Impact of osmotic stress and temperature on pigments and proteins of Anabaenastrains

Sharma, Ruchi; Chahar, O. P.; Bhatnagar, Monica; Bhatnagar, Ashish
September 2013
Journal of Environmental Biology;Sep2013, Vol. 34 Issue 5, p941
Academic Journal
A study on Anabaena strains was carried out to investigate the effect of combined stress of polyethylene glycol 6000 (0,-5 bar and -7 bar) and temperature (30°C and 45 °C) on photosynthetic pigments (chlorophyll a, carotenoids, phycobilins) and total proteins as stress metabolites. The selected strains, A. oryzae and A. ellipsospora were sensitive to osmotic stress at ambient temperature of 30 0C and increase in the temperature to 45 0C was harmful to the growth of Anabaena strains. Chlorophyll a contents decreased at 30 0C and -7 bar pressure from 8.868 to 0.710 µg ml-1 and 4.360 to 0.220 µg ml-1 in A. oryzae and in A. ellipsospora, respectively and at -7 bar osmotic stress and 45 0C temperature, decrease in Chl a content of A.oryzae was 92.9%, however A. ellipsospora was highly sensitive and could not survive under these conditions. Carotenoids and phycobilins also showed decreasing trends with increase in temperature and osmotic potential. Moreover, combined stress adversely depleted the cellular activities leading to a marked decrease in total protein contents of the cell. A.oryzae and A.ellipsospora showed varying tolerance potential to osmotic and temperature stresses. The results indicated that A. ellipsospora was more sensitive towards these stresses in comparison to A.oryzae.


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