Natural history and taxonomy of Isoetes (Isoetaceae).
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Accession number;99A0923033
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| Title;Natural history and taxonomy of Isoetes (Isoetaceae). |
| Author;
TAKAMIYA MASAYUKI
(Kumamoto Univ., Fac. of Sci.)
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Journal Title;Shokubutsu Bunrui, Chiri
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Journal Code:L2614A
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ISSN:0001-6799
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VOL.50;NO.1;PAGE.101-138(1999)
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| Figure&Table&Reference;FIG.11, TBL.2, REF.240 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;On the basis of a review of earlier studies including those of the author, our current knowledge on morphology, palynology, reproduction mode, cytology and metabolism of the genus Isoetes (Isoetaceae; Pteridophyta) were summarized. Morphological and anatomical features of corms, roots, leaves, sporangia, mega- and microspores and spore germination, as well as their taxonomical values, were discussed. All chromosomal data available throughout the world show the presence of a polyploid series from 2x (2n=22) to 12x (2n=132) and eight species to have intraspecific polyploidies. Out of 81 taxa whose chromosome numbers were reported, 27 are diploids, 30 tetraploids, and 13 natural hybrids. Isoetes thus shows a reticulate evolution through hybridization and polyploidization. A variety of reproduction mode, i.e., sexual, apomictic and vegetative reproduction was explained. A diagnostic key to Japanese taxa comprising four species, one hybrid (Isoetes*michinokuana), and two varieties was also provided, and in addition phylogenetic relationships among them was discussed. (author abst.) |
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