Effects of thermo-photoperiod on induction and termination of hibernation in<i>Chilo partellus</i>(Swinhoe)

Dhillon, Mukesh K.; Hasan, Fazil; Tanwar, Aditya K.; Bhadauriya, Amarpal Singh

doi:10.1017/s0007485316000870

Cited by 15 publications

(39 citation statements)

References 40 publications

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“…In this experiment, none of the larvae entered diapause. During this experiment, we observed some larvae with reduced body pigmentation (earlier described by Dhillon et al, ), wherein diet was getting dry. These larvae on receiving fresh diet transformed into pupae, indicating important role of food in termination of estivation in C. partellus .…”

Section: Methodssupporting

confidence: 62%

“…Rate of temperature change influences the physiological response, leading to change in morphological traits such as larval weight, length and head capsule width in C. partellus (Dhillon & Hasan, 2017b, ; Dhillon et al, ; Tamiru, Getu, Jembere, & Bruce, ). During present studies, these morphological traits were found significantly lower in diapausing than the nondiapausing larvae across test temperature and photoperiod conditions, which could be because of reduced feeding, energy loss due to construction of diapause chamber and reduction in body water content (Scheltes, ).…”

Section: Discussionmentioning

confidence: 99%

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Factors responsible for estivation in spotted stem borer, Chilo partellus (Swinhoe)

et al. 2019

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Diapause is an important adaptive trait in certain groups of insects at a particular stage, which contribute in controlling insect ecology, phenology, and physiology. Considering the importance of various factors in appropriate combinations, we studied effects of different temperature and photoperiod conditions on larval morphometrics, development, induction, and termination of estivation, and overall mortality due to estivation in Chilo partellus (Swinhoe). Weight, length, and head capsule width of C. partellus larvae significantly increased with increase in temperature and photoperiod treatments upto certain age and duration of exposure. According to Dyar's ratio, overall head capsule width progressed geometrically with minimum constant ratio of 1.20, and second‐degree polynomial regression equations were best fitted to all the test treatment conditions. The mortality of diapausing C. partellus individuals varied between 7.0% and 37.3% under different constant and varying temperature and photoperiod regimes, which at 38°C + 14L:10D reached upto 100.0%. However, the exposure to 30°C + 12.5L:11.5D and 32°C + 13L:11D along with dry food accelerated the process of estivation, wherein the diapause larval survival was significantly higher and overall mortality of individuals due to diapause was lower suggesting these conditions appropriate for induction of estivation in C. partellus. These studies have implications for better understanding the bioecology and population regulation system under varying climatic conditions and devising novel strategies for management of C. partellus.

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Section: Methodssupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Factors responsible for estivation in spotted stem borer, Chilo partellus (Swinhoe)

et al. 2019

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“…Diapause is a genetically programmed physiological state of arrested metabolic activity that is expressed at a particular stage of insects as a result of predictable unfavourable environmental factors (Tauber et al ., ; Dhillon et al ., ). Among these environmental factors, temperature plays an important and critical role in developmental biology, with a particular temperature range deciding the type of diapause, such as hibernation (Dhillon et al ., ) or aestivation (M. K. Dhillon, F. Hasan, A. K. Tanwar, A. P. S. Bhadauriya, unpublished data), as well as survival and its duration in insect species (Dhillon & Hasan, ). In insects, diapause has evolved as an important life‐history component that controls their ecology, phenology and physiology (Andrewartha, ; Xiao et al ., ; Hodek, ).…”

Section: Introductionmentioning

confidence: 99%

Consequences of diapause on post‐diapause development, reproductive physiology and population growth of Chilo partellus (Swinhoe)

Dhillon

Hasan

2018

Physiol. Entomol.

