Isle of Jura

Potato

Variety Description

Varieties used for comparison: 'Navan' and 'Yukon Gold'

Summary: The lightsprout of 'Isle of Jura' is broad cylindrical in shape while it is ovoid in 'Navan' and spherical in 'Yukon Gold'. The base of the lightsprout of 'Isle of Jura' has weak intensity of anthocyanin while it is strong on the reference varieties. The plants of 'Isle of Jura' have semi-upright growth habit while it is upright on the reference varieties. The stem of 'Isle of Jura' has absent or very low extent of anthocyanin colouration while it is medium to high in 'Navan' and low in 'Yukon Gold'. The outline size of the leaves of 'Isle of Jura' is large while it is medium for the reference varieties. The frequency of flowers of 'Isle of Jura' is medium while it is high for the reference varieties. The inner side of the corolla of 'Isle of Jura' has absent or very low anthocyanin colouration with an absent or low proportion of blue while 'Navan' has medium anthocyanin colouration with medium proportion of blue and 'Yukon Gold' has high anthocyanin colouration with medium proportion of blue. The plants of 'Isle of Jura' has medium to late maturity while the plants of 'Navan' have very late maturity. The tuber of 'Isle of Jura' is long oval in shape while the tubers of the reference varieties are round. The tubers of 'Isle of Jura' have medium yellow flesh while the tubers of 'Navan' have white flesh and the tubers of 'Yukon Gold' have dark yellow flesh.

Description:

PLANT: semi-upright growth habit, intermediate type foliage structure, medium to late maturity

STEM: absent or very low extent of anthocyanin colouration

LEAVES: large size, intermediate openness, weak presence of secondary leaflets, medium green, absent or very low extent of anthocyanin colouration on midrib of upper side, absent or very weak intensity of anthocyanin colouration on midrib of upper side, absent or very low frequency of coalescence of terminal and lateral leaflets
SECOND PAIR OF LATERAL LEAFLETS: medium, narrower than there are long
LEAFLETS: medium waviness of margin, shallow depth of veins, glossy on upper side

INFLORESCENCE: medium frequency of inflorescences per plant, medium size, absent or very low extent of anthocyanin colouration on peduncle
FLOWER BUD: absent or very low extent of anthocyanin colouration
COROLLA: medium size, absent or very weak intensity of anthocyanin colouration on inner side, absent or low proportion of blue in anthocyanin colouration on inner side, absent or low extent of anthocyanin colouration on inner side

TUBER: long oval shape, medium yellow coloured flesh
TUBER EYES: very shallow depth
TUBER SKIN: light beige, white at base of eye

LIGHT SPROUT: medium size, broad cylindrical shape, medium number of root tips, short lateral shoots
LIGHT SPROUT BASE: weak anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration, very dense pubescence
LIGHT SPROUT TIP: small size in relation to base, intermediate habit, weak anthocyanin colouration, sparse density of pubescence.

Origin & Breeding History: The variety 'Isle of Jura' (experimental number 90 G28-5) was initiated by controlled pollination between 'Navan X 81C117-13' and 'S62/47/1 x Maris Piper' conducted in 1990 in Cambridge, England. True seed was sown to produce a seedling tuber at Cambridge. Selection was initially made on single plants grown in Scotland using agronomic traits followed by several years of trials. Criteria used in the selection process included yield, disease resistance to common scab, blackleg, virus, nematodes and storage rots.

Tests & Trials: Trials of 'Isle of Jura' were conducted during the summer of 2010 in Albany, Prince Edward Island. There were 4 replicates, with a row length of 7.62 meters and a row spacing of 0.914 meters. Plants were spaced 0.305 meters apart. There were 120 plants per variety in the trial.

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Potato: 'Isle of Jura' (left) with reference varieties 'Yukon Gold' (centre) and 'Navan' (right)