Sweet Caroline Sweetheart Purple

Sweet Potato

Denomination: 'Sweet Caroline Sweetheart Purple'
Botanical Name: Ipomoea batatas
Applicant/Holder: North Carolina State University
Office of Technology Transfer
1021 Main Campus Drive
Raleigh, North Carolina
27606
United States of America
Breeder: G. Craig Yencho, North Carolina State University, Raleigh, United States of America
Kenneth Pecota, North Carolina State University, Raleigh, United States of America
Charles Newell Hancock, Bear Creek, United States of America
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Canada
Tel: 519-631-6241
Application Date: 2005-12-22
Application Number: 05-5199
Grant of Rights Date: 2007-09-07
Certificate Number: 2902
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2009-09-07
Date rights surrendered: 2016-09-07

Variety Description

Varieties used for comparison: 'Black Heart' (Ace of Spades) and 'Sweet Caroline Purple'

Summary: 'Sweet Caroline Sweetheart Purple' has an upright-bushy to bushy-rounded growth habit while it is mounding to spreading in 'Black Heart'. The plant height of 'Sweet Caroline Sweetheart Purple' is taller than 'Black Heart' and 'Sweet Caroline Purple'. 'Sweet Caroline Sweetheart Purple' has a narrower plant with more branching than 'Black Heart'. The leaf of 'Sweet Caroline Sweetheart Purple' is smaller than 'Black Heart'. 'Sweet Caroline Sweetheart Purple' has a cordate shaped leaf while it is reniform to palmately lobed in 'Sweet Caroline Purple'.The leaf base of 'Sweet Caroline Sweetheart Purple' is cordate while it is truncate to reniform in 'Sweet Caroline Purple'. 'Sweet Caroline Sweetheart Purple' has a shorter petiole than 'Black Heart'.

Description:

PLANT: vegetatively propagated perennial grown as an annual, upright-bushy to bushy-rounded growth habit, dense degree of branching

STEM: purple, absent or weak glaucosity, absent or very sparse pubescence, medium thickness, smooth shape

LEAF: alternately arranged, simple type, cordate shape, acute to acuminate apex, cordate base, entire margin, absent to very sparse pubescence on upper and lower side, absent to very weak glaucosity on upper side, black (RHS N186A) upper side, brown purple (RHS 187A) lower side, no variegation, petiole present, very strong anthocyanin colouration of petiole

Origin & Breeding History: 'Sweet Caroline Sweetheart Purple' is derived from the open pollination of NC308-1ORN during the fall winter of 2001, 2002 at North Carolina State University, Raleigh, North Carolina, USA. NC308-1ORN resulted from the cross between clone 'L84-74 x BL-22' as the female parent and the clone 'W201 x BL-1' as the male parent. A single plant was selected from the seed grown in August/September 2002 after being evaluated that spring/summer in the greenhouses based on foliage colour, leaf shape and size, branching, plant growth habit, flowering ability and plant vigour. The experimental designation was NC1645-24NORN.

Tests & Trials: Trials were conducted during the summer of 2006 in Oxford Station, Ontario. 15 plants of each variety were individually grown in 10cm pots in a polyhouse. Plants were spaced 30cm apart. Observations and measurements were taken on 10 plants of each variety. Colour measurements were done using the 2001 RHS colour chart.


Comparison tables for 'Sweet Caroline Sweetheart Purple' with reference varieties 'Black Heart' and 'Sweet Caroline Purple'

Plant height (cm)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
mean 25.4 15.4 15.2
std. deviation 2.45 2.40 0.97

Plant width (cm)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
mean 34.4 56.0 38.3
std. deviation 9.16 3.02 7.96

Leaf length (cm)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
mean 11.38 20.10 12.90
std. deviation 3.31 1.70 1.79

Leaf width (cm)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
mean 4.90 9.50 6.06
std. deviation 0.24 1.17 0.75

Petiole length (mm)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
mean 58.86 105.14 55.86
std. deviation 14.83 14.75 15.52

Leaf colour (RHS)

  'Sweet Caroline Sweetheart Purple' 'Black Heart' 'Sweet Caroline Purple'
upper side N186A N200A/200A N187A/N186A/B
lower side 187A 187A 187A

Click on image for larger view
Sweet Caroline Sweetheart Purple
Sweet Potato: 'Sweet Caroline Sweetheart Purple' (left) with reference variety 'Black Heart' (right)

Click on image for larger view
Sweet Caroline Sweetheart Purple
Sweet Potato: 'Sweet Caroline Sweetheart Purple' (left) with reference variety 'Sweet Caroline Purple' (right)

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