Unreduced spore formation in a spontaneous chimeric pinnule in an artificially produced haploid Anisocampium niponicum (Athyriaceae, Polypodiales).
J Plant Res
; 137(2): 161-165, 2024 Mar.
Article
en En
| MEDLINE
| ID: mdl-38194203
ABSTRACT
Haploid sporophytes of Anisocampium niponicum with 2n = 40, were produced artificially by induced apogamy in vitro. They were subsequently transplanted into pots and two of them have been cultivated for the investigation of sporogenesis and/or production of chimera for more than 20 years. Haploid A. niponicum is sterile, but an abnormal chimeric pinnule that developed spontaneously in a single frond produced sporangia with spores. Each sporangium bore approximately 32 spores that were almost uniform in size. Sowing of these spores resulted in 50 gametophytes. Of 20 gametophytes cultured individually, five produced sporophytes apogamously after eight months. Both the gametophytes and subsequent apogamous sporophytes showed a chromosome number of 2n = 40. Our study demonstrates that a haploid sporophyte offspring can be produced from a haploid mother sporophyte via haploid spores. Since asexual reproduction is a prominent evolutionary process in ferns, the reproduction of a haploid A. niponicum sporophyte by unreduced spore formation might help to elucidate how apogamous ferns occur and evolve.
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Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Helechos
Idioma:
En
Revista:
J Plant Res
Asunto de la revista:
BOTANICA
Año:
2024
Tipo del documento:
Article
País de afiliación:
Japón