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  • 1
    Electronic Resource
    Electronic Resource
    Responses of carboxylating enzymes, sucrose metabolizing enzymes and plant hormones in a tropical epiphytic CAM orchid to CO2 enrichment (2002)
    Oxford, UK : Blackwell Science, Ltd
    Plant, cell & environment 25 (2002), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: After exposure to a doubled CO2 concentration of 750 µL L−1 for 2 months, average relative growth rate (RGR) of Mokara Yellow increased 25%. The two carboxylating enzymes, ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPCase), responded differently to CO2 enrichment. There was a significant daytime down-regulation in Rubisco activity in the leaves of CO2-enriched plants. However, PEPCase activity in CO2-enriched plants was much higher in the dark period, although it was slightly lower during the daytime than that at ambient CO2. Leaf sucrose–phosphate synthase (SPS) and sucrose synthase (SS) activities in CO2-enriched plants increased markedly, along with a night-time increase in total titratable acidity and malate accumulation. There was a remarkable increase in the levels of indole-3-acetic acid (IAA), gibberellins A1 and A3 (GA1+3), isopentenyladenosine (iPA) and zeatin riboside (ZR) in the expanding leaves of plants grown at elevated CO2. It is suggested that (1) the down-regulation of Rubisco and up-regulation of SPS and SS are two important acclimation processes that are beneficial because it enhanced both photosynthetic capacity at high CO2 and reduced resource investment in excessive Rubisco capacity; (2) the increased levels of plant hormones in CO2-enriched M. Yellow might play an important role in controlling its growth and development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0016-8025.2001.00818.x
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon dioxide fixation in orchid aerial roots (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 60 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Acidity fluctuation, CO2 gas exchange, δ13C value, PEP carboxylase and RuBP carboxylase activities in aerial roots of selected thick-leaved orchid hybrids (Arachnis and Aranthera) were studied. Both aerial roots and leaves showed acidity fluctuation over a 24 h period. Dark acidification in aerial roots was enhanced at low temperature (15°C). Aerial roots had δ13C values close to those of leaves which have been previously demonstrated to possess crassulacean acid metabolism. Variation in δ13C values along the length of the roots was observed; the root tip having a less negative δ13C value (—13.34%‰) than the older portions of the roots (—14.55%‰). There was no net CO2 fixation by aerial root, although 1432CO2 fixation was observed in light and in darkness. The pattern of fluctuation in activities of PEP carboxylase and RuBP carboxylase in aerial roots was similar to that obtained for the leaves. In both aerial roots and leaves, PEP carboxylase activity was several times higher than that of RuBP carboxylase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb04557.x
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  • 3
    Electronic Resource
    Electronic Resource
    Rhythmic Production of CO2 by Tropical Orchid Flowers (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 42 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Circadian rhythm of CO2 production was observed in some tropical orchid flowers. The tight bud showed relatively low respiration and no rhythmic changes. As soon as the flower opened, respiration increased and rhythmicity became apparent. The period for the rhythm was about 24 hours. Dark treatment and detachment dampened the amplitude of the rhythm without affecting the rhythmicity. In depollinated and pollinated flowers, the rhythmicity was less pronounced. Pollination and depollination appeared to stimulate respiration at the trough of the cycle. However, there was no significant difference in respiration per day between the untreated and treated flower. Both pollination and depollination hasten the senescence of orchid flowers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb02552.x
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  • 4
    Electronic Resource
    Electronic Resource
    Photosynthetic carbon fixation by isolated maize chloroplasts
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 40 (1970), S. 1356-1361 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(70)90015-X
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  • 5
    Electronic Resource
    Electronic Resource
    Two types of carbon fixation in tropical orchids (1975)
    Springer
    Planta 123 (1975), S. 303-306 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The isotopic composition of the carbon (δ13C values) of leaf tissue from 10 species and hybrids of orchids grown in Singapore fell into two groups, one having a mean value of-15.4‰, the other-26.6‰. The least negative of these values was associated with thick-leaved plants (0.2–0.4 mm). This is consistent with the view that some orchids are CAM plants and others possess a C3 type of carbon fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390710
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of ethylene on enzyme activities and mobilization of materials in pollinatedArachnis orchid flowers (1989)
    Springer
    Journal of plant growth regulation 8 (1989), S. 121-130 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract PollinatedArachnis flowers exhibit morphological changes that are typical of the postpollination phenomena. Associated with these visible changes was the movement of soluble amino nitrogen and phosphorus from the perianth to the column and ovary. A rapid increase in protease and acid phosphatase activities was observed in the perianth, column, and ovary. However, it appeared that the enhanced enzyme activities were not responsible for the mobilization of materials from the perianth to the ovary, though both were induced by ethylene produced following pollination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02025279
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  • 7
    Electronic Resource
    Electronic Resource
    Ethylene production by young Aranda orchid flowers and buds (1988)
    Springer
    Plant growth regulation 7 (1988), S. 217-222 
    Details
    ISSN: 1573-5087
    Keywords: Orchid flowers and buds ; ethylene production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A high rate of ethylene production was observed in buds and young flowers of Aranda orchid, which increased with bud growth, reaching a high value in half-opened flower. This was followed by a gradual decline but it increased again when the flowers showed sign of senescence. Aminooxylacetic acid (AOA) inhibited ethylene production and bud expansion of Aranda buds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028244
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  • 8
    Electronic Resource
    Electronic Resource
    Ethylene induced cyanide resistant respiration in orchid petal cells (1989)
    Springer
    Plant growth regulation 8 (1989), S. 365-373 
    Details
    ISSN: 1573-5087
    Keywords: Ethylene ; cyanide resistant respiration ; orchid cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Respiration of isolated Aranda orchid petal cells increased markedly after cut flowers were treated with ethylene. An increase in respiration was observed 15 to 20h after treatment which was further enhanced in the presence of oxygen and ethylene. Ethylene induces the development of a cyanide resistant pathway in fully opened orchid flower tissues where the cyanide resistant capacity is negligible. However, there appears a shift back to the cyanide sensitive pathway some time after induction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024666
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