A novel water-based chitosan-La pesticide nanocarrier enhancing defense responses in rice (Oryza sativa L) growth

Liang, Wenlong; Yu, Aixin; Wang, Guodong; Zheng, Feng; Hu, Pengtong; Jia, Jingchun

doi:10.1016/j.carbpol.2018.07.042

Cited by 60 publications

(32 citation statements)

References 45 publications

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“…Furthermore, they evaluated the relative expression of the genes from treated seedlings, while we analyzed the transcript on the spikes, which were not subjected directly to the treatments, since the application of the compounds was performed on the flag leaves to observe the putative indirect antifungal ability of chitosan as SAR inductor. Regarding the antimicrobial mechanism of chitosan, several researchers have presented their hypotheses on the direct and/or indirect effects against pathogens: The positive charge of the protonated chitosan enables electrostatic interaction with the negative charge of the pathogens surface; chitosan increases the permeability of the membrane by damaging the cells of the pathogens resulting in cell death [ 58 ]; chitosan is also able to chelate the essential elements for the growth of the pathogens, such as metal ions, minerals, and nutrients, preventing the normal growth of the pathogens; chitosan may also interact with DNA or RNA leading to the inhibition of the mRNA synthesis; the deposition of chitosan on plant and pathogen surface forms a biofilm that limits the nutrient availability for microorganisms [ 59 , 60 , 61 ]; the ability of chitosan to induce the SAR in plants is associated with its elicitor-like properties, which boost the early activation of pathogenesis-related proteins and improve the plant resistance. As a result, chitinase and β-1,3-glucanase (PR2) enzymes degrade the fungal cell wall and stop its growth on the host plant [ 39 , 50 , 61 ].…”

Section: Discussionmentioning

confidence: 99%

Chitosan Hydrochloride Decreases Fusarium graminearum Growth and Virulence and Boosts Growth, Development and Systemic Acquired Resistance in Two Durum Wheat Genotypes

et al. 2020

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Fusarium head blight (FHB) is a devastating disease for cereals. FHB is managed by fungicides at anthesis, but their efficacy is variable. Conventional fungicides accumulate in the soil and are dangerous for animal and human health. This study assayed the antifungal ability of chitosan hydrochloride against Fusarium graminearum. Chitosan reduced F. graminearum growth and downregulated the transcript of the major genes involved in the cell growth, respiration, virulence, and trichothecenes biosynthesis. Chitosan promoted the germination rate, the root and coleoptile development, and the nitrogen balance index in two durum wheat genotypes, Marco Aurelio (FHB-susceptible) and DBC480 (FHB-resistant). Chitosan reduced FHB severity when applied on spikes or on the flag leaves. FHB severity in DBC480 was of 6% at 21 dpi after chitosan treatments compared to F. graminearum inoculated control (20%). The elicitor-like property of chitosan was confirmed by the up-regulation of TaPAL, TaPR1 and TaPR2 (around 3-fold). Chitosan decreased the fungal spread and mycotoxins accumulation. This study demonstrated that the non-toxic chitosan is a powerful molecule with the potential to replace the conventional fungicides. The combination of a moderately resistant genotype (DBC480) with a sustainable compound (chitosan) will open new frontiers for the reduction of conventional compounds in agriculture.

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Section: Discussionmentioning

confidence: 99%

Chitosan Hydrochloride Decreases Fusarium graminearum Growth and Virulence and Boosts Growth, Development and Systemic Acquired Resistance in Two Durum Wheat Genotypes

et al. 2020

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“…Previous studies have shown that chitosan has antifungal activity on various fungal pathogens [17,[30][31][32]. The antifungal activity of CCF mainly originated from the synergy of chitosan and ferulic acid (for detailed results, see Supplementary Table S3,S6-S8).…”

Section: Discussionmentioning

confidence: 99%

A Chitosan Composite Film Sprayed before Pathogen Infection Effectively Controls Postharvest Soft Rot in Kiwifruit

