NDLI: Susceptibility of green leaves and green flower petals of CAM orchid Dendrobium cv. Burana Jade to high irradiance under natural tropical conditions

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Susceptibility of green leaves and green flower petals of CAM orchid Dendrobium cv. Burana Jade to high irradiance under natural tropical conditions

Content Provider	Springer Nature Link
Author	He, J. Teo, L. C. D.
Copyright Year	2007
Abstract	Photosynthetic rates of green leaves (GL) and green flower petals (GFP) of the CAM plant Dendrobium cv. Burana Jade and their sensitivities to different growth irradiances were studied in shade-grown plants over a period of 4 weeks. Maximal photosynthetic O$_{2}$ evolution rates and CAM acidities [dawn/dusk fluctuations in titratable acidity] were higher in leaves exposed to intermediate sunlight [a maximal photosynthetic photon flux density (PPFD) of 500–600 µmol m$^{−2}$ s$^{−1}$] than in leaves grown under full sunlight (a maximal PPFD of 1 000–1 200 µmol m$^{−2}$ s$^{−1}$) and shade (a maximal PPFD of 200–250 µmol m$^{−2}$ s$^{−1}$). However, these two parameters of GFP were highest in plants grown under the shade and lowest in full sun-grown plants. Both GL and GFP of plants exposed to full sunlight had lower predawn F$_{v}$/F$_{m}$ [dark adapted ratio of variable to maximal fluorescence (the maximal photosystem 2 yield without actinic irradiation)] than those of shade-grown plants. When exposed to intermediate sunlight, however, there were no significant changes in predawn F$_{v}$/F$_{m}$ in GL whereas a significant decrease in predawn F$_{v}$/F$_{m}$ was found in GFP of the same plant. GFP exposed to full sunlight exhibited a greater decrease in predawn F$_{v}$/F$_{m}$ compared to those exposed to intermediate sunlight. The patterns of changes in total chlorophyll (Chl) content of GL and GFP were similar to those of F$_{v}$/F$_{m}$. Although midday F$_{v}$/F$_{m}$ fluctuated with prevailing irradiance, changes of midday F$_{v}$/F$_{m}$ after exposure to different growth irradiances were similar to those of predawn F$_{v}$/F$_{m}$ in both GL and GFP. The decreases in predawn and midday F$_{v}$/F$_{m}$ were much more pronounced in GFP than in GL under full sunlight, indicating greater sensitivity in GFP to high irradiance (HI). In the laboratory, electron transport rate and photochemical and non-photochemical quenching of Chl fluorescence were also determined under different irradiances. All results indicated that GFP are more susceptible to HI than GL. Although the GFP of Dendrobium cv. Burana Jade require a lower amount of radiant energy for photosynthesis and this plant is usually grown in the shade, is not necessarily a shade plant.
Starting Page	214
Ending Page	221
Page Count	8
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	45
Issue Number	2
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2007-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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