AAC Johral
| Denomination: | 'AAC Johral' |
|---|---|
| Previously Proposed Denomination: | 'QSJ-11' |
| Botanical Name: | Lactuca sativa |
| Applicant/Holder: |
Agriculture & Agri-Food Canada Office of Intellectual Property and Commercialization 303 Main Street Floor 5, Rm 511 Winnipeg, Manitoba R3C 3G7 Canada |
| Breeder: |
Sylvie Jenni, Agriculture & Agri-Food Canada, Saint-Jean-sur-Richelieu, Quebec |
| Agent in Canada: |
Foundation for Breeding Lettuce and Leafy Vegetables 316, Rang Saint-André Napierville, Quebec J0J 1L0 Canada Tel: 514-444-7713 |
| Application Date: | 2022-05-17 |
| Provisional Protection:: | 2022-05-17 |
| Application Number: | 22-10928 |
Variety Description
Varieties used for comparison: 'Estival' and 'Prestige'
Summary: The outer leaf of 'AAC Johral' has a transverse narrow elliptic shape whereas the outer leaf of 'Estival' is circular and that of 'Prestige' has transverse broad elliptic shape. At harvest maturity, the stem of 'AAC Johral' is shorter than that of 'Prestige'. At flowering, the plants of 'AAC Johral' are shorter than the plants of 'Estival' and 'Prestige'.
Description:
PLANT: iceberg type, absent or weak axillary sprouting, bolting begins mid to late season under long day conditions, harvest maturity at mid-season
SEEDLING: no anthocyanin colouration, no division of leaf blade at 10 to 12 leaf stage
HEAD: closed head formation with a medium degree of overlapping of upper part of leaves, dense, circular shape in longitudinal section
LEAF: medium to thick, semi-erect attitude at harvest maturity, transverse narrow elliptic shape, no hue of other colour on green outer leaf, moderate to strong intensity of green colouration on outer side of outer leaf, no anthocyanin colouration, weak to medium glossiness on inner side, weak degree of blistering, medium sized blisters, weak degree of undulation of margin, flabellate (fan shaped) venation
INCISIONS OF MARGIN ON APICAL PART OF LEAF: sparse to medium density, shallow
SEED: black seed coat
Origin & Breeding History: 'AAC Johral' (experimental designation 'QSJ-11') originated as a single plant selection using the pedigree method of plant breeding. The female parent was an F6 progeny resulting from the cross between the varieties 'Valley Green' and 'Ithaca'. The male parent resulted from a cross between an F4 progeny (resulting from the cross between the varieties 'Summertime' and 'Eldorado') and an F5 progeny (resulting from a cross between the varieties 'Summertime' and 'Onondaga'). The final cross resulting in the new variety was conducted at the Agriculture and Agri-Food Canada Horticultural Research and Development Centre in Saint-Jean-sur-Richelieu, Quebec in December 2004. The variety was advanced from the F2 to the F9 generation in Sainte-Clotilde and Napierville, Quebec based on 'Vanguard' characteristics, leaf configuration, presence of rib discolouration and tipburn as well as head size, weight, firmness, ribbiness and stem length. One F9 plant was selected in 2012 with subsequent seed evaluation and multiplication conducted in San Joaquin Valley, California, USA. The variety was assessed in replicated plots from 2016 to 2019 with the new variety being designated as 'QSJ-11' at the end of 2019.
Tests & Trials: The comparative trials for 'AAC Johral' were conducted at the JPL Guérin farm, in Sherrington, Quebec during the summers of 2022 and 2023. Both the candidate and reference varieties were sown in the greenhouse and later transplanted into fields of organic soil. Plots were arranged in a RCB design with 3 replications in 2022 and 4 replications in 2023. Each plot contained 60 plants resulting in a total of 180 and 240 plants per variety in 2022 and 2023, respectively. The plots were composed of two rows spaced 35.5 cm and planted in mounds that were 14.6 metres long and 0.91 metres wide. The plants were grown under normal conditions for cultivation with long days (photoperiod between 15 and 16 hours per day). The lettuce was harvested and evaluated at the time of optimal maturity during the last 2 weeks of July. For each trial year, measured characteristics were based on measurements on 21 to 36 plants per variety except for the plant height at flowering which was based on a total of 20 plant measurements per variety. Mean differences were significant at the 5% probability level based on LSD values.
Comparison tables for 'AAC Johral' with reference varieties 'Estival' and 'Prestige'
Stem length (at harvest maturity) (from base of first external leaf forming head to apical bud) (mm)
| 'AAC Johral' | 'Estival' | 'Prestige' | |
|---|---|---|---|
| mean 2022 (LSD=4.8) | 46.4 | 59.1 | 77.9 |
| std. deviation 2022 | 5.8 | 9.2 | 15.9 |
| mean 2023 (LSD=6.4) | 64.5 | 70.1 | 96.2 |
| std. deviation 2023 | 6.8 | 14.3 | 11.9 |
Plant height (at flowering) (cm)
| 'AAC Johral' | 'Estival' | 'Prestige' | |
|---|---|---|---|
| mean 2022 (LSD=2.8) | 95.2 | 105.0 | 108.1 |
| std. deviation 2022 | 5.9 | 3.0 | 3.6 |
| mean 2023 (LSD=2.5) | 84.1 | 90.9 | 94.9 |
| std. deviation 2023 | 4.7 | 3.0 | 3.0 |
Click on image for larger view
Lettuce: 'AAC Johral' (top left) with reference varieties 'Prestige' (top right) and 'Estival' (bottom)
Click on image for larger view
Lettuce: 'AAC Johral' (bottom right) with reference varieties 'Estival' (bottom left) and 'Prestige' (top)
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