AAC Clyde

Oat

Variety Description

Varieties used for comparison: 'AAC Richmond' and 'CDC Orrin'

Summary: At the 5 to 9 tiller stage, the juvenile growth habit of 'AAC Clyde' is intermediate between semi-erect and semi-prostrate whereas the juvenile growth habit of 'CDC Orrin' is semi-erect. The pubescence on the lower leaf blade of 'AAC Clyde' is absent to very sparse whereas it is of medium density for 'CDC Orrin'. At booting, the glaucosity on the leaves of 'AAC Clyde' is of medium intensity whereas it is strong for 'CDC Orrin'. The pubescence on the stem above and below the upper culm node of 'AAC Clyde' is absent to very sparse and sparse, respectively, whereas the pubescence above and below the culm node for 'CDC Orrin' is of medium density and medium to dense for 'AAC Richmond'. 'AAC Clyde' heads later than 'CDC Orrin'. Shortly after heading at the green stage, 'AAC Clyde' has a shorter panicle than that of 'AAC Richmond'. At maturity, the lower glume of 'AAC Clyde' is shorter than that of 'CDC Orrin'. The lemma of 'AAC Clyde' is yellow whereas it is white for the reference varieties. The tendency of the lemmas to be awned on 'AAC Clyde' is absent to very weak whereas the lemmas on the reference varieties have a very strong tendency to be awned.

Description:

PLANT: hulled spring type, medium frequency of plants with recurved flag leaves at booting

SEEDLING: juvenile growth habit is intermediate between semi-erect and semi-prostrate

LOWER LEAF: absent to very sparse pubescence on sheath and blade at 5 to 9 tiller stage
LEAF (AT BOOTING): medium green, absent to very sparse pubescence on margin of leaf below flag leaf, medium intensity of glaucosity at green stage
FLAG LEAF: medium length and width

STEM: absent to very sparse pubescence below upper culm node, sparse pubescence above upper culm node

PANICLE (SHORTLY AFTER HEADING): medium length, equilateral/symmetrical orientation of branches, medium density, horizontal attitude of branches, less than 30 degrees angle between rachis and dominant side branch
LOWEST PANICLE NODE: few hairs or spines
SPIKELET: semi-abscission separation of lower florets, semi-nodding attitude, two grains
RACHILLA: medium length between primary and secondary florets, absent to very short grooves, very dense pubescence
GLUME: medium glaucosity, medium length and width
LEMMA: medium glaucosity, small extent of lateral overlap on palea, yellow at maturity, absent to very sparse pubescence of lateral and dorsal surfaces, absent to very weak tendency to be awned

KERNEL (PRIMARY KERNELS FROM UPPER SPIKELETS): medium length and width, basal hairs absent, cream colour
SCUTELLUM: pointed tip, medium sized
GROAT: medium density of pubescence

AGRONOMIC CHARACTERISTICS: fair resistance to lodging

Origin & Breeding History: 'AAC Clyde' (experimental designations 09W16 and OA1426-2) originated from the cross made between MN08261 (female parent) and 'AAC Richmond' (male parent) at the Agriculture and Agri-Food Canada Ottawa Research and Development Centre in Ottawa, Ontario in November of 2009. Developed using a modified single seed descent method, the resulting progeny were advanced to the F4 generation in the greenhouses from 2009 to early 2010. About 380 seeds were planted into cones in the F2 and F3 generations and 200 F4 panicle-hills grown in the field in 2011. Ten hills were visually selected at the F4:5 generation and tested in the 2012 Observation Nursery. Based on agronomic traits and grain quality, seven of the 10 F4:6 lines were individually harvested and advanced to the 2013 Ottawa Research and Development Centre Home Test conducted at three locations in Eastern Canada and to the 2014 Ottawa Research and Development Centre oat preliminary test conducted at 10 locations across Canada. A single F4:7 line, designated as OA1426-2, was selected for further testing in the Quebec oat registration trials from 2015 to 2017. In 2014, 50 F8 panicles were randomly selected from a seed plot and grown as 50 hills in 2015. Due to a late planting, eight hills were individually harvested to represent the new variety and regrown in 2016. The purification and seed increase was repeated in 2017 and five of the 8 lines, with similar architecture and crown rust resistance, were bulked in the 2018 yield trials and used to produce breeder seed in 2018 and 2019. Selection criteria included yield, plant height, lodging resistance, crown rust resistance, and quality such as kernel weight, test weight, groat, oil, protein and beta-glucan content.

Tests & Trials: The comparative trials of 'AAC Clyde' were conducted during the 2018 and 2019 growing seasons at the Agriculture and Agri-Food Canada, Ottawa Research and Development Centre in Ottawa, Ontario. Plots consisted of four replications arranged in a RCB design with each plot consisting of 6 rows measuring 3.8 metres long with a row spacing of 18 cm. The planting density was 330 plants per metre square. For each variety, measured characteristics were based on a minimum of 10 measurements in 2018 and 20 measurements in 2019 except for plant heights in 2018 that were based on 30 measurements. Mean differences were significant at the 5% probability level based on LSD values.

Comparison tables for 'AAC Clyde' with reference varieties 'AAC Richmond' and 'CDC Orrin'

Days to heading (number of days from planting to 50% of heads fully emerged)

Panicle length (cm)

Lower glume length (mm)

Click on image for larger view

Oat: 'AAC Clyde' (right) with reference varieties 'CDC Orrin' (centre) and 'AAC Richmond' (left)