Publication Date:
1987-12-01
Description:
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.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
