Phosphorus allocation in flooded loblolly pine seedlings in relation to iron uptake
| Autor: | J. R. Woodruff, S. U. Wallace, M. R. McKevlin, W. H. Mckee, D. D. Hook |
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| Rok vydání: | 1987 |
| Předmět: | |
| Zdroj: | Canadian Journal of Forest Research. 17:1572-1576 |
| ISSN: | 1208-6037 0045-5067 |
| DOI: | 10.1139/x87-241 |
| Popis: | To determine whether P allocation in loblolly pine (Pinustaeda L.) seedlings is related to uptake of Fe2+ and its subsequent oxidation and precipitation out of the transpiration stream, newly germinated and 1 -year-old loblolly pine seedlings were grown in flooded and drained pots in a glasshouse for 24 to 28 weeks. The foliage of the younger seedlings grown in flooded pots exhibited P deficiency symptoms and had lower P concentrations, averaging 63% of those for drained seedling foliage. The older seedlings did not develop P deficiency symptoms but flooding resulted in P concentrations in the foliage averaging only 66% of those for drained seedlings. In both newly germinated and 1-year-old seedlings, P concentrations of the roots from flooded pots were 158 and 25% higher, respectively, than those of the roots from drained pots. Flooding also resulted in significantly higher Fe concentrations in all seedling components. Fe concentrations in roots were positively correlated with P concentrations in roots and negatively correlated with P concentrations in stems and foliage. Implications are that excessive concentrations of Fe in and on the roots interfered with the movement of P into stems and foliage. |
| Databáze: | OpenAIRE |
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