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Acta 93.indd - Výzkumný ústav Silva Taroucy pro krajinu a okrasné ...

Acta 93.indd - Výzkumný ústav Silva Taroucy pro krajinu a okrasné ...

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<strong>Acta</strong> Pruhoniciana 93: 19–26, Průhonice, 2009SEGREGATION RATIOS OF LEAF COLOUR AND LETHALITY IN GOLDEN-LEAVED PELARGONIUM × HORTORUM BAILEYŠTĚPNÉ POMĚRY BARVY LISTŮ A LETALITA U ZLATOLISTÝCH TYPŮPELARGONIUM × HORTORUM BAILEYOtka Plavcová<strong>Silva</strong> Tarouca Research Institute for Landscape and Ornamental Gardening, Publ. Res. Inst., Květnové nám., 391 , 252 43 Průhonice,Czech Republic, plavcova@vukoz.czAbstractThe aim of our study was to test segregation ratios in golden-leaved pelargoniums, particularly from the aspect of the<strong>pro</strong>duction of golden-leaved hybrid varieties <strong>pro</strong>pagated by seeds. The golden colour of leaves in Pelargonium × hortorum iscontrolled by the nuclear gene aurea with incomplete dominance. Golden-leaved types may exist only as heterozygotes (Aur + /Aur) while the light yellow homozygous constitution (Aur/Aur) is lethal. When heterozygous golden-leaved and homozygousgreen-leaved ((Aur + /Aur + ) lines were crossed, only three golden-leaved lines (from the five tested) had <strong>pro</strong>genies with segregationratios consistent with expected segregation ratio 1:1. But also in these consistent <strong>pro</strong>genies was, in the most cases, the classof golden-leaved heterozygotes reduced (reduction by 7–8%). Two hybrid combinations had segregation ratios significantlydifferent (reduction of golden-leaved herozygotes by 15% and 43%). In the phase of cotyledons the segregation ratios of selfedgolden-leaved lines (Aur + /Aur) were altered in a different way with a reduction in classes containing lethal alleles (1 Aur + /Aur +:

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