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Highland Russet


Denomination: 'Highland Russet'
Previously Proposed Denomination: 'A9045-7'
Botanical Name: Solanum tuberosum
Applicant/Holder: University of Idaho
Office of Technology Transfer
875 Perimeter Drive, MS3003
Moscow, Idaho
United States of America
Breeder: Jeffrey C. Stark, University of Idaho, Idaho Falls, United States of America
Agent in Canada: Global Agri Services Inc.
376 New Maryland Highway
New Maryland, New Brunswick
E3C 1E5
Tel: 506-462-9493
Application Date: 2007-03-30(priority claimed)
Application Number: 07-5821
Protective direction granted: 2007-03-30
Grant of Rights Date: 2009-10-31
Certificate Number: 3674
Grant of Rights Termination Date: 2027-10-31

Variety Description

Variety used for comparison: 'Ranger Russet'

Summary: 'A9045-7' has a semi-upright growth habit while 'Ranger Russet' has an upright growth habit. The terminal leaflet tip is acute for 'A9045-7' while it is acuminate for 'Ranger Russet'. 'A9045-7' has very weak anthocyanin colouration of the inner side of the corolla while it is moderate for 'Ranger Russet'. The light sprouts of 'A9045-7' are small with a narrow cylindrical shape while they are large and conical for 'Ranger Russet'.


PLANT: semi-upright growth habit, intermediate type foliage structure
STEM: weak anthocyanin colouration located in the middle, thick, nodes with low swelling

LEAVES: medium green, open silhouette, weak anthocyanin colouration on upper side of rachis and petiole, shallow veins, weak waviness of margin, weak glossiness on upper side, pubescence on leaves of apical rosette, medium presence of secondary leaflets
TERMINAL LEAFLET: medium ovate shape, acute tip, obtuse base, absent or very low frequency of coalescence with lateral leaflets
LATERAL LEAFLET: medium in size, narrowly ovate shape, acute tip, cordate base

INFLORESCENCE: low flowering profusion, small, flower buds are persistent, strong anthocyanin colouration of flower bud
COROLLA: red-violet, medium size, prominant star, very weak anthocyanin colouration of inner side and weak anthocyanin colouration on peduncle

TUBER: oblong
TUBER SKIN: light beige, yellow at base of eye, weak anthocyanin colouration in reaction to light, netted texture
TUBER EYES: shallow, even distribution, slight prominence of eyebrows
TUBER FLESH: white, no secondary colour

LIGHT SPROUT: small, narrow cylindrical shape, medium number of root tips, short lateral shoots
BASE: medium anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration, medium pubescence
TIP: smaller than base in size, closed habit, medium anthocyanin colouration, sparse pubescence

Origin & Breeding History: 'A9045-7' was derived from a sexual hybridization made at the University of Idaho's Aberdeen Research and Extension Center in 1990. 'A9045-7' resulted from a cross between 'Ranger Russet' and 'Russet Legend'. The selection criteria were yield, maturity, tuber appearance and uniformity, specific gravity, resistance to tuber defects, storage fry colour and disease resistance.

Tests & Trials: Trials for 'A9045-7' were conducted in Drummond, New Brunswick in 2007. All entries were planted in single-row plots. Plots consisted of rows 22 meters long with 30 cm in row spacing between plants and spacing between row spacing of 91 cm. Measured characteristics were based on 10 measurements. Colour determinations were made using the 1986 RHS colour chart.

Click on image for larger view
Highland Russet
Potato: 'A9045-7' (left) with reference variety 'Ranger Russet' (right)

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