Cotton aphid infests more than 700 plants and a major pest of various horticultural crops worldwide. The glucose regulated protein 78 (GRP78) is a member of heat shock protein 70. Its expression is associated with the nutritional changes as well as environmental stresses. The full sequences of grp78 cDNA of Aphis gossypii was determined. It had conserved motifs of hsp genes and terminated in KDEL which is common to GRP78. Quantitative realtime PCR showed that its level was changed during development and also upregulated by starvation. However, its level was not much changed by heat stress. The level of grp78 can be use to understand nutritional physiology on insects.

• Sang-Mok Cha(Department of Applied Bioscience, Kyung-pook National University)
• Jae-Kyoung Shim(Department of Applied Bioscience, Kyung-pook National University)
• Kyeong-Yeoll Lee(Department of Applied Bioscience, Kyung-pook National University, Institute of Plant Medicine, Kyungpook National University)