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  • Author or Editor: Duane A. Heng x
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Abstract

Levels of root-promoting substances from Pelargonium hortorum Bailey were detected by the mung bean rooting bioassay. Fractionated ethanolic extracts from Pelargonium showed 1 major and 2 minor zones which promoted rooting of mung beans. The active fractions promoted rooting in the absence of indoleacetic acid (IAA), in contrast to results previously published. Levels of promoters fluctuated during the propagation period, decreasing to a low point just prior to root initiation. Active zones from extracts of Pelargonium treated with 2500 ppm succinic acid-2, 2-dimethylhydrazide (daminozide, SADH) did not differ from those of controls indicating that daminozide does not promote rooting by modification of the level of ethanolic extractable root promoters.

Open Access

Abstract

Encapsulated 2-chloroethyl-trimethylammonium chloride (chlormequat) stimulated and retarded growth of tomatoes, petunias, snapdragons, and mar-igolds. Low rates (3-6 g of 1, 2 oi 4% active ingredients/liter of growing medium) stimulated earlier bloom up to 14 days in these crops and doubled stem diameter in tomato. Conversely, higher levels of encapsulated chlormequat (12-25 g/liter) retarded plant height to 50% of controls and produced stocky more symmetrical bedding plants without deleterious effects.

Open Access