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Determination of phytohormones in phloem exudate from tree species by radioimmunoassay

✍ Scribed by Elmar W. Weiler; Hubert Ziegler

Book ID
104752424
Publisher
Springer-Verlag
Year
1981
Tongue
English
Weight
255 KB
Volume
152
Category
Article
ISSN
0032-0935

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✦ Synopsis

A sensitive and specific radioimmunoassay was used to determine quantitatively four of the most important phytohormones in the phloem exudate from 14 different tree species of 8 genera. For cytokinins and indole-3-acetic acid (IAA) we found higher concentrations than those reported previously for other species. The gibberellin values were of the same order of magnitude as in earlier analyses (with different methods) of tree phloem exudates, but lower than the ones reported for Ricinus. Free abscisic acid (ABA) was found in tree phloem exudates in similar concentrations as before in Yucca or palm phloem exudate, but at considerably lower ones than reported for Ricinus and in Lupinus phloem exudate.

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Determination of choline in phloem exuda
Determination of choline in phloem exudates of trees
✍ K. A. Kaiser; H. Ziegler πŸ“‚ Article πŸ“… 1987 πŸ› Springer-Verlag 🌐 English βš– 113 KB

Choline, a necessary compound in an artificial diet for phloem-feeding aphids, was determined quantitatively in the phloem exudates of 16 tree species. The method used was a combination of choline oxidase action and oxygen determination with an oxygen electrode. Choline was found in all species, the