Sodium and proline accumulation as osmoregulators in tolerance of sugar beet genotypes to salinity.
Twenty eight sugar beet genotypes were analysed for their tolerance at 3 NaCl levels (0, 3000 and 6000 mg NaCl kg(-1) soil) and Na+, K+, Na+/K+ and free proline were measured from the leaf samples. Results showed that increasing salinity level caused an increase in Na+, Na+/K+ and proline, but a decrease in K+ content of leaf samples (p < or = 0.01). As compared to non-tolerant genotypes, tolerant ones accumulated more Na+ and Na+/K+ and proline and less K+. It seems that Na+ and proline accumulation in shoots are effective mechanisms for osmotic pressure adjustment and plant tolerance to salinity, a mechanism commonly seen in sugar beet ancestors.
Pakniyat
H
H
Department of Crop Production and Plant Breeding, College of Agriculture, Shiraz University, Shiraz, Iran.
Armion
M
M
D000383:Agriculture / Q000379:methods; D027461:Beta vulgaris / Q000235:genetics*; D005838:Genotype; D007492:Iran; D009995:Osmosis; D011188:Potassium / Q000737:chemistry; D011312:Pressure; D011392:Proline / Q000737:chemistry*; D054712:Salinity; D012492:Salts / Q000494:pharmacology; D012964:Sodium / Q000737:chemistry / Q000378:metabolism*; D012987:Soil; D014867:Water / Q000737:chemistry; D014882:Water-Electrolyte Balance
D012492:Salts; D012987:Soil; D014867:Water; D011392:Proline; D012964:Sodium; D011188:Potassium