Potassium and sodium relations in salinised barley tissues as a basis of differential salt tolerance

被引:235
作者
Chen, Zhonghua
Zhou, Meixue
Newman, Ian A.
Mendham, Neville J.
Zhang, Guoping
Shabala, Sergey
机构
[1] Univ Tasmania, Sch Agr Sci, Hobart, Tas 7001, Australia
[2] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia
[3] Univ Tasmania, TIAR, Kings Meadows, Tas 7249, Australia
[4] Zhejiang Univ, Dept Agron, Hangzhou 310029, Peoples R China
关键词
Hordeum vulgare; ion flux; leaf elemental content; potassium; salinity; screening; sodium;
D O I
10.1071/FP06237
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
A large-scale glasshouse trial, including nearly 70 barley cultivars (5300 plants in total), was conducted over 2 consecutive years to investigate plant physiological responses to salinity. In a parallel set of experiments, plant salt tolerance was assessed by non-invasive microelectrode measurements of net K+ flux from roots of 3-day-old seedlings of each cultivar after 1 h treatment in 80mM NaCl as described in our previous publication (Chen et al. 2005). K+ flux from the root in response to NaCl treatment was highly (P < 0.001) inversely correlated with relative grain yield, shoot biomass, plant height, net CO2 assimilation, survival rate and thousand-seed weight measured in glasshouse experiments after 4 - 5 months of salinity treatment. No significant correlation with relative germination rate or tillering was found. In general, 62 out of 69 cultivars followed an inverse relationship between K+ efflux and salt tolerance. In a few cultivars, however, high salt tolerance (measured as grain yield at harvest) was observed for plants showing only modest ability to retain K+ in the root cells. Tissue elemental analysis showed that these plants had a much better ability to prevent Na+ accumulation in plant leaves and, thus, to maintain a higher K+/Na+ ratio. Taken together, our results show that a plant's ability to maintain high K+/Na+ ratio (either retention of K+ or preventing Na+ from accumulating in leaves) is a key feature for salt tolerance in barley.
引用
收藏
页码:150 / 162
页数:13
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