Seed fertilization, development, and germination in Hydatellaceae (Nymphaeales): Implications for endosperm evolution in early angiosperms
| Autor: | Margarita V. Remizowa, Margaret M. Ramsay, Renee E. Tuckett, Margaret E. Collinson, Selena Y. Smith, Julia Tratt, Paula J. Rudall, Dmitry D. Sokoloff, Tilly Eldridge |
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| Rok vydání: | 2011 |
| Předmět: |
angiosperm evolution
PHYLOGENY embryo Research Groups and Centres\Earth Sciences\Ancient and Modern Earth Systems Trithuria Plant Science SYSTEMATICS Hydatellaceae BASAL ANGIOSPERMS Endosperm endosperm Double fertilization Nymphaeales Research Groups and Centres\Earth Sciences\Geochemistry Haustorium synchrotron Botany Faculty of Science\Earth Sciences Genetics Ecology Evolution Behavior and Systematics ILLICIUM ILLICIACEAE biology FLOWERING PLANTS ORIGIN waterlilies biology.organism_classification FEMALE GAMETOPHYTE Research Groups and Centres\Earth Sciences\Plant Paleobiology AMBORELLA WATER LILIES Germination AUSTROBAILEYALES seed development Primary endosperm nucleus |
| Zdroj: | American Journal of Botany, 96 (9) |
| ISSN: | 0002-9122 |
| Popis: | New data on endosperm development in the early-divergent angiosperm Trithuria (Hydatellaceae) indicate that double fertilization results in formation of cellularized micropylar and unicellular chalazal domains with contrasting ontogenetic trajectories, as in waterlilies. The micropylar domain ultimately forms the cellular endosperm in the dispersed seed. The chalazal domain forms a single-celled haustorium with a large nucleus;, this haustorium ultimately degenerates to form a space in the dispersed seed, similar to the chalazal endosperm haustorium of waterlilies. The endosperm condition in Trithuria and waterlilies resembles the helobial condition that characterizes some monocots, but contrasts with Amborella and Illicium, in which most of the mature endosperm is formed from the chalazal domain. The precise location of the primary endosperm nucleus governs the relative sizes of the chalazal and micropylar domains, but not their subsequent developmental trajectories. The unusual tissue layer surrounding the bilobed cotyledonary sheath in seedlings of some species of Trithuria is a belt of persistent endosperm, comparable with that of some other early-divergent angiosperms with a well-developed perisperm, such as Saururaceae and Piperaceae. The endosperm of Trithuria is limited in size and storage capacity but relatively persistent. |
| Databáze: | OpenAIRE |
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