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Physiological and molecular characterization of Fe acquisition by tomato plants from natural Fe complexes.
- Source :
-
Biology & Fertility of Soils . Feb2013, Vol. 49 Issue 2, p187-200. 14p. - Publication Year :
- 2013
-
Abstract
- The aim of this work is to evaluate the capability of tomato plants to use different Fe sources, such as Fe citrate, Fe phytosiderophores, and Fe complexed by a water-extractable humic substances (Fe-WEHS) also in relation to physiological and molecular adaptations induced by these complexes at the root level. Tomato plants acquired higher amounts of Fe from Fe-WEHS than from the other two sources and this phenomenon occurred only when the treatment lasted 24 h. The higher acquisition of Fe from Fe-WEHS than other sources depended on a reductive mechanism and on rhizosphere acidification and appeared to be due neither to a higher apoplastic loading nor to a higher resistance of WEHS to microbial degradation. Supply of the different Fe complexes to deficient plants induced a transient upregulation of Fe(III)-chelate reductase ( LeFRO1) and Fe transporter genes, LeIRT1 and LeIRT2. In Fe-WEHS-fed plants, where a quicker and higher upregulation of these genes was evident, a coordination in the expression of LeFRO1, LeIRT1, and LeIRT2 genes occurred already after 1 h treatment when the amount of Fe acquired by the plants from the three sources was similar. Iron from Fe-WEHS could be efficiently acquired in a mixture of natural Fe complexes possibly occurring in the rhizosphere. This phenomenon is due to an altered expression of Fe uptake-related genes and to the root capacity to create favorable conditions for the micronutrient uptake into the rhizosphere. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TOMATOES
*HUMUS
*IRON
*PLANT growth
*SOIL solutions
*MOLECULAR weights
Subjects
Details
- Language :
- English
- ISSN :
- 01782762
- Volume :
- 49
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Biology & Fertility of Soils
- Publication Type :
- Academic Journal
- Accession number :
- 85133852
- Full Text :
- https://doi.org/10.1007/s00374-012-0706-1