Rosemarie

Potato

Variety Description

Variety used for comparison: 'All Red'

Summary: The lightsprout of 'Rosemarie' is broad cylindrical in shape whereas the lightsprout of 'All Red' is ovoid. The plant of 'Rosemarie' is shorter than that of 'All Red'. The foliage structure of the plant of 'Rosemarie' is a leaf type whereas the foliage structure is intermediate between leaf and stem types for 'All Red'. The upper side of the leaf of 'Rosemarie' is medium green with a medium extent of anthocyanin colouration on the midrib whereas the leaf of 'All Red' is dark green with a high extent of anthocyanin colouration on the midrib. The extent of anthocyanin colouration of the flower bud is absent or very low for 'Rosemarie' whereas the extent is medium for 'All Red'. The extent of anthocyanin colouration of the peduncle is low for 'Rosemarie' whereas the extent is high for 'All Red'. The anthocyanin colouration of the inner side of the corolla of 'Rosemarie' is of absent or very low extent and absent or very weak intensity whereas the anthocyanin colouration is of very high extent and strong intensity for 'All Red'. The tuber of 'Rosemarie' is long in shape whereas the tuber of 'All Red' is oval to long oval in shape.

Description:

LIGHTSPROUT: medium to large, broad cylindrical shape, medium number of root tips, short lateral shoots
LIGHTSPROUT BASE: very strong intensity of anthocyanin colouration, medium to high proportion of blue in anthocyanin colouration, sparse pubescence
LIGHTSPROUT TIP: small in relation to base, closed habit, strong intensity of anthocyanin colouration, sparse to medium density of pubescence

PLANT: foliage structure is leaf type where foliage is closed and stems are not or hardly visible, semi-upright growth habit, matures mid-season to late

STEM: medium to high extent of anthocyanin colouration along entire stem

LEAF: outline is medium size, openness is intermediate between closed and open, medium green on upper side, medium extent and medium to strong intensity of anthocyanin colouration on midrib of upper side, medium presence of secondary leaflets, absent or very low frequency of coalescence of terminal and lateral leaflets
SECOND PAIR OF LATERAL LEAFLETS: small to medium size, leaflet is narrower than long
LEAFLET: absent or very weak waviness of margin, shallow to medium depth of veins, medium glossiness of upper side, pubescent blade at apical rosette

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

TUBER: long shape, red flesh
TUBER EYE: shallow depth, red at base
TUBER SKIN: red

Origin & Breeding History: The variety 'Rosemarie' originated from a cross conducted in 2003 as part of a private breeding program at the Karsten Ellenberg breeding facility in Barum, Germany. The cross was made between ('La Ratte' × 'Baltica') as the female parent and ('Highland Burgundy Red' × 'Huamantango') as the male parent. The resultant seed was planted in a greenhouse in 2004 and from these, tubers were harvested and planted in the field in Barum, Germany in 2005. The variety was selected in 2005 for its agronomic characteristics and resistance to various diseases.

Tests & Trials: The comparative trial for 'Rosemarie' was conducted during the growing season of 2014 in Drummond, New Brunswick. The trial consisted of a single row with 60 plants spaced 0.3 metres apart for each variety. The distance between rows within the trial was 0.9 metres. Observations and measurements were taken from 10 plants of each variety. Mean differences were significant at the 5% probability level based on a paired Student's t-test.

Comparison table for 'Rosemarie' with reference variety 'All Red'

Plant height (cm)

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Potato: 'Rosemarie' (left) with reference variety 'All Red' (right)