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.

Mulopi

Protection expired

Dianthus L. · Carnation

VAN STAAVEREN BV (NL)

3 records

Monterey

Active

Prunus dulcis (Mill.) D. A. Webb · Almond

Stretch, Robert / Stretch, Kenneth

3 records

Nacido

Protection expired

Chrysanthemum L. · Chrysanthemum

Vandenberg Cornelis P.|Salinas, CA

3 records

Mondial

Active

Tulipa L. · Tulip

V.O.F. HYBRIS

3 records

Meinarval

Terminated

Rosa L. · Rose

Universal Rose Selection-Meilland

3 records

Meizoele

Application submitted

Rosa L. · Rose

Meilland Alain A.|Antibes, FR

4 records

Meitiloly

Protection expired

Rosa L. · Rose

Marie Louise Meilland (FR)

3 records

Meistadi

Active

Rosa L. · Rose

Meilland Alain A.

3 records

Meilavio

Active

Rosa L. · Rose

Meilland, Alain A.|Antibes, France

3 records

Meirokad

Terminated

Rosa L. · Rose

MEILLAND ALAIN| Alain Meilland

3 records

Meialoro

Active

Rosa L. · Rose

MEILLAND INTERNACIONAL

3 records

Meiptima

Active

Rosa L. · Rose

Meilland, Alain A.|Antibes, France

4 records

Meigenpi

Active

Rosa L. · Rose

Meilland Alain A.|Antibes, FR

3 records

Miss Mirthe

Active

Rhododendron simsii Planch. · Indica azalea

DRIEGHE AZALEA BVBA

3 records

Manet

Active

Lactuca sativa L. · Lettuce

Rijk Zwaan Zaadteelt en Zaadhandel B.V.

6 records

Marie Jo

Active

Tulipa L. · Tulip

P. Boon V.O.F.

3 records

Magic Star

Active

Lilium L. · Lily

Rooijakkers Breezand B.V.

3 records

Mel

Active

Dianthus caryophyllus L. · Carnation

California Florida Plant Company L.P.

3 records

Meirigalu

Terminated

Rosa L. · Rose

Meilland International

3 records

Macmanly

Protection expired

Rosa L. · Rose

Sam McGredy Roses International

3 records

MABEL

Active

Dianthus L. · Carnation

Nobbio G.

3 records

Lovita

Protection expired

Rosa L. · Rose

S.N.C. MEILLAND ET CIE

3 records

Linde de Lo

Active

Rhododendron simsii Planch. · Indica azalea

DRIEGHE AZALEA BVBA

3 records

Mactemaik

Protection expired

Rosa L. · Rose

Samuel McGredy

3 records

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Variety traits

Maturity group 89 063
Yield 67 000
Vigor 53 548
Plant height 51 504
Lodging 50 198
Taste and aroma 36 010
Variety origin 29 523
Productivity 27 845

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Text source

This summary is compiled from the publications listed in the sources and verified by an editor. It contains no legally significant information; it provides agronomic context for registry data rather than the registry data itself.