| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4524665 | Journal of Asia-Pacific Entomology | 2015 | 9 Pages |
•Ovary development and the secretion of vitellogenin are stage-specific in O. cornifrons.•Ovarian development shows a significant interaction with the secretion of OcVg.•During wintering, the number of oocytes increased and correlated with OcVg secretion.•After wintering, the oocyte and ovary strongly correlated with OcVg secretion.
The Osmia cornifrons bee plays an important role in pollinating fruit trees, such as apple trees. To better understand diapause and oviposition in O. cornifrons, we investigated the correlation between ovarian development and the secretion level of OcVg protein in hemolymph. During ovarian development in wintering, the number of oocytes progressively increased compared with the length of the ovaries and the oocytes. After wintering, the oocyte and ovary sizes developed up to 6 days after emergence and declined after 6 days, but the number of oocytes decreased gradually. The secretion level of OcVg protein in the hemolymph revealed that during wintering, the secretion level increased from month 1 to month 2 and then stagnated after 2 months. After diapause, the secretion level increased gradually until day 6 of the newly emerged adult from the cocoon stage and thereafter gradually declined, remaining detectable until day 30 of the adult stage. The correction analysis between ovarian development and OcVg secretion level in the hemolymph showed that during wintering, the number of oocytes positively correlated with the OcVg secretion level. After diapause, the lengths of the ovary and first oocyte and the number of oocytes showed significant changes in the OcVg secretion level and strongly correlated with the OcVg secretion level, respectively. These results suggest that there is a significant interaction between ovarian development and the secretion level of OcVg protein and that the pattern of ovarian development and the secretion of OcVg protein are stage-specific in the O. cornifrons female.
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