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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.

KLEN03031

Terminated

Dianthus caryophyllus L. · Carnation

Nils Klemm

2 records

Korbever

Terminated

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

2 records

KV5701

Active

Phalaenopsis Bl. · Moth Orchid

KV Orchids Co. Ltd.

2 records

Karma Gold

Active

Dahlia Cav. · Dahlia

Verwer-Dahlia's B.V.

2 records

Koraplicam

Active

Rosa L. · Rose

Wilhelm-Alexander Kordes, Tim-Hermann Kordes, John-Vincent Kordes

2 records

Kortakmo

Terminated

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

2 records

Korselary

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

2 records

KLEDP23527

Application submitted

Dianthus caryophyllus L. · Carnation

MAIKE BOXRIKER

2 records

KLEDM15AI8

Terminated

Dianthus caryophyllus L. · Carnation

PER KLEMM|TRAUDE MUNDINGER-FLAD

2 records

KLECA24A86

Application submitted

Calibrachoa Cerv. · Calibrachoa

Klemm+Sohn GmbH &Co.KG

2 records

Korlalon

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

3 records

KLECA14261

Terminated

Calibrachoa Cerv. · Calibrachoa

NILS KLEMM|ANITA STOEVER

2 records

KLEC04064

Terminated

Petunia Juss. · Petunia

Nils Klemm

2 records

Jasoda Yellow

Terminated

Chrysanthemum L. · Chrysanthemum

PARATY B.V.B.A

2 records

LAZPRT1617

Active

Portulaca umbraticola Kunth · Wingpod purslane

Nebelmeir Johannes Sebastian

3 records

Lariva Red

Active

Chrysanthemum L. · Chrysanthemum

PARATY B.V.B.A

2 records

Leila

Terminated

Dianthus L. · Carnation

La Villetta S.R.L.

2 records

Ketchup

Active

Gerbera L. · Gerbera

Holstein Select B.V.

2 records

Kercaltan

Active

Calendula officinalis x Calendula suffruticosa

Priscilla Grace Kerley, David William Kerley, Timothy Edward Kerley, Sarah Elisabeth Kerley

2 records

Kerbelgoldie

Active

Primula vulgaris Huds. · Primrose

David William Kerley, Timothy Edward Kerley, Sarah Elisabeth Kerley, Priscilla Grace Kerley

2 records

Kerannawit

Active

Primula elatior (L.) Hill · Oxlip

Kerley David William,Kerley Timothy Edward

2 records

Keidopinul

Active

Petunia Juss. · Petunia

Shinya Miyano

2 records

KLEDP20311

Active

Dianthus caryophyllus L. · Carnation

Thiede Lena

2 records

KORsineo

Active

Rosa L. · Rose

Wilhelm Kordes,Tim-Hermann Kordes,Margarita Kordes

2 records

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