Abstract
By inserting entomological needles into the lower parts of young inflorescence stems of three-month-old Arabidopsis thaliana (L.) Heynh var. Colombia plants, we studied the process of regenerative xylem production. Regenerative xylem was formed only in one- to two-day-old inflorescence stems but not in older ones. The regenerative vessels originated from re-differentiation of cortical parenchyma. To characterize the process of regenerative xylem formation, we conducted a histological study from the time of wounding to day 30 after wounding. In the first day after wounding the tissues showed no structural responses except for the wounding itself. After six days, regenerative vessel members were already differentiating in a basipetal pattern, forming a vascular bypass around the wound. Regenerative vessel member formation reached a maximal level on the twelfth day after wounding. Sixteen days after wounding the pith parenchyma started to become loose as if indicating tissue senescence. Altogether, vascular regeneration following wounding in inflorescence stems of Arabidopsis thaliana is similar to that in other dicotyledon plants. These findings provide the basis for the use of Arabidopsis thaliana as a model system to study the genetics, physiology and cell biology of wound healing and regenerative vascular tissue formation.
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Acknowledgements
This study was supported by grants from the Research Authority and the Faculty of Science and Science Education, University of Haifa to S. Lev-Yadun. We thank Gideon Grafi for his help and comments and two anonymous reviewers for their comments.
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Flaishman, M.A., Loginovsky, K. & Lev-Yadun, S. Regenerative Xylem in Inflorescence Stems of Arabidopsis thaliana . J Plant Growth Regul 22, 253–258 (2003). https://doi.org/10.1007/s00344-003-0030-y
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DOI: https://doi.org/10.1007/s00344-003-0030-y