Physiological and molecular aspects of sulphate uptake in two maize hybrids in response to S-deprivation
Two maize hybrids (KW2 and KW7), chosen on the basis of their productivity with low nutritional input, showed different physiological strategies, with opposite sulphate uptake Vmax and Km values, in response to sulphate deprivation. In order to characterise the physiological differences between the...
| Publié dans: | Journal of plant physiology. - 1979. - 160(2003), 2 vom: 15. Feb., Seite 167-73 |
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| Auteur principal: | |
| Autres auteurs: | , , |
| Format: | Article |
| Langue: | English |
| Publié: |
2003
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| Accès à la collection: | Journal of plant physiology |
| Sujets: | Comparative Study Journal Article Research Support, Non-U.S. Gov't Anion Transport Proteins DNA, Plant RNA, Messenger RNA, Plant Sulfates Sulfur 70FD1KFU70 plus... |
| Résumé: | Two maize hybrids (KW2 and KW7), chosen on the basis of their productivity with low nutritional input, showed different physiological strategies, with opposite sulphate uptake Vmax and Km values, in response to sulphate deprivation. In order to characterise the physiological differences between the two hybrids, sulphate influx rates were measured in different nutritional conditions. When grown for 7 days in S-deprived solution, significantly higher influx rates were measured in roots of KW7 than KW2. Withdrawal of sulphate, after 7 days in presence of S, induced the derepression of the sulphate transport system in both hybrids. However, maize hybrid KW2 seemed to have a more rapid activation than that of KW7, which, in turn, seemed to be more resistant to prolonged sulphur deprivation. The data obtained were not supported by the outcome of the analysis of mRNA abundance, performed with the homologue probe ZmST1 on roots of both hybrids. Root sulphate and glutathione contents were in all cases higher in KW7 than KW2. The discrepancy between the physiological and the molecular data suggests the possible existence of other root transporters involved in sulphate uptake, and/or of some post-transcriptional regulatory mechanisms |
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| Description: | Date Completed 27.05.2003 Date Revised 30.09.2020 published: Print Citation Status MEDLINE |
| ISSN: | 1618-1328 |