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Variety traits

Double flowering / Reversion

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.

Sources6

Breakdown by crop

Rose Double-flowering 1 377 Tulip double flowering 375 Chrysanthemum double-flowering 344 Carnation Double Flowering 336 Double-flowered Lily 164 Carnation double-floweredness 163 Double-flowering — Pelargonium zonale 162 Gerbera double-flowering 142 Dahlia double-flowering 133 Double-flowering in Begonia elatior 90 Double-flowering in Hydrangea macrophylla 88 Double-flowering in Kalanchoe blossfeldiana 77 Pelargonium double flowering 73 Hippeastrum Double-flowering 68 Double-flowering — Pelargonium peltatum 64 Double-flowering in Garden Chrysanthemum 60 Clematis double flowering 59 Azalea double-flowering 56 Double flowers in Impatiens walleriana 54 Freesia double flowers 48 Kalanchoe double flowering 41 Rhododendron doubleness 38 Double-flowering — Tuberous Begonia 38 Double-flowering — Chrysanthemum indicum 32

Found in these crops

Rose 1 840 Tulip 404 Chrysanthemum 348 Carnation 347 Carnation 165 Horseshoe pelargonium 161 Lily 148 Dahlia 141 Gerbera 139 Almond 111 Bigleaf hydrangea 98 Elatior Begonia 88

Varieties that feature this in their description

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.

Piccolino

Terminated

Echinacea Moench. · Coneflower

Marco van Noort Vaste Planten V.O.F.

1 record

Peach

Terminated

Impatiens walleriana Hook. f. · Busy Lizzie

PARKER RONALD D.^^^CLELAND MARYKE

1 record

Ostra

Terminated

Chrysanthemum L. · Chrysanthemum

Pieters Plant Production B.V.B.A.

1 record

Mount Hood

Withdrawn

Echinacea Moench. · Coneflower

Molter B.V.

1 record

Petit Henri

Withdrawn

Silene flos-cuculi (L.) Greuter & Burdet · Meadow Campion

Olivier Beginn

1 record

PEPZ0012

Withdrawn

Pelargonium peltatum (L.) L'Hér. · Ivy-leaf geranium

Syngenta Crop Protection AG

1 record

Mont Blanc

Terminated

Chrysanthemum L. · Chrysanthemum

MTS VAN DER MEER

1 record

PEQZ0049

Terminated

hybrids between Pelargonium peltatum and Pelargonium zonale · Ivy-leaved geranium

Syngenta Crop Protection AG

1 record

PEQZ0044

Active

Pelargonium L'Hér. ex Ait. · Geranium

Syngenta Flowers LLC

1 record

Pepito

Terminated

Dianthus caryophyllus L. · Carnation

Flavio Costanzo Sapia

1 record

NOA167897

Terminated

Rosa L. · Rose

Reinhard Noack

1 record

NCYU Cherry

Withdrawn

Agave x bundrantii (T. M. Howard) Thiede & Eggli

Huang Kuang-Liang

1 record

Narcea

Active

Rosa L. · Rose

José Luis Santiago Blanco^^^Susana Boso Alonso^^^Pilar Gago Montaña^^^María del Carmen Martínez Rodríguez

1 record

NOA11321

Active

Rosa L. · Rose

Reinhard Noack

1 record

PACPZ16081

Active

Pelargonium zonale (L.) L'Hér. · Horseshoe pelargonium

Martin Geibel

1 record

Nirvana

Withdrawn

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

1 record

Morella

Terminated

Dianthus caryophyllus L. · Carnation

Barberet & Blanc S.A.

1 record

Patty

Terminated

Dahlia Cav. · Dahlia

PanAmerican Seed Europe B.V.

1 record

Mont Blanc

Terminated

Rhododendron L. · Azalea

L.J. van der Meer B.V.

1 record

Paislee

Withdrawn

Kalanchoe Adans. · Kalanchoe

Knud Jepsen A/S

1 record

Miss Malen

Terminated

Begonia x tuberhybrida Voss · Tuberous begonia

Ingvoldstad Gartneri

1 record

Mincharb13221

Application submitted

Chaenomeles speciosa (Sweet) Nakai · Chinese-quince

Hortival Diffusion S.A.S.

1 record

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