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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Sokoloff, Dmitry D. Remizowa, Margarita V. Macfarlane, Terry D. Tuckett, Renee E. Ramsay, Margaret M. Beer, Anton S. Yadav, Shrirang R. Rudall, Paula J. |
Description | Country affiliation: RUSSIA Author Affiliation: Sokoloff DD ( Biological Faculty, Moscow State University, 119991 Moscow, Russia.) |
Abstract | BACKGROUND AND AIMS: Cotyledon number has long been a primary morphological feature distinguishing monocots from other angiosperms. Recent placement of Hydatellaceae near the early-divergent angiosperm order Nymphaeales, rather than in the monocot order Poales, has prompted reassessment of seedling morphology in this poorly known family. METHODS: Seedlings of six species representing all eco-geographical groups of Hydatellaceae are described using light and scanning electron microscopy. KEY RESULTS: Two seedling types were discovered. Material examined of Trithuria submersa, T. bibracteata, T. austinensis and T. filamentosa possess a transparent bilobed sheathing structure that surrounds the main axis below the first foliage leaf. The seed coat is attached to the sheathing structure. Seedlings of Trithuria lanterna and T. konkanensis lack a sheathing structure, and the seed coat is attached to a short, narrow lateral outgrowth on the main axis of the seedling. CONCLUSIONS: The sheathing structure that is present in seedlings of some Hydatellaceae could be homologized with the two united cotyledons of water lilies. It also resembles the single cotyledon of some monocots, and hence demonstrates a possible pathway of the origin of a monocot-like embryo, though no homology is implied. The sheathing structure is reduced in Trithuria lanterna and T. konkanensis, and the short, narrow outgrowth of its seedling could represent a single cotyledon. This synapomorphy suggests that the only Indian species of Hydatellaceae, T. konkanensis, is closer to the northern Australian T. lanterna than to the south-western Australian T. bibracteata. |
File Format | HTM / HTML |
ISSN | 03057364 |
e-ISSN | 10958290 |
Journal | Annals of Botany |
Issue Number | 1 |
Volume Number | 101 |
Language | English |
Publisher | Oxford University Press |
Publisher Date | 2008-01-01 |
Publisher Place | Great Britain (UK) |
Access Restriction | Open |
Subject Keyword | Research Support, Non-u.s. Gov't Microscopy, Electron, Scanning Cotyledon Seedling Comparative Study Discipline Botany Biological Evolution Growth & Development Plant Roots Ultrastructure Classification Angiosperms |
Content Type | Text |
Resource Type | Article |
Subject | Plant Science |
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