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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.

Irresistible

Active

Echinacea purpurea (L.) Moench · Purple coneflower

van Noort Marco|2361 HG Warmond, NL

3 records

H216906

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

4 records

Harzola

Active

Rosa L. · Rose

Phillp Harkness|Robert Harkness

3 records

Harbella

Protection expired

Rosa L. · Rose

P.A Harkness, Harkness New Roses Ltd

3 records

Fisdel

Terminated

Pelargonium L'Hér. ex Ait. · Geranium

Angelika Utecht

3 records

Fiscountry

Active

Chrysanthemum L. · Chrysanthemum

JOS KESTER

3 records

Intermetal

Application submitted

Rosa L. · Rose

Interplant Roses B.V

3 records

Fikalasaja

Active

Kalanchoe blossfeldiana Poelln. · Flaming Katy

Ike Vlielander

3 records

Fryracy

Active

Rosa L. · Rose

Gareth R. Fryer

3 records

Guava Ice

Active

Echinacea Moench. · Coneflower

Blom Arie

3 records

Evipo029

Active

Clematis L. · Clematis

Poulsen Roser AS, DK - 3480 Fredensborg

3 records

Hort200001

Active

Rhododendron simsii Planch. · Indica azalea

Vanderhaegen Johan|Kruishoutem, BE

3 records

Fire Ball

Active

Xerochrysum bracteatum (Vent.) Tzvelev · Strawflower

R. Luff, Luff Partnership - Turpentine Gardens

3 records

HL 1016

Active

Helleborus niger x Helleborus x hybridus

Josef Heuger

3 records

Hiltrentes

Active

Dianthus L. · Carnation

Hilverda B.V

3 records

HORT9201

Active

Rhododendron simsii Planch. · Indica azalea

HORTIBREED NV

3 records

Evipo099

Active

Clematis L. · Clematis

Poulsen Roser A/S^^^Raymond J. Evison Ltd.

3 records

Evipo055

Active

Clematis L. · Clematis

Poulsen Roser A/S^^^Raymond J. Evison Ltd.

3 records

Evipo005

Terminated

Clematis L. · Clematis

Poulsen Roser AS, DK - 3480 Fredensborg

3 records

Helisbrabic

Active

Xerochrysum bracteatum (Vent.) Tzvelev · Strawflower

van Kleinwee Theodorus Cornelis Maria|Hoorn, NL

3 records

Harzeal

Protection expired

Rosa L. · Rose

Phillp Harkness|Robert Harkness

3 records

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