Action of low temperature on physiology of Sitophilus zeamais motschulsky and Sitophilus oryzae (L.) (Coleoptera: Curculionidae) in rice storage

Nakakita, Hiroshi; Ikenaga, Hiroshi

doi:10.1016/s0022-474x(96)00022-7

Cited by 36 publications

(17 citation statements)

References 13 publications

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“…It was observed that during the storage period, the respiratory rate of nuts with low-moisture content was always lower than that of highmoisture content nuts, while under the same moisture content, nuts stored at 738C had lower respiration as compared to nuts at 718C. These results were consistent with those reported previously by Dillahunty et al (2000) and Nakakita and Ikenaga (1997), who showed respiratory rate of rice reduced as the temperature decreased and increased as the moisture content increased. Thus, there was an interaction between moisture content and temperature on respiratory rate, the response of respiration to temperature was dependent on moisture content.…”

Section: Respiratory Ratesupporting

confidence: 90%

Changes in quality of low-moisture conditioned pine nut (Pinus gerardiana) under near freezing temperature storage

Cai

Liu

Ying

2013

CyTA - Journal of Food

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Changes in quality of low-moisture conditioned pine nut (Pinus gerardiana) under near freezing temperature storage Cambios en la calidad del piñ ón en condiciones de baja humedad (Pinus gerardiana) al almacenarlo a temperaturas cercanas al punto de congelación Changes in quality of low-moisture conditioned pine nuts (Pinus gerardiana) under near freezing temperature storage were investigated. Nuts were adjusted to different moisture content (17.3% + 0.42, 15.1% + 0.26, and 13.3% + 0.24) with 358C, 20%RH, sealed in air-tight jars and stored at 73 and 718C for 12 months. In general, free fatty acid content and peroxide value of the nuts increased, while sensory quality decreased during the storage. Low-moisture nuts had lower respiration, free fatty acid content, and peroxide value. Nuts stored at 738C had less visible mold infection and browning percentage than at 718C. Lowmoisture treatment exerted a slight negative effect on texture, but had significant preservative effects on color, odor, and taste during storage. Overall, integration of low-moisture conditioning and near freezing temperature storage can be a promising non-chemical way for maintaining the postharvest quality and extending shelf-life of pine nuts.Keywords: pine nut; low-moisture conditioning; freezing temperature; quality; shelf-life Se investigaron los cambios en la calidad de pin˜ones en condiciones de baja humedad (Pinus gerardiana), almacenados a temperaturas cercanas al punto de congelamiento. É stos fueron tratados con un contenido de humedad diferente (17,3% + 0,42, 15,1% + 0,26 y 13,3% + 0,24), con 358 C, 20% HR, sellados en frascos a prueba de aire y almacenados a 73 y 718 C durante 12 meses. En general, se constato´que, durante el almacenamiento, aumento´el contenido de su a´cido graso libre ası´como su valor de pero´xido, disminuyendo su calidad sensorial. Los pin˜ones almacenados con ma´s bajo nivel de humedad presentaron niveles de respiracio´n, a´cido graso libre y valor de pero´xido ma´s reducidos, en tanto que aquellos que se almacenaron a 738 C mostraron niveles de infeccio´n de moho visible y porcentajes de oscurecimiento menores que los almacenados a 718 C. El tratamiento para bajar la humedad tuvo un efecto negativo menor en la textura y surtio´efectos conservantes significativos en el color, el olor y el sabor durante el almacenamiento. En general, la integracio´n del tratamiento de baja humedad con el almacenamiento a temperaturas cercanas al punto de congelamiento puede ser un me´todo no quı´mico prometedor para preservar la calidad postcosecha y extender el periodo de conservacio´n de pin˜ones.Palabras clave: pin˜o´n; tratamiento de baja humedad; temperatura cercana al congelamiento; calidad; periodo de conservacio´n

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Section: Respiratory Ratesupporting

confidence: 90%

Changes in quality of low-moisture conditioned pine nut (Pinus gerardiana) under near freezing temperature storage

Cai

Liu

Ying

2013

CyTA - Journal of Food

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“…Also, at 32ЊC no F 1 maize weevils were found in either the untreated controls or the corn treated with DE. Maize weevils may be more cold tolerant and less heat tolerant compared with rice weevils (Nakakita and Ikenaga 1997), and 32ЊC is nearing the upper developmental threshold for maize weevil on corn (Throne 1994).…”

