Reticulate evolution of the hybrid produced artificially by crosses between Osmunda banksiifolia and Osmunda lancea |
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| Authors: | Suzue M Kawakami Katsuhiko Kondo Shogo Kawakami |
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| Institution: | (1) Nishio Nursing College, Togasaki, Nishio Aichi, 445-0074, Japan;(2) 1-6-16 Shiratori, Togo-cho, Aichi-gun, Aichi 470-0155, Japan;(3) Faculty of Agriculture, Tokyo University of Agriculture, Funako, Atsugi Kanagawa, 243-0034, Japan;(4) Faculty of Education, Aichi University of Education, Igaya, Kariya Aichi, 448-8542, Japan |
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| Abstract: | Although ferns have been developed by hybridization and chromosome doubling, no natural polyploidy has yet been recorded in
Osmundaceae. So, we produced hybrids artificially by crosses between Osmunda banksiifolia (2n = 2x = 44) and Osmunda lancea (2n = 2x = 44), and investigated their sporogenesis. From the O. banksiifolia × O.
lancea hybrid with 44 univalent chromosomes, allotetraploids with 44 bivalent chromosomes were produced by chromosome doubling,
and allotriploids with 22 univalent chromosomes and 22 bivalent chromosomes were then produced by back crosses. The results
show when and how chromosome doubling occurs in hybrids. The success of artificial hybridization between O. banksiifolia and O. lancea, did not, however, reflect any product of natural hybridization between the two species. |
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