c2.2.7 – Differenziazione fisiologica di ecotipi mediterranei ed orientali di Castanea sativa Mill.

Lauteri M, Monteverdi MC, Scartazza A, Augusti A, Brugnoli E

Istituto per l’Agroselvicoltura, CNR, Porano (TR), Italy
Collocazione: c2.2.7 – Tipo Comunicazione: Presentazione orale
2° Congresso SISEF *
Sessione 2: “Biodiversità nei sistemi forestali: dalle indagini di base alle prospettive applicative” *

Abstract: The natural variability of European chestnut was studied during the past decade concerning both population genetic and stress physiology. Joint genetic-physiological studies recently addressed this variability to the adaptivness of chestnut to environments with substantial thermo-pluviometric differences. Particularly, wide variability was found among populations spread along a Turkish transect from the Black Sea coast to the Mediterranean coast. Along this transect climate gradually changes from sub-humid to sub-arid. Eastern populations were compared to Mediterranean ones in a common site in Italy to study the physiological basis of a differential adaptivness to different climates. This plant collection was analysed for carbon isotope discrimination (D , a parameter related to plant water-use efficiency), photosynthesis, above ground biometry and phenology. The Mediterranean drought adapted chestnut populations showed higher delta (lower water-use efficiency), higher photosynthesis, higher mesophyll conductance, lower juvenile growth, higher long term growth and higher earliness of bud burst with respect to the Eastern chestnut populations. Furthermore, recent researches pointed out variability of both plant hydraulic conductance and stomatal sensitivity to transpirative demand, comparing contrasting populations. Finally, biodiversity in the expression of adaptive traits is discussed as a whole to underline different adaptive strategies which identify two forms of European chestnut: namely the Mediterranean ecotype and the eastern one.

Citazione: Lauteri M, Monteverdi MC, Scartazza A, Augusti A, Brugnoli E (1999). Differenziazione fisiologica di ecotipi mediterranei ed orientali di Castanea sativa Mill. . 2° Congresso Nazionale SISEF, Bologna, 20 – 22 Ott 1999, Contributo no. #c2.2.7