Responses of the resurrection plant <Emphasis Type="Italic">Haberlea rhodopensis</Emphasis> to high irradiance |
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Authors: | K Georgieva S Lenk C Buschmann |
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Institution: | 1.Institute of Plant Physiology,Bulgarian Academy of Sciences,Sofia,Bulgaria;2.Botanisches Institut II (Molekularbiologie und Biochemie der Pflanzen),Universit?t Karlsruhe,Karlsruhe,Germany |
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Abstract: | The effect of high irradiance (HI) during desiccation and subsequent rehydration of the homoiochlorophyllous desiccation-tolerant
shade plant Haberlea rhodopensis was investigated. Plants were irradiated with a high quantum fluence rate (HI; 350 μmol m−2 s−1 compared to ca. 30 μmol m−2 s−1 at the natural rock habitat below trees) and subjected either to fast desiccation (tufts dehydrated with naturally occurring
thin soil layers) or slow desiccation (tufts planted in pots in peat-soil dehydrated by withholding irrigation). Leaf water
content was 5 % of the control after 4 d of fast and 19 d of slow desiccation. Haberlea was very sensitive to HI under all conditions. After 19 d at HI, even in well-watered plants there was a strong reduction
of rates of net photosynthesis and transpiration, contents of chlorophyll (Chl) and carotenoids, as well as photosystem 2
activity (detected by the Chl fluorescence ratio RFd). Simultaneously, the blue/red and green/red fluorescence ratios increased considerably suggesting increased synthesis of
polyphenolic compounds. Desiccation of plants in HI induced irreversible changes in the photosynthetic apparatus and leaves
did not recover after rehydration regardless of fast or slow desiccation. Only young leaves survived desiccation. |
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Keywords: | Additional" target="_blank">Additional carotenoids chlorophyll fluorescence desiccation tolerant plant drought stress fluorescence imaging leaf area net photosynthetic rate transpiration rate water use efficiency |
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