Silicon Alleviates Changes in the Source-Sink Relationship of Wheat Plants Infected by Pyricularia oryzae

Phytopathology
Marcela Uli Peixoto AraújoFabrício Ávila Rodrigues

Abstract

Blast, caused by Pyricularia oryzae, has become a devastating disease on wheat in several countries worldwide. Growers need alternative methods for blast management, and silicon (Si) stands out for its potential to decrease the intensity of important diseases in several crops. This study investigated the effect of Si on improving photoassimilate production on flag leaves of wheat plants and their partitioning to spikes in a scenario where blast symptoms decreased as a result of potentiation of defense mechanisms by Si. Wheat plants (cultivar BRS Guamirim) were grown in hydroponic culture with 0 or 2 mM Si and inoculated with P. oryzae at 10 days after anthesis. The Si concentration on flag leaves and spikes of Si-supplied plants increased and resulted in lower blast symptoms. High concentrations of total soluble phenols and lignin-thioglycolic acid derivatives and greater peroxidase, polyphenoloxidase, phenylalanine ammonia-lyase, β-1,3-glucanase, and chitinase activity occurred on flag leaves and spikes of Si-supplied plants and increased their resistance to blast. The concentration of photosynthetic pigments decreased and the photosynthetic performance of infected flag leaves and spikes from plants not supplied with Si was im...Continue Reading

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Citations

Apr 11, 2020·Scientific Reports·Fernando Shintate GalindoMarcelo Carvalho Minhoto Teixeira Filho
Jul 3, 2021·Plants·Fernando Shintate GalindoMarcelo Carvalho Minhoto Teixeira Filho

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