Abstract
Haberlea rhodopensis is a homoiochlorophyllous desiccation-tolerant plant growing mostly in shaded rock rifts below the trees at very low light intensity. These shade plants are very sensitive to photoinhibition and do not survive desiccation at irradiance of 350 μmol m−2 s−1, whereas plants growing on the top of rocks exposed to full sunlight (sun plants) can survive at even higher light intensities regularly. The aim of the present study was to establish how acclimation to different light intensities influences the expression of selected drought-responsive genes and the physiological activity during desiccation of shade and sun plants under controlled culture conditions. The photosynthetic activity was higher in sun plants not only when fully hydrated but also during dehydration. Thus, the higher photosynthetic capacity, reflected in PSII but especially in PSI activity, is accompanied by a reduced susceptibility to photodamage. For most of the genes examined, drought was the main factor in regulation; in addition, some were light modulated like genes coding for putative superoxide dismutase (SOD), ascorbate peroxidase (APX) and thioredoxin (TRX), whereby the former was almost purely light regulated. Differences between sun and shade plants concerned mainly on the time course. Whereas some genes reacted already at moderate desiccation only in sun plants (genes for monodehydroascorbate reductase (MDAR), plastidic translocase (PTL) similar to OEP16 and one of the genes, newly annotated ELIP-like, specific for H. rhodopensis), especially a gene for a putative UDP-glucuronic acid decarboxylase (UDP) retained its enhanced expression longer during recovery. Thus, these genes are probably especially important for survival and recovery in sun plants.
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We gratefully acknowledge support from the DAAD (grant number 54392417) and Bulgarian Science Fund (DNTS/Germany 01/0001).
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Mihailova, G., Abakumov, D., Büchel, C. et al. Drought-Responsive Gene Expression in Sun and Shade Plants of Haberlea rhodopensis Under Controlled Environment. Plant Mol Biol Rep 35, 313–322 (2017). https://doi.org/10.1007/s11105-017-1025-3
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DOI: https://doi.org/10.1007/s11105-017-1025-3