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Mazharul, I.M.,Reshma, Y.,Jung, J.M.,Mohammad, D.D.,Lim, K.B. International Society for Horticultural Science 2019 Acta Horticulturae Vol. No.
<P> Martagon (<I>Lilium hansonii;</I> MM) and <I>Longiflorum</I> (LL) are two major groups under the family <I>Liliaceae</I>, used for modern breeding to introduce new inter-genomic lily cultivars. Interspecific F<SUB>1</SUB> hybrids (LM) introduced through cut-style method between two diploid <I>Lilium longiflorum (2n=2x=24)</I> and <I>Lilium hansonii (2n=2x=24)</I> were evaluated cytogenetically by genomic in situ hybridization (GISH) technique. However, GISH analysis of F<SUB>1</SUB> interspecific (LM) hybrids showed equal chromosomal contribution from both female <I>Lilium longiflorum</I> (LL) and male <I>Lilium hansonii</I> (MM). Each of the parent contributed 12 chromosomes except three crosses i.e., two of <I>L. longiflorum</I> 'White Tower' × <I>L. hansonii;</I> (2x-1) and one of <I>L. longiflorum</I> 'Bright Tower' × <I>L. hansonii;</I> (2x-1). Among 11 inter-genomic crosses, 3 crosses failed (False hybrid) and 8 crosses (True hybrids) showed different ploidy level i.e., 2n=2x=24, 2n=2x-1=23 and 2n=2x-1=23 respectively. Recombinant chromosome usually not found in F<SUB>1</SUB> interspecific lily hybrids. Most often, genomic recombination occurred in the cross between two genetically different parents. Chromosome pairing and crossing over normally occurred during meiosis in backcross progenies. However, in this study, genome analysis (GISH) of F<SUB>1</SUB> hybrids (<I>L. longiflorum</I> 'White Tower' × <I>L. hansonii</I>) showed four recombinant sites including two M/L and two L/M recombinant chromosomes that denotes high genetic relationship between <I>L. longiflorum</I> and <I>L. hansonii.</I> </P>
MD Mazharul Islam,Hye-Min Lee,Deen Mohammad Deepo,Hong Yul Kim,Ki-Byung Lim 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
This study was aimed at differentiating parental genomes, examining intergenomic composition, and mapping mitotic metaphase chromosomes by localizing parental and 18S rDNA probes in seven interspecific hybrid progenies that originated from Lilium longiflorum. Since in situ hybridization has not been previously used in lily breeding, flow cytometry was used in conjunction with genomic and fluorescent in situ hybridization to determine the genomic contribution of each parent to the interspecific progenies. A significant variation was observed in the DNA content, chromosome length, and 18S loci in F₁ as compared to the female and male parents. L. longiflorum showed nearly two times higher DNA content than the male parents and L. longiflorum × Asiatic progenies, but eight times higher than L. longiflorum × L. hansonii. Genomic in situ hybridization results revealed that both female and male parents contributed an equal number of chromosomes to their interspecific F₁ offspring. Fluorescent in situ hybridization mapping revealed that 18S rDNA had 8, 6 and 7 loci in L. longiflorum parents, i.e., White heaven, Bright tower, and White tower, respectively, whereas each Asiatic cultivar and L. hansonii used as male showed 8 and 12 loci respectively. Interspecific progenies showed 8 and 7 loci in LA, and 10 to 11 in LM hybrids. These cytogenetic results implied equal genetic and chromosomal contribution from both parents to their intergenomic progenies. Therefore, this combined cytogenetic method has the potential to be an affordable and time-saving approach in lily breeding that could determine the status of hybrids and their genomic origin while achieving physical mapping and detecting genes in different genomes.
Islam, Md. Mazharul,Yesmin, Reshma,Jung, Min-Jung,Kim, Hong-Yul,Kim, Chang-Kil,Lim, Ki-Byung Korean Society for Horticultural Science 2020 Horticulture, Environment, and Biotechnology Vol.61 No.2
<P> This study aimed to determine the morphological and cytogenetic differences in an intraspecific Asiatic F<SUB>1</SUB> <I>Lilium</I> hybrid. The results indicated that leaf color and shape, flower morphology including color, spot size on petal, and filament color in the F<SUB>1</SUB> 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 F<SUB>1</SUB> progeny. The female (2n=4x=48) parent had 12 loci of 18S rDNA, whereas the male (2n=2x=24) parent and the F<SUB>1</SUB> (2n=3x=36) had 8 and 11 loci of 18S rDNA, respectively. Moreover, the F<SUB>1</SUB> 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 F<SUB>1</SUB>; 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 F<SUB>1</SUB> progeny than that of parents. </P>