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2012年49 No.5
Transcription analysis of mrjp9 in the honeybee Apis mellifera ligustica
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Key Words： honeybee，mrjp9，transcription，behavior，development
Abstract：Nine major royal jelly proteins (MRJPs1-9) were identified in the honeybee genome． Among these，MRJPs1-
5 were the main components of royal jelly protein and the functional basis of royal jelly． MRJPs6-9 are either not present，
or are less abundant，in royal jelly and their function remains unclear． To explore the possible function of MRJP9，Total
RNA was isolated from different body parts of honeybees at different developmental stages，and the expression of mrjp9
determined by RT-PCR． The results show that mrjp9 was widely expressed in all parts of honeybee at all developmental
stages． However，the level of mrjp9 expression was relatively low in larvae，pupae and early emerged adults，but relatively
high in foraging honeybees． Expression of mrjp9 was therefore related to developmental stage． In foraging honeybees，
expression of mrjp9 was particularly high in the head，thorax and hypopharyngeal gland，but less in other body parts or
tissues． Furthermore，mrjp9 was also expressed in multiple tissues of drone and queen honeybees and was not related to
sex or caste． The profile of mrjp9 expression coincided with honeybee behavioral development; expression was high in the
head and thorax which are the body parts directly related to foraging activity． Therefore，mrjp9 may be involved in the
behavioral development and division of labor in the honeybee．