hca: an Arabidopsis mutant exhibiting unusual cambial activity and altered vascular patterning. Pineau, C., Freydier, A., Ranocha, P., Jauneau, A., Turner, S., Lemonnier, G., Renou, J., Tarkowski, P., Sandberg, G., Jouanin, L., Sundberg, B., Boudet, A., Goffner, D., & Pichon, M. The Plant Journal, 44(2):271–289, 2005. _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-313X.2005.02526.x![hca: an Arabidopsis mutant exhibiting unusual cambial activity and altered vascular patterning [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex By screening a T-DNA population of Arabidopsis mutants for alterations in inflorescence stem vasculature, we have isolated a mutant with a dramatic increase in vascular tissue development, characterized by a continuous ring of xylem/phloem. This phenotype is the consequence of premature and numerous cambial cell divisions in both the fascicular and interfascicular regions that result in the loss of the alternate vascular bundle/fiber organization typically observed in Arabidopsis stems. The mutant was therefore designated high cambial activity (hca). The hca mutation also resulted in pleiotropic effects including stunting and a delay in developmental events such as flowering and senescence. The physiological characterization of hca seedlings in vitro revealed an altered auxin and cytokinin response and, most strikingly, an enhanced sensitivity to cytokinin. These results were substantiated by comparative microarray analysis between hca and wild-type plants. The genetic analysis of hca indicated that the mutant phenotype was not tagged by the T-DNA and that the hca mutation segregated as a single recessive locus, mapping to the long arm of chromosome 4. We propose that hca is involved in mechanisms controlling the arrangement of vascular bundles throughout the plant by regulating the auxin–cytokinin sensitivity of vascular cambial cells. Thus, the hca mutant is a useful model for examining the genetic and hormonal control of cambial growth and differentiation.
@article{pineau_hca_2005,
title = {hca: an {Arabidopsis} mutant exhibiting unusual cambial activity and altered vascular patterning},
volume = {44},
issn = {1365-313X},
shorttitle = {hca},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-313X.2005.02526.x},
doi = {10/c4jjf5},
abstract = {By screening a T-DNA population of Arabidopsis mutants for alterations in inflorescence stem vasculature, we have isolated a mutant with a dramatic increase in vascular tissue development, characterized by a continuous ring of xylem/phloem. This phenotype is the consequence of premature and numerous cambial cell divisions in both the fascicular and interfascicular regions that result in the loss of the alternate vascular bundle/fiber organization typically observed in Arabidopsis stems. The mutant was therefore designated high cambial activity (hca). The hca mutation also resulted in pleiotropic effects including stunting and a delay in developmental events such as flowering and senescence. The physiological characterization of hca seedlings in vitro revealed an altered auxin and cytokinin response and, most strikingly, an enhanced sensitivity to cytokinin. These results were substantiated by comparative microarray analysis between hca and wild-type plants. The genetic analysis of hca indicated that the mutant phenotype was not tagged by the T-DNA and that the hca mutation segregated as a single recessive locus, mapping to the long arm of chromosome 4. We propose that hca is involved in mechanisms controlling the arrangement of vascular bundles throughout the plant by regulating the auxin–cytokinin sensitivity of vascular cambial cells. Thus, the hca mutant is a useful model for examining the genetic and hormonal control of cambial growth and differentiation.},
language = {en},
number = {2},
urldate = {2021-06-11},
journal = {The Plant Journal},
author = {Pineau, Christophe and Freydier, Amandine and Ranocha, Philippe and Jauneau, Alain and Turner, Simon and Lemonnier, Gaëtan and Renou, Jean-Pierre and Tarkowski, Petr and Sandberg, Göran and Jouanin, Lise and Sundberg, Björn and Boudet, Alain-Michel and Goffner, Deborah and Pichon, Magalie},
year = {2005},
note = {\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-313X.2005.02526.x},
keywords = {Arabidopsis thaliana, Complete Arabidopsis Transcriptome MicroArray (CATMA), cambium, cytokinin hypersensitivity, secondary xylem, vascular patterning},
pages = {271--289},
}
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This phenotype is the consequence of premature and numerous cambial cell divisions in both the fascicular and interfascicular regions that result in the loss of the alternate vascular bundle/fiber organization typically observed in Arabidopsis stems. The mutant was therefore designated high cambial activity (hca). The hca mutation also resulted in pleiotropic effects including stunting and a delay in developmental events such as flowering and senescence. The physiological characterization of hca seedlings in vitro revealed an altered auxin and cytokinin response and, most strikingly, an enhanced sensitivity to cytokinin. These results were substantiated by comparative microarray analysis between hca and wild-type plants. The genetic analysis of hca indicated that the mutant phenotype was not tagged by the T-DNA and that the hca mutation segregated as a single recessive locus, mapping to the long arm of chromosome 4. 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