Cytological and reproductive studies on Japanese Diplazium (Woodsiaceae; Pteridophyta):: Apomictic reproduction in Diplazium with evergreen bi- to tripinnate leaves

被引:15
作者
Takamiya, M
Takaoka, C
Ohta, N
机构
[1] Kumamoto Univ, Fac Sci, Dept Environm Sci, Kumamoto 8608555, Japan
[2] Kumamoto Univ, Fac Sci, Dept Biol Sci, Kumamoto 8608555, Japan
[3] Kumamoto Univ, Grad Sch Sci & Technol, Dept Environm Sci, Kumamoto 8608555, Japan
关键词
apogamy; apomixis; chromosome; Diplazium; hybrid; Woodsiaceae;
D O I
10.1007/PL00013897
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Mitotic and meiotic chromosomes were examined in a total of 162 plants representing 16 taxa in the Japanese Diplazium, including polymorphic terrestrial species with evergreen bi- to tripinnate leaves. Diplazium hachijoense, D. virescens var. virescens, var. conterminum, var. okina waense, and two other unnamed varieties, D, kawakamii var, kawakamii, D, dilatatum var. heterolepia, D. taiwanense, D. x kawabatae (=D. dilatatum X taiwanense), D,X takii (=D, hachijoense x virescens var. virescens), and D. x nakamurae (=D, hachijoense X virescens var. conterminum) are apomictic triploids (2n=n=123), Diplazium amamianum and D. esculentum are sexual diploids (2n= 82, n=41) and D, subtripinnatum is a sexual tetraploid (2n=164,n=82), Diplazium dilatatum var. dilatatum includes both sexual diploid and apomictic triploid populations. Cultivated gametophytes of six triploid taxa produced sporophytes apogamously, confirming their apomictic reproduction. All three putative hybrids, D.Xkawabatae, D.xtakii, and D.Xnakamurae, are triploid, apomictic, and fertile taxa, therefore they are not the result of hybridization between known pairs of Japanese Diplazium plants.
引用
收藏
页码:419 / 436
页数:18
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