The activity of NADP-malic enzyme, NADP-malate dehydrogenase and phosphoenolpyruvate carboxylase showed a trend that first increased and then decreased. Lastly, we found that Rubisco activity was inhibited under salt stress. Two organic acids (malate and citrate) involved in tricarboxylic acid (TCA)-cycle exhibited increasing contents under salt stress.
Beet seedlings moore ok free#
Moreover, osmoprotectants such as free amino acids and betaine increased in concentration as the external salinity increased. The activities of antioxidant enzymes such as superoxide dismutase, catalase, ascorbate peroxidase and glutathione peroxidase showed increasing patterns with increase in salt concentrations. P content showed an increasing pattern in these tissues. N and K contents in the tissue of leave, petiole and root decreased rapidly with the increase of NaCl concentrations. As salt concentrations increased, degree of growth arrest became obvious In addition, under salt stress, the highest concentrations of Na + and Cl − were detected in the tissue of petioles and old leaves. We found no differences in dry weight of the aerial part and leaf area between 70 mM NaCl and control conditions, although dry weight of the root and whole plant treated with 70 mM NaCl was lower than control seedlings.
To investigate the response to different levels of salt stress, sugar beet was grown hydroponically under 3 (control), 70, 140, 210 and 280 mM NaCl conditions.
Sugar beet, one of the world’s leading sugar crops, has stronger salt tolerant characteristics than other crops. Salinity stress is a major limitation to global crop production.
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