Abstract
Light has been found to increase the proportion of tracheary elements differentiating in callus cultures derived from xylem-parenchyma of Pinus radiata D. Don grown on an induction medium containing activated charcoal but no phytohormones. The differentiation rate increased from 20% when callus was grown in darkness to 45% when callus was grown with a 16 h or 24 h photoperiod. When callus was grown with a 16 h photoperiod, tracheary elements were observed 2 days after transfer of callus to the induction medium, as compared to 5 days when callus was cultured in darkness. The differentiation rate was also influenced by the concentration of activated charcoal added to the induction medium, the optimum concentration being 5 g l−1. Exclusion of activated charcoal from the induction medium decreased the differentiation rate to 2%. The activities of the lignin-related enzymes L-phenylalanine ammonia lyase and cinnamyl alcohol dehydrogenase were significantly higher in cell cultures grown with a 16 h photoperiod as compared to when grown in darkness. The results show that light had a stimulating effect on tracheary element differentiation and the activities of lignin-related enzymes in P. radiata callus cultures. The new growth conditions markedly improve this cell culture system and make it particularly useful for functional gene testing and cell-wall analysis of in vitro grown tracheary elements of coniferous gymnosperms.
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Abbreviations
- 2,4-D:
-
2,4-dichlorophenoxyacetic acid
- BAP:
-
6-benzylaminopurine
- CAD:
-
cinnamyl alcohol dehydrogenase
- PAL:
-
phenylalanine ammonia lyase
- TE:
-
tracheary element
- TGAL:
-
thioglycolic acid lignin
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Acknowledgements
This research was funded by the New Zealand Foundation for Research, Science and Technology (RFI). We thank M. Brown, G. Carroll, K. Hignett and C. Fok for technical support.
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Möller, R., Ball, R.D., Henderson, A.R. et al. Effect of Light and Activated Charcoal on Tracheary Element Differentiation in Callus Cultures of Pinus Radiata D. Don. Plant Cell Tiss Organ Cult 85, 161–171 (2006). https://doi.org/10.1007/s11240-005-9065-z
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DOI: https://doi.org/10.1007/s11240-005-9065-z