Effect of Temperature on Monogenic Lines of Wheat Leaf Rust Caused by  Puccinia triticina

El-Orabey, Walid; Shaheen, Dalia; Mabrouk, Ola; Elkot, Ahmed F.; Esmail, Samar M.

doi:10.21608/agro.2020.30089.1226

Cited by 3 publications

(4 citation statements)

References 16 publications

(23 reference statements)

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“…Unfortunately, we could not include this gene in our evaluation due to the lack in seeds of its line. However, previous study reported the susceptibility of this gene against the Egyptian races of LR ( El-Orabey et al, 2020 ). Therefore, we can confirm that chromosomes 6D carries unknown resistant genes which provides broad-spectrum resistance to almost all Pt Egyptian races.…”

Section: Discussionmentioning

confidence: 91%

Genome-Wide Screening of Broad-Spectrum Resistance to Leaf Rust (Puccinia triticina Eriks) in Spring Wheat (Triticum aestivum L.)

Mourad

Draz²,

Omar³

et al. 2022

Front. Plant Sci.

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Wheat leaf rust (LR) causes significant yield losses worldwide. In Egypt, resistant cultivars began to lose their efficiency in leaf rust resistance. Therefore, a diverse spring wheat panel was evaluated at the seedling stage to identify new sources of broad-spectrum seedling resistance against the Egyptian Puccinia triticina (Pt) races. In three different experiments, seedling evaluation was done using Pt spores collected from different fields and growing seasons. Highly significant differences were found among experiments confirming the presence of different races population in each experiment. Highly significant differences were found among the tested genotypes confirming the ability to select superior genotypes. Genome-wide association study (GWAS) was conducted for each experiment and a set of 87 markers located within 48 gene models were identified. The identified gene models were associated with disease resistance in wheat. Five gene models were identified to resist all Pt races in at least two experiments and could be identified as stable genes under Egyptian conditions. Ten genotypes from five different countries were stable against all the tested Pt races but showed different degrees of resistance.

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Section: Discussionmentioning

confidence: 91%

Genome-Wide Screening of Broad-Spectrum Resistance to Leaf Rust (Puccinia triticina Eriks) in Spring Wheat (Triticum aestivum L.)

Mourad

Draz²,

Omar³

et al. 2022

Front. Plant Sci.

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“…First, it was shown by El‐Orabey et al. (2020) that expression frequencies for several Lr genes often depend on temperature. Secondly, and more importantly, a population of P. triticina from a susceptible variety in a given location is expected to be very similar to the corresponding natural population in that location.…”

Section: Discussionmentioning

confidence: 99%

“…The expression of leaf rust resistance genes is known to be temperature dependent (Dyck & Johnson, 1983). For example, in Egypt, lines with genes Lr11 , Lr12 , Lr13 , Lr14a , Lr18 , Lr47 , Lr50 and Lr68 were susceptible at 25–30°C and resistant at 15 and 20°C, while other Lr genes were equally stable at all temperatures (El‐Orabey et al., 2020). Adult‐plant resistance (APR) genes are most often temperature sensitive (Kaul & Shaner, 1989).…”

Section: Introductionmentioning

confidence: 99%

Influence of biotic and abiotic factors on the virulence of Puccinia triticina population in southern Russia

Kudinova,

Agapova,

Vaganova

et al. 2023

Plant Pathology

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Wheat leaf rust, caused by Puccinia triticina, is reported annually in southern Russia, the main wheat production region in Russia. The effect of biotic (types of cultivar resistance) and abiotic (northern, central and southern agro‐ecological zones) factors on virulence variability of the pathogen was analysed with 43 Lr differentials. Virulence frequencies to Lr genes 1, 2c, 3, 3bg, 11, 14a, 14b, 16, 17, 18, 23, 25, 26, 33, 34, 40 and Kanr exceeded 50% in all populations. A total of 81 virulence phenotypes (based on the standard set of 20 differentials) were identified among 108 isolates. The most common phenotypes were PHSTQ, THTTR, PHTTR and TKTTR. The minimum genetic distance (the highest similarity) was established between the P. triticina populations from susceptible cv. Krasnodarskaya 99 and cv. Brigada with race‐specific resistance. P. triticina populations from the susceptible cultivar in the three agro‐ecological zones were less variable and more similar than the cultivar‐specific and natural pathogen populations. Resistance types of host cultivars seem to have a greater effect on the pathogen population than abiotic factors. Nevertheless, abiotic factors need to be considered when making decisions about deployment of wheat varieties. Our results support the paradigm of a shift in the population of an obligate parasite towards increased virulence in response to the selection pressure of cultivars with race‐specific resistance.

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“…In the case of wheat, it is known that some resistance genes against the most important rusts (leaf rust, yellow rust and stem rust) are influenced by temperature, being effective only at warm environmental conditions 41 – 43 . As a consequence, the deployment of this kind of genes requires experiments with specific conditions of increasing temperature in wheat-rust interactions for their identification 44 – 46 , which would become complex in future breeding studies if weather conditions become warmer.…”

Section: Introductionmentioning

confidence: 99%

Characterization of durum wheat resistance against leaf rust under climate change conditions of increasing temperature and [CO2]

Porras,

Miguel-Rojas,

Lorite

et al. 2023

Sci Rep

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Durum wheat cultivation in Mediterranean regions is threatened by abiotic factors, mainly related to the effects of climate change, and biotic factors such as the leaf rust disease. This situation requires an in-depth knowledge of how predicted elevated temperatures and [CO2] will affect durum wheat-leaf rust interactions. Therefore, we have characterised the response of one susceptible and two resistant durum wheat accessions against leaf rust under different environments in greenhouse assays, simulating the predicted conditions of elevated temperature and [CO2] in the far future period of 2070–2099 for the wheat growing region of Cordoba, Spain. Interestingly, high temperature alone or in combination with high [CO2] did not alter the external appearance of the rust lesions. However, through macro and microscopic evaluation, we found some host physiological and molecular responses to infection that would quantitatively reduce not only pustule formation and subsequent infection cycles of this pathogen, but also the host photosynthetic area under these predicted weather conditions, mainly expressed in the susceptible accession. Moreover, our results suggest that durum wheat responses to infection are mainly driven by temperature, being considered the most hampering abiotic stress. In contrast, leaf rust infection was greatly reduced when these weather conditions were also conducted during the inoculation process, resembling the effects of possible heat waves not only in disease development, but also in fungal germination and penetration success. Considering this lack of knowledge in plant-pathogen interactions combined with abiotic stresses, the present study is, to the best of our knowledge, the first to include the effects of the expected diurnal variation of maximum temperature and continuous elevated [CO2] in the durum wheat-leaf rust pathosystem.

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Effect of Temperature on Monogenic Lines of Wheat Leaf Rust Caused by Puccinia triticina

Cited by 3 publications

References 16 publications

Genome-Wide Screening of Broad-Spectrum Resistance to Leaf Rust (Puccinia triticina Eriks) in Spring Wheat (Triticum aestivum L.)

Genome-Wide Screening of Broad-Spectrum Resistance to Leaf Rust (Puccinia triticina Eriks) in Spring Wheat (Triticum aestivum L.)

Influence of biotic and abiotic factors on the virulence of Puccinia triticina population in southern Russia

Characterization of durum wheat resistance against leaf rust under climate change conditions of increasing temperature and [CO2]

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