Viroses em trigo no brasil: uma visão histórica

Stempkowski, Lucas Antônio; Mar, Talita Bernardon; Pereira, Fernando Lourenço; Santos, Ana Karoliny Alves; Valente, Juliana Borba; Lau, Douglas; Casa, Ricardo Trezzi; Silva, Fábio Nascimento da

doi:10.31976/0104-038321v280005

Cited by 2 publications

(2 citation statements)

References 93 publications

(134 reference statements)

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“…Besides their low genetic variability, both the Brazilian and South African subpopulations are highly genetically stable as a function of strong purifying selection acting upon their genes. Wheat is an introduced crop in Brazil and South Africa, and besides wheat, WhSMV is only known to infect rye ( Secale cereale ), triticale (× Triticosecale ) and barley ( Hordeum vulgare ) (Stempkowski et al., 2020, 2022). It is therefore reasonable to assume that the virus has been co‐evolving with its (cultivated) hosts for a relatively short period of time.…”

Section: Discussionmentioning

confidence: 99%

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Wheat stripe mosaic virus from Brazil and South Africa evolved as distinct subpopulations with low genetic variability

Stempkowski,

Pereira,

Lau

et al. 2023

Plant Pathology

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Wheat stripe mosaic virus (WhSMV) is the causal agent of soilborne wheat mosaic disease (SBWMD) in Brazil, which is a serious threat to wheat production in the southern part of the country. WhSMV also occurs in Paraguay and South Africa. The virus is soilborne, transmitted by Polymyxa graminis, and management strategies are mainly based on genetic resistance. Variation in the reaction (type and severity of symptoms) of cultivars has been reported depending on the region and/or year of cultivation, leading wheat breeding programmes to test their materials in several locations, which increases costs and is time‐consuming. One hypothesis is that this variation in symptoms is a result of the genetic variability of WhSMV. We assessed the genetic variability and population structure of WhSMV infecting wheat in Brazil and South Africa. In field experiments conducted in different locations in southern Brazil, a consistent reproducibility of symptoms was observed in a set of cultivars, and molecular analysis showed a low degree of genetic variability of the Brazilian viral population. The hypothesis that the variation in SBWMD symptoms in Brazil is due to genetic variability of the virus was thus rejected. Comparison of the Brazilian and South African WhSMV isolates indicated that they comprise distinct subpopulations and that the Brazilian subpopulation is more variable than the South African subpopulation. The lower genetic variability of the South African subpopulation suggests genetic stability or a recent emergence of WhSMV in that region.

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Section: Discussionmentioning

confidence: 99%

“…The typical symptoms are yellow mosaic and streaking on leaves and stems. Plants are often stunted and may exhibit rosette formation as a consequence of short and excessive tillering (Stempkowski et al., 2022). The disease was reported for the first time in Rio Grande do Sul state in the 1960s (Caetano et al., 1978).…”

Section: Introductionmentioning

confidence: 99%