Variety traits
Reversion virus
In crop production, the term refers to two distinct concepts: a decorative trait characterized by an increased number of petals in flowers, or a dangerous viral disease of blackcurrants that causes sterility.
Mentioned in descriptions 16 231 varieties reference book.
In ornamental horticulture, double flowering is a varietal characteristic expressed by an increased number of petals in a flower to enhance aesthetic appeal. In the case of blackcurrants, double flowering, or reversion, manifests as a viral disease in which flowers are deformed into purple outgrowths, leaves lose their shape, and the plant becomes sterile.
This trait is assessed as a qualitative phenotypic indicator. In ornamental crops, double flowering is recorded during variety trials either visually or by using scoring systems for ornamental quality. Regarding currants, double flowering is considered a critical symptom, the presence of which requires phytosanitary culling of infected specimens.
Resistance of a variety to pathological reversion is determined by the genetic ability to withstand the virus and its vector, the currant bud mite. When choosing planting material for a garden, preference should be given to varieties with proven genetic resistance, as there are no numerical units of measurement for this trait.
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Brassica napus var. napus · Rapeseed
DLF-TRIFOLIUM A/S
Rosa L. · Rose
Rosen-Tantau Mathias Tantau Nachfolger
Rosa L. · Rose
WILHELM KORDES, T-H., M.
Hordeum vulgare L. · Barley
W. von Borries-Eckendorf GmbH & Co.KG
Rosa L. · Rose
SNC Meilland et Cie
Rosa L. · Rose
W.KORDES' SOEHNE ROSENSCHULEN GMBH & CO KG
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
Hofmann Christa
Rosa L. · Rose
W.KORDES' SOEHNE ROSENSCHULEN GMBH & CO KG
Rosa L. · Rose
KORDES' SOEHNE| W. Kordes' Soehne Rosenschulen GmbH & Co KG
Rosa L. · Rose
W. Kordes Sohne Rosenschulen GmbH & Co KG| DE
Pelargonium peltatum (L.) L'Hér. · Ivy-leaf geranium
Guillou, Maurice/Guillou, Jacques/Guillou, Bernard
Dianthus caryophyllus L. · Carnation
Siegfried Klemm
Zea mays L. · Maize
Saaten-Union
Zea mays L. · Maize
SEMUNION
Lilium L. · Lily
WIM VLETTER
Dianthus caryophyllus L. · Carnation
VAN STAAVEREN B.V.
Dianthus caryophyllus L. · Carnation
van Staaveren B.V.
Pelargonium peltatum (L.) L'Hér. · Ivy-leaf geranium
Siegfried Klemm, Klemm + Sohn GmbH & Co. KG
Helianthus annuus L. · Sunflower
KOIPESOL SEMILLAS, S.A.
Gerbera L. · Gerbera
Terra Nigra B.V./Eeuwes
Rosa L. · Rose
Hans Jurgen Evers
Lilium L. · Lily
Vletter & Den Haan Beheer B.V
Rosa L. · Rose
POUW| A.A. Pouw
Rosa L. · Rose
Poulsen Roser Aps (DK)