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  • 4 Post By Magnus A

Dendrobium kingianum, high light and Anthocyanins

This is a discussion on Dendrobium kingianum, high light and Anthocyanins within the **NOT IN BLOOM** All Genera forums, part of the Orchid Photography category; Hi I think this is interesting and a good example of high light exposure. I ...

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  1. #1
    Magnus A's Avatar
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    Default Dendrobium kingianum, high light and Anthocyanins

    Hi

    I think this is interesting and a good example of high light exposure.

    I took this picture of my Dendrobium kingianums adopted and exposed to full sun on my balkony. The sun hits the plant at 1 pm and stays to late and the plant has been standing next to each other for 2-3 weeks under the same condition.
    The growth of this year clearly show how orchids react to high light.

    The numbering key:

    leaf 1: D. kingianum last year growth
    leaf 2: D. kingianum this year growth
    leaf 3: D. Kingianum var alba last year growth
    leaf 4: D. Kingianum var alba this year growth

    In the new growth of the normal form (leaf 2) the presence of Anthocyanins (purple color) is clearly shown that is completely missing in the alba form (leaf 4). It is not as obvious in the older growths but there is a clear difference between the plants when observed under lower light. The normal form has a redish taint and slightly darker leaf than the alba form.

    The Anthocyanins are responsibly for the purple to pink color (missing in the alba version) and they help protect the plant from high light. The normal form could handle higher light levels but the alba form is on it's limit as it starting to lose the healthy green color turning pale yellow.

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    Last edited by Magnus A; July 3rd, 2012 at 09:27 AM. Reason: Correction of key...

  2. #2
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    Default

    Interesting observation, that has been the focus of many a discussion here. Thanks for posting it.

  3. #3
    catttan's Avatar
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    Very interesting !

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