Nitrogen fertilization effects on wheat blast epidemics under varying field environmental conditions

Silva, Sérgio Ricardo; Custódio, Adriano Augusto de Paiva; Foloni, José Salvador Simoneti; Betioli-Junior, Edner; Bassoi, M. C.

doi:10.1007/s40858-019-00290-3

Cited by 9 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, climate variability might override the depression effect of the low-external-input farming system on rice diseases. Other study found a positive association between the severity of wheat blast (caused by fungus M. oryzae ) and the amount of nitrogen fertilization in Brazil 40 .…”

Section: Discussionmentioning

confidence: 92%

Weather fluctuation can override the effects of integrated nutrient management on fungal disease incidence in the rice fields in Taiwan

Chiu

Chen

et al. 2022

Sci Rep

View full text Add to dashboard Cite

Both weather fluctuation and farming system influence the epidemiology of crop diseases. However, short-term experiments are difficult to mechanistically extrapolate into long-term ecological responses. Using a mechanistic model with Bayesian inference, long-term data spanning 10 years were used to construct relationships among weather fluctuation (temperature, relative humidity, wind, and rainfall), farming system (conventional and low-external-input farming), and crop disease in experimental rice fields in Taiwan. Conventional and low-external-input farming had similar influences on the disease incidence of rice blast. Temperature had a positive influence on the disease incidence only under high relative humidity. Rainfall positively affected the disease incidence until an optimum level of rainfall. Low-external-input farming, with a lower application of fertilizers and other sustainable nutrient management, achieved similar effects on the disease incidence to those achieved by conventional farming. This suggests that weather fluctuation may override the effect of the farming systems on fungal disease incidence in rice fields.

show abstract

Section: Discussionmentioning

confidence: 92%

Weather fluctuation can override the effects of integrated nutrient management on fungal disease incidence in the rice fields in Taiwan

Chiu

Chen

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Metabolicamente, a forma amoniacal aumenta o teor de açúcar apoplástico e aminoácidos, bem como GABA (ácido gama-aminobutírico), aumentando assim a disponibilidade de nutrientes para o patógeno invasor (GUPTA et al, 2017). Já o nitrato, aumenta a produção de poliaminas (espermina e espermidina), que são sinais de defesa estabelecidos (SILVA et al, 2019).…”

Section: Nitrogêniounclassified

Manejo da nutrição mineral e doenças de plantas – uma revisão

Barbosa,

Bentes,

Ferreira

2023

Rev Agr Acad

View full text Add to dashboard Cite

Plant diseases are responsible for significant reductions in agricultural production. The ability of the plant to express resistance to a given phytopathogen is strongly affected by mineral nutrition. The mechanisms leading to these mineral nutrient-induced changes in disease development are complex and include effects directly on the pathogen, the host and the environment. In the present review, studies on the effect of macro- and micronutrients on plant disease intensity are presented, showing the need for understanding this interaction for the correct establishment of integrated management measures.

show abstract

“…A balanced plant nutrition is required to avoid excess of certain amino acids in plant cells, which is used by the pathogen. The effect of nitrogen on wheat blast is not entirely clear, but studies suggested a positive association between nitrogen rate and wheat blast intensity (Huber and Thompson 2007;Silva et al 2019). The pathogen seems to be able to manipulate the plant system to obtain the required nutrients, thus causing physiological changes.…”

Section: Wheat Blast Managementmentioning

confidence: 99%

Taxonomic and pathogenic diversity of the blast pathogen populations infecting wheat and grasses in Minas Gerais

Ascari¹,

Ponte²

2021

Preprint

View full text Add to dashboard Cite

The blast disease of Poaceae is caused by a large species complex, among which P. oryzae is composed of several host-specialized lineages. The Pyricularia oryzae Triticum pathotype (PoT) causes the blast disease in wheat, but is also capable of infecting other grasses, which may serve as an inoculum reservoir for epidemics in wheat. In Brazil, severe wheat blast epidemics are most common in the Cerrado region. The dominant hypothesis is that signal grass (Urochloa sp.) and other gramineous plants harbor the wheat blast pathogen, thus serving as a major reservoir of inoculum for epidemics in wheat. A two-year survey of the Pyricularia blast pathogens was conducted in both wheat and non-wheat areas as well as prior (February) and during (May) the wheat growing season in Minas Gerais. A total of 1,368 plant samples representative of 31 Poaceae species, including wheat, were collected and inspected for the presence of blast symptoms. During the isolations, 932 isolates were obtained, being one fourth obtained from gramineous plants. A subset of 572 isolates was selected for identification at the species level based on portions of the CH7-BAC9 gene sequences. Most of the isolates (n = 494) were P. oryzae, within which 68% were PoT and 32% non-PoT based on two PCR assays targeting (MoT3 and C17 PCR assays). The PoT lineage was found predominantly (97%) in wheat and rarely in the other hosts, even nearby wheat fields (2.1%), as well as at longer distances from wheat regions (0.1%). The blast pathogen population isolated from signal grass grouped in different clades from PoT, and therefore referred to Urochloa lineage (PoU). A series of cross-inoculation greenhouse experiments was conducted using wheat (cv. BRS Guamirim and BR 18-Terena) and signal grass (cv. Marandu) as host and 14 PoT and six PoU isolates as pathogen factor. In the first leaf-inoculation experiment, results showed a significant interaction between host and pathogen; PoT was strongly/weakly aggressive towards wheat/signal grass and PoU was strongly/weakly aggressive towards signal grass/wheat. In inoculated wheat heads, PoT was more aggressive (>91% infected spikelets) than PoU (52% infected spikelets). In a third experiment, four signal grass cultivars (Marandu, Basilisk, Piatã, and Xaraés) were inoculated with the same set of 20 isolates. Similarly, signal grass cultivars were generally more susceptible to PoU than PoT. Severity induced by PoU was twice (7.7% severity) as high as PoT (3.8%) and so was the number of conidia/leaf produced by PoU (47,500) and PoT (23,200). Two groups of signal grass cultivars were formed, the most susceptible composed of Marandu and Basilisk and the least susceptible composed of Piatã and Xaraés. Results of our study confirm the host-specialization and the shaping of the blast populations according to the host. We further suggest that grasses in general, especially signal grass, may not play a major role as an inoculum reservoir for PoT, as it harbors mainly the PoU population. However, due to the large extent of pasture-growing regions and cross-infection ability in wheat, signal grass may harbor amounts of PoT inoculum that are sufficient for initiating leaf and head blast epidemics in wheat blast in Minas Gerais state.

show abstract

Nitrogen fertilization effects on wheat blast epidemics under varying field environmental conditions

Cited by 9 publications

References 25 publications

Weather fluctuation can override the effects of integrated nutrient management on fungal disease incidence in the rice fields in Taiwan

Weather fluctuation can override the effects of integrated nutrient management on fungal disease incidence in the rice fields in Taiwan

Manejo da nutrição mineral e doenças de plantas – uma revisão

Taxonomic and pathogenic diversity of the blast pathogen populations infecting wheat and grasses in Minas Gerais

Contact Info

Product

Resources

About