AAC Aberdeen is a semi-leafless, yellow cotyledonary field pea (Pisum sativum L.) cultivar developed at Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, AB, Canada. It has a maturity of 98days, 1000-seed weight of 243g, and a lodging score of 3.3 on the scale of 1–9. The seed crude protein content of AAC Aberdeen is 20.1%. AAC Aberdeen is resistant to powdery mildew (caused by Erysiphe pisi D.C.) and moderately susceptible to mycosphaerella blight (caused by Mycosphaerella pinodes) and Fusarium root rot (caused by Fusarium avenaceum (Fr.) Sacc.).
Field pea (Pisum sativum L.) is the most widely grown pulse crop in Canada, and Canada has been leading the field pea production and export in the world since middle of 1990s (Pulse Canada 2021). Developing improved field pea varieties for Canadian pulse producers is the mandate of the field pea breeding program of Lacombe Research and Development Centre (LRDC), Agriculture and Agri-Food Canada (AAFC). In this article, we describe AAC Aberdeen, a yellow field pea variety registered on 14 April 2019 at the Variety Registration Office of Canadian Food Inspection Agency. The registration number of AAC Aberdeen was 8720.
Pedigree and breeding methods
AAC Aberdeen was developed from the cross Agassiz//Polstead/CDC715S-4. Agassiz was a yellow field pea variety developed at AAFC (Bing et al. 2006). Polstead, a registered yellow pea variety in Canada, was developed by Innoseeds B.V., Vlijmen, The Netherlands. CDC715S-4, derived from the cross 92-46Y-PMR-1Y/MP1566, was a yellow pea breeding line developed at the Crop Development Centre, University of Saskatchewan. The breeding method for AAC Aberdeen was pedigree selection in combination with a modified single-seed descent for generation advance.
The cross Agassiz//Polstead/CDC715S-4 was made in the greenhouse in the winter of 2006/2007 at AAFC LRDC. The F1 generation was grown in the field in Lacombe, AB in the summer of 2007 and harvested in bulk. The F2 generation was grown in the field in 2008 in Lacombe, AB. Two pods per plant were harvested from a total of 150 plants. The F3 generation was grown in a winter nursery in Brawley, CA, USA from November 2008 to March 2009, and two to four pods per plant were harvested from a total of 133 individual plants. Two seeds from each of the harvested plant were planted into the F4 nursery in Lacombe, AB in the summer of 2009. One pod was harvested from each plant from a total of 224 F4 plants. The F5 generation was grown in the winter nursery in Brawley, CA, USA in the 2009/2010 winter and a total of 81 individual plants were harvested. In the summer of 2010, the seeds of harvested plants from the F5 generation were bulk-planted in the F6 nursery in the field in Lacombe, AB, and 256 single plants were harvested. The harvested seeds from each plant were kept until 2012 and planted in 1m2 plot in the field in Lacombe, AB, and a total of 128 lines were selected on the basis of visual evaluation of maturity, pod canopy, and lodging resistance. The selected lines were evaluated in replicated preliminary yield tests in 2013 in Lacombe, AB. One of the lines, P0730-118, in the preliminary yield test-3 was the top yielder (4470kgha−1) in the test and yielded 10% higher than the check variety Agassiz. Line P0730-118 was advanced to the multilocation yield test Net-1 in 2014 at six locations (Barrhead, DePauw, AAFC Lacombe, St. Albert, and Vegreville in Alberta and Melfort, SK). In the Net-1 test, P0730-118 was the top yielder (8059kgha−1) and yielded 13% higher than Agassiz. It had a maturity of 102days, a lodging score of 4.1 on the scale of 1–9, and 1000-seed weight (TSW) of 238g. P0730-118 was selected as a candidate for Western Canada Field Pea Cooperative Variety Registration Test (Pea COOP Test). It was planted in two 1m × 15m strips in the field in Lacombe, AB in 2015 for seed multiplication and purification by roguing off-type plants. Line P0730-118 was entered into the 2016 Pea COOP Test and grown at 15 locations. The test locations were Sutherland, Saskatoon, Scott, Limerick, Swift Current, Melfort, Kamsack, and Indian Head in Saskatchewan; Brooks, Barrhead, Morinville, Vegreville, and Lacombe in Alberta; Brandon, MB; and Fort St. John, BC. Line P0730-118 was the top yielder (4847kgha−1) among the first-year Pea COOP Test entries. It was tested in 2017 Pea COOP Test and grown at the above locations. It was recommended for registration by the Prairie Recommending Committee for Pulse and Special Crops in 2018 on the basis of its performance in the 2016–2017 Pea COOP Tests. Line P0730-118 was registered as variety AAC Aberdeen at the Variety Registration Office of Canadian Food Inspection Agency on 14 April 2019.
