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Hybrid variegation in the genus Pelargonium

M Metzlaf¹, F Pohlheim, T Börner

¹Sektion Biowissenschaften, Wissenschaftsbereich Genetik, Martin-Luther-Universität, Domplatz l, DDR-4020, Halle, German Democratic Republic.

Current Genetics

|November 5, 2013

Abstract:

1) The genetical and cytological analysis of crosses between the wild-type form 'Roseum' of Pelargonium zonale (L.) L 'Herit. ex Ait. and the hybrid species Pelargonium zonale hort. 'Stadt Bern'' revealed the occurrence of hybrid variegation in the genus Pelargonium 2) The plastids in the green-white variegated plants were sorted out in the quick apical way characteristic for Pelargonium chimera. Six types of periclinal chimeras could be observed. 3) The DNAs of the two different plastomes can be distinguished by restriction endonuclease analysis with EcoRl and BamHI. 4) The differences in the cleavage patterns allowed a detailed description of the process of sorting out of the two parental plastids types within the variegated hybrids on the level of their plastid DNA. In all cases observed the cleavage pattern of 'Roseum' plastid DNA was found in the green tissue and the pattern of 'Stadt Bern' plastid DNA in the white tissue. 5) From these results we draw the conclusion that there is a disharmony between the F1-hybrid nucleus and the plastome of Stadt Bern', which blocks the normal differentiation of 'Stadt Bern' plastids.

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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

Hybrid Zones

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Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.

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Test Cross

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