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Genotype x Fertilizer Interactions in Slash Pine: Variation in Phosphate (33P) Incorporation

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Variation in 33P incorporation in acid-soluble (AS), nucleic acid (NA) and phospholipid-phosphoprotein (PL) phosphate fractions in roots were investigated for three families of slash pine (Pinus elliottii) under five N/P fertilizer regimes. Height and weight growth and P accumulation as acid soluble P in shoot terminals were also characterized for comparisons. Phosphate incorporation was largely determined by the P status of the seedlings as higher levels were assayed in organic fractions of seedlings under low P than when grown with high P. Both N level and family also affected incorporation. Interactions suggested that some families accumulate P differentially under various fertilizer treatment regimes. Certain families also translocated more P to shoots. Highest P incorporation in shoot terminals was under the N50P50 treatment. Families that accumulated more P in roots generally showed higher P activities in the shoot terminal. Families also interacted with fertilizer treatment in this measure. Incorporation of P in the acid-soluble fraction of shoot terminals was closely correlated with height growth and top fresh weight. This study indicates that in slash pine seedlings early selection for phosphate incorporation into metabolic fractions can be conducted as a correlated response to growth. Because of the effect of fertility regime and the interactions of these with families, selections should be conducted under nutrient regimes typical of the expected growth medium of the trees. Forest Sci. 22:21-30.
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Keywords: Nutrition; fertilizer; forest fertilization; genetics; organic phosphate; tree improvement

Document Type: Journal Article

Affiliations: Associate Professor (Forest Genetics), School of Forest Resources and Conservation, University of Florida, Gainesville, Florida, 32611

Publication date: 1976-03-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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