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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.

IPB008816

Active

Rosa L. · Rose

Interplant Roses B.V

1 record

KLEDG20461

Withdrawn

Dianthus x allwoodii hort. · Allwood pink

Nils Klemm^^^Lena Thiede

2 records

Intercomtiw

Terminated

Rosa L. · Rose

Interplant Roses B.V

1 record

Interchoru

Terminated

Rosa L. · Rose

Interplant Roses B.V

1 record

Interbadti

Terminated

Rosa L. · Rose

Interplant Roses B.V

1 record

KLECA23992

Application submitted

Calibrachoa Cerv. · Calibrachoa

Angelo Carrella

1 record

Hilacro

Terminated

Dianthus caryophyllus L. · Carnation

Hilverda B.V

1 record

INHELSOGIA

Active

Heliopsis helianthoides (L.) Sweet · Oxeye sunflower

Silvia Hofmann

1 record

HORE9311

Application submitted

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Lendert De Vos

1 record

Kiastgrana

Withdrawn

Aster dumosus L. · Bushy aster

Andreas Niederländer

1 record

Kitty

Withdrawn

Gerbera L. · Gerbera

FLORIST HOLLAND B.V.

1 record

KLEKB20034

Terminated

Kalanchoe blossfeldiana Poelln. · Flaming Katy

Henk Dresselhuys

1 record

KLEDP22351

Active

Dianthus caryophyllus L. · Carnation

Lena Thiede

1 record

Kerpoliburg

Application submitted

Primula elatior (L.) Hill · Oxlip

Kerley Co Ltd

1 record

KLEDG24478

Application submitted

Dianthus caryophyllus L. · Carnation

Judith Rupp

1 record

KERBELNECTAR

Active

Primula vulgaris Huds. · Primrose

David William Kerley, Priscilla Grace Kerley

1 record

H220911

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

1 record

Hilsinclair

Active

Dianthus caryophyllus L. · Carnation

HilverdaFlorist B.V.

1 record

H218917

Active

Hydrangea macrophylla (Thunb.) Ser. · Bigleaf hydrangea

Hydrangea Breeders Association B.V.

1 record

KLECA19011

Terminated

Calibrachoa Cerv. · Calibrachoa

Dominik Losert

1 record

Hyfatis08

Application submitted

Clematis montana Buch.-Ham. ex DC. · Anemone clematis

Hyfryd Plants

1 record

HSOPR014

Terminated

Hydrangea serrata (Thunb.) Ser. var. serrata · Tea-of-heaven

Plant Select N.V.

1 record

Hot Spice

Terminated

Dianthus L. · Carnation

H.R. WHETMAN & SON

1 record

Just Peachy

Terminated

Begonia x tuberhybrida Voss · Tuberous begonia

Andrew B. Snow

1 record

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