Effect of wheat cultivar mixtures on populations of <i>Puccinia striiformis</i> races*

DiLeone, J. A.; Mundt, Christopher C.

doi:10.1111/j.1365-3059.1994.tb01637.x

Cited by 39 publications

(32 citation statements)

References 16 publications

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“…Dinoor 1970;de Nooij & van Damme 1988;Parker 1988;Bevan et al 1993;Antonovics et al 1994;Thrall et al 2001;Laine 2004). In turn, this heterogeneity will have an impact on fundamental aspects of hostpathogen interactions such as the transmission of local epidemics and the evolution of virulence (Browning & Frey 1969;Wolfe 1985;DiLeone & Mundt 1994;Zhu et al 2000;Thrall et al 2001;Thrall & Burdon 2003). The results presented here highlight the importance of spatial and temporal data on disease occurrence when addressing questions of current coevolutionary selection.…”

Section: Evolution Of Host Resistance A-l Laine 269mentioning

confidence: 86%

Evolution of host resistance: looking for coevolutionary hotspots at small spatial scales

2005

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Natural plant populations are often found to be extremely diverse in their resistance to pathogens. While the potential of pathogens in driving the evolution of resistance in hosts has been widely recognized, empirical evidence linking disease dynamics to host population genetic structure has remained scarce. Here I show that current coevolutionary selection for resistance can be divergent even on a very fine spatial scale. In a natural plant-pathogen metapopulation, disease occurrence patterns were highly aggregated over space and time within host populations. A laboratory inoculation experiment showed higher resistance within areas of the host populations where encounter rates with the pathogen have been high. Higher resistance to sympatric than to allopatric strains of the pathogen suggests that this change has taken place as a response to local selection. These results constitute evidence of adaptive microevolution of resistance resulting from disease epidemics in natural plant-pathogen associations, and highlight the importance of finding the relevant scale at which to address questions of current coevolutionary selection.

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Section: Evolution Of Host Resistance A-l Laine 269mentioning

confidence: 86%

Evolution of host resistance: looking for coevolutionary hotspots at small spatial scales

2005

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“…In experiments of wide climbs space, these same fungi increased in complexity in areas in Germany, where mixtures of barley are cultivated in an area around the 360.000ha. In agreement with DILEONE & MUNDT (1994), it is more difficult to determine the selective influence of the mixtures for clonal pathogens because virulence genes are not randomly associated with other genes that can influence the fitness of the pathogens. Along several experimental researches being used artificial inoculation of Puccinia graminis, KOLMER (1995), it tried to dissociate virulence of the genetic "background" of the pathogen.…”

Section: Implications and Consequences Of The Use Of Mixturesmentioning

confidence: 91%

“…No surprisingly, VALÉRIO et al (2004) told that the total diversity values showed for all mixtures among different sorghum lineages, with different anthracnose resistance levels, did not supported pathogen populations phenotypically more diverse than that observed in their respective pure stands. Therefore, with rare exceptions (BROWNING & FREY, 1981;MULLER et al, 1996), the diversity degree maintained in a mixture seems to be positively related to the degree of control of disease supplied by a certain mixture (DILEONE & MUNDT, 1994). In a wider aspect, is that mixtures would select for the complex races frequency increase, that is, those with corresponding virulences to the more than a resistance gene in a mixture.…”

Section: Implications and Consequences Of The Use Of Mixturesmentioning

confidence: 99%

Diversification of Host Plants as a Strategy in the Control of Plant Diseases

Valério¹,

Casela²

2017

ijSciences

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ABSTRACT:With the purpose of to avoid or to reduce some of those inherent problems to the agricultural systems based on monoculture, it should be introduced and handled the diversity in the best possible way. In a high level, the monoculture of species is difficult of being modified, at least in short space of time. At the level of the varieties of plants, the diversification is relatively easy of being handled, mainly in the mixture form of cultivars, varieties or hybrid (simple, double or triples) in the farmings. These mixtures can be produced in commercial scale, with excellent results in relation to most of the experimental scales, or for small producers at a low cost, seeking a good level of control of diseases and stability in the productivity. The composition of the mixtures can be modified transiently to delay or to reduce the selection of new races capable to overcome the resistances of more than one of the components of a mixture. The main disadvantage is that the quality of the mixtures cannot be acceptable for the final consumer of the product of these diversified farmings. However, mixtures of varieties, hybrid or of lineages, can significantly improve the control of some of the most common diseases disseminated by the air and for the water. For this reason, cultural practices more diversified are, consequently, recommended to complement the resistance of the hosts, in matter, in the Sorghum bicolor-Colletotrichum sublineolum pathosystem and to reduce the selection pressure in fields.

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“…Greater disease reductions due to host diversity were found for stripe rust than for eyespot of wheat (21). The relative abundance of Puccinia striiformis races changed during the season within mixtures, but races virulent to more than one mixture component did not always come to dominate the pathogen population (8). Host-diversity effects differed for different wheat cultivars and for particular wheat cultivars depending on which other cultivars were mixed with them (18).…”

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confidence: 96%

Effects of Planting Density and the Composition of Wheat Cultivar Mixtures on Stripe Rust: An Analysis Taking into Account Limits to the Replication of Controls

Garrett¹,

Mundt²

2000

Phytopathology®

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Garrett, K. A., and Mundt, C. C. 2000. Effects of planting density and the composition of wheat cultivar mixtures on stripe rust: An analysis taking into account limits to the replication of controls. Phytopathology 90: 1313-1321.The effect of plant density on disease is not well understood in populations of a single host plant genotype and has been studied even less in mixtures of host genotypes. We performed an experiment to evaluate the effect of wheat planting density on infection by Puccinia striiformis in experimental plots with a single wheat genotype and in plots with two genotypes making up a range of frequencies. Stripe rust severity in single-genotype plots increased with planting density in 1997 but decreased with planting density in 1998. Disease in host mixtures was compared to the weighted mean of disease levels in the corresponding single-genotype plots. The design of the field experiment included limited replication of these reference treatments (that is, there was not a unique pair of single-genotype plots for each mixture plot); therefore, we devised an analysis based on collapsing the data into independent mean observations. Disease reduction due to host diversity was less when one genotype predominated than when both host genotypes were present at nearly equal frequencies. The greatest mean host-diversity effect for reduced disease was at the intermediate planting density of 250 seeds per m 2 .

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Effect of wheat cultivar mixtures on populations of Puccinia striiformis races*

Cited by 39 publications

References 16 publications

Evolution of host resistance: looking for coevolutionary hotspots at small spatial scales

Evolution of host resistance: looking for coevolutionary hotspots at small spatial scales

Diversification of Host Plants as a Strategy in the Control of Plant Diseases

Effects of Planting Density and the Composition of Wheat Cultivar Mixtures on Stripe Rust: An Analysis Taking into Account Limits to the Replication of Controls

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