The binding of concanavalin A to various structures via hydrophobic interactions has been studied using a variety of physicochemical assays. It was found that concanavalin A binds to nonpolar compounds such as the plant auxin beta-indoleacetic acid and its structural analogue tryptophan and that this binding is independent of the saccharide-binding activity normally associated with the lectin. ...

In vitro rooting and the acclimatization of micropropagated rootstocks of apple trees is essential for plant development in the field. The aim of this work was to assess the use of rhizobia of Adesmia latifolia to promote rooting and acclimatization in micropropagated Marubakaido apple rootstock. An experiment involving in vitro rooting and acclimatization was performed with four strains of rhi...

HARTMANN, A., M. SINGH, and W. KLINGM~~LLER. 1983. Isolation and characterization of Azospirillurn mutants, excreting high amounts of indoleacetic acid. Can. J . Microbiol. 29: 916-923. Mutants of Azospirillum brasilense Sp Cd, resistant to 5-fluorotryptophan (FT) excreted 3-indoleacetic acid (IAA), i.e., auxin, producing up to 16 pg/rnL which was 30 times greater than the wild-type level. Unde...

Applied ethylene influences the growth of etiolated pea stem sections cut from untreated plants, but has no effect on (14)C-indoleacetic acid uptake, polar transport or destruction. However, the capacity of the polar auxin transport system is markedly reduced in sections cut from plants grown in ethylene, while the velocity of auxin transport is unchanged under these conditions. Inhibition of t...

The enzymatic conversion of tryptophan to ind,oleacetic acid (IAA) has been demonstrated in lower and higher plants. In some plants the pathway muist be limited to that involving ini(olepyrtuvic acid (5 ) while in others an alterniative pathway involving tryptamine also exists (6, Q). Alth,ouigh the enzyme system from the pineapple leaf converting tryptophlan and tryptamine to auixin was obtain...