Egg maturation dynamics of the parasitoid <i>Microplitis rufiventris</i>: starvation speeds maturation in early life

Hegazi, E. M.; Khafagi, W. E.; Schlyter, Fredrik

doi:10.1111/phen.12027

Cited by 13 publications

(9 citation statements)

References 39 publications

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“…Tauber et al (1986) and Danks (1987) reported that diapause may be defined as a genetically programmed, neurohormonally mediated, dynamic state of low metabolic activity during which morphogenesis ceases or significantly slows down. M. rufiventris is synovigenic parasitoid that do not have a full complement of egg load at eclosion and that continue to mature eggs throughout adult life (Hegazi et al, 2013). The egg load in reservoir region varied significantly among wasps of different DIs which was probably related to the resorption processes among old and or new produced mature eggs in wasp's diapausing for longer period and producing new mature eggs for wasp's diapause for short or long period.…”

Section: Discussionmentioning

confidence: 99%

“…Mature ovarian eggs were found in the calyx (323.3±6.3 μm, eggs to be laid first) and reservoir regions (389.1±20.6 μm, ready for transfer to the calyx region by involuntary unidirectional movement of eggs). Oocyte production was determined by dissecting the ovaries of each female and recording the number of mature oocytes (Hegazi et al, 2013) ranged 320-385 μm long. We recorded the egg load by counting the mature number of eggs in the ovarioles at emergence time and at 24h post-emergence.…”

Section: Link Of Diapause Intensity To Post-diapause Reproductive Sucmentioning

confidence: 99%

“…Using two #0 insect micro-pins, the abdomen of each female was teased apart and ovaries removed. The number of mature eggs presents in the calyx region and the lateral oviducts egg reservoir were counted by teasing the tissues apart so that the individual eggs were released (Hegazi et al, 2013).…”

Section: Link Of Diapause Intensity To Post-diapause Reproductive Sucmentioning

confidence: 99%

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Persistent of low-level diapause and generation effect in Microplitis rufiventris wasps under mass rearing conditions

Khafagi¹,

Hegazi²,

Showil³

2020

J. Entomol. Nematol.

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The solitary endoparasitoid, Microplitis rufiventris is considered one of the principal wasps on the cotton leaf moth, Spodoptera littoralis larvae. It has a strange sort of obligate diapause. The data present an evidence of persistent low-level diapause throughout the year and every year that observed under mass rearing conditions. When continuous rearing was done throughout the year at 25°C and 12/12 h L/D, a small portion of the individuals in each large samples of each generation entered diapause. So, a long-timed experiment that repeated three years and collecting dataset that required regular extensive dissections and microscopic observations of emerged diapausing wasps was carried out. This diapause spontaneously terminates after time periods similar each year, showing an evidence of "time memory" in diapausing wasp behavior. The duration of this time period is taken as a proxy of diapause intensity. This had occurred whether the large number of individuals originated in summer from field-collected host larvae or from three successive years of laboratory-rearing parasitoids. Contrary to non diapausing wasps, diapausing females emerge some days early than males. This is the first report of new sort of obligate diapause in diapause induction and termination in M. rufiventris under the same constant rearing conditions. Fecundity of diapaused wasps was diapause intensity dependent. Wasps diapaused for 60-86 days (long diapause) have more number of mature eggs than either of those diapausing for short period (23-57 days) or those of longer diapause (90-165).

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Section: Discussionmentioning

confidence: 99%

Section: Link Of Diapause Intensity To Post-diapause Reproductive Sucmentioning

confidence: 99%

Section: Link Of Diapause Intensity To Post-diapause Reproductive Sucmentioning

confidence: 99%

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Persistent of low-level diapause and generation effect in Microplitis rufiventris wasps under mass rearing conditions

Khafagi¹,

Hegazi²,

Showil³

2020

J. Entomol. Nematol.

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“…Detailed information on the potential factors influ encing egg maturation dynamics of M. rufiventris wasp is lacking. Some effects on oviposition and feeding conditions are known (Hegazi et al 2013), but not the effects of a gradient of host availability. Knowledge of the oviposition-egg maturation behavior of M. ru fiventris may provide clues to designing efficient sys tems for rearing this parasitoid.…”

mentioning

confidence: 99%

Pattern of Egg Maturation and Oviposition forMicroplitis rufiventris(Hymenoptera: Braconidae) Wasps Given Different Schedules of Host Availability and Food Resources

Hegazi

Khafagi²,

Schlyter

2014

Annals of the Entomological Society of America

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The effects of the oviposition regime on egg maturation rate in the synovigenic parasitoid, Microplitis rufiventris Kokujev were investigated. In non-ovipositing wasps, females nor mally reach a peak of egg maturation rate on 1 d posteclosion. Egg maturation slowed down once the maximum oviduct egg load was reached on 2 d posteclosion. In wasps manipulated for 20 ovipositions per day, the egg maturation rate during the first 3 d posteclosion was lower compared with those manipulated for 40 ovipositions per day. The rate of egg maturation in 1-d-old wasps was found to be the highest for those that experienced 60 ovipositions per day. The maturation rate in females offered unlimited hosts was not significantly greater than those manipulated for 40 ovipositions per day. The act of oviposition significantly increased the rate of egg maturation and minimized egg resorption in the female wasp. The distribution of mature eggs in the ovaries at death is apparently associated with the oviposition regime. Trade-offs between egg maturation rate and female longevity were quite evident.

