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Introduction to Open Plant Breeding: Vertical and Horizontal Resistance Explained

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This is a slideshow introduction of open plant breeding, explaining the difference between vertical and horizontal resistance.

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Vertical and Horizontal resistance compared

On March 17th, 2008 Samuel_E says:

I think you may have got the One agro-ecosystem and Many agro-ecosystems the wrong way round. You list one agro-ecosystem as being a feature of horizontal resistance. I thought it was a feature of Vertical resistance.

vertical and horizontal resistance compared

On March 18th, 2008 raoulrob says:

Vertical resistance functions over a wide climatic range until such time as it breaks down. HR, on the other hand, is sensitive to the epidemiological competence of the parasite, and this can vary widely between agro-ecosystems. Hence the need for on-site selection. Epidemiological competence can also vary in one locality between seasons, but most HR cultivars can cope with such variation.

Vertical and horizontal resistance compared

On March 18th, 2008 Samuel_E says:

Thank you for the clarification. It is very incourageing to learn that HR culitvars are not as geographly limited as I had thought. However the pedant in me still thinks it strange to talk of, many agro-ecosystems/few cultivars and one agro-ecosystem/many cultivars. As a tyro plant breeder i’m too easily confused.

Vertical and horizontal resistance compared

On March 19th, 2008 Samuel_E says:

I’ve worked out were I went wrong now. I had thought that as VR functions over a large area (asuming it funtions at all) that represented one agro-ecosystem. With HR as it functioned over a smaller area I thought that there were many agro-ecosystems. Now that the penney has dropped, I can see that an agro-ecosystem is determined by the factors influencing epidemialogical competance, not by the type of resistance in the host plant. Your comparisons now make perfect sense. My mistake.

VR & HR compared

On March 26th, 2008 raoulrob says:

Congratulations on the speed with which you are picking this up. It can be very confusing when first encountered.