Relationship between brain trehalase activity and trehalosema during direct and diapausing development in Pieris brassicae |
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| Institution: | 1. UA CNRS 1138, Laboratoire de Physiologie Animale “Métabolisme”, Université de Bordeaux T, avenue des Facultés 33405 Talence Cedex, France (Tel: 16 56 80 6800);2. Laboratoire de Biochimie INRA-AVIGNON, 84140 Montfavet, France;1. Engineering Research Center for Biomass Resource Utilization and Modification of Sichuan Province, Southwest University of Science and Technology, Mianyang 621010, China;2. School of Life Science and Technology, Mianyang Teachers’ College, Mianyang 621000, China;3. Department of Horticulture, Faculty of Agriculture, Lasbela University of Agriculture, Water and Marine Sciences, Uthal, Balochistan, Pakistan;1. Department of Molecular Biology and Genetics, Science Faculty, Erzurum Technical University, Erzurum, Turkey;2. Department of Medical Biology, Faculty of Medicine, Giresun University, Giresun, Turkey;1. School of Life Sciences, State Key Laboratory of Agrobiotechnology and Centre for Soybean Research, Chinese University of Hong Kong, Shatin, Hong Kong;2. The Hong Kong Institute of Vocational Education, Chaiwan, Hong Kong;3. Department of Biology, Queen’s University, Kingston, ON, Canada;4. Department of Cell and Systems Biology, University of Toronto, M5S 3G5, Canada;1. Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China;2. Department of Plant Protection, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China |
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| Abstract: | - 1.1. Brain trehalase specific activity and trehalosemia were measured during the end of the developmental life cycle in non-diapausing and diapausing insects.
- 2.2. During non-diapausing development, trehalosemia reached maximum values at the beginning of pupal life. Then a constant decrease was observed up to the end of adult life.
- 3.3. The specific activity of brain trehalase was maximum when the insects were in active feeding periods, minimum activity appearing during moulting phases.
- 4.4. During diapausing development, trehalosemia was very high at the beginning of pupal life, particularly when insects were exposed to wintering conditions.
- 5.5. When diapause was broken, trehalosemia fell, announcing adult emergence.
- 6.6. Brain trehalase activity showed the same qualitative variations as in non-diapausing larvae, but with rather lower values.
- 7.7. During pupal life, brain trehalase activity decreased markedly during the long period necessary to obtain diapause breakdown.
- 8.8. Wintering conditions allow a progressive increase of brain trehalase activity, which preceded the fall of trehalosemia.
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