期刊
PEST MANAGEMENT SCIENCE
卷 77, 期 1, 页码 194-201出版社
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.6007
关键词
Echinochloa crus-pavonis; quinclorac resistance; quinclorac metabolism; quinclorac translocation
资金
- National Natural Science Foundation of China [31772183, 31672042]
- Jiangsu Agricultural Science and Technology Innovation Fund [CX (17) 3050]
- Jiangsu Foreign Expert Introduction Scheme [BX2019017]
- Grains Research and Development Corporation of Australia (GRDC)
The study on susceptible and resistant lines to quinclorac revealed that the resistant plants showed lower response in terms of up-regulating quinclorac metabolism and ethylene synthesis. The resistance is likely controlled by a single major gene, involving possibly an alteration in auxin signal perception/transduction. The beta-CAS gene is unlikely to play a major role in quinclorac resistance in this specific population.
BACKGROUND Barnyardgrass (Echinochloaspp.) is a global weed in rice fields. Quinclorac is commonly used to control barnyardgrass. However, due to persistent use, quinclorac resistance has evolved. We obtained quinclorac-susceptible (QS) and -resistant (QR1, QR2) lines from the progeny of a single resistantE. crus-pavonisfor a resistance mechanism study. RESULTS Line QR1 exhibited resistance to high quinclorac rates (up to 6400 g ha(-1)), whereas line QR2 exhibited a resistance/susceptibility segregation ratio of 3:1 at the field or lower rates (400, 100 g ha(-1)). Intriguingly, a lower level of(14)C-quinclorac metabolism and hence a higher level of(14)C-quinclorac translocation was observed in QR1 than QS plants. The basal expression levels of 1-aminocyclopropane-1-carboxylic acid (ACC) synthase (ACS) and ACC oxidase 2 (ACO2) genes did not differ significantly between the QR1 and QS lines. However, more expression ofACSandACOgenes was induced by quinclorac treatment in QS than in QR1. Basal levels of beta-cyanoalanine synthase (beta-CAS) gene expression were similar in QS and QR1 plants, but a greater level of down-regulation was detected in QS than in QR1 plants after quinclorac treatment. CONCLUSION These results indicate QR plants are less responsive to quinclorac than QS plants in terms of up-regulating quinclorac metabolism and ethylene synthesis. Resistance in thisE. crus-pavonisline is likely controlled by a single major gene, involving possibly an alteration in auxin signal perception/transduction to the ethylene biosynthesis pathway. The beta-CAS is unlikely to play a major role in quinclorac resistance in this particular population.
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