Xian-hong Ge

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Intertribal somatic hybrids between Brassica napus (2n = 38, AACC) and a dye and medicinal plant Isatis indigotica (2n = 14, II) were obtained by fusions of mesophyll protoplasts. From a total of 237 calli, only one symmetric hybrid (S2) and five asymmetric hybrids (As1, As4, As6, As7 and As12) were established in the field. These hybrids showed some(More)
Researchers recognized early that chromosome behavior, as other morphological characters, is under genetic control and gave some cytogenetical examples such as the homoeologous chromosome pairing in wheat. In the intergeneric sexual hybrids between cultivated Brassica species and another crucifer Orychophragmus violaceus, the phenomenon of parental genome(More)
Alien chromosome addition lines have been widely used for identifying gene linkage groups, assigning species-specific characters to a particular chromosome and comparing gene synteny between related species. In plant breeding, their utilization lies in introgressing characters of agronomic value. The present investigation reports the production of(More)
Intragenomic chromosome homology in the B genome of Brassica nigra and their homoeology with the chromosomes of the A-genome of B. rapa and C-genome of B. oleracea was investigated in triploids (ABC, n = 27) of different origins obtained following hybridizations between natural B. napus (AACC, 2n = 38) × B. nigra (BB, 2n = 16) [AC.B], synthetic B. napus ×(More)
Interspecific hybridization plays a crucial role in plant genetics and breeding. The efficiency of interspecific crosses to a considerable extent depends on the genetic relatedness of genomes from parental species. Interspecific hybrids involving Brassica maurorum (2n = 16, MM) and two Brassica crop species, viz B. rapa (2n = 20, AA) and B. napus (2n = 38,(More)
Abnormal meiosis and microspore development and related defective mutants have often been reported in plants and wide hybrids. Here extra divisions and nuclei fusions were observed to occur in microspore nuclei of partial hybrids between synthetic Brassica hexaploid (2n=54, AABBCC) and another crucifer Orychophragmus violaceus (2n=24). Abnormal spindle were(More)
The intertribal sexual hybrids between three Brassica napus (2n = 38) cultivars and Lesquerella fendleri (2n = 12) with the latter as pollen parent were obtained and characterized for their phenotypes and chromosomal and genomic constitutions. F1 plants and their progenies mainly resembled female B. napus parents, while certain characters of L. fendleri(More)
BACKGROUND AND AIMS In sexual hybrids between cultivated Brassica species and another crucifer, Orychophragmus violaceus (2n = 24), parental genome separation during mitosis and meiosis is under genetic control but this phenomenon varies depending upon the Brassica species. To further investigate the mechanisms involved in parental genome separation,(More)
The gynoecium is one of the most complex organs of angiosperms specialized for seed production and dispersal, but only several genes important for ovule or embryo sac development were identified by using female sterile mutants. The female sterility in oilseed rape (Brassica napus) was before found to be related with one alien chromosome from another(More)
Many plants are allopolyploids with different nuclear genomes from two or more progenitors, but cytoplasmic genomes typically inherited from the female parent. The importance of this speciation mechanism has stimulated the extensive investigations of genetic consequences of genome mergers in several experimental systems during last 20 years. The dynamic(More)