Effect of cyanazine herbicide on VA mycorrhizal infection and growth ofPisum sativum

Abstract

The effect of the photosynthetic inhibitor herbicide Cyanazine on VA mycorrhiza and on pea plant growth was examined. Plant growth was decreased by Cyanazine applied at the rate of 0.05 and 0.1 mg ml -~ . Cyanazine only decreased VA mycorrhiza of pea roots when applied at high doses (0.1 mg ml-l). However, no direct effect of the herbicide on VA endophyte development was found. These results suggest that the inhibitory effect of Cyanazine on VA mycorrhiza took place via influence on plant metabolism and growth.VA mycorrhizas alleviated the deleterious effect of the herbicide on plant growth when applied at moderate (0.05 mg ml ~ ) but not at high (0.1 mg ml-i) doses.

VA-mycorrhizae and mycorrhiza stimulating isoflavonoid compounds reduce plant herbicide injury

“…Such effects were more evident for imazaquin than for the other two herbicides studied. Similar results have been reported for sub-lethal doses of the photosynthesis-inhibiting herbicides carbamate and cyanazone (Dodd and Jeffries, 1989;Garcia-Romero et al, 1988;Ocampo and Barea, 1985) and for the hormone-herbicide MCPA (1-methyl-4-0-chlorophenoxy acetic) (GarcfaRomero and . VAM was equally effective in reducing herbicide injury and growth of corn in a imazaquin carryover soil.…”