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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.

WEKbepmey

Active

Rosa L. · Rose

Weeks Roses

3 records

TAN05372

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Vialfas

Active

Prunus dulcis (Mill.) D. A. Webb · Almond

Rafael Socias i Company^^^José M. Alonso Segura^^^Ossama Kodad

4 records

Wescadopi

Active

Calibrachoa Cerv. · Calibrachoa

Westhoff Heinrich|Sudlohn, DE

3 records

Tiara

Active

Phlox paniculata L. · Garden phlox

Verschoor Jan

3 records

Winter Queen

Terminated

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

3 records

Victoria Fanny

Active

Symphyotrichum novi-belgii (L.) G. L. Nesom · New York aster

Kristiansen Kell

3 records

Tinkerbell

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Toyokazu Ichie

3 records

Tan12690

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Tan07891

Active

Rosa L. · Rose

EVERS CHRISTIAN

4 records

Swered

Active

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

Martin Geibel c/o Elsner pac Jungpflanzen GbR

3 records

TAN05415

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Sugamo

Active

Gazania Gaertn. · Treasure flower

Thomas M. Cunneen

3 records

Totally Tangerine

Active

Geum quellyon Sweet x Geum rivale L.

Crowther Timothy|Arundel, GB

3 records

Traveller

Terminated

Petunia Juss. · Petunia

Graham N. Brown

3 records

TAN08387

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Sunrimaizy

Active

Leucanthemum x superbum (Bergmans ex J. W. Ingram) D. H. Kent · Shasta daisy

Trees Scott C

4 records

Swero

Active

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

Hofmann Christa|Radeburg, DE

3 records

Tan07890

Active

Rosa L. · Rose

EVERS CHRISTIAN

4 records

TAN02733

Active

Rosa L. · Rose

CHRISTIAN EVERS

3 records

Silt Salm09

Active

Impatiens walleriana Hook. f. · Busy Lizzie

Krassenberg Jolanda|Andijk, NL

3 records

Sunsurfelevi

Terminated

Petunia Juss. · Petunia

Takeshi Kanaya^^^Yasuko Isobe

3 records

Sparkler Red

Active

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

Lemon David

3 records

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