Tavakkoli, Ehsan and Rengasamy, Pichu and McDonald, Glenn (2010) The response of barley to salinity stress differs between hydroponic and soil systems. Functional Plant Biology, 37 (7). pp. 621-633. ISSN 1445-4408
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Official URL: http://dx.doi.org/10.1071/FP09202
Identification Number or DOI: doi: 10.1071/FP09202
Many studies on salinity stress assume that responses in hydroponics mimic those in soil. However, interactions between the soil solution and the soil matrix can affect responses to salinity stress. This study compared responses to salinity in hydroponics and soil, using two varieties of barley (Hordeum vulgare L.). The responses to salinity caused by high concentrations of Na+ and Cl– were compared to assess any consistent differences between hydroponics and soil associated with a cation and an anion that contribute to salinity stress. Concentrated nutrient solutions were also used to assess the effects of osmotic stress. The effects of salinity differed between the hydroponic and soil systems. Differences between barley cultivars in growth, tissue moisture content and ionic composition were not apparent in hydroponics, whereas significant differences occurred in soil. Growth reductions were greater under hydroponics than in soil at similar electrical conductivity values, and the uptake of Na+ and Cl– was also greater. The relative importance of ion exclusion and osmotic stress varied. In soil, ion exclusion tended to be more important at low to moderate levels of stress (EC at field capacity up to 10 dSm–1) but osmotic stress became more important at higher stress levels. High external concentrations of Cl– had similar adverse effects as high concentrations of Na+, suggesting that Cl– toxicity may reduce growth. Fundamental differences in salinity responses appeared between soil and solution culture, and the importance of the different mechanisms of damage varies according to the severity and duration of the salt stress.
|Item Type:||Article (Commonwealth Reporting Category C)|
|Additional Information:||Permanent restricted access to published version due to publisher copyright restrictions.|
|Uncontrolled Keywords:||salt; sodium; adverse effect; chlorine ions; electrical conductivity; field capacity; growth reduction; Hordeum vulgare; ion exclusion; ionic composition; moisture contents; nutrient solution; osmotic stress; salinity stress; salt stress; soil matrices; soil solutions; soil systems; solution cultures; stress levels|
|Fields of Research (FOR2008):||05 Environmental Sciences > 0503 Soil Sciences > 050304 Soil Chemistry (excl. Carbon Sequestration Science)|
07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070303 Crop and Pasture Biochemistry and Physiology
10 Technology > 1001 Agricultural Biotechnology > 100101 Agricultural Biotechnology Diagnostics (incl. Biosensors)
|Socio-Economic Objective (SEO2008):||B Ecomonic Development > 82 Plant Production and Plant Primary Products > 8205 Winter Grains and Oilseeds > 820501 Barley|
|Deposited On:||24 Mar 2011 20:47|
|Last Modified:||10 Feb 2012 13:41|
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