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Salinity induced changes in cell membrane stability, protein and RNA contents.

AFRICAN JOURNAL OF BIOTECHNOLOGY (Impact Factor: 0.57). 01/2012;
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    ABSTRACT: The study was aimed to document the medicinal plants and their traditional uses in the Omara, Gawadar, Pakistan during 2008-2010. The ecosystem of Makran coast is rich in important medicinal plant wealth. These plants are not only used as herbal drugs but also a source of food, fodder and spices. The climate of Omara is dry, hot arid. Data were collected through direct observations during comprehensively field surveys, questionnaires and interviews of local inhabitants and herbal practitioners.A total of 31 potential medicinal plants belonging to 21 families were identified, traditionally used for remedial measures against special diseases. The inventory of medicinal plants shows family Chenopodiacae dominating other plant families. Out of total documented species in this area 45% were in the use of local communities as medicine in one or other form. Among the rest, 26% plants have multiple uses and the remaining are utilized as fodder (29%). Indigenous people use various parts of the plant for curing different ailments. As no specific ethno-botanical data are available for such plants in this area, the present work was taken up for the documentation and analysis of traditional knowledge of medicinal plants used by coastal communities. It also determines the homogeneity of information collected on medicinal plants apt for the treatment of different ailments in the study area.
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    ABSTRACT: The inherent differences for salt tolerance in two maize cultivars (Agatti-2002 and Sahiwal-2002) were evaluated in pot experiments. Plants were grown in half-strength of Hoagland nutrient solution added with 0, 80, 100, 120, 140 and 160mM of NaCl. Salt stress markedly reduced the shoot and root lengths and fresh and dry masses. Reduction in growth attributes was more pronounced in cv. Agatti-2002 than cv. Sahiwal-2002. Both maize cultivars exhibited significant perturbations in important biochemical attributes being employed for screening the crops for salt tolerance. Cultivar Sahiwal-2002 was found salt tolerant as compared to cv. Agatti-2002 because it exhibited lower levels of H2O2, malondialdehyde (MDA) and higher activities of antioxidant enzymes. In addition, cultivar Sahiwal-2002 exhibited less salt-induced degradation of photosynthetic pigments, lower levels of toxic Na and Cl2 and higher endogenous levels of K and K/Na ratio. The results indicate that salt stress induced a marked increase in MDA, H2O2, relative membrane permeability, total soluble proteins and activities of antioxidant enzymes (superoxide dismutase, peroxidase, catalase andascorbate peroxidase). Moreover, increase in endogenous levels of Na and Cl2 and decrease in K and K/Na ratio and photosynthetic pigments were recorded in plants grown under salinity regimes.

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