Physiological Fitness Associated to ACCase Target-Site Resistance Enhances Growth and Reproduction in Phalaris brachystachys

Short-spike canarygrass (Phalaris brachystachys (Link.)) from Iranian wheat fields has developed resistance to acetyl-coenzyme A carboxylase (ACCase) inhibitors due a target-site mutation (Ile-1781-Thr). Target-site mutations may confer pleiotropic effects in weeds. In this paper, the possible effect of Ile-1781-Thr on ecological fitness during life cycles P. plants was investigated. ACCase genes populations resistant (R) and susceptible (S) were sequenced vegetative growth reproductive characteristics assessed. final stage (217 days after planting—DAP), R sub-population 30 cm taller than S plants. Additionally, produced up 12 leaves 2.8 tillers more per plant, accumulated double dry weight (2850 g m−2) compared sub-population. The leaf area index (LAI) 1.1 times higher that addition, net assimilation rate (NAR) plant (PGR) between 114 182 DAP 0.11 13 m−2 d−1 sub-population, but relative (RGR) similar sub-populations. number spikes (6 vs. 3.8), spike length (8.4 5.5), seeds (1276 751 seed plant−1) ones, (3.25 g) size (11.6 mm2) 1000 populations. exhibited parameters one, which increase frequency population absence adequate weed-control methods.