golestan province is one of the main tobacco growing regions in the country. tobacco streak virus (tsv) is a destructive pathogen on tobacco that has a wide host range and occurs worldwide. in order to serological detection of tsv at 13 region of golestan province, 500 infected samples belong to 8 families; chenopodiacae, amaranthaceae, fabaceae, solanaceae, malvaceae, poaceae, cucurbitaceae an...

Nonphotosynthetic cells of higher plants depend on the supply of a carbon substrate, usually sucrose, for cellular metabolism. Typically this sucrose is synthesized in leaves from the products of photosynthesis. Because of the lack of light below ground, roots do not generally photosynthesize (we note the exception of certain mangrove species and members of the Orchidaceae), although many roots...

Nonphotosynthetic cells of higher plants depend on the supply of a carbon substrate, usually sucrose, for cellular metabolism. Typically this sucrose is synthesized in leaves from the products of photosynthesis. Because of the lack of light below ground, roots do not generally photosynthesize (we note the exception of certain mangrove species and members of the Orchidaceae), although many roots...

Hymenoclea salsola, Asteraceae, Resin Flavonoids, 2',4',6 'OH Chalcone Hymenoclea salsola (Asteraceae), a dominant shrub of the desert areas of California and Baja California, Mexico, secretes high amounts of resin on the leaf surface. Chemi­ cal analysis of the resin revealed the presence of a complex mixture of flavonoid aglycones. Among the compounds identified is the rare 2',4',6'-OH chalco...

Studies on the antibacterial activities of the leaf extract of Citrullus colocynthis (Cucurbitaceae), a medicinal plant used for the treatment of various ailments was carried out using agar disc diffusion technique. The results revealed that the crude acetone extract exhibited antibacterial activities against Pseudomonas aeruginosa with zones of inhibition measuring 14.0mm. The chloroform leaf ...

Analytical HPTLC analysis of ethanolic extracts of leaf and fruits of Momordica tuberosa and Momordica dioica (Cucurbitaceae) showed the presence of charantin with Rf value 0.31at 536nm. Maximum amount of Charantin was found in the leaves of M. dioica than the fruits. Comparatively less amount of charantin was detected in the leaves and fruits of M. tuberosa Apart from charantin other saponins ...

BACKGROUND AND AIMS Lobed leaves are considered selectively advantageous in conditions of high irradiance. However, most studies have involved woody species, with only a few considering the role of leaf lobation in herbaceous rosette species. In this study, it is hypothesized that, in addition to its adaptive value in high light, leaf lobation may add to the function of petioles as vertical spa...