Tillers Do Not Influence Phytotoxicity of Imazamethabenz in Wild Oat (Avena fatua) |
| |
Authors: | J F Chao A I Hsiao W A Quick |
| |
Institution: | (1) Department of Biology, University of Regina, Regina, SK S4S 0A2, CA;(2) Agriculture and Agri-Food Canada, Research Station, Box 440, Regina, SK S4P 3A2, Canada, CA |
| |
Abstract: | The response of wild oat to imazamethabenz varies with the growth stage, but the role of tillers in this regard is unclear.
Removal of tillers at the three-leaf stage before spraying with imazamethabenz did not significantly affect the total shoot
fresh weight measured 3 weeks later. The leaf area and dry weight of intact plants at the three-leaf stage were 17–21% greater
than for plants with coleoptilar and first leaf main shoot tillers (T0 and T1) removed. The greater leaf area may have increased
herbicide interception per plant. Similar fresh weight reductions in main shoot, total tillers, and total shoots were found
whether imazamethabenz was applied to the plant at the two-leaf without tillers or the three-leaf with two tillers stage.
Imazamethabenz applied only to the main shoot reduced total shoot dry weight more than an equivalent amount of imazamethabenz
applied only to tiller T1 or applied over the whole shoot. Imazamethabenz had the least inhibitory effect on whole plant growth
when applied only to T1. When 14C-herbicide was applied to the first main shoot leaf of plants at the three-leaf stage with two tillers, the 14C translocated 38% to roots, 33% to the main shoot, and nearly 30% to all tillers. When 14C-herbicide was applied to the first leaf of T1 then the 14C translocated 50% to T1, 25% to the main shoot, 20% to roots, and 5% to all other tillers. The translocation pattern and
fresh weight values suggested that the presence of early tillers during herbicide application neither increased nor decreased
imazamethabenz efficacy in wild oat.
Received June 4, 1997; accepted June 5, 1997 |
| |
Keywords: | , Tillering—,Translocation—,Phytotoxicity—,Tiller removal |
本文献已被 SpringerLink 等数据库收录! |
|