Prospects of in Vitro Methods in the Breeding of Rosa Rugosa in Latvia

Jakobsone, Gunta

doi:10.17660/actahortic.2001.560.27

Acta Hortic.

2001

DOI: 10.17660/actahortic.2001.560.27

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Prospects of in Vitro Methods in the Breeding of Rosa Rugosa in Latvia

Gunta Jakobsone¹

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“…R. rugosa , a vigorous ornamental shrub that naturally occurs on the shores of temperate and northern Eastern Asia, has many favorable traits, such as fragrant flowers, recurrent blooming, disease and pest resistance, and drought, cold, and salt tolerance [Mercure and Bruneau, 2008]. Thus, the species is a potential genetic resource for improving modern rose cultivars [Yang et al, 2009] and has been successfully used as an important hybridizing parent in rose breeding programs [Jakobsone, 2001].…”

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Distribution of 45S rDNA in Modern Rose Cultivars (Rosa hybrida), Rosa rugosa, and Their Interspecific Hybrids Revealed by Fluorescence in situ Hybridization

Ding

Xu²,

Wang³

et al. 2016

Cytogenet Genome Res

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To elucidate the evolutionary dynamics of the location and number of rDNA loci in the process of polyploidization in the genus Rosa, we examined 45S rDNA sites in the chromosomes of 6 modern rose cultivars (R. hybrida), 5 R. rugosa cultivars, and 20 hybrid progenies by fluorescence in situ hybridization. Variation in the number of rDNA sites in parents and their interspecific hybrids was detected. As expected, 4 rDNA sites were observed in the genomes of 4 modern rose cultivars, while 3 hybridization sites were observed in the 2 others. Two expected rDNA sites were found in 2 R. rugosa cultivars, while in the other 3 R. rugosa cultivars 4 sites were present. Among the 20 R. hybrida × R. rugosa offspring, 13 carried the expected number of rDNA sites, and 1 had 6 hybridization sites, which exceeded the expected number by far. The other 6 offspring had either 2 or 3 hybridization sites, which was less than expected. Differences in the number of rDNA loci were observed in interspecific offspring, indicating that rDNA loci exhibit instability after distant hybridization events. Abnormal chromosome pairing may be the main factor explaining the variation in rDNA sites during polyploidization.

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confidence: 99%

Distribution of 45S rDNA in Modern Rose Cultivars (Rosa hybrida), Rosa rugosa, and Their Interspecific Hybrids Revealed by Fluorescence in situ Hybridization

Ding

Xu²,

Wang³

et al. 2016

Cytogenet Genome Res

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Prospects of in Vitro Methods in the Breeding of Rosa Rugosa in Latvia

Cited by 1 publication

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Distribution of 45S rDNA in Modern Rose Cultivars <b><i>(Rosa hybrida)</i></b>, <b><i>Rosa rugosa</i></b>, and Their Interspecific Hybrids Revealed by Fluorescence in situ Hybridization

Distribution of 45S rDNA in Modern Rose Cultivars <b><i>(Rosa hybrida)</i></b>, <b><i>Rosa rugosa</i></b>, and Their Interspecific Hybrids Revealed by Fluorescence in situ Hybridization

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