Regulatory Effect of Cytokinin on Secondary Xylem Fiber Formation in an In Vivo System | Zendy

Y. Saks | Zendy; Pua Feigenbaum | Zendy; Roni Aloni | Zendy

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Regulatory Effect of Cytokinin on Secondary Xylem Fiber Formation in an In Vivo System

Author(s) -

Y. Saks,

Pua Feigenbaum,

Roni Aloni

Publication year - 1984

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.76.3.638

Subject(s) - xylem , cytokinin , kinetin , hypocotyl , botany , fiber , transpiration , chemistry , plantaginaceae , helianthus annuus , biology , horticulture , sunflower , in vitro , biochemistry , photosynthesis , tissue culture , organic chemistry , auxin , gene

The regulatory effect of cytokinin on the formation of secondary xylem fibers was studied in the hypocotyl of young Helianthus annuus L. plants. Positive correlation was found between the kinetin supplied (0.25-0.5 micrograms/gram) to the growth medium and the rate of fiber formation within and between the vascular bundles. Reducing the root originated cytokinin supply, either by root removal or by lowering the transpiration rate, diminished the number of newly formed secondary xylem fibers. This decrease was considerably reversed in the presence of 0.5 microgram/gram kinetin. Early pulse exposure of kinetin had a temporary promoting effect on fiber differentiation at low concentrations and a permanent inhibitory effect at high concentration.

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