In plants, growth in length by cell elongation is conditioned by certain substances elaborated in the plant and effective in minute amounts, thus having the nature of hormones. A number of simple tests have been worked out which allow of a qualitative and quantitative determination of the growth-promoting properties of various substances. With the aid of these biological tests the native growth...

Entrohemorrhagic Escherichia coli is a human pathogen that causes hemorrhagic colitis due to its verotoxin. It is an agent with food poisoning importance; a significant number of cases subsequntly develop hemolitic uremic syndrome (HUS) which is probably the most common cause of renal failure in childeren and occasionally resulting in death. Inhibition of bacterial growth in food is the most im...

Methyl jasmonate (MJ) and a mixture of G(1), G(2), and G(3) (G-substances) inhibited stomatal opening in abaxial epidermis of Commelina benghalensis and complete closure occurred at 10(-6) molar MJ, or 10(-3) molar G-substances compared to 10(-5) molar abscisic acid (ABA). Proline, even at 10(-3) molar caused only a partial stomatal closure. Apart from ABA, other endogenous plant growth regulat...

AIMS This study aims at evaluating the ability of Beijerinckia derxii, a free-living nitrogen (N)-fixing bacterium frequently isolated from tropical soils, to release certain plant growth regulators [indoleacetic acid (IAA), ethylene, polyamines] and amino acids into the growth medium. METHODS AND RESULTS The production of those substances was compared using both cultures in which nitrogenase...