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Denomination: 'Tenace'
Botanical Name: Solanum tuberosum
Applicant/Holder: Agriculture & Agri-Food Canada, Fredericton
Fredericton Research and Development Centre
850 Lincoln Road, P.O. Box 20280
Fredericton, New Brunswick
E3B 4Z7
Breeder: T. Richard Tarn, Agriculture & Agri-Food Canada, Fredericton, New Brunswick
Agent in Canada: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
107 Science Place
Saskatoon, Saskatchewan
S7N 0X2
Tel: (306) 385-9316
Application Date: 2009-06-18
Application Number: 09-6668
Grant of Rights Date: 2011-03-18
Certificate Number: 4040
Grant of Rights Termination Date: 2029-03-18

Variety Description

Varieties used for comparison: 'Frontier Russet' and 'Russet Burbank'

Summary: 'Tenace' has a semi-upright habit whereas it is upright in 'Frontier Russet' and spreading in 'Russet Burbank'. The plants of 'Tenace' are shorter in height than the reference varieties. 'Tenace' has weak anthocyanin colouration of the stem while it is medium in 'Russet Burbank'. The lateral leaflets of 'Tenace' are medium to large in size while those of 'Frontier Russet' are small to medium. 'Tenace' has medium flowering profusion while it is low in the reference varieties. The tuber shape of 'Tenace' is cylindrical whereas it is oblong in 'Frontier Russet'. The tuber flesh of 'Tenace' is cream whereas it is white in the reference varieties. 'Tenace' has many number of root tips on the light sprout while it is medium on 'Russet Burbank'. 'Tenace' has absent or very sparse pubescence of the base of the light sprout while it is medium in the reference varieties.


PLANT: semi-upright growth habit, leaf type foliage structure

STEM: weak anthocyanin colouration, medium thickness of main stem, absent or very low swelling at nodes

LEAVES: medium green, open silhouette, absent or very low anthocyanin colouration on upper side of rachis, weak anthocyanin colouration of petiole, absent to very low frequency of coalescence, medium to deep depth of veins, weak waviness of margin, medium glossiness of upper side, medium density of pubescence, medium to strong presence of secondary leaflets
TERMINAL LEAFLET: medium ovate, cuspidate tip, cordate base
LATERAL LEAFLET: medium to large size, elliptical, cuspidate tip, cordate base

INFLORESCENCE: medium flowering profusion, medium size
FLOWER BUD: medium to strong persistence, absent or very weak intensity of anthocyanin colouration
COROLLA: white, medium size, medium to strong prominence of star
PEDUNCLE: absent or very weak anthocyanin colouration

TUBER: cylindrical, cream flesh with no secondary colour
TUBER EYES: shallow, evenly distributed, slight prominence of eyebrows
TUBER SKIN: brown, white at base of eye, netted texture

LIGHT SPROUT: medium size, ovoid shape, many root tips, short lateral shoots
LIGHT SPROUT BASE: medium anthocyanin colouration, no blue in anthocyanin colouration, absent or very sparse pubescence
LIGHT SPROUT TIP: equal in size to base, closed to intermediate habit, absent or very weak anthocyanin colouration, dense pubescence

DISEASE RESISTANCE: resistant to golden nematode (Globodera rostochiensis Ro1)

Origin & Breeding History: 'Tenace' (experimental designation 12753-1, F99047 and AR2004-7) originated from a cross between Frontier Russet and F87070, made in 1996 in Fredericton, New Brunswick. Selection criteria were adaptation, tuber type and culinary quality.

Tests & Trials: Trials for 'Tenace' were conducted at Potato Research Centre, Fredericton, New-Brunswick, in 2009. There were two replicates of 30 plants with a plant spacing of 30 cm.

Comparison table for 'Tenace' with reference varieties 'Frontier Russet' and 'Russet Burbank'

Plant height (cm)

  'Tenace' 'Frontier Russet' 'Russet Burbank'
mean 25 41 57
standard deviation 3.29 2.72 3.49

Click on image for larger view
Potato: 'Tenace' (left) with reference varieties 'Russet Burbank' (center) and 'Frontier Russet' (right)

Click on image for larger view
Potato: 'Tenace' (left) with reference varieties 'Frontier Russet' (center) and 'Russet Burbank' (right)

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