Genetics of Orange Flower Color in Pelargonium X Hortorum

Interspecific Crossability and Inheritance in Pelargonium

“…The first record of a flower-colour mutation in Pelargonium dates from 1859. ln the meantime, there have been four major studies on flowercolour genetics in P. x hortorum (CRAIG 1963, BADR and HORN 1971a, PAN et al 1990, ALMOUSLEM et al 1991. The four basic genes in their opinion, the recessive alleles are not directly responsible for salmon, pink or white phenotypes.…”

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“…The first record of a flower-colour mutation in Pelargonium dates from 1859. ln the meantime, there have been four major studies on flowercolour genetics in P. x hortorum (CRAIG 1963, BADR and HORN 1971a, PAN et al 1990, ALMOUSLEM et al 1991. The four basic genes AEMOUSEEM et al (1991), as, in their opinion, the recessive alleles are not directly responsible for salmon, pink or white phenotypes.…”

“…The gene Or (PAN et al 1990) changes, as or or, the red phenotype {P-Sa-), to orange, the salmon phenotype {P-sasa) to deep salmon, the red phenotype {"Ww P-Sa-) to peach, and the pink phenotype {pp Sa-) to rose-white. Furthermore a gene 1 is postulated, which modifies orange to red-orange when dominant.…”

“…Furthermore a gene 1 is postulated, which modifies orange to red-orange when dominant. The results of PAN et al (1990) are firmly based on evidence, but a true-breeding red-orange, for example, has not yet been produced. Several authors have found dominant or recessive genes which intensify or dilute flower colour.…”