The interactions between plants and pollinators are complex. Flower volatiles as special olfactory cues could influence the foraging choices of pollinators. Here, we conducted bioassays to evaluate role flower on attraction honey bees (native Apis cerana exotic mellifera) pears Pyrus bretschneideri communis). Chemical electrophysiological approaches were used determine antennal responses from p...

Pear psylla (Cacopsylla pyricola Foërster) is the most serious pest of the European pear (Pyrus communis L.) in the production regions of Europe and North America. Nine plant germplasm introductions of pear from Central Europe recently released from plant quarantine were evaluated for nymphal feeding antixenosis, a primary mode of resistance known to be correlated with ovipositional antixenosis...

Objective: Analyze the production of polyhydroxyalkanoates (PHA) by Bacillus subtilis sp., in submerged culture using pear residues as a carbon source.
 Design/methodology/approach: The consisted residue flour concentrations 5 and 15 % for 72 h. Reducing sugars, biomass, pH, protein, pHA extraction quantification were analyzed during submerging cultivation subtilis
 Results: results s...

Uptake of Ca(2+) by suspension-cultured pear (Pyrus communis L. cv Passe Crassane) cells and protoplasts was significantly enhanced by exposure to 38 degrees C compared to 25 degrees C. The increased uptake was specific for Ca(2+) and was not due to cell wall binding. Tissues pretreated at 38 degrees C showed increased uptake even upon return to 25 degrees C. Treatment with carbonylcyanide m-ch...

Polysome profiles were examined from lyophilized peel tissue of ripening pear (Pyrus communis, L. var. Passe-Crassane). Messenger RNA chains bearing up to eight ribosomes (octamers) were resolved and exhibited the highest absorption peak when ribonuclease activity was eliminated during extraction. Neither normal ripening nor the increase of large polyribosomes that normally accompanies ripening...