Journal
RUSSIAN JOURNAL OF PLANT PHYSIOLOGY
Volume 53, Issue 5, Pages 649-655Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1021443706050086
Keywords
Brassica napus; salt tolerance; osmotic potential; accumulation of inorganic ions; proline; proline dehydrogenase
Categories
Ask authors/readers for more resources
Physiological mechanisms of two rape (Brassica napus L.) genotype adaptation to chlorine salinity were investigated. The plants of two cultivars (Olga and Westar) differing in salt tolerance were grown in the pots filled with Perlite on the Hoagland and Snyder's medium under controlled conditions. At a stage of 3-4 true leaves, the plants experienced 7-day-long salinity induced by a single addition of NaCl to the nutrient medium in order to attain desired final salt concentration (from 50 to 400 mM). The obtained results showed that a greater salt tolerance of cv. Olga plants (as compared with cv. Westar) could be accounted for by a capability of their root cells to uptake water under high salinity (300-400 mM NaCl, which is evident from a greater content of water in the tissues of cv. Olga. This was ensured by a sharp fall of the osmotic potential of the cellular contents (down to -2.3 MPa) at a low water potential of nutrient solution owing to more active uptake of Ne (57-61 mu eq/g fr wt) and K+ (210-270 mu eq/g fr wt) as well as active accumulation of proline (30-50 mu mol/g fr wt). The latter is caused by a reduced activity of proline dehydrogenase and retarded degradation of this osmolyte. It is important that, in contrast to less tolerant genotype, the rape plants of salt-resistant cultivar were able to maintain the K+/Na+ ratio at a rather high level at salinity of different degree, which made it possible to preserve ionic homeostasis under adverse conditions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available