Oogenesis in<i>Kalotermes flavicollis</i>(Fabr.) (Isoptera: Kalotermitidae). I. Differentiation and maturation of oocytes in female supplementary reproductives

Grandi, Gilberto; Barbieri, Roberta; Colombo, G.

doi:10.1080/11250008809386606

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…The Kalotermes flavicollis ovary is formed by 6-7 panoistic ovarioles, each consisting of linear array of oogonia and oocytes in an ordered succession of differentiation and growth. The ultrastructural changes of germ cells, from early oogonia to egg at the end of oogenesis, have been reported in a previous paper (Grandi et al, 1988). The germ cells are always enveloped by somatic cells, of the same cell lineage, that change structure and function in relation to the differentiation stage of the germ cell.…”

Section: Introductionmentioning

confidence: 57%

“…Female supplementary reproductives were used in this study. The fixative, the fixation and stain procedures on sections analyzed by optical and transmission electron microscopy were identical to those described in an earlier paper (Grandi et al, 1988).…”

Section: Methodsmentioning

confidence: 99%

“…17). The apical part of the follicular cell extends toward the oocyte with thick branched microvilli, some of which deeply penetrate in the cortical ooplasm and are lodged in oolemma depressions (Grandi et al, 1988).…”

Section: Vitellogenic Stagementioning

confidence: 99%

“…The presence of endocytotic pits and vesicles of small size in the cortical ooplasm of previtellogenic oocyte (Grandi et al, 1988) suggests that at this stage the oocyte takes up by micropinocytosis material produced by follicular cells.…”

Section: Flavicollismentioning

confidence: 99%

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Oogenesis inKalotermes flavicollis(Fabr.) (Isoptera: Kalotermitidae). II‐prefollicular and follicular cell ultrastructure during oogenesis in female supplementary reproductives

Grandi

1988

Bolletino di zoologia

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Ovariole somatic cells were examined by light and electron microscopy. Prefollicular, follicular and interfollicular cells were identified. Prefollicular cells envelop oogonia and oocytes at the beginning of meiosis; they have a scarcely differentiated cytoplasm with protrusions penetrating between germ cells and between these and the tunica propria. Follicular cells form a flattened epithelium around initial previtellogenic oocytes, and during previtellogenic growth they proliferate and change from flattened to cuboidal and then columnar shape. They adhere tightly to each other and apically form microvilli which extensively interlock with oocyte microvilli. During vitellogenesis, the follicular cells show a globose shape; wide intercellular spaces appear between adjacent cells and between follicular cells and the oocyte. Their cytoplasm becomes enriched in rough endoplasmic reticulum cisternae, Golgi complexes, mitochondria and microtubules, particularly near the basal area. At the end of vitellogenesis the follicular cells are flattened and very wide, and earlier intercellular spaces have disappeared. From the last previtellogenic stages to the end of oocyte development, the ovarian follicles are separated by interfollicular cells anchored to the tunica propria and characterized by the presence of numerous microtubules in the cytoplasm. The function of the ovariole somatic cells is discussed in relation to the stages of oocyte differentiation and growth.

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Section: Introductionmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 99%

Section: Vitellogenic Stagementioning

confidence: 99%

Section: Flavicollismentioning

confidence: 99%

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Oogenesis inKalotermes flavicollis(Fabr.) (Isoptera: Kalotermitidae). II‐prefollicular and follicular cell ultrastructure during oogenesis in female supplementary reproductives

Grandi

1988

Bolletino di zoologia

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“…One means by which a reproductive male may influence a primary female's maturation is by enhancing her nutritional state through dietary supplements and assisting with colony labour (Light, 1942–43; Shellman‐Reeve, 1990), thereby increasing her ability to dedicate resources towards development. Resource accumulation is crucial during colony establishment, ensuring that reproductives have sufficient reserves for oogenesis, brood care and nest maintenance (LaFage & Nutting, 1978; Grandi et al ., 1988; Shellman‐Reeve, 1996). If the change in body mass is an accurate indicator of female nutritional state, then the significant correlations between body mass, ovariole number and fecundity for females nesting with males may indicate that nutritional state determines the extent of development possible.…”

Section: Discussionmentioning

confidence: 97%

Influence of sex‐specific stimuli on ovarian maturation in primary and secondary reproductives of the dampwood termite Zootermopsis angusticollis

Brent

Traniello

2001

Physiological Entomology

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Abstract. It was hypothesized that female primary and secondary reproductives of the termite Zootermopsis angusticollis Hagen require sex‐specific stimuli from a reproductive male to trigger ovarian maturation. To test this hypothesis, experimental laboratory colonies were established that contained female primary or secondary reproductives nesting: alone; with a male; with a female; and with three third‐ to fourth‐instar larvae. Following colony initiation, we measured changes in body mass, ovariole number and fecundity over 60 days. Results indicate that the reproductive maturation of female primaries was promoted by contact with a male but inhibited by the presence of another female. Secondary females were not affected by the presence of another reproductive, regardless of sex, but the development of reproductive competency of primary females appeared to depend on male‐specific stimulation. Reliance on male–female interaction to induce female reproductive development may ensure that the resources of newly dealate females are not wasted on producing larvae that would have a poor chance of surviving in the absence of a male. By contrast, secondary females maturing within established colonies are likely to have a mate and immediate assistance with non‐reproductive tasks, and therefore do not delay ovarian maturation and reproduction until they perceive male‐specific stimuli. These results demonstrate that male‐specific stimuli affect only the reproductive development of primary females, and suggest that the degree to which primary and secondary females depend on mate assistance may have shaped their physiological responses to the presence of a reproductive male.

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Reproductive organ development along the caste differentiation pathways in the dampwood termite Hodotermopsis sjostedti

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Oogenesis inKalotermes flavicollis(Fabr.) (Isoptera: Kalotermitidae). I. Differentiation and maturation of oocytes in female supplementary reproductives

Abstract: Oogenesis in Kalotermes flavicollis (Fabr.) (Isoptera: Kalotermitidae). I. Differentiation and maturation of oocytes in female supplementary reproductives

Cited by 15 publications

References 30 publications

Oogenesis inKalotermes flavicollis(Fabr.) (Isoptera: Kalotermitidae). II‐prefollicular and follicular cell ultrastructure during oogenesis in female supplementary reproductives

Oogenesis inKalotermes flavicollis(Fabr.) (Isoptera: Kalotermitidae). II‐prefollicular and follicular cell ultrastructure during oogenesis in female supplementary reproductives

Influence of sex‐specific stimuli on ovarian maturation in primary and secondary reproductives of the dampwood termite Zootermopsis angusticollis

Reproductive organ development along the caste differentiation pathways in the dampwood termite Hodotermopsis sjostedti

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