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A revision of Martin's seed classification system, with particular reference to his dwarf-seed type

  • Carol C. Baskin (a1) (a2) and Jerry M. Baskin (a1)

Martin's (1946) seed classification system has 10 types based on embryo and endosperm characteristics and two additional types based on seed size: dwarf (0.3–2.0 mm) and micro ( ≤ 0.2 mm). He listed 17 families and 12 genera (in five other families) as having dwarf seeds. Our recent discovery of morphophysiological dormancy in dwarf seeds of several taxa of Campanulaceae and one of Gentianaceae prompted an evaluation of dwarf seeds. Martin's paper contains 37 families with one to several small (0.3–2.0 mm) seeded species that he did not list as being dwarf. Comparison of Martin's dwarf families and the 37 small-seeded non-dwarf families revealed no consistent differences between the two groups in endosperm texture, seed-coat anatomy, embryo morphology, class of seed dormancy or phylogenetic position. Also, Martin's dwarf seeds include a variety of embryo morphologies. Consequently, we have revised Martin's key to seed types. The dwarf category has been removed and the micro category replaced by ‘undifferentiated’ to reflect the state of the embryo in fresh seeds. Further, the key now includes linear fully developed, linear underdeveloped, spatulate fully developed and spatulate underdeveloped seed types, which Martin illustrated but did not include in his key. In the revised key, all seeds are distinguished on the basis of embryo and endosperm characteristics.

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APG II (Angiosperm Phylogeny Group) (2003) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141, 399436.

C.C. Baskin and J.M. Baskin (1998) Seeds: Ecology, biogeography, and evolution of dormancy and germination. San Diego, Academic Press.

C.C. Baskin and J.M. Baskin (2005) Underdeveloped embryos in dwarf seeds and implications for assignment to dormancy class. Seed Science Research 15, 357360.

C.C. Baskin , S.E. Meyer and J.M. Baskin (1995) Two types of morphophysiological dormancy in seeds of two genera (Osmorhiza and Erythronium) with an Arcto-Tertiary distribution pattern. American Journal of Botany 82, 293298.

C.C. Baskin , P. Milberg , L. Andersson and J.M. Baskin (2002) Non-deep simple morphophysiological dormancy in seeds of the weedy facultative winter annual Papaver rhoeas. Weed Research 42, 194202.

C.C. Baskin , J.M. Baskin and A. Yoshinaga (2005) Morphophysiological dormancy in seeds of six endemic lobelioid shrubs (Campanulaceae) from the montane zone in Hawaii. Canadian Journal of Botany 83, 16301637.

J.M. Baskin and C.C. Baskin (1984) Germination ecophysiology of an eastern deciduous forest herb, Stylophorum diphyllum. The American Midland Naturalist 111, 390399.

J.M. Baskin and C.C. Baskin (1994) Nondeep simple morphophysiological dormancy in seeds of the mesic woodland winter annual Corydalis flavula (Fumariaceae). Bulletin of the Torrey Botanical Club 121, 4046.

J.M. Baskin and C.C. Baskin (2004) A classification system for seed dormancy. Seed Science Research 14, 116.

J.M. Baskin , C.C. Baskin and X. Li (2000) Taxonomy, anatomy and evolution of physical dormancy in seeds. Plant Species Biology 15, 139152.

J.M. Baskin , C.C. Baskin and K.W. Dixon (2006) Physical dormancy in the endemic Australian genus Stylobasium, a first report for the family Surianaceae (Fabales). Seed Science Research 16, 229232.

F.D. Boesewinkel (1984) Ovule and seed structure in Datiscaceae. Acta Botanica Neerlandica 33, 419429.

R. Bregman and F. Bouman (1983) Seed germination in Cactaceae. Botanical Journal of the Linnean Society 86, 357374.

H. Coops and G. van der Velde (1995) Seed dispersal, germination and seedling growth of six helophyte species in relation to water-level zonation. Freshwater Biology 34, 1320.

E.A.A. da Silva , P.E. Toorop , A.C. van Aelst and H.W.M. Hilhorst (2004) Abscisic acid controls embryo growth potential and endosperm cap weakening during coffee (Coffea arabica cv. Rubi) seed germination. Planta 220, 251261.

