Some properties of ferric citrate relevant to the iron nutrition of plants
Ferric citrate, the form in which iron is transported in dicotyledonous plants, diffuses slowly through cotton cellulose dialysis membranes, used to serve as a model for plant cell walls. KCl at m M concentrations stimulates diffusion.
Photoreduction of ferric citrate results in a rapid and nearly complete reduction of iron when the citrate concentration is low (50 μM) as in the xylem sap of plants growing on non-calcareous soils. In 1 m M citrate, as in the xylem sap of plants that activate their Fe-efficiency reactions, fast reoxidation prevents the buildup of high ferrous levels until after citrate has been largely broken down by photodestruction.
Photodestruction of citrate, catalyzed by iron, results in increase of pH in the solution and in the formation of a non-dialyzable form of iron, and thus can lead to deposition of ‘inactive’ iron in leaves.
Key wordschlorosis citrate iron lime
Unable to display preview. Download preview PDF.
- Barak, P and Chen, Y 1984 J. Plant Nutr. 7, 125–133.Google Scholar
- Bennett, J et al. 1982 J. Plant Nutr. 5, 335–344.Google Scholar
- Benrath, A 1910 Z. Phys. Chem. 74, 115–124.Google Scholar
- Brown, J C et al. 1979 Plant Physiol. 63, 692–695.Google Scholar
- Cline, G R et al. 1982 Soil Sci. Soc. Am. J. 46, 1158–1164.Google Scholar
- Cornett, J D and Johnson, G V 1991 In Iron Nutrition and Interactions in Plants. Eds. Y Chen and Y Hadar. pp 95–100. Kluwer Academic Publishers, Dordrecht.Google Scholar
- De Vos, C R et al. 1986 Plant Physiol. 81, 842–846.Google Scholar
- Federico, S and Giartosio, C E 1983 Plant Physiol. 73, 182–184.Google Scholar
- Frahn, J L 1958 Aust. J. Chem. 11, 399–405.Google Scholar
- Gris, E 1844 C. R. Acad. Sci. (Paris) 19, 1118–1119.Google Scholar
- Hoffer, G N and Trost, J F 1926 Agron. J. 15, 323–331.Google Scholar
- Kinzel, H 1982 Pflanzenökologie und Mineralstoffwechsel. Eugen Ulmer, Stuttgart.Google Scholar
- Mengel, K and Geurtzen, G 1986 J. Plant Nutr. 9, 161–173.Google Scholar
- Mengel, K and Geurtzen, G 1988 Physiol. Plant. 72, 460–465.Google Scholar
- Pate, J S 1975 In Encyclopedia of Plant Physiology N.S. Vol I. Eds. M H Zimmermann and J A Milburn. pp 451–473. Springer Verlag, Berlin.Google Scholar
- Römheld, V and Marschner, H 1981 Physiol. Plant. 53, 354–360.Google Scholar
- Römheld, V and Marschner, H 1986 Adv. Plant Nutr. 2, 155–204.Google Scholar
- Terry, N and Abadia, J 1986 J. Plant Nutr. 9, 609–646.Google Scholar
- Tiffin, L O 1966a Plant Physiol. 41, 510–514.Google Scholar
- Tiffin, L O 1966b Plant Physiol. 41, 515–518.Google Scholar
- Tiffin, L O 1972 Plant Physiol. 45, 280–283.Google Scholar