Zhang

Long

et al. 2020

Agronomy

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Soft rot caused by Botryosphaeria dothidea and Phomopsis sp. is a critical disease in kiwifruit. In order to efficiently control soft rot, a 28.6% chitosan composite film (CCF) containing chitosan, dextrin, ferulic acid, calcium, and auxiliaries was successfully developed. The results showed that CCF had a strong inhibitory effect on mycelia growth of B. dothidea and Phomopsis sp., with mycelial EC50 values of 68.11 and 50.34 mg L−1, respectively. The concentration of 0.71–1.42 g L−1 CCF had noticeably preventive and curative effects against soft rot. The spray of CCF before pathogen infection effectively reduced the incidence of soft rot, remarkably increased the content of resistance compounds, and activated the activity of defense enzymes. Moreover, it notably enhanced the yield and quality and prolonged the shelf life of kiwifruit. Therefore, the excellent control effects of CCF against soft rot might be associated with its film-forming property and antifungal activity, which prevent infection and induce plant defense mechanisms. The concentration of 0.71–1.42 g L−1 CCF was optimal for the field application before the onset of disease symptoms in plants with B. dothidea and Phomopsis sp.

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“…The antimicrobial action of chitosan on pathogens (bacteria, fungi and virus) relies on several mechanisms: (1) the positive charge of the protonated chitosan enables electrostatic interactions with the negative charge of the pathogen surface; (2) the cell damage and leakage of the pathogen, hence increases its membrane permeability and subsequently results in cell death [65]; (3) chitosan then chelates the essential elements (including metal ions, minerals and nutrients) for the growth of pathogens, thus, preventing the normal growth of pathogens; (4) DNA/RNA interaction of pathogens with the penetrated chitosan leads to the inhibition of the mRNA syncretization and pathogen reproduction; and lastly, (5) the deposition of chitosan on the microbial surface of pathogens forms a barrier to extracellular transport of the essential nutrients and metabolites from entering the cell, hence, inhibits the normal growth of pathogens [70][71][72].…”

Section: The Mechanism Of Actions Of Chitosan Against the Pathogensmentioning

confidence: 99%

Chitosan-Based Agronanochemicals as a Sustainable Alternative in Crop Protection

Maluin

2020

Molecules

127

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The rise in the World’s food demand in line with the increase of the global population has resulted in calls for more research on the production of sustainable food and sustainable agriculture. A natural biopolymer, chitosan, coupled with nanotechnology could offer a sustainable alternative to the use of conventional agrochemicals towards a safer agriculture industry. Here, we review the potential of chitosan-based agronanochemicals as a sustainable alternative in crop protection against pests, diseases as well as plant growth promoters. Such effort offers better alternatives: (1) the existing agricultural active ingredients can be encapsulated into chitosan nanocarriers for the formation of potent biocides against plant pathogens and pests; (2) the controlled release properties and high bioavailability of the nanoformulations help in minimizing the wastage and leaching of the agrochemicals’ active ingredients; (3) the small size, in the nanometer regime, enhances the penetration on the plant cell wall and cuticle, which in turn increases the argochemical uptake; (4) the encapsulation of agrochemicals in chitosan nanocarriers shields the toxic effect of the free agrochemicals on the plant, cells and DNA, thus, minimizing the negative impacts of agrochemical active ingredients on human health and environmental wellness. In addition, this article also briefly reviews the mechanism of action of chitosan against pathogens and the elicitations of plant immunity and defense response activities of chitosan-treated plants.

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A novel water-based chitosan-La pesticide nanocarrier enhancing defense responses in rice (Oryza sativa L) growth

Cited by 60 publications

References 45 publications

Chitosan Hydrochloride Decreases Fusarium graminearum Growth and Virulence and Boosts Growth, Development and Systemic Acquired Resistance in Two Durum Wheat Genotypes

Chitosan Hydrochloride Decreases Fusarium graminearum Growth and Virulence and Boosts Growth, Development and Systemic Acquired Resistance in Two Durum Wheat Genotypes

A Chitosan Composite Film Sprayed before Pathogen Infection Effectively Controls Postharvest Soft Rot in Kiwifruit

Chitosan-Based Agronanochemicals as a Sustainable Alternative in Crop Protection

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