Relationship between Histological Changes and Functions of the Neurosecretory Cells in the Brain of the Cabbage Armyworm, Mamestra brassicae L.

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The neurosecretory cells (NSC) in the brains of larvae destined for pupal diapause and of diapausing pupae of Mamestra brassicae were compared with those of larvae destined for pupal non-dispause and of non-diapausing pupae histologically and functionally. In the larval stage, the group I-NSC in the medial part of brain showed no differences in stainability with paraldehyde-fuchsin (AF) between the larvae destined for diapause and those for non-diapause. These NSC were stained well in early instars or at the end of the last instar but stained only slightly from the second to the fifth day of the last instar. In the pupal stage, the stainable neurosecretory material of the type II-NSC in medial part was apparent in the brain of diapausing pupae, but was much reduced in the brain of non-diapausing pupae. When NSC-ablated brains or NSC-clusters were implanted into dauer pupae or neck-ligated larvae to ascertain the role of NSC on adult development or pupation, both the medial NSC (MNC) and the lateral NSC (LNC) showed the activity secreting prothoracotropic hormone (PTTH), however, the activity of the MNC being higher than that of the LNC. These histological studies and implantation experiments indicate that the type II-NSC in the MNC of M. brassicae pupal brain may be able to secrete PTTH.

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