ArticleAnnals of botany2011
Acquisition of physical dormancy and ontogeny of the micropyle--water-gap complex in developing seeds of Geranium carolinianum (Geraniaceae).
Article in Annals of botany, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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9 citing papers in PubMed, 49 citations in OpenAlex.
- Germination control by a hard seed coat: insights from a tropical legume.Scientific reports · 2025Article
- Effects of HFrontiers in plant science · 2023Article
- Unravelling the paradox in physically dormant species: elucidating the onset of dormancy after dispersal and dormancy-cycling.Annals of botany · 2022Article
- Suppression of GhGLU19 encoding β-1,3-glucanase promotes seed germination in cotton.BMC plant biology · 2022Article
- Seed development in Paeonia ostii (Paeoniaceae), with particular reference to embryogeny.BMC plant biology · 2021Article
- Mechanisms underpinning the onset of seed coat impermeability and dormancy-break in Astragalus adsurgens.Scientific reports · 2019Article
- A function for the pleurogram in physically dormant seeds.Annals of botany · 2019Article
- Identification and characterization of ten new water gaps in seeds and fruits with physical dormancy and classification of water-gap complexes.Annals of botany · 2013Article
- Seed ultrastructure and water absorption pathway of the root-parasitic plant Phelipanche aegyptiaca (Orobanchaceae).Annals of botany · 2012Article
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4 authors at 1 institution in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
BACKGROUND AND
aimsThe 'hinged valve gap' has been previously identified as the initial site of water entry (i.e. water gap) in physically dormant (PY) seeds of Geranium carolinianum (Geraniaceae). However, neither the ontogeny of the hinged valve gap nor acquisition of PY by seeds of Geraniaceae has been studied previously. The aims of the present study were to investigate the physiological events related to acquisition of PY and the ontogeny of the hinged valve gap and seed coat of G. carolinianum.
methodsSeeds of G. carolinianum were studied from the ovule stage until dispersal. The developmental stages of acquisition of germinability, physiological maturity and PY were determined by seed measurement, germination and imbibition experiments using intact seeds and isolated embryos of both fresh and slow-dried seeds. Ontogeny of the seed coat and water gap was studied using light microscopy. KEY
resultsDeveloping seeds achieved germinability, physiological maturity and PY on days 9, 14 and 20 after pollination (DAP), respectively. The critical moisture content of seeds on acquisition of PY was 11 %. Slow-drying caused the stage of acquisition of PY to shift from 20 to 13 DAP. Greater extent of cell division and differentiation at the micropyle, water gap and chalaza than at the rest of the seed coat resulted in particular anatomical features. Palisade and subpalisade cells of varying forms developed in these sites. A clear demarcation between the water gap and micropyle is not evident due to their close proximity.
conclusionsAcquisition of PY in seeds of G. carolinianum occurs after physiological maturity and is triggered by maturation drying. The micropyle and water gap cannot be considered as two separate entities, and thus it is more appropriate to consider them together as a 'micropyle--water-gap complex'.
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