Siena

Potato

Variety Description

Varieties used for comparison: 'Paris' and 'Montreal'

Summary: The lightsprout of 'Siena' is medium sized and broad cylindrical in shape while the lightsprout of 'Paris' is small and spherical and that of 'Montreal' is large and ovoid. The lightsprout base of 'Siena' has a medium proportion of blue in anthocyanin colouration whereas those of 'Paris' and 'Montreal' have an absent or low proportion of blue in the anthocyanin colouration. In relation to the base, the lightsprout tip of 'Siena' is medium sized while those of 'Paris' and 'Montreal' are small. The lightsprout tip of 'Siena' has an intermediate habit while those of 'Paris' and 'Montreal' have a closed habit. The plants of 'Siena' have an intermediate to leaf type foliage structure, where the foliage is half open to closed and the stems are partly or hardly visible, whereas those of 'Paris' and 'Montreal' have an intermediate type foliage structure where the foliage is half open and the stems are partly visible. The leaf of 'Siena' has a large outline while those of 'Paris' and 'Montreal' have a medium sized outline. The plants of 'Siena' are taller than those of 'Paris'. The tuber of 'Siena' is oval to long-oval in shape while the tuber of 'Paris' is round to short oval and that of 'Montreal' is short oval.

Description:

LIGHTSPROUT: medium sized, broad cylindrical, medium number of root tips, short lateral shoots
LIGHTSPROUT BASE: strong intensity of anthocyanin colouration, medium proportion of blue in anthocyanin colouration, medium to dense pubescence
LIGHTSPROUT TIP: medium in relation to base, intermediate habit, medium to strong intensity of anthocyanin colouration, dense pubescence

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

STEM: absent or very low extent of anthocyanin colouration

LEAF: large outline, intermediate openness, medium presence of secondary leaflets, medium green upper side, absent or very low extent of anthocyanin colouration on upper side of midrib, absent or very weak intensity of anthocyanin colouration on upper side of midrib, absent or very low frequency of coalescence of terminal and lateral leaflets
SECOND PAIR OF LATERAL LEAFLETS: large to very large, leaflet is narrower than long
LEAFLET: absent or very weak degree of waviness of margin, shallow to medium depth of veins, dull upper side

PEDUNCLE: absent or very low to low extent of anthocyanin colouration
INFLORESCENCE: medium to high frequency per plant, medium sized
FLOWER BUD: low extent of anthocyanin colouration
COROLLA: large
COROLLA (INNER SIDE): absent or very weak intensity of anthocyanin colouration, absent or low proportion of blue in anthocyanin colouration, absent or very low extent of anthocyanin colouration

TUBER: oval to long-oval, light yellow flesh
TUBER EYE: shallow, yellow at base
TUBER SKIN: yellow

Origin & Breeding History: 'Siena' (experimental designation D 06-37-04) originated from a hybridization conducted at the J.P. van Loon breeding station in Dronten, Netherlands in 2005. The cross was made between the variety 'Celine', as the female parent, and the variety 'Delianne', as the male parent. Seed from the cross was planted in a greenhouse in 2006. The resulting tubers were harvested and planted in the field in Dronten, Netherlands in the spring of 2007. The new variety was selected from these progeny in 2007 based on its agronomic characteristics and resistance to various diseases.

Tests & Trials: The comparative trial for 'Siena' was conducted by Global Agri Services Inc. in Central Blissville, New Brunswick during the 2022 growing season. The field trial consisted of a single, 22 metre long row per variety. Each row contained 70 plants spaced 0.3 metres apart with inter-row spacing of 1.1 metres. Measurements were taken from 10 plants, or 10 parts of plants, of each variety. The mean difference was significant at the 5% probability level based on a paired Student's t-test. Lightsprout characteristics were assessed on 10 tubers harvested from the comparative trial and observed approximately 2.5 to 3 months after sprouting was promoted by exposing the tubers to an external agent.

Comparison table for 'Siena' with reference varieties 'Paris' and 'Montreal'

Plant height (cm)

Click on image for larger view

Potato: 'Siena' (right) with reference varieties 'Paris' (left) and 'Montreal' (center)