Abstract
We evaluated leaf fragments of three castor bean cultivars after being subjected to water stress. Leaf discs were exposed to polyethylene glycol (PEG-6000) solutions for tissue dehydration at various water potentials. After water-stress imposition, electrolyte leakage and chlorophyll a fluorescence were used jointly on the same leaf fragments cut from the same plant leaf. Furthermore, these two experimental procedures were adapted to unequivocally distinguish cultivars’ responses to water stress. Electrolyte leakage, ion efflux, membrane injury index and maximum quantum yield of photosystem II showed genotypic differences between cultivars. Despite these genotypic differences, the photosystem II electron transport rate was not significantly affected by water stress. The membrane injury shown may have been transient, probably due to a disarrangement in the phospholipid bilayer. The use of the two experimental procedures on the same leaf samples was less time-consuming and allowed for more reliable results. Furthermore, the procedures proved efficient for selection of physiological water-stress tolerance traits and could be employed in other plant experimental models.
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Acknowledgments
The authors are grateful to EMBRAPA-Algodão and the Instituto Agronômico de Campinas for kindly supplying castor bean seeds and to J.S. Garcia, C.K.R. Barbosa, A.C. Souza and M.S. Silva for assistance with plant cultivation and the experiments. We also thank Alistair Hayward for the translation and review of the English version of the text. This work was supported by FAPEMIG.
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Communicated by U. Feller.
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Fig. S1. Apparatus used to adapt castor bean leaf fragments to light. This apparatus was designed with the aim of adapting samples subjected to PEG-6000 to light. It consists of 12 dichroic lamps (20 W 12 V - B) powered by electronic reactors (A). Each lamp provides an easily distinguishable spotlight (D). The light intensity of these lamps can be adjusted by using a dimmer (E) and through altering the distance between the light source and the samples. The apparatus is equipped with a glass box (C) containing an adequate layer of water to prevent samples from overheating, as well as allowing for alterations in photons flow.
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de Faria, A.P., Lemos-Filho, J.P., Modolo, L.V. et al. Electrolyte leakage and chlorophyll a fluorescence among castor bean cultivars under induced water deficit. Acta Physiol Plant 35, 119–128 (2013). https://doi.org/10.1007/s11738-012-1054-3
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DOI: https://doi.org/10.1007/s11738-012-1054-3