Responses of growth and antioxidant systems in Carthamus tinctorius L. under water deficit stress

Abstract

An investigation was carried out to find out the extent of changes occurred in two safflower (Carthamus tinctorius L.) cultivars in response to water deficit stress. Two safflower cultivars namely IL.111 and Isfahan were used for the study. Thirty days after sowing, plants were grown under soil moisture corresponding to 100, 85, 70 and 55% field capacity for next 30 days. Water deficit treatments significantly decreased the shoot length, shoot dry matter, root dry matter, relative growth rate, leaf relative water content (LRWC) and leaf water potential (W W ), whereas root length, root-to-shoot ratio, lipid peroxidation and antioxidant compounds such as ascorbic acid (AA), a-tocopherol (a-Toc) and reduced glutathione (GSH) and superoxide dismutase (SOD, EC 1.15.

Response of growth and antioxidant enzymes to osmotic stress in two different wheat (Triticum aestivum L.) cultivars seedlings

“…In drought-tolerant plant species, POD activity was found to be sufficiently high to enable the plants to protect themselves against oxidative stress (Fazeli et al 2007, Vaseva et al 2012). Activity of one or more antioxidant enzymes generally increases in plants exposed to drought conditions, and this elevated activity correlates with increased drought tolerance (Srivalli et al 2003, Hojati et al 2011, Hassanpour et al 2012. Findings from the present study showed that POD activity in the tolerant cultivar HST was higher than those in the sensitive one LC15 (Figure 2c).…”

“…Findings from the present study showed that POD activity in the tolerant cultivar HST was higher than those in the sensitive one LC15 (Figure 2c). A number of studies indicated that POD activity response to osmotic stress vary among plant species and among different cultivars (Hojati et al 2011). It is concluded that the higher activity of POD in the tolerant cultivar HST might be better to protect proteins, chlorophyll and lipids of some parts of plants against ROS attack compared to that in the sensitive LC15.…”

“…It was accepted that SODs are localized in chloroplasts, mitochondria, peroxisomes and the cytosol; POD activities are distributed in vacuoles, the cell walls and the cytosol, whereas CAT enzymes are presented only in peroxisomes (Vaseva et al 2012). The drought-induced changes in activities of SOD, POD and CAT were detected in a large number of plant species, such as Oryza sativa (Srivalli et al 2003), Sesamum indicum (Fazeli et al 2007), Carthamus tinctorius (Hojati et al 2011), Mentha pulegium (Hassanpour et al 2012), and Trifolium pratense (Vaseva et al 2012). These findings suggest that the induction of ROS-scavenging enzymes, such as SOD, POD and CAT, is the most common mechanism of drought tolerance for detoxifying ROS synthesized.…”

Antioxidant and carbohydrate changes of two pomegranate cultivars under deficit irrigation stress

“…Increase in CAT activity has also been reported in other plants (Anjum et al, 2011;Huseynova, 2012). Hojati et al, 2011). During water stress, especially in 25% FC, both pomegranate cultivars ('Rabbab' and 'Shishehgap') showed high activity of SOD, APX and CAT enzymes.…”

Differential Responses of Two Rice Varieties to Perchlorate Stress

“…The current results also showed perchlorate addition significantly increased POD activity at tillering stage, but there was no significant difference at heading stage. A number of studies indicated that POD activity response to environmental stress vary among plant species and among different cultivars [36,37].…”