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  • Articles  (6)
  • Nitrogen  (3)
  • Serpentine  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Resource sharing among ramets in the clonal herb, Fragaria chiloensis (1986)
    Springer
    Oecologia 70 (1986), S. 227-233 
    Details
    ISSN: 1432-1939
    Keywords: Resource sharing ; Carbohydrates ; Water ; Nitrogen ; Fragaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The herbaceous perennial, Fragaria chiloensis, reproduces vegetatively on coastal sand dunes in California by growth of stolons that bear rosettes. Movement of water and photosynthates through stolons integrates water and carbon metabolism of rosettes both before and after they root. New, unrooted rosettes import sufficient water and nitrogen to maintain levels near those of established rosettes; yet support of an unrooted rosette did not decrease growth of a connected, rooted sibling given abundant light, water, and soil nutrients. Under such conditions strings of unrooted rosettes with the associated stolon appeared self-sufficient for carbon; shade and drought induced import of photosynthates. New rosettes produced and maintained a limited root mass upon contact with dry sand, which could increase probability of establishment. Rooting did not induce senescence of stolons. Connection between two established rosettes prevented death by drought and shade, even when neither rosette could have survived singly. Results suggest that physiological integration of connected rosettes may increase total growth of clones of F. chiloensis through sharing of resources among ramets, especially when resource availability is changeable or patchy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379244
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  • 2
    Electronic Resource
    Electronic Resource
    Growth, photosynthesis and storage of carbohydrates and nitrogen in Phaseolus lunatus in relation to resource availability (1995)
    Springer
    Oecologia 104 (1995), S. 17-23 
    Details
    ISSN: 1432-1939
    Keywords: Carbohydrate ; Growth ; Nitrogen ; Phaseolus lunatus ; Storage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth, photosynthesis, and storage of nitrogen (N) and total non-structural carbohydrates (TNC) of a perennial wild type and an annual cultivar of lima bean (Phaseolus lunatus) were examined at different light intensities and N supplies. Relative growth rate and photosynthesis increased with light and N availability. N limitation enhanced biomass allocation into root rather than into shoot, while light limitation enhanced growth of leaf area. The TNC concentrations increased with light intensity and thus with photosynthesis, while the concentrations of organic N and nitrate decreased. Increasing N supply had the opposite effect. Therefore, TNC and organic N concentrations were negatively correlated (r=−0.90). Pool size of N or TNC increased with N and light availability when either resource was non-limiting, but increased little or remained constant when either resource was limiting. Storage reached a minimum when both resources were supplied at an equal rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365557
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  • 3
    Electronic Resource
    Electronic Resource
    Biomass accumulation and resource utilization in co-occurring grassland annuals (1986)
    Springer
    Oecologia 70 (1986), S. 555-558 
    Details
    ISSN: 1432-1939
    Keywords: Serpentine ; Annuals ; Water-use ; Nitrogenuse ; Reproduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Mediterranean-climate annuals growing on serpentine soils in central California differ greatly in their life spans and reproductive periods dependent on their access to soil moisture. The longer-lived annuals accumulate a greater lifetime biomass, have a higher total, but lower proportional, reproductive output, and produce leaves with a higher C/N ratios at the time of reproduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379903
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  • 4
    Electronic Resource
    Electronic Resource
    Gopher mound soil reduces growth and affects ion uptake of two annual grassland species (1987)
    Springer
    Oecologia 72 (1987), S. 284-290 
    Details
    ISSN: 1432-1939
    Keywords: Annual grassland ; Serpentine ; Microelements ; Gopher mound ; Ion uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Portions of an annual serpentine grassland community in California are subject to frequent gopher mound formation. Consequently, studies were undertaken to characterize the effects of mound soils on plant growth and ion uptake. For two of the dominant annual species (Bromus mollis L. and Plantago erecta Morris), growth was reduced in gopher mound soil relative to that in inter-mound soil. A similar reduction in growth was found for plants grown in soils collected at a depth corresponding to the depth of gopher burrowing. This reduction in growth was associated with lower total P and N contents of the soil which were reflected in lower shoot contents of N and P. Additional experiments, however, showed that reduced N and P availabilities in mound soil were not entirely responsible for the growth reduction. Similarly, shoot Ca/Mg ratios were reduced in mound soil but additions of Ca improved the Ca/Mg ratio without improving growth. Growth reductions were associated with altered shoot concentrations of microelements, particularly elevated levels of Mn. A competition experiment between Plantago and Bromus showed that Bromus was more competitive than Plantago in mound and inter-mound soils and that soil type had only small affects on the nature of the interaction between the two species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00379280
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of fertiliser addition and subsequent gopher disturbance on a serpentine annual grassland community (1988)
    Springer
    Oecologia 75 (1988), S. 291-295 
    Details
    ISSN: 1432-1939
    Keywords: Annual grassland ; Serpentine ; Nutrient addition ; Gophers ; Mulch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Application of slow release fertiliser to small (0.5x1 m) plots within a serpentine annual grassland community led to significant increases in above-ground biomass and a shift in species relative abundances. In fertilised plots the native forb species which usually dominate the grassland were almost totally replaced by grasses. In the years following initial fertiliser application, a heavy mulch formed from the previous year's grass growth allowed establishment of grass species such as Bromus mollis but significantly reduced forb establishment. Gopher disturbance of fertilised plots in the second and third years of the experiment effectively removed the grass mulch and allowed re-establishment of forb species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378612
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  • 6
    Electronic Resource
    Electronic Resource
    Decreased ribulose-1,5-bisphosphate carboxylase-oxygenase in transgenic tobacco transformed with “antisense” rbcS (1992)
    Springer
    Planta 188 (1992), S. 522-531 
    Details
    ISSN: 1432-2048
    Keywords: Nicotiana (photosynthesis) ; Nitrogen ; Photosynthesis (control analysis) ; Ribulose-1,5-bisphosphate carboxylase-oxygenase ; Transgenic plant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of nitrogen supply during growth on the contribution of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco; EC 4.1.1.39) to the control of photosynthesis was examined in tobacco (Nicotiana tabacum L.). Transgenic plants transformed with antisense rbcS to produce a series of plants with a progressive decrease in the amount of Rubisco were used to allow the calculation of the flux-control coefficient of Rubisco for photosynthesis (CR). Several points emerged from the data: (i) The strength of Rubisco control of photosynthesis, as measured by CR, was altered by changes in the short-term environmental conditions. Generally, CR was increased in conditions of increased irradiance or decreased CO2. (ii) The amount of Rubisco in wild-type plants was reduced as the nitrogen supply during growth was reduced and this was associated with an increase in CR. This implied that there was a specific reduction in the amount of Rubisco compared with other components of the photosynthetic machinery. (iii) Plants grown with low nitrogen and which had genetically reduced levels of Rubisco had a higher chlorophyll content and a lower chlorophyll a/b ratio than wild-type plants. This indicated that the nitrogen made available by genetically reducing the amount of Rubisco had been re-allocated to other cellular components including light-harvesting and electron-transport proteins. It is argued that there is a “luxury” additional investment of nitrogen into Rubisco in tobacco plants grown in high nitrogen, and that Rubisco can also be considered a nitrogen-store, all be it one where the opportunity cost of the nitrogen storage is higher than in a non-functional storage protein (i.e. it allows for a slightly higher water-use efficiency and for photosynthesis to respond to temporarily high irradiance).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197044
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