Comparison of resting egg gene expression with different hatchability related to salinity variations in the marine rotifer Brachionus manjavacas

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Salinity is a significant factor in affecting resting egg hatching in the euryhaline rotifers. In order to clarify the effects of salinity on resting egg hatchability, this study investigated gene expressions of resting eggs subjected to two different incubation salinities (at 17 and 33 ppt) in the rotifer Brachionus manjavacas. The resting eggs formed at 17 ppt showed a higher hatching rate at 17 ppt incubation salinity, compared to those at 33 ppt. Related to these circumstances, the resting eggs incubated at 17 ppt expressed genes which have putative functions implying cellular differentiation and embryonic development: late embryogenesis abundant protein (LEAs-1), α-amylase, and deaminase. The resting eggs incubated at 33 ppt highly expressed the genes related to the environmental stresses: AP2 transcription factors (AP2TF), and ATP decomposition: ABC transporter permease (ABC-TP), NAD + synthase, copper-translocating P-type ATPase (CTP-ATPase). It is expected that the resting eggs incubated at 33 ppt may need more energy (ATP) to endure saline stress during incubation. The obtained results indicated that the resting eggs regulate their hatching by allocating energy between embryo development and self-defense against environmental conditions like salinity stresses.


  • Fisheries science

    Fisheries science 84(4), 663-669, 2018-07

    [Springer Japan]


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