SP23

Potato

Variety Description

Varieties used for comparison: 'Atlantic' and 'Snowden'

Summary: 'SP23' matures late while the reference varieties mature mid-season. The stem of 'SP23' has absent or very weak anthocyanin colouration while it is weak to medium in 'Atlantic'. 'SP23' has a medium degree of swelling of the nodes while it is low in the reference varieties. The leaf of 'SP23' is medium to dark green while it is light to medium green in 'Atlantic'. 'SP23' has medium sized lateral leaflets while they are large in 'Snowden'. The depth of the veins of the terminal and lateral leaflets of 'SP23' is shallow while they are moderate in 'Atlantic'. 'SP23' and 'Atlantic' have a red-violet corolla colour while it is white in 'Snowden'. The intensity of the anthocyanin colouration on the inner surface of the corolla of 'SP23' is weak while it is medium in 'Atlantic'. 'SP23' has a narrow cylindrical shaped light sprout while it is ovoid in the reference varieties. The anthocyanin colouration at the base of the light sprout of 'SP23' is strong while it is weak in 'Snowden'. 'SP23' has absent or low proportion of blue in the anthocyanin colouration at the base of the light sprout while it is medium in 'Atlantic'. The base of the light sprout of 'SP23' has medium pubescence while it is sparse in 'Snowden'. The light sprout tip of 'SP23' has strong anthocyanin colouration while it is weak in 'Atlantic' and absent to weak in 'Snowden'. 'SP23' has medium pubescence of the tip of the light sprout while it is dense in 'Atlantic' and absent or very sparse in 'Snowden'. 'SP23' has a medium number of root tips on the light sprout while it is few in 'Atlantic'.

Description:

PLANT: semi-upright to spreading growth habit, intermediate type foliage structure

STEM: absent to very weak anthocyanin colouration, thin to medium main stem, medium swelling at nodes

LEAVES: medium to dark green, intermediate silhouette, absent or very weak anthocyanin colouration on upper side of rachis and petiole, absent or very low frequency of coalescence, shallow depth of veins, weak to medium waviness of margin, dull to medium glossiness of upper side, pubescence on blade, weak to medium presence of secondary leaflets
TERMINAL LEAFLET: medium ovate, acuminate tip, cordate base
LATERAL LEAFLET: medium size, narrowly ovate, acuminate tip, cordate base

INFLORESCENCE: medium flowering profusion, medium size
FLOWER BUD: medium persistence, medium intensity of anthocyanin colouration
COROLLA: red-violet, weak anthocyanin colouration on inner surface, large size, no prominence of star
PEDUNCLE: absent to very weak anthocyanin colouration

TUBER: elliptical, white flesh with no secondary colour
TUBER EYES: shallow depth, evenly distributed, eyebrows not prominent
TUBER SKIN: light beige, white at base of eye, rough texture

LIGHT SPROUT: medium size, narrow cylindrical shape, medium number of root tips, short lateral shoots
LIGHT SPROUT BASE: strong anthocyanin colouration, no blue in anthocyanin colouration, medium pubescence
LIGHT SPROUT TIP: smaller in size than base, intermediate habit, strong anthocyanin colouration, medium pubescence

Origin & Breeding History: 'SP23' is the result of the cross of F100-1 x Q155-3 made in 1989 in Ithaca, New York, USA. An initial population of 45,000 seedling tubers were planted and evaluated in Alliston, Ontario in 1991. Clones were selected and planted as single hills in 1992 with subsequent selections planted as 5 hills in 1993 and then as 20 hills in 1994. Selection criteria included tuber quality, adaptation, yield, resistance and processing traits.

Tests & Trials: Trials were conducted in Alliston, Ontario in 2008. Plots consisted of 2 rows, with a row length of 6 meters, a plant spacing of 30 cm within the row and a row spacing of 1 meter. There were 30 plants per plot. There were two replicates.

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Potato: 'SP23' (centre) with reference varieties 'Atlantic' (left) and 'Snowden' (right)