Authors:S. D’souza, N. Nathawat, J. Nair, P. Radha Krishna, N. Ramaswamy, G. Singh, and M. Sahu
Nathawat, N. S., Nair, J. S., Kumawat, S. M., Yadava, N. S., Singh, G., Ramaswamy, N. K., Sahu, M. P., D’souza, S. F. (2007): Effect of seed soaking with thiols on the antioxidantenzymes and photosystem activities in wheat subjected to water stress
S-methylmethionine (SMM) is an important intermediary compound in the sulphur metabolism and has been shown to play a possible role in moderating the damaging effects of low temperature stress. The present work investigated the extent to which SMM is capable of influencing the activity of antioxidant enzymes when the subtropical species maize is exposed to chilling temperatures during the early developmental phase. SMM was found to contribute to the protection of maize seedlings against low (<14°C) temperature stress by enhancing the activity of certain antioxidant enzymes to varying extents, and thus helping to neutralise the reactive oxygen species (ROS) formed at this temperature. Results obtained in a gradient plant growth chamber revealed that, with the exception of catalase, SMM increased the activity of all the antioxidants studied (glutathione reductase, glutathione-S-transferase, guaiacol peroxidase, ascorbate peroxidase), particularly in the lower ranges of the temperature gradient (6–14°C).
Authors:E. Kirova, D. Nedeva, A. Nikolova, and G. Ignatov
The effect of two sources of nitrogen (nitrogen fixation or nitrate assimilation) and gradual water stress on theelectrophoretic spectra of peroxidase, catalase and superoxide dismutase was studied in soybean leaves. An increase in H2O2 production was observed, especially after the prolonged drought treatment. At 50% drought the activity of anionic peroxidase activity for isoenzymes Nos. 2 and 7+8 significantly increased (by 54 and 18%, respectively) in the leaves of nitrate-fed plants compared to the control plants; for nitrogen-fixing plants these values were 31 and 14%, respectively. In the case of cationic peroxidases, the application of 50% drought led to the inhibition of the moderately fast isoenzymes (Nos. 2 and 3, with Rm 0.5 and 0.65, respectively) and the activation of the fastest moving isoenzyme (No. 4, with Rm 0.8) in nitrate-fed soybean. The same tendency was observed in the leaves of nitrogen-fixing plants. The effect of restricted soil humidity on SOD activity was expressed as a change in the activity of some of the isoenzymes. There was a clear tendency for the SOD isoenzyme activity to increase after the exposure of nitrate-fed and nitrogen-fixing soybean plants to 50% drought treatment. high catalase activity was registered in control nitrate-fed plants. Generally the catalase isoenzyme activity in control nitrogen-fixing plants had low values. Both intensities of water stress (30 and 50% drought) caused an increase in the catalase activity, and this increase was much higher for nitrogen-fixing plants. Therefore, soybean plants responded to drought treatment by changes in the antioxidant enzyme activity, as these changes were partially dependent on the source of nitrogen. The results suggested that nitrogen-fixing soybean plants were more resistant to gradual water stress.
Marzatico F., Pansara, O., Bertorelli, L., Somenzini, L., Della Valle, G.: Blood free radical antioxidantenzymes and lipid peroxides following long-distance and lactacidemic performances in highly trained aerobic and sprint athletes. J. Sports Med. Phys
Authors:M. F. Akhtar, A. Parveen, A. Hussain, M. Z. Mumtaz, M. Kamran, M. A. Farooqi, and M. Ahmad
. , Balasubramanya , S. and Anuradha , M. ( 2014 ): Assessment of genetic fidelity, antioxidantenzyme activity and proline content of micropropagated and field grown plants of Leptadenia reticulata (Wight & Arn.) – an endangered medicinal plant . – Plant Cell