000			03050nab a2200313 i 4500
003			BR-BrBNA
005			20230925110850.0
008			230808b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60 _b0150
100			_aPiveta, L.B.
100			_aRoma-Burgos, N.
100			_aNoldin, J.A.
100			_aRefatti, J.P.
100			_aOliveira, C.
100			_aAvila, L.A.
245			_aResponse of imidazolinone-resistant and -susceptible weedy rice populations to imazethapyr and increased atmospheric CO2
500			_aPublicação on-line; 46 ref.; 3 tables; 2 illus.; Summary (En)
520			_a ABSTRACT Background: Weedy rice (Oryza sativa L.) is the main weed of rice crop. The high genetic variability of weedy rice contributes to the high phenotypic diversity between biotypes and different responses to environmental stress. Objective: The present study aimed to evaluate the response of imidazolinone-susceptible and -resistant weedy rice populations to increased atmospheric [CO2]. Methods: The experiment was arranged in a complete randomized design with six replications. The treatments included two [CO2] concentration (700 and 400 μmol mol-1) and three treatments: resistant genotype (IMI-resistant) treated with imazethapyr; resistant genotype without imazethapyr, and a susceptible genotype without imazethapyr. Results: The IMI-resistant and –susceptible weedy rice responded similarly to [CO2] enrichment. Enhanced [CO2] increased competitive ability of the weedy rice populations tested, by means of increased plant height. Weedy rice seed production also increased with enhanced [CO2] by means of increased photosynthesis rate and reduced transpiration (increased water use efficiency). Increased seed production also means increased weed persistence as it increases the soil seedbank size. The application of imazethapyr on IMI-resistant weedy rice did not alter its response to [CO2]; conversely, increased [CO2] did not change the resistance level of weedy rice to imazethapyr. High [CO2] increased spikelet sterility, but this beneficial effect was negated by the overall increase in production of filled grains. Conclusions: Enhanced [CO2] concentrations increases weedy rice growth, photosynthesis rates, seed production and spikelet sterility; the imidazolinone application does not affect the response of weedy rice to enhanced [CO2] affects weedy rice response to imidazolinone herbicide Keywords: climate change ecology weed biology
650			_aERVA DANINHA
650			_aORYZA SATIVA
650			_aMUDANÇA CLIMÁTICA
650			_aECOLOGIA
650			_aBIOLOGIA VEGETAL
773	0		_0886 _91817 _dLondrina-PR : Sociedade Brasileira da Ciência das Plantas Daninhas, 1978 _o2023-031024 _tPlanta Daninha (Brazil) _x0100-8358; 1806-9681 (on-line) _gv. 38 p. 1-9; (2020) _wBR2023000851
856			_uhttps://www.scielo.br/j/pd/a/wVRqsfhHX5VB4bF89g7hDSq/?format=pdf&lang=en
942			_cAnalítica
999			_c9766 _d9766