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Details van artikel 2 van 11 gevonden artikelen
| Titel: |
Differential response of dicotyledonous plants to potassium-deficiency stress: Iron-stress response mechanism |
| Auteur: |
Hughes, D. F. Jolley, V. D. Brown, J. C. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 13 (1990) nr. 11 pagina's 1405-1417 |
| Jaar: |
1990-11 |
| Inhoud: |
Iron-efficient tomato and soybean, when subjected to Fe-deficiency stress, required K before the Fe-stress response mechanism would function, ie, would (a) release H ions and reductants from their roots and (b) reduce Fe3+ to Fe2+ in their roots. In previous studies with tomato and soybean, H ion release ceased after Fe was made available to the plant. Muskmelon differed from tomatoes and soybeans in that H ion release was sustained even after Fe was made available. This study was conducted to determine if muskmelon also differs from soybean and tomato plants in its Fe-K relationship. Muskmelon was grown in hydroponic solutions at varying levels of K in combination with low or no Fe and also in various combinations of Na or Rb (as substitutes for K). Hydrogen ion release and reduction of Fe3+ at the roots as well as chlorosis ratings and leaf Fe concentrations were determined. Potassium-deficiency stress did not prevent hydrogen ion release by muskmelon roots as had been previously observed in tomato and soybean. Adequate levels of K were, however, essential to maximizing the reduction of Fe3+ to Fe2+ at the root. Hydrogen ion release was enough of a response to maintain leaf Fe above 50 μg/g even when Fe3+ reduction was low without solution K. Neither Na nor Rb substituted for K in enhancing Fe3+ reduction in muskmelon. Potassium does appear to have a specific role in the Fe-stress response mechanism of dicotyledonous plants when subjected to Fe-deficiency stress. Muskmelon could potentially serve in future studies directed toward defining the genetic differences in dicotyledenous species. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 11 gevonden artikelen
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