Class 1 KNOX genes are not involved in shoot development in the moss Physcomitrella patens but do function in sporophyte development

Class 1 KNOX genes are not involved in shoot development in the moss Physcomitrella patens but do... SUMMARY Although the number and form of metazoan organs are determined in the embryo, plants continuously form organs via pluripotent stem cells contained within the meristem. Flowering plants have an indeterminate meristem in their diploid generation, whereas the common ancestor of land plants is inferred to have formed an indeterminate meristem in its haploid generation, as observed in the extant basal land plants, bryophytes, including mosses. It is hypothesized that the underlying gene networks for the diploid meristem were initially present in the haploid generation of the basal land plants and were eventually co‐opted for expression in the diploid generation. In flowering plants, the class 1 KNOTTED1‐LIKE HOMEOBOX (KNOX) transcription factors are essential for the function of the indeterminate apical meristem. Here, we show that the class 1 KNOX orthologs function in the diploid organ, with determinate growth in the moss Physcomitrella patens, but do not function in the haploid indeterminate meristem. We propose that the genetic networks governing the indeterminate meristem in land plants are variable, and the networks governing the diploid indeterminate meristem with the class 1 KNOX genes likely evolved de novo in the flowering plant lineage. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Evolution and Development Wiley

Class 1 KNOX genes are not involved in shoot development in the moss Physcomitrella patens but do function in sporophyte development

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Publisher
Wiley
Copyright
© 2008 The Author(s). Journal compilation © 2008 Wiley Periodicals, Inc.
ISSN
1520-541X
eISSN
1525-142X
DOI
10.1111/j.1525-142X.2008.00271.x
Publisher site
See Article on Publisher Site

Abstract

SUMMARY Although the number and form of metazoan organs are determined in the embryo, plants continuously form organs via pluripotent stem cells contained within the meristem. Flowering plants have an indeterminate meristem in their diploid generation, whereas the common ancestor of land plants is inferred to have formed an indeterminate meristem in its haploid generation, as observed in the extant basal land plants, bryophytes, including mosses. It is hypothesized that the underlying gene networks for the diploid meristem were initially present in the haploid generation of the basal land plants and were eventually co‐opted for expression in the diploid generation. In flowering plants, the class 1 KNOTTED1‐LIKE HOMEOBOX (KNOX) transcription factors are essential for the function of the indeterminate apical meristem. Here, we show that the class 1 KNOX orthologs function in the diploid organ, with determinate growth in the moss Physcomitrella patens, but do not function in the haploid indeterminate meristem. We propose that the genetic networks governing the indeterminate meristem in land plants are variable, and the networks governing the diploid indeterminate meristem with the class 1 KNOX genes likely evolved de novo in the flowering plant lineage.

Journal

Evolution and DevelopmentWiley

Published: Sep 1, 2008

References

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