Abstract
Salinity constitutes an important abiotic problem since ancient times, worldwide, for it leads to a decrease in productivity of crops with agronomic value. Under salt stress conditions, plant cells develop strategies to cope with Na + and Cl - , including exclusion and compartmentalisation, induction of antioxidant enzymatic systems and compatible solutes accumulation, such as proline. The precise function of this osmolyte still remains unclear. Proline may act on osmotic adjustment, as a free radical scavenger, protecting enzymes and avoiding DNA damages. It has been also suggested the role of proline in prevention of lipid peroxidation and as a signalling/regulatory molecule. A salt-sensitive Citrus sinensis ‘Valencia late’ cell line has a smaller growth rate and accumulates proline in the presence of NaCl (>200 mM). The addition of external proline to this cell line was evaluated in terms of cell metabolism. A positive influence on the relieve of salt stress symptoms due to the presence of exogenous proline 5 mM and 100 mM NaCl was obtained, with increased growth of this salt sensitive citrus cell line.
Highlights
Since ancient times salinity is a serious problem, that limits world plant production and decreases the crop productivity of plants with agronomic value (Flowers, 2004; Mansour and Salama, 2004)
Ferreira (2005) showed that Citrus sinensis ‘Valencia late’ is sensitive to salt stress and demonstrated that, in the presence of NaCl, the growth rate decreased and proline accumulated in cells
In the present work we investigated the effect of exogenous proline addition on a Citrus sinensis ‘Valencia late’ cell line grown with or without NaCl
Summary
Since ancient times salinity is a serious problem, that limits world plant production and decreases the crop productivity of plants with agronomic value (Flowers, 2004; Mansour and Salama, 2004). Under salt stress conditions plant cells have different strategies to survive such as Na+ and Cl- exclusion/compartmentalizing (Flowers et al, 1977; Walker and Douglas, 1983; Binzel et al, 1987), activation of antioxidant enzymatic systems (Dat et al, 2000; Blokhina et al, 2003; Saíram and Tyagi, 2004) and accumulation of compatible solutes as proline (Petrusa and Winicov, 1997; Ehsanpour and Fatahian, 2003; Khedr et al, 2003). In the present work we investigated the effect of exogenous proline addition on a Citrus sinensis ‘Valencia late’ cell line grown with or without NaCl
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