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“…This species is known as a biological control agent against Spodoptera frugiperda (Smith, 1797) (Coulson 1994). In the field, this parasitoid shows preference towards early larval instars (late first to early fourth) (Hegazi et al 2013). Some aspects of the reproductive biology of M. rufiventris were documented by Hegazi et al (2007).…”

mentioning

confidence: 99%

First record of Microplitis rufiventris Kokujev, 1914 (Braconidae: Microgastrinae) from Iran

Farahani¹,

Talebi²,

Achterberg³

et al. 2014

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Abstract:Occurrence of the genus Microplitis Forster (Braconidae, Microgastrinae) was surveyed in the Northern part of Iran. The specimens were collected using Malaise traps during 2010-2011. Two species, Microplitis rufiventris Kokujev, 1914 and M. ochraceus Szepligeti, 1896 were collected and identified of which the first species is newly recorded from Iran. Diagnostic characters and geographical distribution of the species are briefly discussed. (Yu et al. 2012).The genus Microplitis comprises a moderately small group, but the species have a worldwide distribution (Yu et al. 2012). This genus includes 178 described species worldwide, and approximately 77 species are found in the Palaearctic region (Yu et al. 2012). Member of the genus Microplitis are endoparasitoids of Lepidoptera, mainly Noctuidae (Wilkinson 1930;Yu et al. 2012; Gupta 2013). Janzen et al. (2003) studied the host specificity and hyperparasitism associated with Microplitis species in relation to sphingid hosts.The genus Microplitis was formerly classified under the genus Microgaster Latreille, 1804 with the type species Microgaster sordipes Nees (Telenga 1955). Species of the genus Microplitis were transferred to the new genus Glabromicroplitis by Papp (1979Papp ( , 1986. Nixon (1965) reclassified and reorganized the subfamily Microgastrinae. According to the subsequent studies, the genus Glabromicroplitis has been determined as a junior synonym of Microplitis (Austin and Dangerfield 1993). The genus can be recognized by the roughly sculptured propodeum, having a large areolet, shape and sculpture of the first metasomal tergite, and by the existence of a weak suture separating the second and third tergum (Mason 1981; Austin and Dangerfield 1993;Song and Chen 2008). Nixon (1970) revised 28 European Microplitis species. The Palaearctic species of the Microplitis were revised and keyed by Papp (1984), who recorded a total 68 species with description of seven new species. Gupta (2013) revised Indian Microplitis species and described one new species.Not much research has been done on the fauna of Microplitis in Iran. So far, six species of Microplitis have been recorded from Iran (Telenga 1955;Nixon 1968;Shenefelt 1973;Tobias 1976;Papp 1984; Fallahzadeh and Saghaei 2010; Ghahari et al. 2011a,b;Rastegar et al. 2012).Here, we present the first record of Microplitis rufiventris Kokujev, 1914 from Iran.Study material was collected from different habitats of Northern Iran during March to November of 2010 and 2011 using Malaise traps. The specimens were taken from the traps at weekly intervals. Later the dried specimens were card-mounted and labelled. Identifications were performed using keys by Papp (1984) and Tobias et al. (1986). The photographs were taken using an Olympus SZX9 stereomicroscope equipped with a Sony CCD digital camera. Morphological terminology follows van Achterberg (1993). The specimens are deposited in the insect collection of the Department of Entomology, Tarbiat Modares University, Tehran, Iran and the Naturalis Biodiversity ...

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Egg maturation dynamics of the parasitoid Microplitis rufiventris: starvation speeds maturation in early life

Cited by 13 publications

References 39 publications

Persistent of low-level diapause and generation effect in Microplitis rufiventris wasps under mass rearing conditions

Persistent of low-level diapause and generation effect in Microplitis rufiventris wasps under mass rearing conditions

Pattern of Egg Maturation and Oviposition forMicroplitis rufiventris(Hymenoptera: Braconidae) Wasps Given Different Schedules of Host Availability and Food Resources

First record of Microplitis rufiventris Kokujev, 1914 (Braconidae: Microgastrinae) from Iran

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