The Gene-for-Gene Relationship in Plant-Parasite Interactions

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Most virulence frequencies did not show major changes, but the frequencies on the winter cv. Laverda and the spring cv. Kangoo greatly increased.

Host–Parasite Interactions and the Evolution of Gene Expression

The highest virulence frequency in all four years was on the resistance Ru2 in Kompolti 4. The period of sampling the air population and associated changes in the proportion of spores that developed on spring and winter varieties with different resistances are one of causes of the changes in virulence frequencies.

This could indicate the higher fitness of pathotypes with fewer virulences. Benada J. Contribution to epidemiology of powdery mildew.

Czech Academy of Agricultural Sciences

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Curr Opin Biotechnol. The possible genetic interactions between palnts and pathogens are represented in the following figure.

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Pathogen TOX gene codify for a toxic product required by the pathogen to induce virulence, while tox gene is the corrispective recessive allele. Rx gene allows the effective response of the plant to the pathogen attack, while rr is the recessive allele.

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An incompatibility I interaction is established when the plant can respond to pathogen attack or when pathogen can not produce effective toxin o virulence product. Conversely a compatible C interaction is allowed when pathogen produce the virulence factor and the plant can not develop a resistence response. Similarly, if two resistance genes R1 and R2 the dominant effective resistance allele, r1 and r2 represent the recessive alleles are recognized in the host plant genome and two corresponding avirulence genes are present in pathogen genome, compatibility C is achieved when the host is unable to produce a resistance response or the pathogen to encode a functional avirulence factor, and convesely for incompatibility I.

Compatibility between a pathogen and a host occurs when plant resistance genes or pathogen avirulence genes are lost or modified.

Jump to: navigation , search. PMID: This interaction leads to a compatibility or an incompatibility relation.

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PMID: Plants have evolved defense mechanisms capable of both recognizing and responding to several bacterial, fungal, oomycete, and viral pathogens, other than resistance against nematodes and insects. PMID: Plant resistance R proteins recognise pathogen avirulence Avr determinants and in turn trigger signal transduction cascades that lead to rapid defence activation. Category : Biology. Namespaces Page Discussion.


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GENE for GENE hypothesis

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After adhesion of rust urediospores to the plant surface, the development of infection structures results from a sophisticated host-surface recognition system. However, a plant that is Ww has two different alleles, one dominant and one recessive, and it is described as heterozygous. Trends Plant Sci. Joosten 1 G. Real-time quantitative RT-PCR experiments were conducted to quantify gene expression levels during coffee rust infection. As it happens, each of these solutions positively requires crop uniformity.