Gene-for-gene interaction - PRG Wiki
The impact of variation in mating system on genetic diversity is a and evaluated the relationship between mating system, genetic diversity and Cornuet JM, Pudlo P, Veyssier J, Dehne-Garcia A, Gautier M, Leblois R, et al. The genetic relationships between the clusters were evaluated based on .. Cornuet JM, Pudlo P, Veyssier J, Dehne-Garcia A, Gautier M. tolerance in barley: genetic relationships among genotypes of diverse origin. Euphytica – Oerke EC, Dehne HW () Global crop production.
Resistance genes[ edit ] Classes of resistance gene[ edit ] There are several different classes of R Genes. The protein products of the PRRs contain extracellular, juxtamembrane, transmembrane and intracellular non-RD kinase domains. This includes the N resistance gene of tobacco against tobacco mosaic virus TMV. The other subclass does not contain a TIR and instead has a leucine zipper region at its amino terminal. The protein products encoded by this class of resistance gene are located within the plant cell cytoplasm.
Gene-for-gene relationship - Wikipedia
There are other classes of R genes, such as the extracellular LRR class of R genes; examples include rice Xa21D  for resistance against Xanthomonas and the cf genes of tomato that confer resistance against Cladosporium fulvum.
The Pseudomonas tomato resistance gene Pto belongs to a class of its own. Specificity of resistance genes[ edit ] R gene specificity recognising certain Avr gene products is believed to be conferred by the leucine rich repeats. LRRs are multiple, serial repeats of a motif of roughly 24 amino acids in length, with leucines or other hydrophobic residues at regular intervals.
Some may also contain regularly spaced prolines and arginines.
LRR swapping experiments between resistance genes in flax rust resulted in the specificity of the resistance gene for the avirulence gene changing.
The diploid sexual race of Cyrtomium falcatum Japanese holly fern shows mating system variation, i. We examined whether there is variation in the selfing rate among populations of this species, and evaluated the relationship between mating system, genetic diversity and effective population size using microsatellites.
‘Happy gene’ may increase chances of romantic relationships
In this study, we developed eight new microsatellite markers and evaluated genetic diversity and structure of seven populations four M-type and three S-type. Although evidence of past bottleneck events was detected in all populations by ABC, the current Ne of the M-type populations was about a third of that of the S-type populations. These results suggest that the M-type populations have experienced more frequent bottlenecks, which could be related to their higher colonization ability via gametophytic selfing.
Instead, significant isolation by distance was detected among all populations. These results suggest that mating system variation in this species is generated by the selection for single spore colonization during local extinction and recolonization events and there is no genetic structure due to mating system.
Introduction The diversity of mating and sexual systems in land plants is of great interest to evolutionary biologists.
For seed plants, the presence of both male and female reproductive organs within a single individual i. Thus, seed plants are potentially faced with a strategic decision of whether to reproduce through outcrossing, selfing, or mixed mating, which is a mixture of outcrossing and selfing [ 2 ].
In the short term, selfing is favored due to transmission advantage [ 3 ] and reproductive assurance [ 45 ]. However the progeny derived from selfing may suffer inbreeding depression [ 6 ].
The relative balance between these advantages and disadvantages strongly influences mating system evolution. In this respect, the correlation between the evolution of selfing and severe genetic drift events such as bottlenecks is important because both the transmission advantage [ 3 ] and reproductive assurance [ 45 ] theories predict their co-occurrence. The former theory predicts that population bottleneck events that result in the purging of inbreeding depression would trigger the evolution of selfing [ 7 ], while in the latter theory, selfing would be favored under limited mating opportunities, which are expected in colonization processes.
Thus, if populations display mating system variation, reduction of effective population size is expected, due to the co-occurrence of selfing and bottlenecks [ 8 ]. However, this scenario has not been well examined in either gymnosperm or pteridophyte species.