Challenging the paradigms of leaf evolution : Class III HD-Zips in ferns and lycophytes

© 2016 The Authors. New Phytologist © 2016 New Phytologist Trust.

Bibliographische Detailangaben
Veröffentlicht in:The New phytologist. - 1979. - 212(2016), 3 vom: 06. Nov., Seite 745-758
1. Verfasser: Vasco, Alejandra (VerfasserIn)
Weitere Verfasser: Smalls, Tynisha L, Graham, Sean W, Cooper, Endymion D, Wong, Gane Ka-Shu, Stevenson, Dennis W, Moran, Robbin C, Ambrose, Barbara A
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2016
Zugriff auf das übergeordnete Werk:The New phytologist
Schlagworte:Journal Article Class III HD-Zip enation theory leaf evolution and development megaphyll microphyll sterilization theory telome theory Homeodomain Proteins Plant Proteins
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520 |a © 2016 The Authors. New Phytologist © 2016 New Phytologist Trust. 
520 |a Despite the extraordinary significance leaves have for life on Earth, their origin and development remain vigorously debated. More than a century of paleobotanical, morphological, and phylogenetic research has still not resolved fundamental questions about leaves. Developmental genetic data are sparse in ferns, and comparative studies of lycophytes and seed plants have reached opposing conclusions on the conservation of a leaf developmental program. We performed phylogenetic and expression analyses of a leaf developmental regulator (Class III HD-Zip genes; C3HDZs) spanning lycophytes and ferns. We show that a duplication and neofunctionalization of C3HDZs probably occurred in the ancestor of euphyllophytes, and that there is a common leaf developmental mechanism conserved between ferns and seed plants. We show C3HDZ expression in lycophyte and fern sporangia and show that C3HDZs have conserved expression patterns during initiation of lateral primordia (leaves or sporangia). This expression is maintained throughout sporangium development in lycophytes and ferns and indicates an ancestral role of C3HDZs in sporangium development. We hypothesize that there is a deep homology of all leaves and that a sporangium-specific developmental program was coopted independently for the development of lycophyte and euphyllophyte leaves. This provides molecular genetic support for a paradigm shift in theories of lycophyte leaf evolution 
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650 4 |a sterilization theory 
650 4 |a telome theory 
650 7 |a Homeodomain Proteins  |2 NLM 
650 7 |a Plant Proteins  |2 NLM 
700 1 |a Smalls, Tynisha L  |e verfasserin  |4 aut 
700 1 |a Graham, Sean W  |e verfasserin  |4 aut 
700 1 |a Cooper, Endymion D  |e verfasserin  |4 aut 
700 1 |a Wong, Gane Ka-Shu  |e verfasserin  |4 aut 
700 1 |a Stevenson, Dennis W  |e verfasserin  |4 aut 
700 1 |a Moran, Robbin C  |e verfasserin  |4 aut 
700 1 |a Ambrose, Barbara A  |e verfasserin  |4 aut 
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