Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Decrease in variable charge and acidity of root surface under Al treatment are correlated with Al tolerance of cereal plants

Grzegorz Jozefaciuk and Alicja Szatanik-Kloc
Plant and Soil
Vol. 260, No. 1/2 (2004), pp. 137-145
Published by: Springer
Stable URL: http://www.jstor.org/stable/24129016
Page Count: 9
  • More info
  • Cite this Item
Decrease in variable charge and acidity of root surface under Al treatment are correlated with Al tolerance of cereal plants
Preview not available

Abstract

Shooting stage roots of cereal plants varying in Al tolerance: rye (Secale L.), triticale (Triticale), barley (Hordeum L.) and four wheat (Triticum L.) varieties grown at pH 7 (controls) and stressed during 10 days at pH 4 with aluminium concentrations ranging from 0 to 40 mg dm-3 were back titrated with NaOH. Back-titration data were used for estimation of variable surface charge vs. pH dependencies and apparent surface dissociation constants distribution functions. Roots grown at pH 4 without Al addition had apparently the same charge properties as the control roots. With the increase of the concentration of the aluminium treatment, the variable surface charge of the roots decreased, beginning at 5 mg Al dm-3 for barley, at 10 mg Al dm-3 for wheat and triticale (20 mg Al dm-3 for acid resistant wheat lnia), and at 40 mg Al dm-3 for rye, and a weakening of root surface acidity was deduced from the decrease in average surface dissociation constant of the root surface. The latter was connected with an increase of the relative number of weakly acidic surface sites and a simultaneous decrease in surface groups of medium and strong acidity. During Al stress the density of variable surface charge of the roots decreased markedly. Changes in surface charge properties of Al-tolerant species were less intensive than for Al-sensitive ones.

Page Thumbnails

  • Thumbnail: Page 
137
    137
  • Thumbnail: Page 
138
    138
  • Thumbnail: Page 
139
    139
  • Thumbnail: Page 
140
    140
  • Thumbnail: Page 
141
    141
  • Thumbnail: Page 
142
    142
  • Thumbnail: Page 
143
    143
  • Thumbnail: Page 
144
    144
  • Thumbnail: Page 
145
    145