Molecular and physiological studies in walnut (Juglans regia) are combined to establish the putative role of leaf plasma membrane aquaporins in the response of leaf hydraulic conductance (K(leaf)) to irradiance. The effects of light and temperature on K(leaf) are described. Under dark conditions, K(leaf) was low, but increased by 400% upon exposure to light. In contrast to dark conditions, K(le...

Bud break pattern is a key determinant of tree architecture. The mechanisms leading to the precedence of certain buds over the others are not yet fully explained, but the availability of soluble sugars may play a significant role, especially those in the xylem sap at the onset of the growing period. Here, we measured carbon availability in the different tissues (bud, xylem and bark). To assess ...

Photosynthetic light acclimation of leaves can result from (i) changes in mass-based leaf nitrogen concentration, Nm, (ii) changes in leaf mass:area ratio, Ma, and (iii) partitioning of total leaf nitrogen among different pools of the photosynthetic machinery. We studied variations in Nm and Ma within the crowns of two peach (Prunus persica L. Batsch) trees grown in an orchard in Portugal, and ...

Ellagic acid (EA) is a naturally occurring polyphenol found in a variety of plants in its free form or in the form of ellagitannin glycosides. In this study, the ellagic acid content of the methanol extracts of Juglans regia L. (Juglandaceae) leaves, Castanea sativa Mill. (Fagaceae) stem bark, and Eucalyptus camaldulensis Dehnh. (Myrtaceae) leaves was determined to develop melanogenesis inhibit...

The aim of this study was to identify phenolic compounds in walnut leaves from northern Iraq and evaluate their ability act as antibacterial antioxidant agents. Phenolic were determined by reversed-phase HPLC. Antibacterial activity tested against various bacteria. Antioxidant properties evaluated assays, including reducing power DPPH radical scavenging activity. HPLC profiles leaf fractions re...

background methicillin-resistant staphylococcus aureus (mrsa) is considered a major cause of nosocomial and community infections. its prevalence varies from country to country, even between hospitals of a country. these bacteria often have multi-resistance and can be difficult to treat. objectives the current study evaluated the effect of hydroalcoholic extract of the stem bark of juglans regia...