Preventive Effects of Fluoro-Substituted Benzothiadiazole Derivatives and Chitosan Oligosaccharide against the Rice Seedling Blight Induced by Fusarium oxysporum

Abstract

Rice seedling blight, caused by Fusarium oxysporum, significantly affects global rice production levels. Fluoro-substituted benzothiadiazole derivatives (FBT) and chitosan oligosaccharide (COS) are elicitors that can enhance plant resistance to pathogen infection. However, there is a lack of information regarding FBT and COS used as elicitors in rice seedlings blight. Therefore, the aim of this study was to evaluate the effect of FBT and COS treatments on rice seedling blight and elucidate the molecular mechanisms of the two elicitors for inducing resistance using proteomic technique. Results indicated that FBT and COS significantly reduced the disease incidence and index, and relived the root growth inhibition caused by F. oxysporum (p < 0.05). Biochemical analyses demonstrated that these two elicitors effectively enhanced activities of defense enzymes. Moreover, the proteomic results of rice root tissues disclosed more differentially expressed proteins in diterpenoid biosynthesis pathway that were particularly stimulated by two elicitors compared to the other pathways studied, resulting in the accumulation of antimicrobial substance, momilactone. Findings of this study could provide sound theoretical basis for further applications of FBT and COS used as rice elicitors against seedling blight.

Chitosan Induces Plant Hormones and Defenses in Tomato Root Exudates

“…Importance of chitosan in plant hormone production and systemic acquired resistance has been widely demonstrated ( Mika et al, 2010 ; Colman et al, 2019 ; Fooladi vanda et al, 2019 ; Iglesias et al, 2019 ; Ma et al, 2019 ). We have found that increasing chitosan leads to the accumulation of fluorescence compounds corresponding to phenolics, as well as hormones related to plant growth and defense (JA, SA, ABA, and IAA).…”

Chitin- and Chitosan-Based Derivatives in Plant Protection against Biotic and Abiotic Stresses and in Recovery of Contaminated Soil and Water

“…Similarly, chitosan alleviates diseases induced by Fusarium spp. in potato (Solanum tuberosum L.) [15] and by Fusarium oxysporum in rice (Oryza sativa L.) [16]. Interestingly, in Sun Chu Sha mandarin (Citrus reticulata Blanco) plants, hexaacetyl-chitohexaose, a chitin-derived oligosaccharide, affects the vitality of Asian citrus psyllid (Diaphorina citri), the hemipteran vector of Candidatus Liberibacter asiaticus, the pathogen associated with citrus greening disease [17].…”

Synthesis of Novel 6-Aryloxy-4-chloro-2-phenylpyrimidines as Fungicides and Herbicide Safeners

“…S. sclerotiorum , T. cucumeris , F. graminearum , and F. oxysporum are pervasive plant pathogenic fungal species, which cause great damage to the production of crop plants. 59 − 62 Hence, we investigated the fungicidal activities of target compounds 1–27 toward these fungi in primary screen (50 mg/L) and pyrimethanil, a pyrimidine-type fungicide for controlling fungus such as S. sclerotiorum , 42 , 63 was used as a positive control, and the results are listed in Table 1 . It was found that the fungicidal activities of target compounds against S. sclerotiorum (89–97%) and T. cucumeris (50–89%) were better than those against F. graminearu (7–42%) and F. oxysporum (7–60%).…”