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.
Saintpaulia ionantha H. Wendl. · African violet
OPTIMARA ERFINDERGEMEINSCHAFT, GEBR. HOLTKAMP
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
ENTHOVEN ADRIANUS W.M.
Pelargonium L'Hér. ex Ait. · Geranium
Klemm
Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium
ENTHOVEN ADRIANUS W.M.
Rosa L. · Rose
MEILLAND MARIE| Marie-Louise Meilland
Rosa L. · Rose
SNC Meilland et Cie
Hordeum vulgare L. · Barley
Svalof Weibull AB
Rosa L. · Rose
Meilland, Alain A.|Antibes, France
Rosa L. · Rose
S.N.C. Meilland & Cie
Rosa L. · Rose
Sam McGredy
Brassica napus L. · Rapeseed
KWS SAAT SE Germany
Rosa L. · Rose
Werner Kordes / Reimer Kordes / Wilhelm Kordes
Dianthus L. · Carnation
Siegfried KLEMM (DE)
Rosa L. · Rose
W. Kordes Sohne Rosenschulen GmbH & Co KG| DE
Rosa L. · Rose
Werner Kordes / Reimer Kordes / Wilhelm Kordes
Dianthus caryophyllus L. · Carnation
Maarten Jacob Tas
Dianthus caryophyllus L. · Carnation
Siegfried Klemm
Rosa L. · Rose
Pepinieres et Roseraies Georges Delbard| FR
Calluna vulgaris (L.) Hull · Common heather
MAASEN FRANZ EN CANDERS GERD
Chrysanthemum L. · Chrysanthemum
WILLIAM E DUFFETT
Chrysanthemum L. · Chrysanthemum
VandenBerg, Cornelius P.
Rosa L. · Rose
WEEKS & SWIMS
Brassica napus var. napus · Rapeseed
PRODANA SEEDS S\A
Trifolium pratense L. · Red clover
Skriveri Research Centre