ArticleAnnals of botany2008
Comparative ovule and megagametophyte development in Hydatellaceae and water lilies reveal a mosaic of features among the earliest angiosperms.
Article in Annals of botany, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
22 citing papers in PubMed, 72 citations in OpenAlex.
- Basis of apomixis in flowering plants - state of the art and research perspectives.Plant reproduction · 2026Review
- Imprinting and DNA Methylation in Water Lily Endosperm: Implications for Seed Evolution.Molecular biology and evolution · 2025Article
- Endosperm Development Traits in a Comparative Analysis of Endospermogenesis and Embryogenesis in Angiosperms.Doklady biological sciences : proceedings of the Academy of Sciences of the USSR, Biological sciences sections · 2022Article
- The embryological insight into the relationship between Forsythia and Abeliophyllum (Forsythieae, Oleaceae).Journal of plant research · 2020Article
- Review
- Embryology inPlants (Basel, Switzerland) · 2019Article
- Transcriptomics of manually isolated Amborella trichopoda egg apparatus cells.Plant reproduction · 2019Article
- Natural Variation in Ovule Morphology Is Influenced by Multiple Tissues and Impacts Downstream Grain Development in Barley (Frontiers in plant science · 2019Article
- Molecular breeding of water lily: engineering cold stress tolerance into tropical water lily.Horticulture research · 2018Article
- Cytological analysis of ginseng carpel development.Protoplasma · 2017Article
- Floral biology and ovule and seed ontogeny of Nymphaea thermarum, a water lily at the brink of extinction with potential as a model system for basal angiosperms.Annals of botany · 2015Article
- Reconstructing the age and historical biogeography of the ancient flowering-plant family Hydatellaceae (Nymphaeales).BMC evolutionary biology · 2014Article
- Immunolocalization of arabinogalactan proteins (AGPs) in reproductive structures of an early-divergent angiosperm, Trithuria (Hydatellaceae).Annals of botany · 2013Article
- Pollen tube development in two species of Trithuria (Hydatellaceae) with contrasting breeding systems.Sexual plant reproduction · 2012Article
- Unique stigmatic hairs and pollen-tube growth within the stigmatic cell wall in the early-divergent angiosperm family Hydatellaceae.Annals of botany · 2011Article
- Female gamete competition in an ancient angiosperm lineage.Proceedings of the National Academy of Sciences of the United States of America · 2011Article
- Angiosperm ovules: diversity, development, evolution.Annals of botany · 2011Review
- Reproductive ecology of the basal angiosperm Trithuria submersa (Hydatellaceae).Annals of botany · 2010Article
- A new type of specialized morphophysiological dormancy and seed storage behaviour in Hydatellaceae, an early-divergent angiosperm family.Annals of botany · 2010Article
- Defining the limits of flowers: the challenge of distinguishing between the evolutionary products of simple versus compound strobili.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2010Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors at 5 institutions in 5 countries.
Funding
Abstract
BACKGROUND AND
aimsThe embryo sac, nucellus and integuments of the early-divergent angiosperms Hydatellaceae and other Nymphaeales are compared with those of other seed plants, in order to evaluate the evolutionary origin of these characters in the angiosperms.
methodsUsing light microscopy, ovule and embryo sac development are described in five (of 12) species of Trithuria, the sole genus of Hydatellaceae, and compared with those of Cabombaceae and Nymphaeaceae. KEY
resultsThe ovule of Trithuria is bitegmic and tenuinucellate, rather than bitegmic and crassinucellate as in most other Nymphaeales. The seed is operculate and possesses a perisperm that develops precociously, which are both key features of Nymphaeales. However, in the Indian species T. konkanensis, perisperm is relatively poorly developed by the time of fertilization. Perisperm cells in Trithuria become multinucleate during development, a feature observed also in other Nymphaeales. The outer integument is semi-annular ('hood-shaped'), as in Cabombaceae and some Nymphaeaceae, in contrast to the annular ('cap-shaped') outer integument of some other Nymphaeaceae (e.g. Barclaya) and Amborella. The megagametophyte in Trithuria is monosporic and four-nucleate; at the two-nucleate stage both nuclei occur in the micropylar domain. Double megagametophytes were frequently observed, probably developed from different megaspores of the same tetrad. Indirect, but strong evidence is presented for apomictic embryo development in T. filamentosa.
conclusionsMost features of the ovule and embryo sac of Trithuria are consistent with a close relationship with other Nymphaeales, especially Cabombaceae. The frequent occurrence of double megagametophytes in the same ovule indicates a high degree of developmental flexibility, and could provide a clue to the evolutionary origin of the Polygonum-type of angiosperm embryo sac.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.