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We investigate the effects of diapause on post‐diapause development, reproductive physiology and population growth of Chilo partellus (Swinhoe) (Crambidae: Lepidoptera). Aestivating and hibernating larvae of C. partellus are exposed to diapause terminating conditions (consisting of an LD 12 : 12 h photocycle at 27 ± 1 °C and 65 ± 5% relative humidity with a fresh diet) to terminate the diapause and observations are made on percentage pupation, pupal duration and weight, adult reproductive performance and population growth parameters. We find that the diapause in C. partellus significantly reduces the percentage pupation and weights of pupae, ultimately lowering the weight and reproductive performance of adults. Reduced weights of adult females are found to be directly associated with a lower number of egg cells in ovaries. Nevertheless, the reproductive performance of C. partellus males is also found to be greatly affected in the diapause (hibernation and aestivation) experiencing population in terms of the deposition of a lower number of spermatophores and eupyrene sperm in the reproductive tracts of females compared with the nondiapausing population. The results of the present study clearly indicate that a reduction in longevity, fecundity and egg viability, as well as a reduced rate of deposition of spermatophores and eupyrene sperm, in a diapause experiencing population of C. partellus ultimately leads to a reduction in population growth parameters, thus having implications for bio‐ecology and population dynamics under a changing climatic scenario.

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“…On the basis of diapausing behavior, two ecological strains namely, North Indian and South Indian strains have been found to exist in India. The North Indian strain undergoes hibernation during winters, while South Indian strain undergoes aestivation during summers (Dhillon, Hasan, Tanwar, & Bhadauria, ; Dhillon & Hasan, , ). As a consequence of diapause, 17.2–28.3% and 14.7–40.0% population losses have also been recorded in hibernating and aestivating populations of C. partellus , respectively under laboratory conditions (Dhillon et al, ; Mukesh K. Dhillon, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

“…The North Indian strain undergoes hibernation during winters, while South Indian strain undergoes aestivation during summers (Dhillon, Hasan, Tanwar, & Bhadauria, ; Dhillon & Hasan, , ). As a consequence of diapause, 17.2–28.3% and 14.7–40.0% population losses have also been recorded in hibernating and aestivating populations of C. partellus , respectively under laboratory conditions (Dhillon et al, ; Mukesh K. Dhillon, unpublished data). These losses could be due to lightweight male and female pupae leading to less reproductive adults and disturbed sex ratio (Dhillon & Hasan, ).…”

Section: Introductionmentioning

confidence: 99%

Fitness consequences of delayed mating on reproductive performance of Chilo partellus (Swinhoe)

2018

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We investigated the effects of mating among different‐aged males and females on reproductive physiology, progeny production, and longevity of Chilo partellus (Swinhoe) adults under laboratory conditions. Present studies involved virgin males (M) and females (F) of three different ages namely, on the day of emergence (1D), next day (2D), and further next day (3D), thus comprising of a total of nine mating treatments (1DM × 1DF, 1DM × 2DF, 1DM × 3DF, 2DM × 1DF, 2DM × 2DF, 2DM × 3DF, 3DM × 1DF, 3DM × 2DF, and 3DM × 3DF). The observations were recorded on fecundity, fertility, hatchability, and longevity of male and female adults. We found that mating among old aged males and females significantly reduce fecundity, fertility, and egg hatchability. Further, the fecundity, fertility, and egg hatching were significantly higher when newly emerged females mated with either of the ages of males as compared with other mating treatments. Conversely, the 3‐day‐old females, when mated with either of the ages of males, laid more numbers of unfertilized eggs, thus reduction in egg hatchability. Mating among newly emerged adults significantly reduced the longevity of male and female adults. Kaplan–Meier estimation showed that none of the adults across mating treatments survived more than 6 days. The recovery of spermatophores from the reproductive tract of females from 3DM × 1DF were significantly higher than other mating treatments. However, no association was found between spermatophore recovery and longevity of male and female adults. Findings of present studies will help to devise appropriate techniques to disrupt mating and suppress C. partellus population under field conditions.

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Effects of thermo-photoperiod on induction and termination of hibernation inChilo partellus(Swinhoe)

Cited by 15 publications

References 40 publications

Factors responsible for estivation in spotted stem borer, Chilo partellus (Swinhoe)

Factors responsible for estivation in spotted stem borer, Chilo partellus (Swinhoe)

Consequences of diapause on post‐diapause development, reproductive physiology and population growth of Chilo partellus (Swinhoe)

Fitness consequences of delayed mating on reproductive performance of Chilo partellus (Swinhoe)

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