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Abstract
A single application of 10 μg of brassins to a young internode of a ‘Pinto’ bean plant accelerated growth of the treated internode and of other internodes above and below the treated area. The treated internodes grew longer overall and thicker in some areas than comparable untreated ones. These responses involve both cell elongation and cell division. The treatment also caused marked changes in the vascular anatomy of leaves above the site of application.
Abstract
Red tart cherries treated with succinic acid 2,2-dimethyl hydrazide (Alar) 5 were studied for changes in anthocyanin pigments and also histochemical changes. Anthocyanin biosynthesis was altered as a result of the treatment. The significant effect of Alar was to change markedly most of the individual pigment ratios. Of note is the fact that the concentration of the pigment peonidin 3-rutinoside was unaltered. The treated fruit showed an increase in total anthocyanin pigment.
Alar treatment also caused both quantitative and qualitative changes in cell wall carbohydrate composition. Treated fruit had more total wall material and showed callose formation. Furthermore, the sprayed fruit contained more pectin and hemicellulose. The amount of cellulose and lignin was not affected. The relation between changes in cell wall polysaccharides and increased firmness of sour cherries as a result of the treatment is discussed.
Abstract
A single application of brassins isolated from rape (Brassica napus L.) pollen and placed on a 1 – 3.5 mm internode of young paper birch (Betula papyrifera Marsh.), Siberian elm (Ulmus pumila L.), and tea crabapple (Malm hupehensis (Pamp.) Rehd.) seedlings greatly accelerated elongation of the treated internodes.