Tropane alkaloids are produced by the condensation of tropine and tropic acid, a phenylalanine-derived intermediate. Phenylalanine levels in jimsonweed seedlings were reduced by glyphosate and chlorsulfuron. Methyl jasmonate at 10(-8) M or greater concentrations induced phenylalanine levels in jimsonweed seedlings. Arginine and ornithine levels in jimsonweed seedlings were increased two to three times by chlorsulfuron and glyphosate, but reduced by methyl jasmonate. Contents of tropinone, phi-tropine, and tropine in jimsonweed seedlings were reduced by chlorsulfuron and glyphosate, but increased by methyl jasmonate at 10(-7) and 10(-6) M. Putrescine N-methyltransferase (PMT) is the first committed enzyme, which drives the flow of nitrogen away from polyamine biosynthesis to tropane alkaloid biosynthesis. The expression of PMT mRNA transcripts was reduced in jimsonweed roots treated with 10(-6) M chlorsulfuron and glyphosate. PMT mRNA transcripts of jimsonweed roots were greatly induced following treatment with 10(-7) M methyl jasmonate. These results indicate that methyl jasmonate enhanced PMT activity due to an increase of PMT mRNA. The effects of glyphosate and chlorsulfuron on PMT mRNA's transcriptional control and the accumulation of amino acid arginine/ornithine contents, coupled with their inhibitory effect on phenylalanine, tropinone, phi-tropine, and tropine levels, suggest that these herbicides might cause a decrease in overall tropane alkaloid biosynthesis in jimsonweed. However, the relationship between plant growth and metabolism affected by these compounds is not clear. (c) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:16 / 26
页数:11
相关论文
共 42 条
[1]   METHYL JASMONATE VAPOR INCREASES THE DEVELOPMENTALLY CONTROLLED SYNTHESIS OF ALKALOIDS IN CATHARANTHUS AND CINCHONA SEEDLINGS [J].
AERTS, RJ ;
GISI, D ;
DECAROLIS, E ;
DELUCA, V ;
BAUMANN, TW .
PLANT JOURNAL, 1994, 5 (05) :635-643
[2]  
[Anonymous], ALKALOIDS
[3]   WOUND-INDUCED CHANGES IN ROOT AND SHOOT JASMONIC ACID POOLS CORRELATE WITH INDUCED NICOTINE SYNTHESIS IN NICOTIANA-SYLVESTRIS SPEGAZZINI AND COMES [J].
BALDWIN, IT ;
SCHMELZ, EA ;
OHNMEISS, TE .
JOURNAL OF CHEMICAL ECOLOGY, 1994, 20 (08) :2139-2157
[4]   Methyl jasmonate upregulates biosynthetic gene expression, oxidation and conjugation of polyamines, and inhibits shoot formation in tobacco thin layers [J].
Biondi, S ;
Scaramagli, S ;
Capitani, F ;
Altamura, MM ;
Torrigiani, P .
JOURNAL OF EXPERIMENTAL BOTANY, 2001, 52 (355) :231-242
[5]   THE OCTADECANOIC PATHWAY - SIGNAL MOLECULES FOR THE REGULATION OF SECONDARY PATHWAYS [J].
BLECHERT, S ;
BRODSCHELM, W ;
HOLDER, S ;
KAMMERER, L ;
KUTCHAN, TM ;
MUELLER, MJ ;
XIA, ZQ ;
ZENK, MH .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1995, 92 (10) :4099-4105
[6]   Perspectives on glyphosate resistance [J].
Bradshaw, LD ;
Padgette, SR ;
Kimball, SL ;
Wells, BH .
WEED TECHNOLOGY, 1997, 11 (01) :189-198
[7]  
BUGOS RC, 1995, BIOTECHNIQUES, V19, P734
[8]   Characterization of 2,4-dichlorophenoxyacetic acid transport and its relationship with polyamines in Azospirillum brasilense [J].
Castro, S ;
Fabra, A ;
Mori, G ;
Rivarola, V ;
Giordano, W ;
Balegno, H .
TOXICOLOGY LETTERS, 1996, 84 (01) :33-36
[9]  
DENG F, 1998, J WEED SCI TECHNOL, V43, P208
[10]  
Deng Fan, 2004, Weed Biology and Management, V4, P49, DOI 10.1111/j.1445-6664.2003.00119.x