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Formation of Cytokinin Nucleotides in a Detached Inflorescence Stalk and the Occurrence of Nucleotides in Phloem Exudates from Attached Yucca Plants
Author(s) -
VONK C. R.
Publication year - 1978
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1978.tb08612.x
Subject(s) - exudate , zeatin , phloem , nucleotide , mevalonic acid , cytokinin , isopentenyl pyrophosphate , biochemistry , biology , chemistry , pyrophosphate , auxin , botany , biosynthesis , enzyme , gene
The metabolism of isopentenyl adenine, Δ‐isopentenyl pyrophosphate, DL‐mevalonic acid and adenine in detached inflorescence stalks of Yucca has been studied using radioactive tracer techniques. Xylem feeding of detached stalks with Δ‐isopentenyl pyrophosphate, DL‐mevalonic acid or adenine did not result in the formation of zeatin‐ or isopentenyl adenine cytokinins. In contrast isopentenyl adenine fed to a detached inflorescence stalk lead to the formation of isopentenyl‐ and zeatin nucleotides in the exudate. After alkaline phosphatase treatment of this exudate an unknown compound, presumably isopentenyl adenine‐7‐glucoside was also detected. The same compound was found after incubation of phloem exudate with isopentenyl adenine. The occurrence of both zeatin‐ and isopentenyl adenine nucleotides in phloem exudate from an attached inflorescence stalk of Yucca is described.