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Effects of nitrogen limitation on water relations of jack pine (Pinus banksiana Lamb.) seedlings (1995)

TAN, W. ; HOGAN, G. D.

Oxford, UK : Blackwell Publishing Ltd

Plant, cell & environment 18 (1995), S. 0

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ISSN: 1365-3040

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The water relations of shoots of young jack pine (Pinus banksiana Lamb.) seedlings were examined 6 and 15 weeks after the initiation of four different dynamic nitrogen (N) treatments using a pressure-volume analysis. The N treatments produced a wide range of needle N concentrations from 12 to 32 mg g−1 dry mass and a 10-fold difference in total dry mass at 15 weeks. Osmotic potential at full turgor did not change over the range of needle N concentrations observed. Osmotic potential at turgor-loss point, however, declined as N concentrations decreased, indicating an increased ability of N-deficient jack pine plants to maintain turgor. The increase could be attributed largely to an increase in cell wall elasticity, suggesting that elasticity changes may be a common, significant adaptation of plants to environmental stresses. Dry mass per unit saturated water almost doubled as needle N level dropped from 32 to 12 mg g−1 and was inversely correlated to the bulk modulus of elasticity. This suggests that cell wall elasticity is determined more by the nature of its cross-linking matrix than by the total amount of cell wall material present. Developmental change was evident in the response of some water relation variables to N limitation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-3040.1995.tb00578.x

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Establishment-year height growth in hybrid poplars; relations with longer-term growth (1996)

Brown, K. R. ; Beall, F. D. ; Hogan, G. D.

Springer

New forests 12 (1996), S. 175-186

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ISSN: 1573-5095

Keywords: Populus ; age-age correlations

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract We examined the potential for using components of establishment-year height growth in predicting longer-term growth rankings of six hybrids of Populus deltoides × nigra and one of P. nigra × maximowiczii. Height rankings at the end of the establishment year were correlated (P ≤ 0.10) amongst the four field trials and were generally stable from 38 days after planting onward. End-of-season height rankings from field trials and a controlled environment trial were weakly correlated. Height rankings at the end of the first year did not correlate with rankings at the end of the fifth year, correlations with fifth-year ranks did improve in the second and third years. Shifts in clonal rankings after the establishment year may have been associated with (1) a decreased influence of the planted cutting on growth after the establishment year (2) clonal differences in the time of budburst which were minimized at the time of planting (3) clonal differences in late-season photosynthate allocation to roots (4) clonal differences in branching patterns and canopy development after the establishment year.