USTUN53402

Petunia

Variety Description

Variety used for comparison: 'Constraw' (Mini Strawberry Pink Veined)

Summary: The leaves of 'USTUN53402' are circular and wider than those of 'Constraw', which are ovate and elliptic. When newly opened, the inner side of the corolla of 'USTUN53402' is violet while that of 'Constraw' is blue pink. When fully opened, the inner side of the corolla of 'USTUN53402' is violet with purple primary veins and lighter purple secondary veins while that of 'Constraw' is blue pink with dark purple red primary veins and purple red secondary veins. When aged, the inner side of the corolla of 'USTUN53402' is light blue violet with purple primary veins while that of 'Constraw' is light blue pink. The corolla lobe of 'USTUN53402' has a rounded and truncate apex while that of 'Constraw' has a cuspidate apex. The main colour of the outer side of the corolla tube is grey with brown purple veins for 'USTUN53402' while it is violet with light green veins for 'Constraw'. Before dehiscence, the anther of 'USTUN53402' is violet while it is yellowish white for 'Constraw'.

Description:

PLANT: spreading growth habit
SHOOT: thin on lower third

LEAF BLADE: circular shape, obtuse apex, no variegation, medium to dark green on upper side, weak to medium blistering

PEDICEL: absent or very weak anthocyanin colouration
FLOWER: single type, salverform shape
COROLLA: medium to strong degree of lobing, absent or very shallow incisions of margin, weak degree of undulation, strong conspicuousness of veins, pink veins, when newly opened inner side is violet (RHS 75B), when fully opened inner side is violet (RHS 75B) with purple (RHS 71A) primary veins and lighter purple (RHS 71B-C) secondary veins, when aged inner side is light blue violet (RHS 76C) with purple (darker than RHS 71A) primary veins
COROLLA LOBE: rounded and truncate apex
COROLLA TUBE (INNER SIDE): blue violet (RHS N82D) with brown purple (darker than RHS N77A) veins, medium conspicuousness of veins
COROLLA TUBE (OUTER SIDE): grey (lighter than RHS N187D) with brown purple (darker than RHS N77A) veins
ANTHER: violet before dehiscence

Origin & Breeding History: 'USTUN53402' originated from a controlled cross conducted by the breeder, Ushio Sakazaki, in Higashiomi, Shiga, Japan on May 10, 2010. The cross was made between the female proprietary seedling 'P435-03' and the male parent 'Pixie Blue Veined'. The new plant was selected from the resulting progeny on May 13, 2011 in Bonsall, California, USA. 'USTUN3003' was selected based on its good branching, floriferousness, season long blooming and good heat and humidity tolerance. This variety was first propagated by vegetative tip cuttings on May 16, 2011 in Bonsall, California, USA.

Tests & Trials: The comparative trial for 'USTUN53402' was conducted in a polyhouse during the spring of 2015 at BioFlora Inc. in St. Thomas, Ontario. The trial included a total of 20 plants each of the candidate and reference variety. All plants were grown from rooted cuttings and each transplanted into a 15 cm pot on April 13, 2015. Observations and measurements were taken from 10 plants or parts of plants of each variety on May 25, 2015. All colour determinations were made using the 2007 Royal Horticultural Society (RHS) Colour Chart.

Comparison tables for 'USTUN53402' with reference variety 'Constraw'

Leaf blade width (cm)

Colour of inner side of corolla (RHS)

Colour of corolla tube (RHS)

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Petunia: 'USTUN53402' (left) with reference variety 'Constraw' (right)

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Petunia: 'USTUN53402' (left) with reference variety 'Constraw' (right)

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Petunia: 'USTUN53402' (left) with reference variety 'Constraw' (right)