Chlorophyll a fluorescence of sweet potato plants cultivated in vitro and during ex vitro acclimatization

Ano: 2010 | Volume: 22 | Número: 3

Autores: Francine F. Cassana, Antelmo R. Falqueto, Eugenia J. B. Braga, Jose A. Peters, Marcos A. Bacarin

Palavras-chave: culture medium, photon flux density, photosystem, sucrose

Resumo Inglês:

Sweet potato (Ipomoea batatas L.) plants were cultivated in vitro in Murashige and Skoog (MS) medium with 20 and 40 g L-1 of
sucrose under two different photon flux densities (21 and 60 μmol m-2 s-1). Leaves developed in vitro mostly showed high variable
to maximum fluorescence ratio (FV/FM) , indicating good development of photosynthetic apparatus. This ratio decreased during
leaf aging, especially in the plants cultivated in vitro on medium with higher sucrose concentration and higher photon flux. Leaves
developed ex vitro showed high FV/FM ratio during whole experiment. The effective photochemical efficiency (FV’/FM’) was maximum
at 15th day after emergence of leaves. Photosynthetic potential rate was higher in leaves developed in vitro than in leaves originated
ex vitro.