Competitive ability of ALS-inhibitor herbicide-resistantFimbristylis miliacea
| Autor: | Nilda R. Burgos, Dirceu Agostinetto, J A Noldin, E. A. Alcober, C E Schaedler, Reiofeli A Salas |
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| Rok vydání: | 2015 |
| Předmět: |
Acetolactate synthase
Oryza sativa Ecotype media_common.quotation_subject Plant Science Biology Upland rice biology.organism_classification medicine.disease_cause Competition (biology) Agronomy Infestation biology.protein medicine Fimbristylis miliacea Weed Agronomy and Crop Science Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Weed Research. 55:482-492 |
| ISSN: | 0043-1737 |
| Popis: | Summary Fimbristylis miliacea, a weed in rice, has evolved resis-tance to acetolactate synthase (ALS) inhibitors. Thisstudy aimed to investigate the competitive abilities ofALS-resistant (R) and ALS-susceptible (S) F. miliaceawith rice. A replacement series experiment was con-ducted in the glasshouse at the Federal University ofPelotas, Brazil. The proportions of rice to F. miliaceawere 100:0, 75:25, 50:50, 25:75 and 0:100, with 1060plants m 2 . The experimental units were arranged in acompletely randomised design with four replications.A follow-up study was conducted at the University ofArkansas, Fayetteville, USA, in a split-plot designwith four replications. The main plot was species mix-ture (rice 9 R, rice 9 S, R 9 S). The subplot wascompetition partitioning (below- and above-ground,below-ground only, above-ground only and nointerspecific competition). Leaf area, plant height andshoot dry mass were recorded. Rice was more competi-tive than the R or S F. miliacea. In equal proportionsof rice and F. miliacea, regardless of ecotype, the rela-tive leaf area, height and dry mass of rice were greaterthan that of F. miliacea. The ALS-resistant ecotypewas less competitive with rice than the S ecotype.Intraspecific competition among rice plants was stron-ger than rice competition with F. miliacea. Competi-tion for below-ground resources was the most criticalaspect of interference among rice and F. miliacea.Inproduction fields, high infestation levels of F. miliacearesults in significant yield losses; thus, resistance toALS inhibitors needs to be curtailed.Keywords: Oryza sativa, weed competition, grass-likefimbry, globe fingerush, herbicide resistance.S |
| Databáze: | OpenAIRE |
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