A.M. Ellison (2001) Interspecific and intraspecific variation in seed size and germination requirements of Sarracenia (Sarraceniaceae). American Journal of Botany 88, 429437.

W.E. Finch-Savage and G. Leubner-Metzger (2006) Seed dormancy and the control of germination. New Phytologist 171, 501523.

T.A. Forbis and P.K. Diggle (2001) Subnivean embryo development in the alpine herb Caltha leptosepala (Ranunculaceae). Canadian Journal of Botany 79, 635642.

T.A. Forbis , S.K. Floyd and A. de Queiroz (2002) The evolution of embryo size in angiosperms and other seed plants: Implications for the evolution of seed dormancy. Evolution 56, 21122125.

D.G. Hewett (1964) Menyanthes trifoliata L. Journal of Ecology 52, 723735.

S.N. Hidayati , J.M. Baskin and C.C. Baskin (2000a) Dormancy-breaking and germination requirements for seeds of Diervilla lonicera (Caprifoliaceae), a species with underdeveloped linear embryos. Canadian Journal of Botany 78, 11991205.

S.N. Hidayati , J.M. Baskin and C.C. Baskin (2000b) Morphophysiological dormancy in seeds of two North American and one Eurasian species of Sambucus (Caprifoliaceae) with underdeveloped spatulate embryos. American Journal of Botany 87, 16691678.

S.N. Hidayati , J.M. Baskin and C.C. Baskin (2005) Epicotyl dormancy in Viburnum acerifolium (Caprifoliaceae). The American Midland Naturalist 153, 232244.

A. Horovitz , S. Bullowa and M. Negbi (1975) Germination characters in wild and cultivated Anemone coronaria L. Euphytica 24, 213220.

L.M. Karlsson , T. Tamado and P. Milberg (2003) Seed dormancy pattern of the annuals Argemone ochroleuca and A. mexicana (Papaveraceae). Flora 198, 329339.

T. Kondo , N. Okubo , T. Miura , C.C. Baskin and J.M. Baskin (2005) Ecophysiology of seed dormancy and germination in the mesic woodland herbaceous perennial Corydalis ambigua (Fumariaceae) in Japan. Canadian Journal of Botany 83, 571578.

T. Kondo , C. Sato , J.M. Baskin and C.C. Baskin (2006) Post-dispersal embryo development, germination phenology, and seed dormancy in Cardiocrinum cordatum var. glehnii (Liliaceae s. str.), a perennial herb of the broadleaved deciduous forest in Japan. American Journal of Botany 93, 849859.

A.C. Martin (1946) The comparative internal morphology of seeds. The American Midland Naturalist 36, 513660.

A.T. Moles , D.D. Ackerly , C.O. Webb , J.C. Tweddle , J.B. Dickie and M. Westoby (2005) A brief history of seed size. Science 307, 576580.

M.D. Morgan (1990) Seed germination characteristics of Iris virginica. The American Midland Naturalist 124, 209213.

M.G. Nikolaeva (2004) On criteria to use in studies of seed evolution. Seed Science Research 14, 315320.

V.L. Scatena and F. Bouman (2001) Embryology and seed development of Paepalanthus sect. Actinocephalus (Koern.) Ruhland (Eriocaulaceae). Plant Biology 3, 341350.

B. Shipley and M. Parent (1991) Germination responses of 64 wetland species in relation to seed size, minimum time to reproduction and seedling relative growth rate. Functional Ecology 5, 111118.

S.A. Spongberg (1978) The genera of Crassulaceae in the southeastern United States. Journal of the Arnold Arboretum 59, 197244.

J.L. Walck , C.C. Baskin and J.M. Baskin (1999) Seeds of Thalictrum mirabile (Ranunculaceae) require cold stratification for loss of nondeep simple morphophysiological dormancy. Canadian Journal of Botany 77, 17691776.

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Seed Science Research
  • ISSN: 0960-2585
  • EISSN: 1475-2735
  • URL: /core/journals/seed-science-research
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