Vol. 81 No: 6

Title:
Interspecific hybrid production by reciprocal crosses between Dianthus caryophyllus L. and Dianthus × isensis Hirahata et Kitamura

Authors:
M. NIMURA, J. KATO and M. MII

pp: 995-1001

Abstract:
To introduce the characters of extremely early flowering and unique flower shape of Dianthus × isensis Hirahata et Kitamura into Dianthus caryophyllus L., reciprocal interspecific crosses were carried out between seven lines of D. caryophyllus and one line of D. × isensis.When D. caryophyllus was used as the maternal parent, 79 progeny were obtained from only four lines of D. caryophyllus. Flow cytometric analysis revealed that they consisted of 30 diploid hybrid plants and 49 diploid maternal-type progeny.When D. × isensis was used as the maternal parent, five progeny including three diploid hybrids, one triploid hybrid and one maternal-type were obtained by pollination with only two lines of D. caryophyllus. The ploidy level of these hybrids was confirmed by counting chromosome numbers in roottip cells. Flow cytometric analysis also revealed that the triploid hybrid had two genomes of D. × isensis and one genome of D. caryophyllus, suggesting that D. × isensis had produced an unreduced female gamete. Since the diploid interspecific hybrids were fertile and have some of the profitable characters of D.× isensis such as early flowering and a unique flower shape, they are expected to be used for future breeding in carnation.

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