The stimulation of ethylene production from seedling tissue of Phascolus vulgaris, Helianthus annuus and Zea mays by growth regulators was inhibited by actinomycin D and puromycin and to a lesser extent by 2-thiouracil and p-fluorophenylalanine. It is concluded that the mechanism of action of growth regulators on the enhancement of ethylene production is the formation of enzymes involved in eth...

Background: Medicinal plants are widely used in treating and preventing specific diseases known to play an important role health care. Helianthus annuus is one of such whose therapeutic applications no doubt have numerous folkloric background. This study aimed at assessing methanol leaf extract for antiulcer antimicrobial potentials Methods: The activity was evaluated using aspirin, ethanol his...

Research on phototropic (PT) bending in sunflower (Helianthus annuus L. cv. Kondi (Syngenta)) seedling hypocotyls presented herein focused a comparison of diurnal and free-running photoperiods with the aim explaining development rhythmicity. PT magnitudes lag phase duration exhibited strong daily rhythmicity all photoperiods, contrasting uniform response to constant light (CL) conditions. Plant...

Leaf ecophysiological traits related to carbon gain and resource use are expected to be under strong selection in desert annuals. We used comparative and phenotypic selection approaches to investigate the importance of leaf ecophysiological traits for Helianthus anomalus, a diploid annual sunflower species of hybrid origin that is endemic to active desert dunes. Comparisons were made within and...

Iron (Fe) deficiency is increasingly being observed in cropping systems with frequent glyphosate applications. A likely reason for this is that glyphosate interferes with root uptake of Fe by inhibiting ferric reductase in roots required for Fe acquisition by dicot and nongrass species. This study investigated the role of drift rates of glyphosate (0.32, 0.95 or 1.89 mm glyphosate corresponding...