The wheat–Septoria conflict: a new front opening up?

O’Driscoll, Aoife; Kildea, Steven; Doohan, Fiona M.; Spink, John; Mullins, Ewen

doi:10.1016/j.tplants.2014.04.011

Cited by 109 publications

(95 citation statements)

References 79 publications

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“…Zymoseptoria tritici (syn Mycosphaerella graminicola) is the fungal pathogen causing Septoria tritici blotch, currently the most damaging wheat disease in Europe (Jorgensen et al, 2014;O'Driscoll et al, 2014). The 39.7 Mb reference genome is among the best-assembled fungal genomes available.…”

Section: Introductionmentioning

confidence: 99%

“…Z. tritici is a dimorphic fungus than can grow either as filamentous hyphae or yeast-like budding cells when grown in vitro (Nadal et al, 2008). The pathogen is found in wheat-growing areas worldwide covering a wide range of temperature regimens (Eyal et al, 1987;Zhan and McDonald, 2011;Jorgensen et al, 2014;O'Driscoll et al, 2014). An earlier study that included 138 Z. tritici strains sampled from diverse thermal environments on three continents found evidence for thermal adaptation and concluded that most of the thermal adaptation was due to genetic differentiation rather than phenotypic plasticity (Zhan and McDonald, 2011).…”

Section: Introductionmentioning

confidence: 99%

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QTL mapping of temperature sensitivity reveals candidate genes for thermal adaptation and growth morphology in the plant pathogenic fungus Zymoseptoria tritici

et al. 2016

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Different thermal environments impose strong, differential selection on populations, leading to local adaptation, but the genetic basis of thermal adaptation is poorly understood. We used quantitative trait locus (QTL) mapping in the fungal wheat pathogen Zymoseptoria tritici to study the genetic architecture of thermal adaptation and identify candidate genes. Four wild-type strains originating from the same thermal environment were crossed to generate two mapping populations with 263 (cross 1) and 261 (cross 2) progeny. Restriction site-associated DNA sequencing was used to genotype 9745 (cross 1) and 7333 (cross 2) singlenucleotide polymorphism markers segregating within the mapping population. Temperature sensitivity was assessed using digital image analysis of colonies growing at two different temperatures. We identified four QTLs for temperature sensitivity, with unique QTLs found in each cross. One QTL had a logarithm of odds score 411 and contained only six candidate genes, including PBS2, encoding a mitogen-activated protein kinase kinase associated with low temperature tolerance in Saccharomyces cerevisiae. This and other QTLs showed evidence for pleiotropy among growth rate, melanization and growth morphology, suggesting that many traits can be correlated with thermal adaptation in fungi. Higher temperatures were highly correlated with a shift to filamentous growth among the progeny in both crosses. We show that thermal adaptation has a complex genetic architecture, with natural populations of Z. tritici harboring significant genetic variation for this trait. We conclude that Z. tritici populations have the potential to adapt rapidly to climate change and expand into new climatic zones.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

QTL mapping of temperature sensitivity reveals candidate genes for thermal adaptation and growth morphology in the plant pathogenic fungus Zymoseptoria tritici

et al. 2016

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“…The mild temperatures and high rainfall incidence that characterise the climate of Ireland are also very conducive to the incidence and rapid spread of Septoria tritici blotch (STB), caused by Zymoseptoria tritici, which is the foliar disease that has the most destructive effect on winter wheat yield in Northwestern Europe (Jess et al, 2014;O'Driscoll et al, 2014). As such, winter wheat crops in Ireland are typically heavily reliant on extensive fungicide programmes and other cultural disease prevention strategies, such as delayed sowing and the use of resistant varieties (O'Driscoll et al, 2014), which may reduce achievable yield.…”

Section: Discussionmentioning

confidence: 99%

Assessment of water-limited winter wheat yield potential at spatially contrasting sites in Ireland using a simple growth and development model

Lynch¹,

Fealy

Doyle³

et al. 2017

Irish Journal of Agricultural and Food Research

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Although Irish winter wheat yields are among the highest globally, increases in the profitability of this crop are required to maintain its economic viability. However, in order to determine if efforts to further increase Irish wheat yields are likely to be successful, an accurate estimation of the yield potential is required for different regions within Ireland. A winter wheat yield potential model (WWYPM) was developed, which estimates the maximum water-limited yield achievable, within the confines of current genetic resources and technologies, using parameters for winter wheat growth and development observed recently in Ireland and a minor amount of daily meteorological input (maximum and minimum daily temperature, total daily rainfall and total daily incident radiation). The WWYPM is composed of three processes: (i) an estimation of potential green area index, (ii) an estimation of light interception and biomass accumulation and (iii) an estimation of biomass partitioning to grain yield. Model validation indicated that WWYPM estimations of water-limited yield potential (YP w ) were significantly related to maximum yields recorded in variety evaluation trials as well as regional average and maximum farm yields, reflecting the model's sensitivity to alterations in the climatic environment with spatial and seasonal variations. Simulations of YP w for long-term average weather data at 12 sites located at spatially contrasting regions of Ireland indicated that the typical YP w varied between 15.6 and 17.9 t/ha, with a mean of 16.7 t/ha at 15% moisture content. These results indicate that the majority of sites in Ireland have the potential to grow high-yielding crops of winter wheat when the effects of very high rainfall and other stresses such as disease incidence and nutrient deficits are not considered.

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“…The two allene oxides, 8R(9)-and 8S(9)-epoxy-9-octadecamonoenoic acids (EOMEs), are mainly hydrolyzed to -ketols by inversion of configuration at C-8 (solid arrows). wheat (22,23). Plants transform 13S-HPOTrE sequentially to allene oxides and to jasmonates, which act as growth and defense hormones (37,38).…”

Section: Discussionmentioning

confidence: 99%

“…Zymoseptoria tritici (teleomorph Mycosphaerella graminicola) causes the most important disease of wheat, septoria tritici blotch (22,23). Little is known about the DOX-CYP enzymes of these important pathogens.…”

mentioning

confidence: 99%

A new class of fatty acid allene oxide formed by the DOX-P450 fusion proteins of human and plant pathogenic fungi, C. immitis and Z. tritici

Oliw

Aragó

Chen

et al. 2016

Journal of Lipid Research

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The wheat–Septoria conflict: a new front opening up?

Cited by 109 publications

References 79 publications

QTL mapping of temperature sensitivity reveals candidate genes for thermal adaptation and growth morphology in the plant pathogenic fungus Zymoseptoria tritici

QTL mapping of temperature sensitivity reveals candidate genes for thermal adaptation and growth morphology in the plant pathogenic fungus Zymoseptoria tritici

Assessment of water-limited winter wheat yield potential at spatially contrasting sites in Ireland using a simple growth and development model

A new class of fatty acid allene oxide formed by the DOX-P450 fusion proteins of human and plant pathogenic fungi, C. immitis and Z. tritici

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