AmaRosa

Potato

Variety Description

Variety used for comparison: 'All Red'

Summary: The lightsprout of 'AmaRosa' is small with sparse pubescence at the base whereas 'All Red' has a medium sized lightsprout with medium pubescence at the base. The waviness of the leaflet margins for 'AmaRosa' is absent or very weak whereas it is weak to medium for 'All Red'. The upper side of the leaflet for 'AmaRosa' is dull whereas the leaflet has medium glossiness for 'All Red'. The extent of anthocyanin colouration of the flower bud of 'AmaRosa' is high whereas it is medium on 'All Red'. 'AmaRosa' has a shorter plant height than that of 'All Red'. The frequency of flowers per plant is medium for 'AmaRosa' whereas it is high on plants of 'All Red'. 'AmaRosa' has small to medium sized inflorescences whereas those of 'All Red' are medium to large. The intensity of anthocyanin colouration on the inner side of the flower corolla is strong for 'AmaRosa' whereas it is medium for 'All Red'. The plants of 'AmaRosa' mature late whereas those of 'All Red' mature early to mid-season. The tubers of 'AmaRosa' have a long to very long shape whereas tubers of 'All Red' have a oval to long-oval shape.

Description:

LIGHTSPROUT: small, ovoid, root tips few in numbers, short lateral shoots
LIGHTSPROUT BASE: very strong intensity of anthocyanin colouration, medium proportion of blue in the anthocyanin colouration, sparse pubescence
LIGHTSPROUT TIP: medium size in relation to base, intermediate habit, medium intensity of anthocyanin colouration, medium pubescence

PLANT: foliage structure is an intermediate type where foliage is half open and stems are partly visible, upright to semi-upright growth habit, late maturity

STEM: high extent of anthocyanin colouration along the entire stem

LEAF: medium outline, intermediate openness, dark green colour, high extent and strong intensity of anthocyanin colouration on the midrib of the upper side
SECOND PAIR OF LATERAL LEAFLETS: medium size, narrower than long width in relation to length
LEAFLETS: medium presence of secondary leaflets, absent or very low frequency of coalescence of terminal and lateral leaflets, absent or very weak waviness of margin, medium depth of veins, dull on upper side, pubescence on blade at apical rosette

INFLORESCENCE: medium frequency per plant, small to medium size, high extent of anthocyanin colouration on peduncle
FLOWER BUD: high extent of anthocyanin colouration
COROLLA: medium size, very high extent and strong intensity of anthocyanin colouration on the inner side, absent or low proportion of blue in the anthocyanin colouration

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

Origin & Breeding History: The variety 'AmaRosa' originated from a cross between PA97B23-2 as the female parent and a mixture of unidentified Red Bulk pollen, made at Oregon State University in 2000. Seed from the cross was sown in the greenhouse in 2000. The resulting tubers were harvested and planted in the field at Madras, Oregon in the 2001. One of the selected progeny was given the designation as 'AmaRosa'. Initial selection criteria included tuber appearance, shape, size, tuber eyes, smooth skin as well as pigmented skin and flesh. Selection criteria in subsequent trials included yield components, quality, disease reaction and chemical characteristics.

Tests & Trials: Trials for 'AmaRosa' were conducted during the 2013 growing season in Drummond, New Brunswick. Each variety plot consisted of 60 plants grown in a single row with a row length of 18.5 metres and a row spacing of 0.9 metres between rows. Plants were spaced 0.30 metres apart. The measured characteristics were based on 10 measurements per variety. Mean differences were significant at the 5% probability level based on a paired Student's t-test.

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

Plant height (cm)

Click on image for larger view

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