Investigation of the morphological and cytogenetic variations of an intraspecific Asiatic lily hybrid using 5S and 18S rDNA probes
2020
Islam, Md Mazharul | Yesmin, Reshma | Jung, Min-Jung | Kim, Hong-yul | Kim, Chang-Kil | Lim, Ki-Byung
This study aimed to determine the morphological and cytogenetic differences in an intraspecific Asiatic F₁Lilium hybrid. The results indicated that leaf color and shape, flower morphology including color, spot size on petal, and filament color in the F₁ hybrid showed significant variations as compared to parents, while days to flowering were similar to those of the parents. Moreover, stem height, leaf number, and leaf width showed distinct variations. Interestingly, the intraspecific F₁ progeny obtained from Asiatic lily parents showed higher pollen viability. In addition, FISH results revealed significant variation in the number of 18S rDNA and 5S rDNA loci identified in both parents and the F₁ progeny. The female (2n = 4x = 48) parent had 12 loci of 18S rDNA, whereas the male (2n = 2x = 24) parent and the F₁ (2n = 3x = 36) had 8 and 11 loci of 18S rDNA, respectively. Moreover, the F₁ progeny had 9 loci of 5S rDNA compared with the 7 and 4 loci identified in the female and male parents, respectively. All 5S rDNA signals were observed on the long arm in both the female parent and the F₁; however, one 5S rDNA signal was observed on the short arm in the male parent. Therefore, this study demonstrated that the distribution of ribosomal DNA was greatly different in the F₁ progeny than that of parents.
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