Effects of fungicide applications on root-infecting microorganisms and overwintering survival of perennial stevia

Koehler, Alyssa; Shew, H. D.

doi:10.1016/j.cropro.2019.02.010

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Based on the above, novel fungicides with enhanced performance, low toxicity, and less residue are urgently required for sustainable agriculture 10 . Natural products and their derivatives have unique biocompatibility, novel structural skeletons, and broad biological activities and are still an important fountainhead of developing pesticides today 11 …”

Section: Introductionmentioning

confidence: 99%

Discovery of rosin‐based acylhydrazone derivatives as potential antifungal agents against rice Rhizoctonia solani for sustainable crop protection

Chen

et al. 2022

Pest Management Science

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BACKGROUND The use of fungicides to protect crops from diseases is an effective method, and novel environmentally friendly plant‐derived fungicides with enhanced performance and low toxicity are urgent requirements for sustainable agriculture. RESULTS Two kinds of rosin‐based acylhydrazone compounds were designed and prepared. Based on the antifungal activity assessment against Rhizoctonia solani, Fusarium oxysporum, Phytophthora capsici, Sclerotinia sclerotiorum, and Botrytis cinerea, acylhydrazone derivatives containing a thiophene ring were screened and showed an inhibitory effect on rice R. solani. Among them, Compound 4n, with an electron‐withdrawing group on the benzene ring structure attached to the thiophene ring, showed optimal activity, and the EC50 value was 0.981 mg L−1, which was lower than that of carbendazim. Furthermore, it was indicated that 4n could affect the mycelial morphology, cell membrane permeability and microstructure, cause the generation of reactive oxygen species in fungal cells, and damage the nucleus and mitochondrial physiological function, resulting in the cell death of R. solani. Meanwhile, Compound 4n exhibited a better therapeutic effect on in vivo rice plants. However, the induction activity of 4n on the defense enzyme in rice leaf sheaths showed that 4n stimulates the initial resistance of rice plants by removing active oxygen, thereby protecting the cell membrane or enhancing the strength of the cell wall. Through the quantitative structure–activity relationship study, the quantitative chemical and electrostatic descriptors significantly affect the binding of 4n with the receptor, which improves its antifungal activity. CONCLUSION This study provides a basis for exploiting potential rosin‐based fungicides in promoting sustainable crop protection. © 2022 Society of Chemical Industry.

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Section: Introductionmentioning

confidence: 99%

Discovery of rosin‐based acylhydrazone derivatives as potential antifungal agents against rice Rhizoctonia solani for sustainable crop protection

Chen

et al. 2022

Pest Management Science

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“…Fungicides, which are among the most important types of pesticides, can control plant diseases caused by various pathogenic microorganisms by killing or inhibiting the growth of pathogens . In fact, the use of fungicides has become one of the most economical and effective ways to reduce the huge losses in agriculture caused by plant diseases …”

Section: Introductionmentioning

confidence: 99%

“…3 In fact, the use of fungicides has become one of the most economical and effective ways to reduce the huge losses in agriculture caused by plant diseases. 4 Over recent years, the new fungicides have become the research hot spot, resulting in development of fungicides with novel mechanisms. 5 Among them, succinate dehydrogenase inhibitors (SDHIs) are the most innovative ones because of their high efficiency, broad spectrum, and novel mechanism.…”

Section: ■ Introductionmentioning

confidence: 99%

Antifungal Application of Rosin Derivatives from Renewable Pine Resin in Crop Protection

Pan

Jiang

et al. 2020

J. Agric. Food Chem.

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In the current work, we synthesized two series of dehydroabietyl amide derivatives from natural product rosin and evaluated their antifungal effects on Valsa mali, Phytophthora capsici, Botrytis cinerea, Sclerotinia sclerotiorum, and Fusarium oxysporum. In vitro and in vivo antifungal activities results indicated that rosin-based amide compounds containing thiophene heterocycles had better inhibitory effects on B. cinerea. In particular, compound 5b (5-fluoro-2-thiophene dehydroabietyl amide) exhibited the excellent antifungal properties against B. cinerea with an EC 50 of 0.490 mg/L, which was lower compared to the positive control penthiopyrad (0.562 mg/L). Physiological and biochemical studies showed that the primary action mechanism of compound 5b on B. cinerea changes mycelial morphology, increases cell membrane permeability, and inhibits the TCA pathway in respiratory metabolism. Furthermore, QSAR and SAR studies revealed that charge distribution of rosin-based amides derivatives have a key role in the antifungal activity through the hydrogen bonding, conjugation, and electrostatic interaction between the compounds and the receptors of the target. To sum up, this study contributes to the development of rosin-based antifungal agents with a novel structure and preferable biological activity.

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Nondestructive Sampling to Monitor Macrophomina phaseolina Root Colonization in Overwintering Stevia

Rogers

Koehler

2021

Plant Health Progress

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Macrophomina phaseolina is a soilborne fungal pathogen in the family Botryosphaeriaceae. Microsclerotia of M. phaseolina were first observed at the base of overwintering stevia stems in North Carolina in spring 2016. Previous studies utilized destructive sampling methods to monitor M. phaseolina in stevia fields; however, these methods are not feasible for long-term monitoring of disease in a perennial system. In the current study, nondestructive root soil-core sampling was conducted during overwintering months, from October 2018 to January 2020, to monitor M. phaseolina root colonization in stevia in Rocky Mount, NC. Two-inch-diameter soil cores were collected through the root zone, and fresh weight of roots was recorded for each soil core. M. phaseolina recovery was evaluated by examining mycelial growth from roots plated onto potato dextrose agar. There was no significant effect of sample weight on M. phaseolina across all dates, but there was one date for which sample weight had a significant effect on recovery (P = 0.01; α = 0.05). For both recovery and sample weight, sampling date was a significant predictor (P = 1.68e-5 and P = 0.0389, respectively; α = 0.05). Weather and climate data revealed that dates with no M. phaseolina recovery had lowest mean air and soil temperatures and the greatest number of days below freezing in the month prior to sampling. In separate sampling years, October sampling dates had the highest recovery of M. phaseolina. Future field trials should determine if October samplings can predict survival and vigor of reemerging stevia plants.

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Effects of fungicide applications on root-infecting microorganisms and overwintering survival of perennial stevia

Cited by 4 publications

References 26 publications

Discovery of rosin‐based acylhydrazone derivatives as potential antifungal agents against rice Rhizoctonia solani for sustainable crop protection

Discovery of rosin‐based acylhydrazone derivatives as potential antifungal agents against rice Rhizoctonia solani for sustainable crop protection

Antifungal Application of Rosin Derivatives from Renewable Pine Resin in Crop Protection

Nondestructive Sampling to Monitor Macrophomina phaseolina Root Colonization in Overwintering Stevia

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