Full TGIF Record # 24229
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Author(s):Laan, P.; Smolders, A.; Blom, C. W. P. M.
Author Affiliation:Department of Experimental Botany, University of Nijmegen, Toernooiveld, The Netherlands
Title:The relative importance of anaerobiosis and high iron levels in the flood tolerance of Rumex species
Source:Plant and Soil. Vol. 136, No. 2, October 1991, p. 153-161.
# of Pages:9
Publishing Information:Dordrecht, Netherland: Martinus Nijhoff Publishers
Related Web URL:http://link.springer.com/article/10.1007/BF02150046
    Last checked: 10/14/2015
    Notes: Abstract only
Keywords:TIC Keywords: Rumex; Anaerobes; Iron; Growth rate; Toxicity; Oxygen; Flooding; Root growth; Waterlogging
Abstract/Contents:"In both hydroculture experiments and a greenhouse trial the combined effects of flooding and high iron levels on the growth and occurrence of iron toxicity were investigated in three Rumex species having different flood tolerance. In a hydroculture experiment the plants were subjected to different FeCl2 concentrations and anaerobiosis. At solution iron concentrations exceeding 750 µM, the growth rate of the flood-intolerant R. thyrsiflorus. was sharply decreased. The root system was most negatively affected. Differences between the investigated species could be most likely explained from differences in root porosity and are thus closely related to a differential internal oxygen supply to the root systems. In a greenhouse experiment soil flooding was combined with the addition of different ferrous iron concentrations to the soil solution. Flooding in combinations with the addition of 5 mM ferrous iron did not result in a significant decrease in biomass production of any of the investigated Rumex species, in spite of the fact that several types of shoot iron toxicity were perceived. Especially at high iron levels significant amounts of 'bronzing' spots on the leaves of all species were observed. Petiole iron toxicity symptoms, which result in a sagging of the petioles, was most clearly observed in the flood-intolerant R. thyrsiflorus. Although the hydroculture experiments revealed a severe effect of anaerobiosis and high iron levels on the root development and plant growth rate of especially the flood-intolerant R. thyrsiflorus, no such adverse effects were registered in the greenhouse experiments in neither of the species. This is most probably due to the fact that under greenhouse conditions the Rumex species are able to locally immobilize iron by oxidation, thereby avoiding the actual iron stress. Since biomass production was hardly affected under greenhouse conditions, it is concluded that high iron levels in the soil solution are of minor importance in the different flood tolerance of the Rumex species. It also indicates that great care has to be taken in the interpretation of hydroculture experiments to the actual effect of suggested stress conditions under greenhouse or natural conditions."
Note:Pictures, b/w
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Laan, P., A. Smolders, and C. W. P. M. Blom. 1991. The relative importance of anaerobiosis and high iron levels in the flood tolerance of Rumex species. Plant Soil. 136(2):p. 153-161.
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