Journal of Food, Agriculture and Environment

Ion adaptive mechanisms of Leymus chinensis to saline-alkali stress

Author(s):

Hongyuan Ma ^{1, 2}, Zhengwei Liang ^{1, 2*}, Haoyu Yang ^{1, 2}, Lihua Huang ^{1, 2}, Mingli Zhao ³

Recieved Date: 2011-07-11, Accepted Date: 2011-10-05

Abstract:

Leymus chinensis is a saline-alkali tolerant grass of the Eurasian Steppe of great economic, ecological and nutritional importance. Mechanisms of ions (K⁺, Na⁺, Ca2⁺) adaptation to saline-alkali stresses were investigated in shoot, root and rhizome of the L. chinensis growing in five degrees of salinealkali soils for 6 months. Results showed that with increasing soil saline-alkalinity, Na⁺ in the shoots and rhizomes significantly increased while no obvious changes were observed in roots; K⁺in the three organs significantly decreased initially and then did not significantly change; Ca²⁺ in the three organs did not significantly change. With increasing of soil saline-alkalinity, selective absorption of K⁺ over Na⁺ (SA _{K, Na}) in the three organs increased and was particularly higher in roots and rhizomes. SA_{Ca, Na} in these organs generally decreased but the selective transport ability of Ca²⁺ (ST_{Ca, Na}) increased. To conclude, low concentrations of Na⁺ in the roots, strong selective uptake of K⁺ and Ca²⁺ to maintain higher levels of K⁺/Na⁺ and Ca²⁺/Na⁺ ratios, and relatively high SA_{K, Na} and ST_{Ca, Na} were important adaptive mechanisms to saline-alkali stress in L. chinensis.

Keywords:

Leymus chinensis, saline-alkali soil, abiotic stress, ion transport, selective adsorption

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 3&4
Category: Environment
Pages: 688-692

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