Abstract
Background Gomphrena perennis (Gpe) and G. pulchella (Gpu) are perennial glyphosate-tolerant amaranthaceous weeds of central and northern Argentina where glyphosate-resistant soybeans are grown with no-till. The study of weeds leaves morphoanatomy is important to understand environmental adaptation and could be used to explain herbicide absorption. Leaf surfaces of Gomphrena species were previously described for phylogenetic studies, and morphoanatomy of two Gomphrena perennis populations was characterized for glyphosate tolerance. There are no reports on comparative studies of Gpe and Gpu. [...]
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