Characterization of Sardinian cork oak (<Emphasis Type="Italic">Quercus suber</Emphasis> L.) genetic resources for economically important traits |
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Authors: | Simonetta Bullitta Sandro Dettori Manuela Manchinu Maria Rosaria Filigheddu Giovanna Piluzza |
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Institution: | 1.CNR-ISPAAM u.o.s. Sassari,Li Punti-Sassari,Italy;2.Department of Economics and Woody Plant Ecosystems (DESA),Sassari,Italy |
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Abstract: | Considering the very high socio economic value of cork oak (Quercus suber L.) in Mediterranean areas, a better knowledge of local genetic resources is necessary in order to reach a good balance between
the conservation issues and the need of an efficient cork production network. In such frame, local germplasm of Q. suber from the main cork production areas of Sardinia was analysed for DNA and isozyme polymorphisms and for cork quality in relation
to some environmental parameters. A total number of 24 sample stands of cork oak were selected, representing typical vegetation,
sylvicultural and cork quality features within the eight identified cork growing areas in Sardinia. Considerable variation
was found between cork oak stands of the different areas. Results of the principal component analysis performed on the cork
quality data and environmental characters of the eight areas, showed that the first three components explain 72.2% of the
variation. The major characters involved in this differentiation were cork quality characters such as dimensional recover,
moisture and Mg content of the cork and also elevation of stands m a.s.l. for the first component. The second component appears
to be determined by some climatic parameters (average annual temperature and average of the minimum temperatures of coldest
month) and by the Fe and Zn in the cork. For the third component, major characters involved in differentiation are average
annual rainfall, bark thickness and Ca content in the cork. |
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