Resumo

FRANCISCO-FRANCISCO, Nazario  e  BENAVIDES-MENDOZA, Adalberto. Impact of diurnal temperature and salinity on chlorophyll fluorescence in Strawberry. Rev. Mex. Cienc. Agríc [online]. 2014, vol.5, n.1, pp.157-162. ISSN 2007-0934.

This study was conducted to investigate the behavior of the chlorophyll fluorescence of plants of strawberry (Fragaria x ananassa) with the daytime temperature salinity and low emissions. For this, strawberry plants were established in pots of black polyethylene with a capacity of 5 L containing peat moss as substrate. Salinity treatments were induced by the application of CaCl₂ at 0 and 12 mM, which was added to a nutrient solution Steiner. The control and the treated plants grown in a greenhouse ventilated with exhaust fans and were irrigated every two days. The investigation of the impact of diurnal temperature on chlorophyll fluorescence recording was made greenhouse temperature every hour between 8:00 am to 5:00 pm. Measurements of the fluorescence parameters were performed on days 0, 14, 28, and 42 after initiation of salinity treatments. Treatment of 12 mM ofCaCl₂ reduced the maximum quantum efficiency (Fv / Fm) and effective (EPS2) but did not increase the decay non-photochemical (NPQ) is interpreted as a response to the PSII minimal involvement. As to the temperature decrease in the plants showed the Fv/Fm and EPS2 air temperatures exceeding 28 °C. The maximum photochemical efficiency was observed with temperatures below 19 °C.

Palavras-chave : photochemical efficiency; photoinhibition; photoprotection.

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