Responses of midgut amylases of Helicoverpa armigera to feeding on various host plants

Kotkar, Hemlata M; Sarate, P.J.; Tamhane, Vaijayanti A.; Gupta, Vidya S.; Giri, Ashok P.

doi:10.1016/j.jinsphys.2009.05.004

Cited by 104 publications

(103 citation statements)

References 47 publications

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“…Artificial diets are usually complete nourishments formed for high insect performance and commonly considered to be better than natural diets (Hari et al, 2007). According to Kotkar et al (2009) H. armigera fed on artificial diet completed its life cycle somewhat early compared with natural diets. Among different soybean cultivars, the highest general proteolytic activity was in the larvae reared on L17, M4 and Sahar, indicating the presence of some PIs on these cultivars, leading to hyperproduction of proteases by midgut cells of H. armigera in response to protease inhibition by PIs.…”

Section: Resultsmentioning

confidence: 99%

“…However, the amylolytic activity was the highest on M4 and lowest on Williams and DPX. Kotkar et al (2009) have indicated that natural diet-fed H. armigera had three times lower gut amylase activities compared with those fed on artificial diet. It was also reported by above-mentioned researchers that the larvae reared on legume and vegetable crops showed double gut amylolytic activity than those fed on ornamental and cereal crops.…”

Section: Resultsmentioning

confidence: 99%

“…Protease and α-amylase activities in crude extracts of larval guts of H. armigera have been described by some researchers (e.g. Patankar et al, 2001;Chougule et al, 2005;Kotkar et al, 2009). …”

Section: Soybean Cultivars Pods Affecting Digestive Proteolytic and Amentioning

confidence: 98%

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Soybean Cultivars Affecting Performance of Helicoverpa armigera (Lepidoptera: Noctuidae)

Fathipour¹,

Naseri²

2011

Soybean - Biochemistry, Chemistry and Physiology

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Soybean Cultivars Affecting Performance of Helicoverpa armigera (Lepidoptera: Noctuidae)

Fathipour¹,

Naseri²

2011

Soybean - Biochemistry, Chemistry and Physiology

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“…Thus, when foods differ not only in the absolute concentration of nutrients but also in their relative amounts, the relationship between substrate and enzyme activity shows no consistent pattern (e.g. Ishaaya et al 1971;Kotkar et al 2009;Woodring et al 2009), and the untested possibility remains that under circumstances of nutrient imbalance there may be homeostatic secretion of digestive enzymes, with enzymes for nutrients in excess being secreted at lower rates than enzymes for nutrients in deficit. Consistent with such a possibility are results showing that after pharmacological disruption of digestive enzymes by proteinase inhibitors administered in the food, caterpillars responded within 2 h to compensate for the loss of enzymatic function by increasing the production of endogenous enzymes or secreting novel proteases (e.g.…”

Section: Introductionmentioning

confidence: 99%

The gastrointestinal tract as a nutrient-balancing organ

et al. 2010

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Failure to provision tissues with an appropriate balance of nutrients engenders fitness costs. Maintaining nutrient balance can be achieved by adjusting the selection and consumption of foods, but this may not be possible when the nutritional environment is limiting. Under such circumstances, rebalancing of an imbalanced nutrient intake requires post-ingestive mechanisms. The first stage at which such postingestive rebalancing might occur is within the gastrointestinal tract (GIT), by differential release of digestive enzymes-releasing less of those enzymes for nutrients present in excess while maintaining or boosting levels of enzymes for nutrients in deficit. Here, we use an insect herbivore, the locust, to show for the first time that such compensatory responses occur within the GIT. Furthermore, we show that differential release of proteases and carbohydrases in response to nutritional state translate into differential extraction of macronutrients from host plants. The prevailing view is that physiological and structural plasticity in the GIT serves to maximize the rate of nutrient gain in relation to costs of maintaining the GIT; our findings show that GIT plasticity is integral to the maintenance of nutrient balance.

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“…Recently this situation has been aggravated by the introduction of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae), a pest that has great potential for damage to various crops (Kotkar et al, 2009;Czepak et al, 2013).…”

Section: Author(s) Agree That This Article Remain Permanently Open Acmentioning

confidence: 99%

Toxicity and sublethal effects of insecticides on Helicoverpa armigera Hbner (Lepidoptera: Noctuidae)

Carneiro¹,

Silva²,

Silva³

et al. 2016

Afr. J. Agric. Res.

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Exposure of Helicoverpa armigera to sublethal concentrations of insecticides can cause physiological deficiencies manifested by reduced longevity, development, fertility and fecundity. Research on the sub-lethal effects, to identify the non-lethal negative impacts of insecticides on pests can provide practical information for integrated management. The objective of this study was to determine the lethal concentrations and sublethal effects of insecticides on larval development and reproduction of H. armigera. The insecticides were diluted in water and applied via immersion of soybean leaf discs directly in the solution for three second, subsequently provided to the larvae maintained under controlled conditions for a period of 48 h. For surviving larvae, artificial diet was provided with daily evaluation until pupation. The pupae obtained were weighed after 24 h and transferred to Petri dishes, covered with filter paper until the adult phase, to evaluate longevity and pupal viability. For the assessments related to oviposition, couples were separated in polyvinyl chloride (PVC) cages and fed with 10% honey solution; the counting of eggs was done every two days, until the end of the oviposition period. All of the insecticides tested presented lethal and sublethal effects on the parameters weight, mortality and pupal viability and reduced oviposition and can be used in pest management, representing an alternative in the product rotation for the control of the third instar of H. armigera.

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Responses of midgut amylases of Helicoverpa armigera to feeding on various host plants

Cited by 104 publications

References 47 publications

Soybean Cultivars Affecting Performance of Helicoverpa armigera (Lepidoptera: Noctuidae)

Soybean Cultivars Affecting Performance of Helicoverpa armigera (Lepidoptera: Noctuidae)

The gastrointestinal tract as a nutrient-balancing organ

Toxicity and sublethal effects of insecticides on Helicoverpa armigera Hbner (Lepidoptera: Noctuidae)

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