Diversity Of Alpha-Tubulin Transcripts Inlolium Rigidum
PEST MANAGEMENT SCIENCE(2021)
摘要
BACKGROUND Tubulin, the target site of dinitroaniline herbicides, is encoded by small gene families in plants. To better characterize the mechanisms of target-site resistance to dinitroaniline herbicides in the globally important weedy speciesLolium rigidum, attempts were made to amplify and sequence alpha-tubulin transcripts. RESULTS Four alpha-tubulin isoforms (TUA1, TUA2, TUA3 and TUA4) were identified inL. rigidum. Variations in the number and sequence of transcripts encoding these alpha-tubulin proteins were found in individuals from the twoL. rigidumpopulations examined. Within and among populations, differences in the 5 '- and 3 '-untranslated regions of cDNA in TUA3 and TUA4 were identified. Furthermore, a novel double mutation, Arg-390-Cys+Asp-442-Glu, in the TUA3 transcript was identified and has the potential to confer dinitroaniline resistance. CONCLUSION This research reveals the complexity of the alpha-tubulin gene family in individuals/populations of the cross-pollinated weedy speciesL. rigidum, and highlights the need for better understanding of the molecular architecture of tubulin gene families for detecting resistance point mutations. Although TUA4 is a commonly expressed alpha-tubulin isoform containing most frequently reported resistance mutations, other mutant tubulin isoforms may also have a role in conferring dinitroaniline resistance.
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关键词
Tubulin, mutation, microtubule inhibitors, Lolium rigidum, dinitroaniline resistance
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