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MADS-box genes active in developing pollen cones of Norway spruce (Picea abies) are homologous to the B-class floral homeotic genes in angiosperms
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Physiological Botany.
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1999 (English)In: Developmental Genetics, ISSN 0192-253X, E-ISSN 1520-6408, Vol. 25, no 3, 253-266 p.Article in journal (Refereed) Published
Abstract [en]

The reproductive organs of conifers, the pollen cones and seed cones, differ in morphology from the angiosperm flower in several fundamental respects. In this report we present evidence to suggest that the two plant groups, in spite of these morphological differences and the long evolutionary distance between them, share important features in regulating the development of the reproductive organs. We present the cloning of three genes, DAL11, DAL12, and DAL13, from Norway spruce, all of which are related to the angiosperm B-class of homeotic genes. The B-class genes determine the identities of petals and stamens. They are members of a family of MADS-box genes, which also includes C-class genes that act to determine the identity of carpels and, in concert with B genes specify stamens in the angiosperm flower. Phylogenetic analyses and the presence of B-class specific C-terminal motifs in the DAL protein sequences imply homology to the B-class genes. Specific expression of all three genes in developing pollen cones suggests that the genes are involved in one aspect of B function, the regulation of development of the pollen-bearing organs. The different temporal and spatial expression patterns of the three DAL genes in the developing pollen cones indicate that the genes have attained at least in part distinct functions. The DAL11, DAL12, and 13 expression patterns in the pollen cone partly overlap with that of the previously identified DAL2 gene, which is structurally and functionally related to the angiosperm C-class genes. This result supports the hypothesis that an interaction between B- and C-type genes is required for male organ development in conifers like in the angiosperms. Taken together, our data suggests that central components in the regulatory mechanisms for reproductive organ development are conserved between conifers and angiosperms and, thus, among all seed plants.

Place, publisher, year, edition, pages
1999. Vol. 25, no 3, 253-266 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-89833DOI: 10.1002/(SICI)1520-6408(1999)25:3<253::AID-DVG8>3.0.CO;2-PPubMedID: 10528266OAI: oai:DiVA.org:uu-89833DiVA: diva2:161638
Note

De två första författarna delar förstaförfattarskapet.

Available from: 2002-04-29 Created: 2002-04-29 Last updated: 2015-06-16Bibliographically approved
In thesis
1. MADS-Box Gene Phylogeny and the Evolution of Plant Form: Characterisation of a Family of Regulators of Reproductive Development from the Conifer Norway Spruce, Picea abies
Open this publication in new window or tab >>MADS-Box Gene Phylogeny and the Evolution of Plant Form: Characterisation of a Family of Regulators of Reproductive Development from the Conifer Norway Spruce, Picea abies
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The evolutionary relationships between the angiosperm floral organs and the reproductive organs of other seed plants is not known. Flower organ development requires transcription factors encoded by the MADS-box genes. Since the evolution of novel morphology likely involve changes in developmental regulators, I have analysed MADS-box genes from the conifer Norway spruce, Picea abies, a representative of the gymnosperm group of seed plants.

The results show that the MADS-box gene family has evolved via gene duplications and subsequent diversifications in correlation in time with the evolution of morphological novelties along the seed-plant lineage.

Angiosperm MADS-box genes that determine petal and stamen development have homologues in the conifers, that are specifically active in pollen cones. It is, therefore, likely that the common ancestor of these genes controlled the development of the pollen-bearing organs in the early seed plants, and later were recruited for petal development in the angiosperms.

Norway spruce set cones at an age of 15-20 years. One of the spruce MADS-box genes analysed may have a function in the control of the transition to reproductive phase, supported by expression data and the effect of the gene on development of transgenic Arabidopsis plants.

Two of the spruce genes identified are not closely related to any known angiosperm gene. These may have roles in gymnosperm-specific developmental processes, possibly in the patterning of the conifer cones, as suggested by their expression patterns.

The molecular regulation of cone- and flower development in fundamental aspects is highly conserved between conifers and angiosperms, however, differences detected may be informative regarding the origin of morphological complexity.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 46 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 718
Keyword
Plant physiology, Växtfysiologi
National Category
Botany
Research subject
Physiological Botany
Identifiers
urn:nbn:se:uu:diva-2020 (URN)91-554-5326-0 (ISBN)
Public defence
2002-05-24, the lecture hall at the department of physiological botany, EBC, Uppsala University, Uppsala, 13:00
Opponent
Available from: 2002-04-29 Created: 2002-04-29 Last updated: 2016-04-26Bibliographically approved

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Carlsbecker, AnnelieSvenson, MarieEngström, Peter

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