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Cytogenetic Analysis of the Primary Amphidiploid Derived from Interspecific Hybridization in Cucumis and Its Selfed Progenies

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Agricultural Sciences in China 2005年第5期4卷 336-342页

作者： CHENJin-feng QIANChun-tao JEStaub LUOXiang-dong ZHUANGFei-yun NationalKeyLaboratoryofCropGeneticsandGermplasmEnhancement CollegeofHorticultureNanjingAgriculturalUniversityNanjing210095P.R.China USDA／ARS DepartmentofHorticultureUniversityofWisconsinMadisonWI53706USA

Studies on the reproduction and cytogenetic characterization of a primary amphidiploid Cucumis species C. hytivus Chen and Kirkbride (2n = 4x = 38) indicated that a more comprehensive cytogenetic analysis of this species and its first selfed progeny would increase its potential utility in cucumber improvement. With tendrils used as source materials for mitotic analysis, chromosome numbers in all selfed progenies were 2n = 38, confirming chromosomal stability in this synthetic amphidiploid species. Detailed meiotic processes were described by comparing the primary and the selfed amphidiploids. Meiotic abnormalities, such as chromosome lagging, unequal separation, chromosome multi-polarization and polyads were observed frequently in all amphidiploid plants except for the selfed no.8, in which meiosis was arrested prior to metaphase Ⅰ. Generally, the frequency of multivalents was higher and the configurations were more complex in the selfed progenies, demonstrating a more extensive genetic exchange between cucumber and C. hystrix Chakr. genome separation between cucumber and C. hystrix was observed through prophase Ⅰ to anaphase Ⅰ in both generations of the amphidiploids. Consequently, in addition to n = 19, a new gamete with n = 7 was produced, which was confirmed by the chromosome counts 2n = 14 in the backcrossing progenies from cucumber × amphidiploid mating. Fertility varied among the selfed amphidiploid plants. The selfed plant no.1 was found to have an improved fertility (e.g., pollen staining ability 40.8% and 25.6 seeds per fruit) and then was used as source germplasm in further introgression and gene exchange experiments.

关键词： Interspecific hybridization Cucumis Chromosome pairing genome separation Amphidiploid

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Genomic in situ hybridization analysis on intergeneric hybrids between Brassica species and Orychophragmus violaceus

Genomic in situ hybridization analysis on intergeneric hybri...

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第一届亚洲植物染色体学术讨论会

作者： M. Ceccarelli S. Minelli A.Contento P.G.Cionini Department of Cellldlar and Molecular Biology University of Perugia Via A . Pascoli I-06123 Perugia Italy Department of Cellldlar and Molecular Biology University of Perugia Via A . Pascoli I-06123 Perugia Italy Department of Cellldlar and Molecular Biology University of Perugia Via A . Pascoli I-06123 Perugia Italy Department of Cellldlar and Molecular Biology University of Perugia Via A . Pascoli I-06123 Perugia Italy

＜正＞ In sexual intergeneric hybrids between the six cultivated Brassica species and Orychophragmus violaceus , the possible occurrence of both complete and partial separation of the parental genomes during mitosis and meiosis has been proposed and the interrelationships among the cytogenetics of these hybrids have been shown. To confirm and further elucidate the findings

关键词： Brassica species Orychophragmus violaceus Intergeneric hybrids genome separation Genomic in situ hybridization

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