Section: Discussionmentioning

confidence: 97%

Efficacy of Diatomaceous Earth to Control Internal Infestations of Rice Weevil and Maize Weevil (Coleoptera: Curculionidae)

Arthur¹,

Throne²

2003

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Densities of 10, 20, and 30 hard red winter wheat kernels, Triticum aestivum L., were infested with different life stages of the rice weevil, Sitophilus oryzae (L.), mixed with 35 g of wheat treated with 300 ppm of the Protect-It (Mississauga, Ontario, Canada) formulation of diatomaceous earth (DE), and held at 22, 27, and 32 degrees C. A similar test was conducted by exposing densities of 6, 12, and 18 corn kernels infested with different life stages of the maize weevil, Sitophilus zeamais Motschulsky, mixed with 30 g of corn, Zea mays L., treated with 300 ppm of DE. Mortality of adults emerging from kernels in wheat treated with DE was always greater than controls, and ranged from 56 to 90% at 22 degrees C and was >90% at 27 and 32 degrees C. In most treatment combinations, exposure to DE suppressed F1 progeny by 60-90% relative to untreated controls. Mortality of adult maize weevils on treated corn held at 22 and 27 degrees C was lower than mortality of rice weevils on wheat, and ranged from 4 to 84%. F1 production was low in corn held at 22 degrees C, and no F1s were produced in either the controls or the treatments at 32 degrees C. In treated corn held at 27 degrees C, exposure to the DE suppressed F1 progeny by approximately 70-80% relative to the untreated controls. Results of this study show that rice weevils and maize weevils emerging from infested kernels as adults are susceptible to DE, and these results are comparable to other studies in which adult weevils were exposed directly on wheat or corn treated with DE. Although adult weevils will be killed by exposure to DE, some oviposition could still occur and progeny suppression may not be complete; however, application of DE to commodities already infested with internal feeders, such as the rice weevil and the maize weevil, could help eliminate or suppress the infestation.

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“…are mainly present during autumn and winter (Reimchen 1980). Macroinvertebrate piscivores such as Aeshna are resident throughout the year but should be more active during the higher temperatures of spring and summer (Agryopoulou and Stamou 1993;Nakakita and Ikenaga 1997). This may result in temporal variability in divergent selection.…”

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confidence: 99%

Temporal Variation in Divergent Selection on Spine Number in Threespine Stickleback

2002

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Abstract. Short-term temporal cycles in ecological pressures, such as shifts in predation regime, are widespread in nature yet estimates of temporal variation in the direction and intensity of natural selection are few. Previous work on threespine stickleback (Gasterosteus aculeatus) has revealed that dorsal and pelvic spines are a defense against gape-limited predators but may be detrimental against grappling insect predators. In this study, we examined a 15-year database from an endemic population of threespine stickleback to look for evidence of temporal shifts in exposure to these divergent predation regimes and correlated shifts in selection on spine number. For juveniles, we detected selection for increased spine number during winter when gape-limited avian piscivores were most common but selection for decreased spine number during summer when odonate predation was more common. For subadults and adults, which are taken primarily by avian piscivores, we predicted selection should generally be for increased spine number in all seasons. Among 59 comparisons, four selection differentials were significant (Bonferroni corrected) and in the predicted direction. However, there was also substantial variability in remaining differentials, including two examples with strong selection for spine reduction. These reversals were associated with increased tendency of the fish to shift to a benthic niche, as determined from examination of stomach contents. These dietary data suggest that increased encounter rates with odonate predation select for spine reduction. Strong selection on spine number was followed by changes in mean spine number during subsequent years and a standard quantitative genetic formula revealed that spine number has a heritable component. Our results provide evidence of rapid morphological responses to selection from predators and suggest that temporal variation in selection may help maintain variation within populations. Furthermore, our findings indicate that variable selection can be predicted if the agents of selection are known.

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Action of low temperature on physiology of Sitophilus zeamais motschulsky and Sitophilus oryzae (L.) (Coleoptera: Curculionidae) in rice storage

Cited by 36 publications

References 13 publications

Changes in quality of low-moisture conditioned pine nut (Pinus gerardiana) under near freezing temperature storage

Changes in quality of low-moisture conditioned pine nut (Pinus gerardiana) under near freezing temperature storage

Efficacy of Diatomaceous Earth to Control Internal Infestations of Rice Weevil and Maize Weevil (Coleoptera: Curculionidae)

Temporal Variation in Divergent Selection on Spine Number in Threespine Stickleback

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