Search results for "DWARF SHRUB"
showing 3 items of 3 documents
UV-screening and springtime recovery of photosynthetic capacity in leaves of Vaccinium vitis-idaea above and below the snow pack
2019
International audience; Evergreen plants in boreal biomes undergo seasonal hardening and dehardening adjusting their photosynthetic capacity and photoprotection; acclimating to seasonal changes in temperature and irradiance. Leaf epidermal ultraviolet (UV)-screening by flavonols responds to solar radiation, perceived in part through increased ultraviolet-B (UV-B) radiation, and is a candidate trait to provide cross-photoprotection. At Hyytiälä Forestry Station, central Finland, we examined whether the accumulation of flavonols was higher in leaves of Vaccinium vitis-idaea L. growing above the snowpack compared with those below the snowpack. We found that leaves exposed to colder temperature…
The Mediterranean dwarf shubs: origin and adaptive radiation
2006
Basing on literature data, a synthesis on the morphologic, anatomic and physiologic adaptations of the Mediterranean dwarf shrubs is outlined. Three different functional types can be recognized: saltbushes, thermo-xerophilous fire-resistant dwarf shrubs and orophilous cushion-shrubs. The thermo-xerophilous fire-resistant dwarf shrubs mainly derive from the Mesogean flora and differentiated after the beginning of the Oligocene, and especially from the Pliocene, in the coastal regions around the Tethys Sea, as the result of a local adaptive radiation triggered by the shifting from subhumid to semiarid climatic conditions at the boundary between the tropical and the temperate zone. For the oth…
A syntaxonomical survey of the Sicilian dwarf shrub vegetation belonging to the class Rumici-Astragaletea siculi
2005
Basing on literature data and unpublished relevés from Sicily, a survey of the syntaxa belonging to the class Rumici-Astragaletea siculi Pignatti & Nimis 1980 em. Mucina 1997 (= Cerastio-Carlinetea nebrodensis Brullo 1984) is presented. The class groups orophilous plant communities dominated by dwarf- shrubs, often with a pulvinate and thorny growth form. The class is represented in Sicily by two orders: Rumici-Astragaletalia siculi Pignatti & Nimis 1980, including the sole alliance Rumici-Astragalion siculi Poli 1965, restricted to Mount Aetna, and Erysimo-Jurinetalia bocconei Brullo 1984, including two alliances: the acidophilous Armerion nebrodensis Brullo 1984 and the basiphilous Cerast…