ETHYLENE BIOSYNTHESIS FOLLOWING FOLIAR APPLICATION OF PICLORAM TO BIOTYPES OF WILD MUSTARD (SINAPIS-ARVENSIS L) SUSCEPTIBLE OR RESISTANT TO AUXINIC HERBICIDES

被引:27
作者
HALL, JC [1 ]
ALAM, SMM [1 ]
MURR, DP [1 ]
机构
[1] UNIV GUELPH, DEPT HORT SCI, GUELPH N1G 2W1, ONTARIO, CANADA
关键词
D O I
10.1006/pest.1993.1060
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
Following foliar application of picloram (100 g a.i. ha-1) to biotypes of wild mustard (Sinapis arvensis L.) resistant (R) or susceptible (S) to auxinic herbicides, ethylene and its precursors, ACC (1-aminocyclopropane-1-carboxylic acid) and MAAC (1-malonylaminocyclopropane-1-carboxylic acid), as well as ACC synthase were quantified. Severe epinasty occurred within 24 hr after picloram was applied to the S biotype with concomitant increases in ACC synthase, ACC, MACC, and ethylene. No epinasty occurred in the R biotype, nor was there an increase above basal levels of ACC synthase, ACC, MACC, and ethylene in this biotype. Both biotypes became epinastic when fumigated with 120 ·1 liter-1 of ethylene. Furthermore, when the tissues from both biotypes were supplied with exogenous ACC (1 mM) after pretreatment with aminooxyacetic acid (1 mM), an inhibitor of ACC synthase, both biotypes produced ethylene thereby indicating that ethylene-forming enzyme was not impaired in the resistant biotype. These results suggest that picloram-induced ethylene biosynthesis in the S biotype of wild mustard results from de novo synthesis of ACC synthase; however, this is not the case in the R biotype. Furthermore, sensitivity differences between the two biotypes are related to regulation of picloraminduced ethylene biosynthesis and resistance may be due to a different interaction of the herbicide with primary target site(s) such as the auxin-binding protein(s). © 1993 by Academic Press, Inc.
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页码:36 / 43
页数:8
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