Environmental effects on the fitness of triazine-resistant and triazine-susceptible Brassica rapa and Chenopodium album in the absence of herbicide

brassica brassica campestris chenopodium chenopodium album clima climat climate drought stress fecundity fenotipos fertilidad fertilite fertility graine herbicidas herbicide herbicides natural selection ombrage phenotypes precipitation production de semences resistance to chemicals seed production seeds semilla shading triacina triazine triazines umbria water stress