Bio524_10_Lectures_7_and_8_Plant Immune

Bio524_10_Lectures_7_and_8_Plant Immune - Plant disease is...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Plant disease is real, and it matters Social relevance: Potato Blight / Irish potato famine 700,000 dead, 1 million emigrated, 1845-50 24K malnutrition deaths per day worldwide; ~ the same number as cancer! ~30% loss in productivity each year, usually AFTER energy, water and labor input $300 Billion in losses per year So, increasing plant productivity by combating pest and pathogen losses not only saves land from the plow, but it creates new water, and lots of it. Bacteria Fungi Nematodes Viruses Plant Pathogens: Variety of Lifestyles Resistance to all of these classes of parasites is mediated by a single evolutionarily conserved class of proteins called Disease Resistance Proteins. r R Flax and flax rust ( Melampsora lini ); HH Flor 1940s Jeff Ellis, Greg Lawrence, Tony Pryor, CSIRO Canberra, Aus. The microscopic and sub-microscopic parasites can evolve so much more rapidly than their hosts that the latter have little chance of evolving complete immunity to them. The most that the average species can achieve is to dodge its minute enemies by constantly producing new genotypes, as the agronomists are constantly producing new rust-resistant wheat varieties . JBS Haldane, 1949 Disease and Evolution Suppl. La Ricerca Scientifica 19 , 68 A simple truth The molecular logic of plant immune system Chisholm et al. (2006) Cell 124, 803-814. Bacteria Fungi Nematodes Viruses The Plant Immune System recognizes plant pathogens with various lifestyles Resistance to all of these diverse parasites is mediated by a single, evolutionarily conserved class of proteins called Disease Resistance Proteins. These mostly encode NB-LRR proteins. P. syringae species can infect many hosts phaseolicola tabaci pisi glycinea tomato tomato Host cell Bacteria Host cell Bacteria S.Y. He, Michigan State Univ....
View Full Document

Page1 / 42

Bio524_10_Lectures_7_and_8_Plant Immune - Plant disease is...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online