Reproductive biology of the fernPhegopteris decursive-pinnata |
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Authors: | Shigeo Masuyama |
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Institution: | (1) Junior College, Tokyo Woman's Christian University, Mure 4, 181 Mitaka, Tokyo |
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Abstract: | Four diploid plants and four tetraploid plants ofPhegopteris decursive-pinnata were investigated for determination of the reproductive characteristics of their gametophytes and two major features were
recognized. First, gametophytes of the diploids showed an ontogenetic sequence of gametangium formation which is unfavorable
for intragametophytic selfing, whereas those of the tetraploids showed that favorable for intragametophytic selfing. Second,
41 to 72% of the isolated gametophytes of the diploids produced sporophytes in the intragmetophytic selfing tests, whereas
all of the isolated gametrophytes of the tetraploids produced sporophytes in the tests. Based on these developmental and genetic
features of gametophytes, the dissimilar mating systems of the diploids and the tetraploids of this species are discussed. |
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