Morphology of the seed coat of Oxalis spp. from Buenos Aires Province (Argentina)
The aim of the present study is to provide detailed morphological descriptions of the seed coat in 10 species of Oxalis from Buenos Aires Province, Argentina, using light microscopy and scanning electron microscopy. The seed is ovate and brown, and its surface is smooth. Oxalis has a mechanism of spermobolia by which a part of the seed coat is detached by the rupture of cells, leaving exposed a layer of opened cells, generally with oxalate crystals. This new coat surface has different characteristics in the species studied in this work. Three types are recognized, mostly on the basis of anatomical and ultrastructural characteristics of the seed coat. The species grouped in each of the 3 types of seeds belong to different sections of the genus; thus, the seed morphology could be of taxonomic value for the genus Oxalis.
Morphology of the seed coat of Oxalis spp. from Buenos Aires Province (Argentina)
The aim of the present study is to provide detailed morphological descriptions of the seed coat in 10 species of Oxalis from Buenos Aires Province, Argentina, using light microscopy and scanning electron microscopy. The seed is ovate and brown, and its surface is smooth. Oxalis has a mechanism of spermobolia by which a part of the seed coat is detached by the rupture of cells, leaving exposed a layer of opened cells, generally with oxalate crystals. This new coat surface has different characteristics in the species studied in this work. Three types are recognized, mostly on the basis of anatomical and ultrastructural characteristics of the seed coat. The species grouped in each of the 3 types of seeds belong to different sections of the genus; thus, the seed morphology could be of taxonomic value for the genus Oxalis.
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- Akbari RS, Azizian D (2006). Seed morphology and seed coat sculpturing of Epilobium L. species (Onagraceae Juss.) from Iran. Turk J Bot 30: 435–440.
- Bahadur B, Vyaya Bhaskar K, Earooqui SM (1983). LM and SEM studies of seed coat in five species of Oxalis L. (Oxalidaceae). Proc Indian Natl Sci Acad B 49: 348–353.
- Barthlott W (1981). Epidermal and seed surface characters of plants: systematic applicability and some evolutionary aspects. Nord J Bot 1: 345–55.
- Barthlott W (1984). Microstructural features of seed surface. In: Heywood VH, Moore DM, editors. Current Concepts in Plant Taxonomy. London, UK: Academic Press.
- Boesewinkel FD (1988). The seed structure and taxonomic relationship of Hyscocharis Remy. Acta Bot Neerl 37: 111–120.
- Boesewinkel FD, Bouman F (1984). The seed: structure. In: Johri BM, editor. Embryology of Angiosperms. Berlin, Germany: Springer-Verlag, pp. 567–610.
- Bona M (2013). Seed-coat microsculpturing of Turkish Lepidium (Brassicaceae) and its systematic application. Turk J Bot 37: 662–668.
- Bouman F (1974). Developmental Studies of the Ovule, Integuments, and Seed in Some Angiosperms. Amsterdam, the Netherlands: University of Amsterdam Press.
- Corner EJH (1976). The Seeds of Dicotyledons. Cambridge, UK: Cambridge University Press.
- FagşndezJ, Izco J (2011). Seed morphology and anatomy of the Mediterranean pentamerous species of Erica (Ericaceae). Turk J Bot 35: 643–651.
- Gardner AG, Vaio M, Guerra M, Emshwiller E (2012). Diversification of the American bulb-bearing Oxalis (Oxalidaceae): dispersal to North America and modification of the tristylous breeding system. Am J Bot 99: 152–164.
- Jensen WA (1962). Botanical Histochemistry: Principles and Practice. San Francisco, CA, USA: Freeman.
- Kumar P, Singh D (1990). Development and structure of seed coat in Hibiscus. Phytomorphology 40: 179–188.
- Lourteig A (2000). Oxalis L. subgéneros Monoxalis (Small) Lourt., Oxalis y Trifidus Lourt. Bradea 7: 201–629 (in Portuguese).
- Mostafavi G, Assadi M, Nejadsattari T, Sharifnia F, Mehregan I (2013). Seed micromorphological survey of the Minuartia species (Caryophyllaceae) in Iran. Turk J Bot 37: 446–454.
- Oberlander KC, Dreyer LL, Bellstedt DU (2011). Molecular phylogenetics and origins of southern African Oxalis. Taxon 60: 1667–1677.
- Pearse AGE (1961). Histochemistry: Theoretical and Applied. 2nd ed. Boston, MA, USA: Little, Brown & Co.
- Periasamy K (1962). The ruminate endosperm: development and type of rumination. In: Plant Embryology: A Symposium. New Delhi, India: CSIR, pp. 62–74.
- Schoenberg MM (1985). Um novo mecanismo de espermobolia em Oxalis paludosa St. Hill. Acta Biol Parana 14: 125–150 (in Portuguese).
- Takahashi H (1993). Seed morphology and its systematic implications in Pyroloideae (Ericaceae). Int J Plant Sci 154: 175–186.
- Werker E (1997). Seed anatomy. In: Carlquist S, Cutler DR, Fink S, Ozenda P, Roth I, Ziegler H, editors. Encyclopedia of Plant Anatomy, Vol. 10. Berlin, Germany: Gebrüder Borntraeger.