[Show abstract][Hide abstract] ABSTRACT: The present investigation has been an attempt to evaluate antifungal and antioxidant potential of two ethnobotanically important liverworts viz, Plagiochasma appendiculatum and Pellia endivaefolia. The methanolic extract was tested against three fungal species viz. Alternaria alternata, Aspergillus flavus and Aspergillus niger. Plagiochasma sp. proved to be more effective against all tested fungus; especially, A. flavus. Similarly Pellia sp. inhibited A. alternata the most. The antioxidant system viz. antioxidants and antioxidant enzymes were also evaluated. The values were enough closer to those of higher plants. Guaiacol peroxidase and catalase activity of Plagiochasma sp. was found to be higher than that of Pellia sp. All other evaluated parameters like superoxide dismutase, ascorbic acid, proline, glutathione and total phenols were higher in Pellia sp. as compared to Plagiochasma sp. This is the first report regarding the antioxidant system of these two liverworts.
Proceedings of the National Academy of Sciences, India - Section B: Biological Sciences 06/2014;
[Show abstract][Hide abstract] ABSTRACT: The effects of NaCl (200 mM) and osmotic stress generated by polyethylene glycol (PEG) on PSII maximal quantum efficiency, photosynthetic CO2/H2O gas exchange at two CO2 concentrations, content of chlorophyll, proline, and malondialdehyde were investigated in shoots of C4 xerohalophyte Haloxylon aphyllum (Chenopodiaceae). The PEG treatment induced a low water osmotic potential (−0.4 MPa) and inhibited photosynthesis (by a factor of 2) and transpiration (by a factor of 4). The NaCl treatment, at equal osmoticity conditions, reduced transpiration (by a factor of 2) and stimulated photosynthesis (by a factor of 2.5). Only the PEG-treated plants showed osmotic stress effects, which were demonstrated by an increase in proline and malondialdehyde contents in the shoot tissue. The data indicated that the halophilic character of this species was essential for maintaining the plant water status and photosynthesis under osmoticity induced by NaCl treatment. Herewith, the presence of C4-type photosynthesis appeared to be just an auxiliary mechanism, because this xerohalophyte did not reveal the efficiency in water use typical for C4 plants under osmotic stress, in the absence of a saline substrate.
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