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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.

STARLIGHT

Protection expired

Dianthus L. · Carnation

HILVERDA B.V. (NL)

FR
2 records

Stallion

Protection expired

Chrysanthemum x morifolium Ramat. · Florist's daisy

JACQUES C. M. VAN DER KNAAP

DE
2 records

Starway

Active

Brassica oleracea L. (Cauliflower Group) · Cauliflower

Enza Zaden Beheer B.V.

NL
2 records

Sollux

Terminated

Brassica napus var. napus · Rapeseed

INSTITUT GROSS LUESEWITZ| Institut fuer Pflanzenzuechtung

DE
2 records

Soulmate

Active

Tulipa L. · Tulip

Testcentrum voor Siergewassen B.V.

NL
2 records

Stockholm

Active

Lilium L. · Lily

Vletter & Den Haan Beheer B.V

NL
2 records

Sorbonne

Active

Tulipa L. · Tulip

Vincent Sneeboer

NL
2 records

Stacorpi

Protection expired

Dianthus L. · Carnation

Jacob VAN ANDEL (NL)

FR
2 records

Sil Wittje

Terminated

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

ILSE FISCHER-TOEHL

DE
2 records

Sil Insa

Terminated

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

ILSE FISCHER-TOEHL

DE
2 records

Sil Selma

Terminated

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

ILSE FISCHER-TOEHL

DE
2 records

Shemigan

Protection expired

Dianthus caryophyllus L. · Carnation

GIDEON SCOVEL

NL
2 records

SIL Tomke

Terminated

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

ILSE FISCHER-TOEHL

DE
2 records

Severine

Terminated

Chrysanthemum L. · Chrysanthemum

Segers Select C.V.

BE
2 records

Silvester

Terminated

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

NL
2 records

Semira

Terminated

Chrysanthemum L. · Chrysanthemum

Segers Select C.V.

BE
2 records

Senna

Application submitted

Lilium L. · Lily

De Looff World Breeding B.V.

NL
2 records

Shemcher

Terminated

Dianthus caryophyllus L. · Carnation

GIDEON SCOVEL

NL
2 records

SIL Lea

Terminated

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

ILSE FISCHER-TOEHL

DE
2 records

Savio

Active

Lilium L. · Lily

Vletter & Den Haan Beheer B.V

NL
2 records

SAUDRIL

Terminated

Rosa L. · Rose

Bernard SAUVAGEOT (FR)

FR
2 records

Schoene Helena

Protection expired

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

INGEBORG SCHUMANN

DE
2 records

Sammir

Active

Lactuca sativa L. · Lettuce

Enza Zaden Beheer B.V.

NL
4 records

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