ArticleAnnals of botany2017
The morphophysiological dormancy in Amborella trichopoda seeds is a pleisiomorphic trait in angiosperms.
Article in Annals of botany, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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8 citing papers in PubMed, 14 citations in OpenAlex.
- The initiation of embryo growth in imbibed celery mericarps marks a key mechanism by which temperature signals are integrated to regulate germination timing.Journal of experimental botany · 2026Article
- The seed morphospace, a new contribution towards the multidimensional study of angiosperm sexual reproductive biology.Annals of botany · 2024Article
- Concluding Embryogenesis After Diaspora: Seed Germination in Illicium Parviflorum.Integrative and comparative biology · 2023Article
- Model Species to Investigate the Origin of Flowers.Methods in molecular biology (Clifton, N.J.) · 2023Article
- Morphophysiological dormancy in the basal angiosperm order Nymphaeales.Annals of botany · 2019Article
- Article
- Dioecy in Amborella trichopoda: evidence for genetically based sex determination and its consequences for inferences of the breeding system in early angiosperms.Annals of botany · 2017Article
- Article
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8 authors at 3 institutions in 3 countries.
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No grant is acknowledged in the PubMed record.
Abstract
Background and Aims: Recent parsimony-based reconstructions suggest that seeds of early angiosperms had either morphophysiological or physiological dormancy, with the former considered as more probable. The aim of this study was to determine the class of seed dormancy present in Amborella trichopoda , the sole living representative of the most basal angiosperm lineage Amborellales, with a view to resolving fully the class of dormancy present at the base of the angiosperm clade. Methods: Drupes of A. trichopoda without fleshy parts were germinated and dissected to observe their structure and embryo growth. Pre-treatments including acid scarification, gibberellin treatment and seed excision were tested to determine their influence on dormancy breakage and germination. Character-state mapping by maximum parsimony, incorporating data from the present work and published sources, was then used to determine the likely class of dormancy present in early angiosperms. Key Results: Germination in A. trichopoda requires a warm stratification period of at least approx. 90 d, which is followed by endosperm swelling, causing the water-permeable pericarp-mesocarp envelope to split open. The embryo then grows rapidly within the seed, to radicle emergence some 17 d later and cotyledon emergence after an additional 24 d. Gibberellin treatment, acid scarification and excision of seeds from the surrounding drupe tissues all promoted germination by shortening the initial phase of dormancy, prior to embryo growth. Conclusions: Seeds of A. trichopoda have non-deep simple morphophysiological dormancy, in which mechanical resistance of the pericarp-mesocarp envelope plays a key role in the initial physiological phase. Maximum parsimony analyses, including data obtained in the present work, indicate that morphophysiological dormancy is likely to be a pleisiomorphic trait in flowering plants. The significance of this conclusion for studies of early angiosperm evolution is discussed.
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