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KMID : 0903619990400040425
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Journal of the Korean Society for Horticultural Science
1999 Volume.40 No. 4 p.425 ~ p.430
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Partitioning of Na+, K+, Proline , and Total Soluble Sugar in Relation to the Salinity Tolerance of Brasska juncea and Brussica rapa
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권택륜/Kwon, Taek Ryoum
필 하리스/윌리엄 본/Harris, P. J. C./Bourne, W. F.
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Abstract
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Brassica juncea (L.) Czernjaew, ´Common Green´ (salt-tolerant) and B. raga L., ´Sani´ (salt-sensitive) were grown in a greenhouse with or without 125 O₂·m^(-3) NaCl. Distribution of biomass, Na^+, K^+, proline, total soluble sugar, and water content within a plant was measured in relation to salinity tolerance. The NaCl-treated plants preferentially accumulated K^+, proline, and total soluble sugar in expanding leaves and Na$quot; in expanded leaves. The results suggest that the salt-induced growth inhibition in both species may be caused by a water deficit effect of salinity in expanding leaves and by excess Na^+ accumulation and/or K^+ deficiency in fully expanded mature leaves. The two species differed in their ion accumulation pattern but not in water content, proline, and total soluble sugar accumulation in response to salinity, indicating that the relative salinity tolerance was related to an ion effect rather than a water deficit effect. It is concluded that the relative salinity tolerance of the two Brassica species was associated with the ability of Na^+ exclusion, the selective uptake of K^+ over Na^+ and the maintenance of higher K^+/Na^+ ratio and K^+ but lower Na^+ in growing leaves and stems.
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