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2013 | 35 | 01 |
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Exogenous progesterone application protects chickpea seedlings against chilling-induced oxidative stress

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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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  • Department of Biology, Science Faculty, Ataturk University, 25240 Erzurum, Turkey
  • Department of Biology, Science Faculty, Ataturk University, 25240 Erzurum, Turkey
  • Department of Biology, Science Faculty, Ataturk University, 25240 Erzurum, Turkey
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