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  • Relative growth rate  (2)
  • Gas exchange  (1)
  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 79 (1989), S. 542-550 
    ISSN: 1432-1939
    Keywords: Bromus ; Relative growth rate ; Nitrate uptake ; Limiting external concentration ; Grasses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two annual species of Bromus, an invader (B. hordeaceus, ex B. mollis) and a non-invader (B. intermedius), were grown for 28 days in growth chambers, at 5 and 100 μM NO 3 - in flowing nutrient solution. No differences between the two species were observed at either NO 3 - level, in terms of relative growth rate (RGR) or its components, dry matter partitioning, specific NO 3 - absorption rate, nitrogen concentration, and other characteristics of NO 3 - uptake and photosynthesis. The effects of decreasing NO 3 - concentration in the solution were mainly to decrease the NO 3 - concentration in the plants through decreased absorption rate, and to decrease the leaf area ratio through increased specific leaf mass and decreased leaf mass ratio. Organic nitrogen concentration varied little between the two treatments, which may be the reason why photosynthetic rates were not altered. Consequently, RGR was only slightly decreased in the 5-μM treatment compared to the 100-μM treatment. This is in contrast with other species, where growth is reduced at much higher NO 3 - concentrations. These discrepancies may be related to differences in RGR, since a log-linear relationship was found between RGR and the NO 3 - concentration at which growth is first reduced. In addition, a strong linear relationship was found between the RGR of these species and their maximum absorption rate for nitrate, suggesting that the growth of species with low maximum RGR may be partly regulated by nutrient uptake.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 76 (1988), S. 158-159 
    ISSN: 1432-1939
    Keywords: Energy content ; Relative growth rate ; Seed weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Relative growth rate in radish is not influenced by initial seed weight.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1939
    Keywords: Diplacus aurantiacus (Curtis) Jeps. ; Heteromeles arbutifolia (Ait.) Roem. ; Gas exchange ; Irrigation ; Sulphur dioxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Experiments were performed on an evergreen (Heteromeles arbutifolia) and a drought deciduous shrub (Diplacus aurantiacus) to determine, 1) whether approaches for evaluating SO2 absorption by leaves in laboratory studies could be extended to field studies, 2) the effects of irrigation on metabolism and SO2 responses of the study species during a season when water was limiting, 3) to interpret SO2 responses on the basis of SO2 flux rates. Laboratory-developed approaches for evaluating SO2 absorption by leaves were found to be suitable for use with field plants, despite field plants having lower gas exchange rates. Supplementing water during times of deficit did not override all the biological and environmental factors that limited photosynthesis (A). Irrigation increased leaf longevity of D. aurantiacus, and stomatal conductance to water vapour (g); g was also shown to increase with H. arbutifolia on irrigation. Irrigation profoundly influenced plant response to SO2. Unwatered D. aurantiacus had only a small g and therefore a reduced capacity to absorb SO2 and respond to SO2; which resulted in apparent SO2 avoidance. Water availability and SO2 both affect g and therefore, SO2 flux rates into the mesophyll. Different ambient SO2 concentrations of 8.3 and 26.2 μmol m-3 (0.2 and 0.6 ppm) were both found to result in similar SO2 flux rates into the leaf, due to variations in g in response to water availability. Changes in g did not always result in changes in A, implying that carbon fixation may be little affected by some SO2 exposures, although still potentially affecting such processes as maintenance of leaf water potential, transpirational cooling and nutrient uptake.
    Type of Medium: Electronic Resource
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