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Episode 645             Episode 647
Episode 646

Horizontal resistance
Sat, 2019-Feb-09 00:05 UTC
Length - 2:27

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Welcome to random Wiki of the Day where we read the summary of a random Wikipedia page every day.

The random article for Saturday, 9 February 2019 is Horizontal resistance.

In genetics, the term horizontal resistance was first used by J.E. Vanderplank to describe many-gene resistance, which is sometimes also called generalized resistance. This contrasts with the term vertical resistance which was used to describe single-gene resistance. Raoul A. Robinson further refined the definition of horizontal resistance. Unlike vertical resistance and parasitic ability, horizontal resistance and horizontal parasitic ability are entirely independent of each other in genetic terms.

In the first round of breeding for horizontal resistance, plants are exposed to pathogens and selected for partial resistance. Those with no resistance die, and plants unaffected by the pathogen have vertical resistance and are removed. The remaining plants have partial resistance and their seed is stored and bred back up to sufficient volume for further testing. The hope is that in these remaining plants are multiple types of partial-resistance genes, and by crossbreeding this pool back on itself, multiple partial resistance genes will come together and provide resistance to a larger variety of pathogens.

Successive rounds of breeding for horizontal resistance proceed in a more traditional fashion, selecting plants for disease resistance as measured by yield. These plants are exposed to native regional pathogens, and given minimal assistance in fighting them.

This recording reflects the Wikipedia text as of 00:05 UTC on Saturday, 9 February 2019.

For the full current version of the article, see Horizontal resistance on Wikipedia.

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