CDC WM-2

Bean

Variety Description

Varieties used for comparison: 'CDC Minto', 'Winchester' and 'CDC WM-1'

Summary: 'CDC WM-2' has a slow darkening seed coat whereas those of 'Winchester' and 'CDC Minto' are regular darkening. 'CDC WM-2' has an indeterminate growth habit whereas 'CDC WM-1' has a determinate growth habit. The terminal leaflet shape of 'CDC WM-2' is triangular whereas is it rhombic on 'CDC Minto' and rhombic to rounded on 'Winchester'. 'CDC WM-2' flowers very early whereas 'CDC Minto' flowers early. The inflorescences of 'CDC WM-2' are positioned both in and above the foliage whereas they are positioned predominantly in the foliage on 'CDC Minto' and 'Winchester'. The pods of 'CDC WM-2' have a medium degree of curvature whereas the pods of 'CDC Minto' and 'Winchester' have weak curvature and 'CDC WM-1' has strong curvature. 'CDC WM-2' is resistant to anthracnose race 73 whereas 'CDC WM-1' is moderately susceptible, 'CDC Minto' is susceptible and 'Winchester' is highly susceptible.

Description:

PLANT: dwarf growth type, indeterminate growth habit, erect attitude of branches

LEAF: medium green, medium rugosity
TERMINAL LEAFLET: small size, triangular shape, medium length tip

FLOWER: flowers very early, positioned both in and above the foliage at full flowering, medium sized bracts, white standard and wings

POD: medium length and width, medium green ground colour, medium degree of concave curvature, long beak, absent or very weak curvature of beak, violet secondary colour, dense flecks of secondary colour, moderate constrictions at dry stage
SEED: pinto type, rectangular shape in longitudinal section, medium elliptic shape in cross section, two coloured, main colour buff, secondary colour brown distributed on entire grain in a spotted pattern

DISEASE REACTION: resistant to anthracnose race 73

Origin & Breeding History: 'CDC WM-2' was developed at the Crop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan. The pedigree is Minto/3/Minto/Weihing//Minto/OAC Rex/4/1533-15*3/6/Minto*2/5/1533-15/4/Minto/3/Minto/Weihing//Minto/OAC Rex with the final cross being made in 2003. The F1 plants were grown indoors and selected for common bacterial blight tolerance using molecular marker technology. The F2 population was space planted in the field in Saskatoon in 2004 and single plants were inoculated with the causal agent for common bacterial blight. Single plants were selected for field tolerance to common bacterial blight, were harvested and selected for pinto bean seed characteristics such as size, shape, seed coat patterning and maintenance of seed coat colour after storage. One square metre microplots of F3 seed from each selected F2 plant were field grown in Saskatoon in 2005 and selected plots were bulk harvested. Once again, the plants were inoculated and selected for tolerance to common bacterial blight, upright, indeterminate growth habit and early maturity. Selected F4 seed was grown again as microplots in the common bacterial blight nursery in Saskatoon in the summer of 2006 and assessed for tolerance to common bacterial blight, maturity, plant architecture and seed characters. Seed from the selected plots was bulked and entered into the Short-season Narrow Row Bean Cooperative test in 2007 and 2008 as 2973CBB.

Tests & Trials: The tests and trials for 'CDC WM-2' were conducted in Saskatoon, Saskatchewan during the summers of 2009 and 2011. Trials consisted of 2 replicates per variety, consisting of 3 rows per replicate, measuring approximately 4.6 metres in length, with a row spacing of approximately 30cm.

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Bean: 'CDC WM-2' (top) with reference varieties 'CDC Minto' (centre top), 'Winchester' (centre bottom) and 'CDC WM-1' (bottom)