Sweet Caroline Green Yellow
|Denomination:||'Sweet Caroline Green Yellow'|
|Botanical Name:||Ipomoea batatas|
North Carolina State University
Office of Technology Transfer
1021 Main Campus Drive
Raleigh, North Carolina
United States of America
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:||
38723 Fingal Line
St. Thomas, Ontario
|Grant of Rights Date:||2007-09-07|
|Exemption from compulsory licensing:||Yes|
|Expiry date for exemption from compulsory licensing:||2009-09-07|
|Date rights surrendered:||2015-07-27|
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|
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