Abstract

RODRIGUEZ TORRESSI, A. O et al. Eficiencia fotoquímica máxima e índice de potencial fotosintético en plantas de melón (cucumis melo) tratadas con bajas temperaturas. FAVE. Secc. Cienc. agrar. [online]. 2014, vol.13, n.2. ISSN 1666-7719.

SUMMARY Maximum efficiency phothochemistry and potential photosynthetic index in melon plants (Cucumis melo) treated with low temperatures Measurements of the chlorophyll fluorescence is used to examine the photochemical efficiency of plants a wide range of environmental conditions. The quantum yield of non-cyclic electron transport is directly proportional to the efficiency of excitation of the reaction centers of Photosystem II (PS II) and can be determined by indexes such as Fv / Fm and PI abs. The aim of this study was to determine the maximum photochemical efficiency of PSII and photosynthetic potential in plants treated with low temperatures. The experiment was conducted at the Estación Experimental Agropecuaria (EEA) INTA y la Facultad de Agronomía y Agroindustria de la Universidad Nacional de Santiago del Estero (UNSE). Treatments consisted of melon plants (cv. Sweet Ball) without (control) and with low night temperatures between 10°C and 0ºC to -3ºC  to 0°C. Photochemical efficiency (Fv / Fm), photosynthetic potential index (PI abs) and in turn MDA concentration increased.

Keywords : Cucumis melo sp.; Flourescence; Malondialdehyde; MDA.

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