AAC Aberdeen yielded 4357kgha−1 on the average over 23 location-years (Table 1), 4% higher than the check cultivar CDC Amarillo and 6% higher than AAC Lacombe. AAC Aberdeen had maturity of 98days and a preharvest lodging score of 3.3 on a 1–9 scale, similar to the check cultivars.
Agronomic performance, seed quality, and disease resistance of AAC Aberdeen and the check cultivars in the 2016–2017 Field Pea Cooperative Registration Test.
AAC Aberdeen was semi-leafless and has determinate growth. The plant height of AAC Aberdeen was 89cm. It had white flowers, yellow cotyledons, and opaque seed coat. The seed size of AAC Aberdeen, represented with TSW, was 243g, significantly larger than the seed size of CDC Amarillo, but significantly smaller than that of AAC Lacombe (Table 1). The seed shape of AAC Aberdeen was slightly less spherical than that of the check cultivars. AAC Aberdeen had a seed coat breakage of 11%, similar to the check cultivars. AAC Aberdeen had a seed crude protein content of 20.1%, similar to the check cultivar AAC Lacombe, but 1% lower than CDC Amarillo.
As part of the Pea COOP Tests, AAC Aberdeen was evaluated for its reactions to mycosphaerella blight (caused by Mycosphaerella pinodes (Berk. & Blox.) Vestergr.) in disease nurseries in Sutherland, Saskatoon, SK, Morden, MB, and Lethbridge, AB in 2016 and 2017 at a total of six location-years, to Fusarium root rot (predominantly caused by Fusarium avenaceum (Fr.) Sacc.) in Lethbridge, AB in 2017, and to powdery mildew in the disease nursery in Morden, MB in 2016. AAC Aberdeen was moderately susceptible to mycosphaerella blight but resistant to powdery mildew, similar to the check cultivars. It was also moderately susceptible to Fusarium root rot, but slightly less susceptible than CDC Amarillo (Table 1).
Maintenance and distribution of pedigreed seed
Breeder seed of AAC Aberdeen was derived from a single line in the F9 generation, and is maintained at AAFC Research Farm, Indian Head, SK S0G 2K0, Canada. Exclusive rights for the production and sale of the pedigreed seed for commercialization have been awarded to Alliance Seeds Corp. (2400-333 Main Street, Winnipeg, MB R3C 4E2, Canada).
The development of AAC Aberdeen was funded by Alberta Pulse Growers Commission, Saskatchewan Pulse Grower Association, and the AAFC Agri-Science Cluster Program of Growing Forward 1 and Growing Forward 2. The authors would like to express their gratitude to Mr. Cecil Vera, Dr. Debra McLaren, Dr. Yantai Gan, and Mrs. Lorna Lundberg of AAFC for evaluating the performance of AAC Aberdeen in Melfort, SK, Brandon, MB, Swift Current, SK, and Lacombe, AB, respectively, in the development of AAC Aberdeen.
All data supporting the findings of this study are the property of the Government of Canada, which can be accessed under the data access policy of the Canadian Government.