Molecular features of secondary vascular tissue regeneration after bark girdling in Populus
Article first published online: 25 AUG 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 192, Issue 4, pages 869–884, December 2011
How to Cite
Zhang, J., Gao, G., Chen, J.-J., Taylor, G., Cui, K.-M. and He, X.-Q. (2011), Molecular features of secondary vascular tissue regeneration after bark girdling in Populus. New Phytologist, 192: 869–884. doi: 10.1111/j.1469-8137.2011.03855.x
- Issue published online: 11 NOV 2011
- Article first published online: 25 AUG 2011
- Received: 17 May 2011, Accepted: 19 July 2011
- bark girdling;
- Populus tomentosa;
- secondary vascular tissue;
- transcriptome profiling
- •Regeneration is a common strategy for plants to repair damage to their tissue after attacks from other organisms or physical assaults. However, how differentiating cells acquire regenerative competence and rebuild the pattern of new tissues remains largely unknown.
- •Using anatomical observation and microarray analysis, we investigated the morphological process and molecular features of secondary vascular tissue regeneration after bark girdling in trees.
- •After bark girdling, new phloem and cambium regenerate from differentiating xylem cells and rebuild secondary vascular tissue pattern within 1 month. Differentiating xylem cells acquire regenerative competence through epigenetic regulation and cell cycle re-entry. The xylem developmental program was blocked, whereas the phloem or cambium program was activated, resulting in the secondary vascular tissue pattern re-establishment. Phytohormones play important roles in vascular tissue regeneration.
- •We propose a model describing the molecular features of secondary vascular tissue regeneration after bark girdling in trees. It provides information for understanding mechanisms of tissue regeneration and pattern formation of the secondary vascular tissues in plants.