Optimum

Oat

Denomination: 'Optimum'
Botanical Name: Avena sativa
Applicant/Holder: Agriculture & Agri-Food Canada, Ottawa
Ottawa Research and Development Centre
Room 1093A - 960 Carling Avenue
Ottawa, Ontario
K1A 0C6
Canada
Breeder: Weikai Yan, Agriculture & Agri-Food Canada, Ottawa, Ontario
Agent in Canada: Agriculture & Agri-Food Canada
Office of Intellectual Property and Commercialization
6000 C&E Trail
Lacombe, Alberta
T4L 1W1
Canada
Tel: (403) 782-8126
Application Date: 2012-06-12
Application Number: 12-7634
Grant of Rights Date: 2014-08-25
Certificate Number: 4858
Grant of Rights Termination Date: 2032-08-25

Variety Description

Varieties used for comparison: 'Manotick' and 'Sherwood'

Summary: The leaf colour of 'Optimum' is dark green whereas it is medium green on 'Sherwood'. The flag leaves of 'Optimum' are shorter than those of 'Manotick'. 'Optimum' heads out later than 'Manotick' and 'Sherwood'. The attitude of the branches of the panicle of 'Optimum' are erect with a less than 30 degree angle between the rachis and the dominant branch whereas those of 'Manotick' and 'Sherwood' have semi-erect branches with 30 to 45 degree angles between the rachis and dominant branch. At maturity, the lemma of 'Optimum' is reddish-brown to grey whereas it is yellow on 'Manotick' and white on 'Sherwood'. The lemma of 'Optimum' has a medium tendency to be awned whereas it is absent to very weak on 'Sherwood'. 'Optimum' is resistant to moderately resistant to crown rust (Puccinia coronata) whereas 'Manotick' is susceptible and 'Sherwood' is highly susceptible.

Description:

YOUNG PLANT (5-9 tiller stage): erect juvenile growth habit, absent to very sparse pubescence of lower leaf sheath and blade

LEAF (at booting stage): dark green, absent to very sparse pubescence of the margins, medium intensity of glaucosity, medium frequency of plants with recurved flag leaves, medium density of pubescence/hairiness above and below upper culm node

PANICLE (just after heading): equilateral/symmetrical orientation, medium density
PANICLE BRANCHES: erect attitude, less than 30 degree angle between the rachis and dominant side branch, few hairs or spines on lowest panicle node
SPIKELET: medium glaucosity of glumes, semi-abscission separation, semi-nodding attitude
RACHILLA: medium length between primary and secondary florets, absent or very short grooves, sparse pubescence
LEMMA: weak glaucosity, medium overlap on palea, reddish brown to grey at base at maturity, absent to very sparse pubescence on the lateral and dorsal surfaces, medium tendency to be awned

KERNEL (primary kernels from upper spikelets): hulled, no basal hairs, cream to light brown, two to three grains per spikelet, dense pubescence
SCUTELLUM: round at tip, medium-sized

AGRONOMIC CHARACTERISTICS: spring type, good resistance to lodging
DISEASE RESISTANCE: resistant to moderately resistant to crown rust (Puccinia coronata)

Origin & Breeding History: 'Optimum' (experimental designation OA1228-1) arose from the cross OA1031-2/07836-2-5-2-1a-4 made in 2001 at the Agriculture and Agri-Food Canada Eastern Cereal and Oilseed Research Centre in Ottawa, Ontario using a pedigree breeding method. It was first screened for yield in the 2006 'Home Test' as 08589-4-4-b-2 at the Central Experimental Farm in Ottawa and then evaluated as OA1228-1 in 'Preliminary Tests' at five locations across eastern Canada in 2007. Since 2008, 'Optimum' has been evaluated in formal variety registration tests conducted at several locations across Canada.

Tests & Trials: Tests and trials for 'Optimum' were conducted by Agriculture and Agri-Food Canada at the Eastern Cereal and Oilseed Research Centre, Ottawa, Ontario during the summers of 2011 and 2012. Plots consisted of 4 replicates/variety with 4 rows/replicate, 3.6 metres in length, spaced approximately 0.225 metres apart between replicates.


Comparison tables for 'Optimum' with reference varieties 'Manotick' and 'Sherwood'

Flag leaf length (cm)

  'Optimum' 'Manotick' 'Sherwood'
mean 2011 15.3 16.8 16.4
std. deviation 3.17 2.15 2.76
mean 2012 14.1 16.8 16.5
std. deviation 2.63 4.13 3.52

Days to heading

  'Optimum' 'Manotick' 'Sherwood'
mean 67 60 62

Click on image for larger view
Optimum
Oat: 'Optimum' (centre) with reference varieties, 'Sherwood' (left) and 'Manotick' (right)

Click on image for larger view
Optimum
Oat: 'Optimum' (centre) with reference varieties, 'Manotick' (left) and 'Sherwood' (right)

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