No abstract

Hexamethylphosphoramide and hexamethylmelamine are effective as male house fly chemosterilants. Both compounds are structurally similar to the two highly active sterilants tepa and tretamine, but they differ from the aziridinyl compounds in their low toxicity for mammals and in their lack of alkylating properties. This discovery of nonalkylating male sterilants of low toxicity should substantially increase the scope and practicality of the sterilemale control method.

t ‐Butyl azidoformate product: t ‐Butyl azidoformate

No abstract

1988. Genotypic variation in coleus in the ability to accumulate abscisic acid in response to water deficit. -Physiol. Plant. 72: 441-449.Abscisic acid (ABA) concentration and plant and soil water potentials were determined in leaves of three cultivars of Coleus blumei Benth. cvs. Marty, Buckley Supreme and PI3.54190, chosen for their differences in sensitivity to drought, SO, andor chilling stress. Plants were subjected to 'gradual' soil moisture stress (SMS) for 0-6 days, during which time the soil dried out slowly and to more 'rapid' SMS for CLY days where the soil dried out at a faster rate. Plants were propagated from clonal stock in the greenhouse and transferred to the growth chamber, where they were maintained for 1 week prior to beginning water stress treatment. ABA concentration was determined as the methyl ester using a gas chromatographyelectron capture detector method. Samples for ABA determinations were taken from the third pair of leaves from the apex at the same time each day (1430 h). Measurements of stomatal conductance (C,) and leaf water potential (I$,) were made on the fourth pair of leaves from the apex, using the same plants as those sampled for ABA. During the more rapid stress portion of the study soil matric potentials (I$),) were monitored on a daily basis. Despite large cultivar differences in ABA concentration at 0-6 days, by 7-9 days these differences had largely disappeared. Except for drought-insensitive cv. Marty, there was generally little correlation between ABA levels and measurements of plant and soil water status at 7-9 days.