BY Rundle XT

Soybean

Variety Description

Varieties used for comparison: 'DKB0009-89', 'DKB006-29' and 'Vidar R2X'

Summary: When 50% of the flowers are open, the branching attitude of 'BY Rundle XT' is semi-erect whereas it is semi-erect to horizontal for 'DKB006-29'. When 95% of the pods are ripe, the plants of 'BY Rundle XT' are shorter than the plants of the reference varieties. The intensity of brown colour on the pod of 'BY Rundle XT' is of medium intensity whereas it is dark brown for 'DKB006-29' and 'Vidar R2X'. The plants of 'BY Rundle XT' mature earlier than the plants of the reference varieties. The seed of 'BY Rundle XT' has an elongate flattened shape whereas it is spherical flattened for 'DKB009-89' and 'DKB006-29' and spherical for 'Vidar R2X'. The seed of 'BY Rundle XT' is medium in size whereas the seed is small for 'Vidar R2X'.

Description:

HYPOCOTYL: medium intensity of anthocyanin colouration

PLANT: oilseed type, indeterminate growth type, semi-erect branching attitude, tawny pubescence on middle third of main stem, begins flowering early to mid-season, matures early

LEAF: pointed ovate lateral leaflet, medium green colour

FLOWER: violet

POD: medium brown
SEED: medium size, elongate flattened, yellow ground colour of testa
HILUM: black

REACTION TO PHOTOPERIOD: sensitive

Origin & Breeding History: 'BY Rundle XT' (experimental designation C4M20366XT) originated from a cross between the variety 'Akras R2' and the line C411XK550.K01.K001 conducted in 2013 in Saint-Hyacinthe, Quebec. From 2014 to 2016, four generations were self-pollinated from the F1 to F4 generations in Puerto Rico, USA using the single seed descent method. Seedlings were then selected for uniformity in San Ramon, Chile, during the winter of 2015 to 2016, and replicated plots were assessed from 2016 to 2020 in Saint-Hyacinthe, Quebec. In 2017, the F5 generation, grown in Saint-Hyacinthe, Quebec, underwent selections based on a visual assessment of the resistance to lodging, yield and maturity date. 'BY Rundle XT' was identified at the F5 generation in 2017. In 2019, 25 lines were selected and bulked to produce the breeder seed.

Tests & Trials: The comparative trials of 'BY Rundle XT' were conducted at a production farm located in Saint-Simon, Quebec during the 2021 and 2022 growing seasons. The trial was arranged in a RCB design with four replicates per variety. Each 6 square metre plot consisted of 4 rows, each 4.5 metres long with a row spacing of 0.38 metres apart. The seeding density was such that is resulted in 40 plants per variety per square metre. For each variety, 20 measurements were taken to determine plant height. Mean differences are significant at the 5% probability level based on a Tukey test.

Comparison tables for 'BY Rundle XT' with reference varieties 'DKB0009-89', 'DKB006-29' and 'Vidar R2X'

Plant height (cm)

Time of maturity (number of days from planting to maturity)

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Soybean: 'BY Rundle XT' (left) with reference varieties 'DKB0009-89' (centre left), 'DKB006-29' (centre right) and 'Vidar R2X' (right)

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Soybean: 'BY Rundle XT' (top left) with reference varieties 'DKB0009-89' (top right), 'DKB006-29' (bottom left) and 'Vidar R2X' (bottom right)

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Soybean: 'BY Rundle XT' (centre bottom) with reference varieties 'Vidar R2X' (bottom), 'DKB006-29' (top) and 'DKB0009-89' (centre top)