Tetraploids from diploid * tetraploid crosses of Citrus using sweet oranges as seed parents.

概要

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Four diploid cultivars of sweet oranges (Citrus sinensis (L.) Obseck) were crossed with four tetraploid cultivars and the ploidy levels of the mature embryos from the fully developed seeds were analyzed immediately after germination. Seed set was affected primarily by the seed parents. The mean percentage of fully developed seeds was 55.6, 32.5, 14.0 and 13.1% in "Mediterranean Sweet", "Kanton orange", "Joppa"and "Fukuhara orange", respectively. The germinative embryos from the seeds of "Mediterranean Sweet"and "Kanton orange"consisted of tetraploids and diploids, but those from the seeds of "Joppa"and "Fukuhara orange"were all diploids. The proportions of the seeds wlth tetraploid embryos among fully developed seeds were more or less constant when crosses were made using different pollen parents, the average being 80.5% in "Medlterranean Sweet"and 69.8% in "Kanton orange". The germinative diploid embryos were also contained in 57.1 and 67.1% seeds with tetraploid embryos from "Mediterranean Sweet"ana "Kanton orange", respectively.
日本育種学会の論文