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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.

WP18 MOW09

Active

Dianthus caryophyllus L. · Carnation

Whetman Plants International Limited

2 records

TOSTC0258

Active

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

Monte-Michielsen Fabienne

2 records

TAN99134

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

Tolima

Protection expired

Chrysanthemum L. · Chrysanthemum

Vandenberg Cornelis P.|Salinas, CA

2 records

TAN12652

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

White Amadeus

Active

Hippeastrum Herb. · Amaryllis

Ben van Geest

2 records

TNLEUBL

Active

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

HARINI KORLIPARA

2 records

TAN09441

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

USCAL76602

Active

Calibrachoa Cerv. · Calibrachoa

Ushio Sakazaki

2 records

Virginia

Active

Echinacea purpurea (L.) Moench · Purple coneflower

Petrus Hendricus Oudolf

2 records

TAN04603

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

TAN04247

Active

Rosa L. · Rose

CHRISTIAN EVERS

2 records

WP10 SAB06

Active

Dianthus x allwoodii hort. · Allwood pink

Carolyn Grace Bourne

2 records

WP08 ULR03

Active

Dianthus x allwoodii hort. · Allwood pink

Carolyn Grace Bourne

2 records

Waterloo Sunset

Terminated

Dianthus x allwoodii hort. · Allwood pink

Carolyn Grace Bourne, Carolyn Grace Bourne

2 records

WP 06 FATIMA

Active

Dianthus x allwoodii hort. · Allwood pink

Carolyn Grace Bourne

2 records

Swenym

Active

Hippeastrum Herb. · Amaryllis

TON PETER VAN NIEUWKERK

3 records

The Edge

Active

Tulipa L. · Tulip

Hybris B.V.

2 records

Victoria Wilma

Active

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

Rune Nielsen

2 records

Toledo

Active

Ulmus minor Mill. · Field elm

Dirección General de Desarrollo Rural y Política Forestal, Unidad de Anatomía Fisiología y Genética Forestal

2 records

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