By comparison, the DS of a resistant variety, Gaopin 6 (G), was only 0.88 in the P+ treatment and 3.82 in the P− treatment. The results showed that at 144 h after inoculation (hai) with the ShB C30 strain, many disease spots occurred obviously in a susceptible variety, Lemont (L), treated by 1.0 μmol/L PQQ (P+) with the disease score (DS) of 4.36, and almost all plants were withered and died under the ddH 2O (P−) treatment alone, with the DS of 8.39. In this study, the phenotype and mechanism of foliar sprayed PQQ-induced rice resistance to ShB were investigated by artificial inoculation method, RNA-seq technology, and quantitative real-time PCR (qRT-PCR) assay in the laboratory. However, little information is available on the mechanism of PQQ-induced rice resistance to ShB. In a previous study, we found that foliar sprays of pyrroloquinoline quinone (PQQ) as the bioactive inducer could remarkably reduce the occurrence index of rice sheath blight (ShB) Rhizoctonia solani and increase the grain yield of rice under field conditions. Using bioactive inducers to enhance rice resistance is an effective means of green prevention and control of diseases during rice production.
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