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Different Effect of Humidity on Growth and Salt Tolerance of Two Soybean Cultivars
Authors:P. An   S. Inanaga   U. Kafkafi   A. Lux  Y. Sugimoto
Affiliation:(1) Plant Eco-physiology Laboratory, Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori, 680-0001, Japan;(2) Department of Field and Vegetable Crops, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, 76-100, Israel;(3) Department of Plant Physiology, Faculty of Natural Sciences, Comenius University, Mlynská dolina B-2, 84215 Bratislava, Slovakia
Abstract:Two soybean (Glycine max (L.) Merr.) cultivars, Tachiyutaka and Dare, were grown in pots at 30 and 70 % relative humidity (RH) and treated with 0 (control), 40 (moderate), 80 and 120 (severe) mM NaCl for 3 weeks. Increasing RH enhanced growth of salt sensitive cultivar, Tachiyutaka, but had no effect on salt tolerant cultivar, Dare, under control and moderate saline conditions. Both cultivars benefited from elevated humidity under severe saline conditions. Cultivar Tachiyutaka had poorer ability for controlling translocation of Na+ to the leaves, lower Na+ exclusion ability in the roots, and lower root activity under NaCl treatment, compared with cv. Dare. The increased growth of cv. Tachiyutaka at high RH was consistent with decreased Na+ accumulation in the leaves, increased stomatal conductance and root activity, while the unchanged growth of cv. Dare was consistent with similar Na+ accumulation in the leaves, and the decreased root activity.
Keywords:Glycine max  Na+ content  root exudate  stomatal conductance  transpiration
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