000			02881nab a2200301 i 4500
003			BR-BrBNA
005			20230921171207.0
008			230801b2020 bl.ar|pooa||| 00| 0 eng |
040			_aBR-BrBNA _beng
072			_aH60 _b0230
072			_aF03
100			_aCabrera, D.C.
100			_aSobrero, M.T.
100			_aPece, M.
100			_aChaila, S.
245			_aEffect of environmental factors on the germination of Megathyrsus maximus: an invasive weed in sugarcane in Argentina
500			_aPublicação on-line; 32 ref.; 1 table; 3 illus.; Summary (En)
520			_a ABSTRACT Background: Megathyrsus maximus (Jacq.) is a perennial weed that affects many crops. In Argentina, sugarcane is the most affected. Objective: Study effective techniques to break dormancy and the effect of environmental factors on the germination of this weed. Methods: Experiments were carried out in cabinet incubators twice, with five replicates per treatment. The experimental unit was made up for 50 seeds. Results: Seed dormancy was strongly associated with the presence of glumes. Manual extractions of glumes and immersion in sulphuric acid were the most effective techniques for breaking dormancy. Megathyrsus maximus did not depend on light to germinate, and it did so both under a 12 h-light-dark photoperiod and in complete darkness, with maximum mean germination percentages of 73 and 76%, respectively. Mean germination percentage (G) and coefficient of germination (CG: number of germinated seeds per day) showed that this weed responded to a wide range of temperatures, the optimal varied between 25 and 35 °C. Both mean germination percentages and CG decreased as osmotic potential became increasingly negative (0 MPa to -0.6 MPa), and as sodium chloride solution concentrations increased (10 to 130 mmol L-1). No germination was observed at -0.8 MPa and with a 150 mmol L-1 sodium chloride solution. Conclusions: The optimal germination conditions for M. maximus can be found in central sugarcane areas in Argentina, since soils are in ideal conditions and are kept under irrigation. In marginal areas, M. maximus germination would depend on rainfall and certain sodium chloride concentrations in the soil. Keywords: Megathyrsus maximus guinea grass scarification salt stress temperature osmotic stress dormancy
650			_aERVA DANINHA
650			_aESCARIFICAÇÃO DE SEMENTES
650			_aSALINIDADE
650			_aTEMPERATURA
650			_aDORMÊNCIA
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. 1-8; (2020) _wBR2023000827
856			_uhttps://www.scielo.br/j/pd/a/qFLcJjyMPCWsxjf5mFYY46r/?format=pdf&lang=en
942			_cAnalítica
999			_c9716 _d9716