Temporal changes in the leaf monoterpenes of Sequoia sempervirens |
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| Affiliation: | 1. International Centre for Genetic Engineering and Biotechnology (ICGEB), Padriciano 99, Italy;2. Fondazione Italiana Fegato-Onlus, Bldg. Q, AREA Science Park, ss14, Km 163.5, Basovizza, 34149 Trieste, Italy;1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, International Joint Laboratory for Regional Pollution Control, Ministry of Education (IJRC), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China;2. Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. School of Energy and Environment, City University of Hong Kong, Kowloon 999077, Hong Kong, China;4. Shenzhen Research Institue, City University of Hong Kong, Shenzhen 518057, China;5. China Automotive Technology and Research Center (CATARC), Beijing 100176, China;6. School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China;7. School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519000, China;8. Shanghai Police College, Shanghai 200137, China;9. TECHSHIP (Beijing) Technology Co., LTD, Beijing 100039, China;10. Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia |
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| Abstract: | Sequoia sempervirens leaf monotorpenes were analysed from bud burst through maturity. Significant changes occurred in both quantitative composition and total yield/dry wt during the first six months of leaf development. Composition then remained stable until initiation of twig abscission. Total yield also remained relatively stable except for a sharp increase at month 15, followed by a return to earlier levels and stability until initiation of abscission. The age of the shoot was important only for individuals less than 1 m high. Simulated herbivory by leaf removal showed only minor compositonal changes when plants were resampled one year later. Results support the concept that variation in individual compounds could provide an effective defensive strategy against herbivores and pathogens, and also establish a suitable time period for minimizing variation in sample collections. |
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