TY - JOUR
T1 - Building new insights in plant gametogenesis from an evolutionary perspective
AU - Hisanaga, Tetsuya
AU - Yamaoka, Shohei
AU - Kawashima, Tomokazu
AU - Higo, Asuka
AU - Nakajima, Keiji
AU - Araki, Takashi
AU - Kohchi, Takayuki
AU - Berger, Frédéric
N1 - Publisher Copyright:
© 2019, Springer Nature Limited.
PY - 2019/7/1
Y1 - 2019/7/1
N2 - Extant bryophytes are thought to preserve characteristics of ancestral land plants, with a life cycle dominated by the haploid gametophyte. The gametophyte produces gametes in specialized organs that differentiate after an extensive phase of vegetative development. During land plant evolution, these organs became extremely reduced. As a result, in flowers of angiosperms the haploid phase of the life cycle is reduced to few-celled gametophytes, namely the embryo sac (female) and pollen (male). Although many factors contributing to gametogenesis have been identified in flowering plants, the extreme reduction of the gametophytes has prevented a clear molecular dissection of key processes of gametogenesis. Recent studies in the model bryophyte Marchantia polymorpha have identified conserved transcription factors regulating the equivalent steps in the sexual reproduction of land plants. These include FEMALE GAMETOPHYTE MYB for female gametophyte development, BONOBO for gamete progenitor cell specification, DUO POLLEN1 for sperm differentiation and members of the RWP-RK domain family for female gamete formation. These studies demonstrate that M.polymorpha is a powerful model to untangle the core processes of gametogenesis in land plants. We anticipate that a deeper understanding of gametogenesis in bryophytes will circumscribe the origin of plant germ cells and define the differentiation programmes of sperm and eggs.
AB - Extant bryophytes are thought to preserve characteristics of ancestral land plants, with a life cycle dominated by the haploid gametophyte. The gametophyte produces gametes in specialized organs that differentiate after an extensive phase of vegetative development. During land plant evolution, these organs became extremely reduced. As a result, in flowers of angiosperms the haploid phase of the life cycle is reduced to few-celled gametophytes, namely the embryo sac (female) and pollen (male). Although many factors contributing to gametogenesis have been identified in flowering plants, the extreme reduction of the gametophytes has prevented a clear molecular dissection of key processes of gametogenesis. Recent studies in the model bryophyte Marchantia polymorpha have identified conserved transcription factors regulating the equivalent steps in the sexual reproduction of land plants. These include FEMALE GAMETOPHYTE MYB for female gametophyte development, BONOBO for gamete progenitor cell specification, DUO POLLEN1 for sperm differentiation and members of the RWP-RK domain family for female gamete formation. These studies demonstrate that M.polymorpha is a powerful model to untangle the core processes of gametogenesis in land plants. We anticipate that a deeper understanding of gametogenesis in bryophytes will circumscribe the origin of plant germ cells and define the differentiation programmes of sperm and eggs.
UR - http://www.scopus.com/inward/record.url?scp=85068793306&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85068793306&partnerID=8YFLogxK
U2 - 10.1038/s41477-019-0466-0
DO - 10.1038/s41477-019-0466-0
M3 - Review article
C2 - 31285561
AN - SCOPUS:85068793306
SN - 2055-026X
VL - 5
SP - 663
EP - 669
JO - Nature Plants
JF - Nature Plants
IS - 7
ER -