Abstract
Hyperhydricity can cause significant loss in the in vitro propagated plantlets. In order to predict and control its occurrence, a better understanding of the structural aspects and physiological features of hyperhydric plantlets is required. In this study, the ultrastructural and physiological changes associated with hyperhydric red beet plantlets were investigated. Our objective was to establish a correlation between the ultrastructural aspects of Beta vulgaris var. Conditiva leaflets and hypocotyls and the content of chlorophyll pigments extracted in N,N-dimethylformamide (DMF) of two type of plantlets: hyperhydric from a basal culture medium Murashige and Skoog (JAMA 15:473–497, 1962) prepared with distilled water (DW—155 ppm Deuterium) and non-hyperhydric, cultivated on identical medium where distilled water was replaced with deuterium depleted water (DDW- 25 ppm Deuterium) as a method of preventing hyperhydricity. Cell ultrastructure in hyperhydricity, both from the leaves, but especially from hypocotyls, showed denatured chloroplasts in a myxoplasm mass formed by the damage of the tonoplast and the mixing of the cytoplasm with the vacuolar juice. The nuclei were picnotic, presenting paranucleolar corpuscles. The amount of assimilating pigments was significantly reduced in the plantlets grown on medium prepared with DW as compared to the normal, non-hyperhydric ones from medium prepared with DDW. Both evaluations showed that, in red beet, DDW also prevents the appearance of hyperhydricity.
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Abbreviations
- Ca :
-
Chlorophyll a
- Cb :
-
Chlorophyll b
- DMF:
-
N,N-dimethylformamide
- DW:
-
Distilled water
- DDW:
-
Deuterium depleted water
- MB-MS:
-
Basal medium Murashige–Skoog
- PAs:
-
Polyamines
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Acknowledgements
In memoriam This article is dedicated to the memory of remarkable Dr. Constantin Crăciun, director of the Electron Microscopy Centre (EMC) of Babes-Bolyai University, Cluj-Napoca who invested a lot of enthusiasm and energy to electron microscopy and who initiated me in the mysteries of cell ultrastructure. The author also thanks Dr. Dorina Cachiță, from University of Oradea, for the mentoring activity in plant tissue culture and also to the EMC of Babes-Bolyai University’s Molecular Biology and Biotechnology Department (Cluj-Napoca, Romania) for the electron microscopy analysis.
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Petruş-Vancea, A. Cell ultrastructure and chlorophyll pigments in hyperhydric and non-hyperhydric Beta vulgaris var. Conditiva plantlets, treated with deuterium depleted water. Plant Cell Tiss Organ Cult 135, 13–21 (2018). https://doi.org/10.1007/s11240-018-1439-0
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DOI: https://doi.org/10.1007/s11240-018-1439-0