Physiological responses to NaCl stress in three wild species of potato in vitro

Abstract

In this study, responses of wild species of potato to NaCl stress were investigated in vitro. In S. stoloniferum and S. bulbosum, length of the shoot, fresh and dry weight, photosynthetic pigments, K ? concentration, K ? /Na ? ratio, ascorbate pool, anthocyanin, and phenolic and flavonoid compounds were decreased in response to salinity. In these species, salinity increased the level of Na ? , lipid peroxidation, proline and ion leakage percentage. In S. acaule, the length of the shoot, and fresh and dry weight were not affected by salinity. Photosynthetic pigments, Na ? concentration, proline, flavonoid and phenolic compounds quantities were increased and K ? /Na ? ratio were decreased. K ? concentration, lipid peroxidation, ascorbate pool, anthocyanin and ion leakage were not changed by NaCl stress. Superoxide dismutase, guaiacol peroxidase, ascorbate peroxidase and catalase activities were increased in all species. The results suggest that the non-enzymatic antioxidant capacity in S. acaule (salt tolerant) is more important than the enzymatic antioxidant capacity in comparison with the other species.

Influence of abiotic stresses on plant proteome and metabolome changes

“…However, high salinity induced a decrease in the anthocyanin level in the salt-sensitive species of potatoes, (Daneshmand et al 2010). Plant tissues with a higher content of anthocyanins usually have a higher resistance to drought.…”

Response of coleoptiles to water deficit: growth, turgor maintenance and osmotic adjustment in barley plants (Hordeum vulgare L.)

“…This leads to cells retaining water and a consequent tendency to retain their turgor pressure under water deficit. Osmotic adjustment reduces the sensitivity of processes dependent on turgor, such as growth and stomatal activity, when the water potential falls [19].…”

“…The existence of intraspecific variability with respect to osmotic adjustment [6,16,17,19,[20][21][22] and coleoptile growth [23,24] has been demonstrated in different crops. This, along with the possibility of identifying QTLs that control drought tolerance in seedling [25], and coleoptile growth [26], renders the study of coleoptile growth of great interest in the improvement of drought tolerance.…”

Anthocyanins participate in protection of wheat seedlings from osmotic stress

“…The accumulation of anthocyanins in response to stress has been reported to be genotype dependent. Daneshmand et al (2010) observed in wild po- tato species under salinity stress a decrease in anthocyanin content in salt sensitive species and no change in salt-tolerant ones. Ploenlap and Pattanagul (2015) observed anthocyanin overaccumulation under drought stress in a drought-tolerant rice and reduced anthocyanin content in a drought-sensitive variety.…”