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The transition metal Zn is essential for many physiological processes in plants, yet at elevated concentrations this, and the related non-essential metal Cd, can be toxic. Arabidopsis thaliana HMA4, belonging to the Type P1B subfamily of P-type ATPases, has recently been implicated in Zn nutrition, having a role in root to shoot Zn translocation. Using(More)
Ethylene is a plant hormone involved in several physiological processes and regulates the plant development during the whole life. Stressful conditions usually activate ethylene biosynthesis and signaling in plants. The availability of nutrients, shortage or excess, influences plant metabolism and ethylene plays an important role in plant adaptation under(More)
The changes in several antioxidants as well as in the level of C-centered free radicals and thiobarbituric acid reactive substances (TBARS) were studied in seeds of Araucaria bidwillii Hook desiccated to 37%, 28% and 21% moisture content. The lowest-safe moisture content for the seedling establishment was 37%. The embryo, besides double amounts of free(More)
Tropospheric ozone is a growing environmental menace in Italy and in the whole Mediterranean basin. The importance of active biomonitoring of this pollutant with hypersensitive Bel-W3 tobacco plants is stressed, and several examples of field studies carried out in Italy with this technique are presented. Current limitations are discussed, with special(More)
The ingestion toxicity of three Lamiaceae essential oils (EOs) - Hyptis suaveolens, Rosmarinus officinalis and Lavandula angustifolia - incorporated in protein baits was evaluated against Bactrocera oleae, a worldwide pest of olive fruits. In laboratory conditions, all the tested EOs showed dose-dependent toxicity on B. oleae, with mortality rates ranging(More)
The volatiles emitted from young and old leaves of two poplar clones (Populus deltoides x maximowiczii, Eridano, and P. x euramericana, I-214) were sampled after exposure to ozone (80 ppb, 5 h d−1, for 10 consecutive days) by solid phase microextraction and characterized by GC-MS. Only mature leaves of the ozone-sensitive Eridano clone developed necrosis in(More)
Centaurea jacea has been suggested as a potential bioindicator for ozone, but little is known about its intraspecific variation in sensitivity, especially at molecular level. The effects of ozone (200 ppb, 5 h) on sensitive and resistant lines of Centaurea have been investigated at the end of fumigation. Sensitive plants showed characteristic symptoms of(More)
The topography and toxicological relevance of the Ca2+-ryanodine receptor complex are evaluated with ryanodine and two natural analogues (9,21-didehydro and the new 18-hydroxy), 13 ryanoid derivatives (prepared from ryanodine and didehydroryanodine by functionalizing the available pyrrole, olefin, and hydroxyl substituents), and four degradation products.(More)
The Ca2+-ryanodine receptor complex is solubilized in functional form on treating sarcoplasmic reticulum (SR) vesicles from rabbit fast skeletal muscle with 3-[(3-cholamidopropyl)dimethylammonio]-1-propane-sulfonate (CHAPS) (1 mg/mg protein) and 1 M NaCl at pH 7.1 by shaking for 30 min at 5 degrees C. The heavy membrane preparations obtained from(More)
Olive tree (Olea europaea L.) is an important crop in the Mediterranean Basin where drought and salinity are two of the main factors affecting plant productivity. Despite several studies have reported different responses of various olive tree cultivars to salt stress, the mechanisms that convey tolerance and sensitivity remain largely unknown. To(More)