New Plant Growth Retardants

Influence of Plant Growth Retardants on Quality of Codonopsis Radix.

Plant growth retardant (PGR) refers to organics that can inhibit the cell division of plant stem tip sub-apical meristem cells or primordial meristem cell. They are widely used in the cultivation of rhizomatous functional plants; such as Codonopsis Radix, that is a famous Chinese traditional herb. However, it is still unclear whether PGR affects the medicinal quality of C. Radix. In the present...

New Thinking on Flame Retardants

Plant growth retardants as inhibitors of sterol biosynthesis in tobacco seedlings.

Three plant-growth retardants 2'-isopropy1-4'-(trimethylammonium chloride)-5-methylphenylpiperidine carboxylate (Amo 1618), beta-chloroethyltrimethylammonium chloride, and tributyl-2, 4-dichlorobenzylphosphonium chloride were tested for their effects on sterol production in, and growth of tobacco (Nicotiana tabacum) seedlings. As the concentration of each retardant increased, there was an incre...

Inhibition by plant growth retardants of cholesterol biosynthesis in slices of rat liver and hepatoma.

The plant growth retardant Phosfon inhibits cholesterol formation by cell·free preparations of normal liver and the Morris hepatomas 5123C, 7794A, and 9618A. In addition, both Phosfon and Amo 1618 arc active in inhibiting cholesterol synthesis from acetate and mevalonate in slices of host liver and the hepatomas. Fatty acid synthesis from acetate was also reduced in the presence of the retardants.

An enzymic site of inhibition of gibberellin biosynthesis by Amo 1618 and other plant growth retardants.

\Wirwille and M1itchell reported that apl)lications of 2'-isoprol)vl-4'(trimethv lammllonium chloride) -5'methylphenvl piperidine-1-carboxvlate (Amo 1618) (fig 1, I) to several types of flowNering plants led to ani abnormial growth habit characterized by shorter stemiis and initernodes (17). Amo 1618 is one of the mllost active of several carbamate esters containiing a q uarternarv ami-moniiumi...