Gamma-rays in the development of rice lines tolerant to aryloxyphenoxypropionate herbicides.

Mutation breeding, genetic diversity and crop adaptation to climate change Pub Date : 1900-01-01 DOI:10.1079/9781789249095.0029

A. de Andrade, A. Tulmann Neto, F. Tcacenco, R. Marschalek, Adriana Pereira, A. M. de Oliveira Neto, K. Scheuermann, E. Wickert, J. A. Noldin

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Abstract

Abstract The aryloxyphenoxypropionate (APP) herbicides are graminicides with excellent control of many grass weed species, including weedy rice (Oryza sativa L.). These herbicides block fatty acid biosynthesis by inhibition of the enzyme acetyl-CoA carboxylase (ACCase) and cause death of the plant. Through induced mutation of rice seeds with gamma-rays, rice lines resistant to APP have been developed. Plant dose-response assays confirmed resistance to the APP herbicides quizalofop-p-ethyl and haloxyfop-p-methyl. The carboxyl-transferase (CT) domain fragments of ACCase from the resistant line and the susceptible control were sequenced and compared. A point mutation was detected in the amino acid position 2027. Results indicated that resistance to APP herbicides is a consequence of an altered ACCase enzyme that confers resistance. APP-resistant rice provides an option to improve the efficiency of weed management in rice crops.

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抗芳氧苯氧丙酸除草剂水稻株系发育中的伽马射线。

摘要芳氧苯氧丙酸(APP)除草剂是一种禾草除草剂，对杂草水稻(Oryza sativa L.)等多种杂草具有良好的防治效果。这些除草剂通过抑制乙酰辅酶a羧化酶(ACCase)来阻断脂肪酸的生物合成，导致植物死亡。通过伽玛射线诱变水稻种子，培育出抗APP的水稻品系。植物剂量反应试验证实对APP除草剂quizalofop-p-ethyl和haloxyfoop -p-methyl具有抗性。对抗性品系和敏感对照的ACCase羧基转移酶(CT)结构域片段进行了测序和比较。在氨基酸位置2027检测到一个点突变。结果表明，对APP除草剂的抗性是一种赋予抗性的ACCase酶改变的结果。抗app水稻为提高水稻杂草管理效率提供了一种选择。

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Mutation breeding, genetic diversity and crop adaptation to climate change

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