Ethionine and Auxin-Action in Avena Coleoptile

Improved Avena Coleoptile Elongation Test for Auxin'

Sum rv01,1f. A mo(lifie(l )rocedlure is presente(d for the bioassay of aulxin lusilng -Iv'eno coleoptile segments. The modifications introduicedl restult in a substantial improvement of the commonly uised( coleoptile elongatioil tests. The proposed test retains the simplicity of physical reqillremeints and of manipulatioIn characteristic of all elongatioln tests. The maiin featuire of the propo...

Auxin-induced Changes in Avena Coleoptile Cell Wall Composition.

Sugar and uronic acid residues were derived from wall polysaccharides of oat (Avena sativa, var. Victory) coleoptiles by means of 2 N trifluoroacetic acid, 72% sulfuric acid, or enzymic hydrolysis. The products of hydrolysis were reduced and acetylated to form alditol acetates which were analyzed using gas chromatography. Time-course studies of auxin-promoted changes in various wall fractions i...

Osmoregulation in the Avena coleoptile in relation to auxin and growth.

A study has been made of the effects of auxin and growth on the ability of Avena coleoptile sections to osmoregulate, i.e. to take up solutes so as to maintain their osmotic concentration, turgor pressure, and growth rate. The high auxin-induced growth rate of Avena coleoptiles is maintained when cells are provided sucrose, glucose, NaCl, or KCl as a source of absorbable solutes, but not when 2...

The Relation Op Protoplasmic Streaming- in the Avena Coleoptile to Respiration and Auxin Transport

Polar Transport of Auxin and Electrical Polarity in Coleoptile of Avena.

In the introduction to a recent paper by the writer (5), -the phenomenon of the polar transport of auxin in plants was briefly discussed. It was indicated there that the electrical theory of the polar transport of auxin was one of the most widely accepted ones. This theory states that the inherent electrical polarity of plants is the cause of the longitudinal polar transport of the negative ion...