biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 45:409-415, 2002 | DOI: 10.1023/A:1016273818726

Effects of Salinity and Relative Humidity on Two Melon Cultivars Differing in Salt Tolerance

P. An, S. Inanaga, A. Lux, X.J. Li, M.E.K. Ali, T. Matsui, Y. Sugimoto

The effects of increasing relative humidity on the growth and salt tolerance of two melon (Cucumis melo L.) cultivars, Revigal C-8 (salt sensitive) and Galia (salt tolerant) was investigated. One month after germination, the plants were exposed for 15 d to 0 (control) and 80 mM NaCl, under relative humidity (RH), 30 and 70 %. The growth of the whole plant, leaf, stem and root of cv. Revigal C-8 was increased with increasing RH. On the other hand, cv. Galia showed an increase in root growth with increasing RH only under the NaCl treatment. Under salinity, most of the Na+ was withheld in the stems. An increase in RH in the NaCl treatment significantly decreased Na+ and Cl- concentrations in leaves of cv. Revigal C-8, while it had no effect on their concentrations in cv. Galia. In both cultivars, increasing RH under NaCl condition significantly decreased water contents in leaves and stems, and increased osmotic potential in roots. The amount of the root exudate of cv. Galia was significantly decreased with increasing RH, while it was not affected in cv. Revigal C-8. Under the NaCl treatment, cv. Galia had significantly higher leaf osmotic potential than cv. Revigal C-8 at both relative humidities and higher amount of root exudate at 30 % RH.

Keywords: Cucumis melo L.; Na+; osmotic adjustment; root hydraulic conductivity; stem
Subjects: Cucumis melo; cultivar differences; hydraulic conductance; osmotic adjustment; relative humidity, melon cultivars, salt tolerance; root hydraulic conductivity; salt stress, cultivar differences, melon; salt stress, tolerance, melon cultivars

Published: September 1, 2002  Show citation

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An, P., Inanaga, S., Lux, A., Li, X.J., Ali, M.E.K., Matsui, T., & Sugimoto, Y. (2002). Effects of Salinity and Relative Humidity on Two Melon Cultivars Differing in Salt Tolerance. Biologia plantarum, 45(3), 409-415. doi: 10.1023/A:1016273818726
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