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vol. 8, nr. 1 (2006)
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hanges in micropore system of barley roots under
Al-stress
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Alicja Szatanik-Kloc
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Institute of Agrophysics, Polish Academy of Sciences, ul. Doświadczalna 4, 20-290 Lublin |
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vol. 8 (2006), nr. 1,
pp. 239-249
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abstract:
Spring barley (Ars) roots were studied. The plants were grown in hydroponic cultures, at pH = 7, pH = 4 (without Al ions), and at pH = 4 with the addition of 5, 10, 20 mg dm-3 of aluminium ions. The plants were stressed with different AlCl3 concentration levels at shooting stage. The micropore size distribution functions, average radius and total volume of micropores (1-50 nm) of the plants roots were determined from water vapour and nitrogen desorption data. The micropore characteristics of the roots at pH =4 without Al ions addition were apparently the same as those of the control roots (pH = 7). Under Al treatment the number of large pores of radius of 10-50 nm increased, indicating a possible maceration of root tissue (intercellular space increase to dissolution of the central blade). The average micropore radius and total volume micropores increased, as well.
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keywords:
roots, pH, aluminium, nitrogen and water vapour desorption isotherms, distribution function of micropores, pore volume and pore radius
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original in:
Polish
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