Morpho-Physiological Diversity and Its Association with Herbicide Resistance in Echinochloa Ecotypes

Abstract The genus Echinochloa constitutes some of the most prominent weed species found in rice ( Oryza sativa L.) production worldwide. taxonomy is complex due to its morphological variations. morpho-physiological diversity and taxonomic characteristics ecotypes infesting fields Texas are unknown. A total 54 collected during late-season field surveys 2015 2016 were characterized a common garden 2017. Plants for 14 traits including stem angle; color; plant height; leaf texture; flag length, width, days flowering; panicle length; biomass; seed shattering; yield; dormancy. Principal component analysis indicated that four (plant height, shattering, germination) phenological here had significantly contributed overall spp. Results showed wide inter-population measured among E. colona ecotypes, as well diverse intra-population variability all three Echinochola studied, barnyardgrass [ crus-galli (L.) P. Beauv.], junglerice Link], rough muricata (P. Beauv.) Fernald]. Taxonomical classification revealed collection consisted species, with being dominant (96%), followed by E . (2%), (2%). Correlation resistance status commonly used preemergence (clomazone, quinclorac) postemergence herbicides (propanil, quinclorac, imazethapyr, fenoxaprop-ethyl) failed show any significant association. Findings from this study provided novel insights into Texas. currently present could contribute their adaptation selection pressure imposed different management tools, emphasizing need diversified approach effectively control species.