Diamondback moth (iPlutella xylostella/i) management.

Fathipour, Yaghoub; Mirhosseini, M. A.

doi:10.1079/9781780648200.0013

Cited by 15 publications

(10 citation statements)

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“…Eventually, we found fresh leaves of “Purple Flower‐Soft Pod” cultivar were generally suitable with 17% P. xylostella survival rate of immature stages in the 1st generation. One possible reason is the bottom‐up effects of Brassica cultivars or genotypes on the performance of P. xylostella (Fathipour et al., 2019; Fathipour & Mirhosseini, 2017; Kianpour et al., 2014; Nikooei et al., 2015; Soufbaf et al., 2010). Löhr and Gathu (2002) found that the survival rate increased to 49.7% in the 4th generation.…”

Section: Discussionmentioning

confidence: 99%

Fitness comparison of Plutella xylostella on original and marginal hosts using age‐stage, two‐sex life tables

Yang

Chen

Ruan

et al. 2021

Ecology and Evolution

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Section: Discussionmentioning

confidence: 99%

Fitness comparison of Plutella xylostella on original and marginal hosts using age‐stage, two‐sex life tables

Yang

Chen

Ruan

et al. 2021

Ecology and Evolution

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“…Significant differences among nutritional indices of H. armigera feeding on the different concentrations of Btk‐mixed diet suggest that the diet does not have the same nutritional value for H. armigera (Nathan et al , ). Among the nutritional indices, ECD represents the efficiency of digested food for growth and development of the insect for energy production (Naseri et al , ; Soleimannejad et al , ; Fathipour & Mirhosseini, ). Therefore, the constant ECD indicates that the diet was not toxic or harmful for the insects (Koul et al , ).…”

Section: Discussionmentioning

confidence: 99%

Increased food utilization indices and decreased proteolytic activity in Helicoverpa armigera larvae fed sublethal Bacillus thuringiensis‐treated diet

et al. 2019

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The cotton bollworm Helicoverpa armigera is one of the most devastating insect pests. A set of protease enzymes allows this species to feed on different host plant species. Control measures in agriculture often involve the application of the pathogenic bacterium Bacillus thuringiensis subsp. kurstaki (Btk). In the present study, the effects of sublethal Btk doses are evaluated with respect to the food utilization indices and proteolytic activities of Helicoverpa armigera. Accordingly, the H. armigera larvae are fed with artificial diet containing sublethal Btk doses (LC 5 , LC 10 , LC 15 , LC 20 and LC 25 ) and a Btk-free diet as control. All but one of the food utilization indices we measured is observed to increase significantly with increasing Btk doses. By contrast, the specific activity of total protease, chymotrypsin and elastase enzymes decrease significantly with an increasing Btk concentration. We conclude that Btk was not toxic to H. armigera larvae and any damage that it causes can be compensated for by H. armigera larvae via various mechanisms. In conclusion, increased nutritional indices in the larvae fed with Btk diet represent an important issue that needs to be considered to avoid the pest establishing Bt resistant populations. Meanwhile, the lack of effect of Btk sublethal concentrations on trypsin enzyme specific activity can bolster this challenge.

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“…We conducted a study comparing the effects of pre- and mature ds conformations. We used Brassicaceae crops’ serious pest Plutella xylostella (L.) (Lepidoptera: Plutellidae) as a model (Fathipour and Mirhosseini 2017; Li et al 2021; Zalucki et al 2012). Besides being an agro-economic threat, P. xylostella showed the presence of plant-derived miRNAs in the larval hemolymph (Zhang et al 2019), indicating an uptake of dietary miRNAs and posing it as a promising model system to understand the effects of ingested pre- and mature-miRNAs.…”

Section: Introductionmentioning

confidence: 99%

Trophic microRNA: Precursor and mature microRNA ingestion downregulates the target transcripts and hampers larval development inPlutella xylostella

Bardapurkar,

Pandit

2023

Preprint

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MicroRNAs (miRNAs) are post-transcriptional gene regulators. In the miRNA pathway’s cytoplasmic part, the miRNA is processed from a hairpin-structured precursor (pre-miRNA) to a double-stranded (ds) mature RNA and ultimately to a single-stranded mature miRNA. In insects, ingesting these two ds forms can regulate the target gene expression; this inspired the trophic miRNA’s use as a functional genomics and pest management tool. However, systematic studies enabling comparisons of pre- and mature forms, dosages, administration times, and instar-wise effects on target transcripts and phenotypes, which can help develop a miRNA administration method, are unavailable due to the different focuses of the previous investigations. We investigated the impact of trophically deliveredPx-let-7 miRNA on the Brassicaceae pest,Plutella xylostella, to compare the efficacies of its pre- and ds-mature forms. Continuous feeding on the miRNA-supplemented diet suppressed expressions ofFTZ-F1andE74, the target ecdysone pathway genes. Both the pre-let-7 and mature let-7 miRNA forms similarly downregulated the target transcripts in all four larval instars. Pre-let-7 and let-7 ingestions decreasedP. xylostella’s larval mass and instar duration and increased mortality in all instars, exhibiting adverse effects on larval growth and development. Pre-miRNA processingDicer-1was upregulated upon pre-let-7 ingestion, indicating the miRNA uptake by the midgut cells. The scrambled sequence controls did not affect the target transcripts, suggesting the sequence-specific targeting by the mature miRNA and hairpin cassette’s non-involvement in the target downregulation. This work provides a framework for miRNA and target gene function analyses and potentiates the trophic miRNA’s utility in pest management.

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Diamondback moth (iPlutella xylostella/i) management.

Cited by 15 publications

References 0 publications

Fitness comparison of Plutella xylostella on original and marginal hosts using age‐stage, two‐sex life tables

Fitness comparison of Plutella xylostella on original and marginal hosts using age‐stage, two‐sex life tables

Increased food utilization indices and decreased proteolytic activity in Helicoverpa armigera larvae fed sublethal Bacillus thuringiensis‐treated diet

Trophic microRNA: Precursor and mature microRNA ingestion downregulates the target transcripts and hampers larval development inPlutella xylostella

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