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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.

Hilpinkpan

Terminated

Dianthus caryophyllus L. · Carnation

PETER KEES EVELEENS

2 records

Florvana

Active

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

2 records

HORE9103

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Lendert De Vos

2 records

Florpeltburg

Active

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

ILSE FISCHER-TOEHL

2 records

Have02

Active

Begonia x hiemalis Fotsch · Elatior Begonia

ten Have Jos

2 records

Evert de Gier

Active

Syringa vulgaris L. · Common lilac

Jan-Willem Wezelenburg Boskoop B.V.

2 records

Harunite

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Harteam

Terminated

Rosa L. · Rose

PHILIP HARKNESS

2 records

HLR 190

Active

Helleborus L. · Christmas Rose

Josef Heuger

2 records

ET DLP 827

Active

Delphinium x belladonna hort. ex Bergmans · Belladonna delphinium

Eternal Plant Boijl B.V.

2 records

Harmatch

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Harmanna

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

HARLAGOON

Active

Rosa L. · Rose

R HARKNESS and CO LTD

3 records

Duesalaspla

Active

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

Tobias Dümmen

2 records

HARJOLINA

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

3 records

Hilvulca

Terminated

Dianthus caryophyllus L. · Carnation

HilverdaKooij B.V

2 records

Harfable

Application submitted

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Harentente

Application submitted

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

HARPULSE

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Harpacte

Active

Rosa L. · Rose

ROBERT HARKNESS

2 records

Hilredbu

Terminated

Dianthus caryophyllus L. · Carnation

HilverdaKooij B.V

2 records

Harfracas

Protection expired

Rosa L. · Rose

HARKNESS NEW ROSES LTD

2 records

Harflax

Active

Rosa L. · Rose

HARKNESS NEW ROSES LTD

3 records

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