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Appendix 2: Sample evaluations of the potential for new plant products to be regulated under Part V of the Seeds Regulations

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Appendix 2D : Powdery mildew resistance in CDC Mozart field pea

PNT Determination Work Sheet
A companion document to Regulatory Directive 2009-09:
Plants with Novel Traits Regulated under Part V of the Seeds Regulations

Species: Pisum sativum CDC Mozart
Trait: Powdery mildew (Erysiphe pisi) resistance obtained through conventional breeding

1. Was the trait bred into the plant from, or present in, germplasm (of the same species) cultivated* in Canada prior to 1996, or previously authorized by the PBO for use in a plant of the same species?

Yes – The powdery mildew resistance trait in pea has been utilized in Canadian agriculture for many years. The following powdery mildew resistant cultivars were cultivated in Canada prior to 1996 (year of registration in Canada, and the respective breeding organization): Tara (1974, Agriculture and Agri-Food Canada), AC Tamor (1990, Agriculture and Agri-Food Canada), and Highlight (1993, Svalof Weibull). Thus, powdery mildew resistance in pea is not a PNT. These three cultivars carry the gene er-1 for powdery mildew resistance. The resistance provided by this gene has been durable for more than 60 years (Harland 1948; Heringa et al. 1969; Tiwari et al. 1997). Since 1996 many powdery mildew resistant pea cultivars have been registered and cultivated.


Harland, 1948. Inheritance of immunity to mildew in Peruvian forms of Pisum sativum. Heredity 2:263-269.

Heringa R.J., Van Norel A., and Tazelaar M.F. (1969) Resistance to powdery mildew (Erysiphe polygoni D.C.) in peas (Pisum sativum L.). Euphytica 18:163-169.

Tiwari, K.R., Penner, G.A., and Warkentin, T.D. (1997) Inheritence of powdery mildew resistance in pea. Can. J. Plant Sci. 77:307- 310.

* The Plant Biosafety Office interprets "cultivated" to mean "grown by an individual as a crop." This means that seed multiplication plots and breeding lines are considered "cultivated."

If the answer to question 1 is "yes," then STOP. The plant is not a PNT and is not subject to regulation under Part V of the Seeds Regulations. Otherwise, continue:

2. Does the plant have a potential to have a significant negative environmental impact, relative to an appropriate Canadian comparator line (or lines), in terms of:  
2a. Weediness potential: Is there an increased potential that the plant will become a weed of agriculture or be invasive in the Canadian environment?


2b. Gene flow: Are there negative consequences to environmental safety resulting from the production of hybrids between the plant and any domestic or wild sexually compatible relatives that are present in Canada?


2c. Plant pest potential: Does the plant have increased potential to harbour and/or facilitate the spread of a pest or pathogen of the Canadian environment?


2d. Potential negative impacts on non-target organisms: Could the plant have negative impacts on non-target organisms interacting directly or indirectly with it, including humans as workers or bystanders?


2e. Other potential negative impacts on biodiversity: Does the plant have any other potential negative impacts on biodiversity, including changes to environmentally sustainable crop management practices*?


If the answer to any part of question 2 is "yes" or is unclear, then contact the Plant Biosafety Office: the plant may be a PNT and may be regulated under Part V of the Seeds Regulations.

* The Plant Biosafety Office interprets "environmentally sustainable crop management practices" to mean "crop management practices that promote long-term maintenance of ecosystem components and functions for future generations."

Please note: Depending on the product, data requirements for some criteria may be more extensive than others. Evidence, such as experimental data or peer-reviewed literature, should be available to support the rationale provided in this document.
The PBO reserves the right to request that more extensive data be supplied in support of a determination or to confirm the determination by the proponent.

Conclusion: This plant is not a PNT and is not regulated under Part V of the Seeds Regulations.

The trait of interest in this product was present in a distinct, stable population of the same species in Canada prior to 1996; the PBO does not have to be notified.

Next page: Appendix 2E | Previous page: Appendix 2C