Evaluation and Comparative Analysis of Natural Resistance to Glyphosate in Gossypium hirsutum races and Gossypium arboreum L.
While glyphosate makes weed management easy and efficient by controlling almost all emerged weeds,it severely influences the normal growth of cotton.The objective of this research was to evaluate natural glyphosate resistance by using tampons with different concentrations of glyphosate placed at specific positions on leaves of different plants and then rating the plants according to their reaction to glyphosate.The plants were graded into six levels of glyphosate resistance,with the range of the concentrations used (0.200％ vs 0.006％) being 33.3 times higher than those that could be used in practice.In particular,Gossypium hirsutum races,whose resistance was distributed across all six levels,had more variability in glyphosate resistance than Gossypium arboreum.However,nearly 86％ of G.hirsutum races had low or no tolerance to glyphosate while over 70％ of G.arboreum plants were tolerant,revealing that G.arboreum is more glyphosate tolerant overall.This was also supported by evidence that only two accessions of G.hirsutum exhibited high resistance to glyphosate while five germplasms of G.arboreum were highly resistant.Furthermore,one semi-wild accession of G.hirsutum was susceptible to glyphosate,but no susceptible plants were found for G.arboreum.These materials provide a base for further in-depth study of the genetic mechanism of glyphosate-resistance,glyphosate-resistant cotton breeding,and internal resistant gene mining.
国家科技期刊平台
NSTL
万方数据
维普
