Sweet Caroline Green Yellow

Sweet Potato

Denomination: 'Sweet Caroline Green Yellow'
Botanical Name: Ipomoea batatas
Applicant/Holder: North Carolina State University
Office of Technology Transfer
1021 Main Campus Drive
Raleigh, North Carolina
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
Agent in Canada: BioFlora Inc.
38723 Fingal Line
R.R. #1
St. Thomas, Ontario
N5P 3S5
Tel: 519-631-6241
Application Date: 2005-12-22
Application Number: 05-5200
Grant of Rights Date: 2007-09-07
Certificate Number: 2903
Exemption from compulsory licensing: Yes
Expiry date for exemption from compulsory licensing: 2009-09-07
Date rights surrendered: 2015-07-27

Variety Description

Variety used for comparison: 'Tricolor'

Summary: 'Sweet Caroline Green Yellow' has weaker stem anthocyanin colouration than 'Tricolor'. The upper side of the leaf of 'Sweet Caroline Green Yellow' has a primary colour of dark green to brown green with a secondary colour of light green while in 'Tricolor' the primary colour is brown green with secondary colours of grey and violet.


PLANT: vegetatively propagated perennial grown as an annual, mounding to spreading growth habit, medium degree of branching

STEM: medium green, absent or very weak anthocyanin colouration, absent or weak glaucosity, absent or very sparse pubescence, medium thickness, smooth shape

LEAF: alternately arranged, simple type, reniform to palmately lobed shape, acute to acuminate apex, truncate base, lobed margin, absent to very sparse pubescence on upper and lower side, absent to very weak glaucosity on upper side, dark green to brown green (RHS 137A/B) with secondary colour of light green (RHS 145B/C) on upper side, brown green (RHS 146B) lower side, variegation present, petiole present, absent or very weak anthocyanin colouration of petiole

Origin & Breeding History: 'Sweet Caroline Green Yellow' is derived from the open pollination of the Ipomoea batatas variety 'Okinawa' during November 2002 in Kona, Hawaii, USA. 68 seed were collected from this cross and brought to North Carolina State University and assigned experimental designation NC2626 in the winter of 2003. All seed were planted in the greenhouse in the Spring of 2003 and evaluated. A single seedling was selected and designated NC2626-2ORN based on foliage colour, leaf shape, growth habit, flowering ability and plant vigour.

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 table for 'Sweet Caroline Green Yellow' with reference variety 'Tricolor'

Leaf colour (RHS)

  'Sweet Caroline Green Yellow' 'Tricolor'
upper side - primary 137A/B 146A
upper side - secondary 145B/C 156D and N78C/D
lower side 146B 191B

Click on image for larger view
Sweet Caroline Green Yellow
Sweet Potato: 'Sweet Caroline Green Yellow (left) with reference variety 'Tricolor' (right)

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