Effects of salinity on the contents of polyamines and some other compounds in sunflower plants differing in salt tolerance

Abstract

The effects of salt stress (50, 100, and 150 mM NaCl) on the levels of free, bound, and total polyamines were studied in the leaf tissues of salt-tolerant (Coban) and salt-sensitive (Sanbro) cultivars of sunflower ( Helianthus annuus L.) plants grown for 15 or 25 days under salinity. The amounts of free, acid-soluble bound, and total spermine increased in leaf tissues of sunflower plants subjected to salt stress while the levels of other polyamines decreased or no significant changes occurred. The increase in some PA titers suggests their potential role in overcoming the adverse effect of salinity stress. The salt sensitivity of the sunflower plants was associated with the excessive accumulation of total polyamines in the leaf tissues of salt-sensitive cultivar (Sanbro) under saline condition. The content of other compounds such as proline, protein, and ions (Na + , K + , Cl -, K + /Na + ) in leaf tissue changed depending on salt concentration and the cultivars used.

In vitro selection of salt tolerant variants following 60Co gamma irradiation of long-term callus cultures of Zoysia matrella [L.] Merr.

“…The accumulation of proline is widely used as a selection parameter for salinity and drought tolerance (Cui et al 2010). Less proline accumulates in salt tolerant cultivars than in sensitive cultivars under salt stress in crops such as sunflower (Mutlu and Bozcuk 2005); rice (Lutts et al 1996;Vaidyanathan et al 2003); wheat (Colmer et al 1995) and turfgrasses (Marcum 1999;Qian et al 2001). In this study, no significant difference was found in proline content between any two different plant lines under control conditions, but salt-tolerant lines accumulated significantly less proline than CK under salt stress.…”

Amelioration of salinity stress by exogenously applied spermidine or spermine in three varieties of indica rice differing in their level of salt tolerance

“…The increase in PA levels may be an integral self-protecting adaptive response to salinity and drought due to their roles in OA, membrane stability, free-radical scavenging and regulation of stomatal movements (Sanchez et al, 2005;Liu et al, 2008). The endogenous Spd and Spm increase in water-stressed tissues or plants subjected to NaCl, particularly in salt/drought-tolerant species, were reported earlier (Nayyar and Chander, 2004;Mutlu and Bozcuk, 2005), being associated with a decrease in Put content, while the opposite trend, i.e., increase of Put reported in many salt-sensitive varieties (Liu et al, 2004). The Put has lower or even no positive effects in stress alleviation (Mansour and Al-Mutawa, 1999).…”

Overexpression of suadea salsa S-adenosylmethionine synthetase gene promotes salt tolerance in transgenic tobacco

“…Plants respond to the salt-stressed environmental condition accumulating low molecular weight osmolytes such as PAs (Flores 1991). Salinity caused a significant increase in Spd and Spm in almost all the plant species studied (Zapata et al 2004;Mutlu and Bozcuk 2005). Moreover, Mansour and Al-Mutawa (1999) indicated that the cellular alterations induced by NaCl in wheat roots were alleviated by low concentrations of Spd or Spm and El-Shintinawy (2000) also indicated that salinity greatly enhanced the accumulation of Spm and Spd in wheat cultivars.…”