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Adventitious rooting in hypocotyls of sunflower (Helianthus annuus) seedlings
Author(s) -
Fabijan Dorothy,
Taylor John S.,
Reid David M.
Publication year - 1981
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.1399-3054.1981.tb02755.x
Subject(s) - hypocotyl , primordium , helianthus annuus , sunflower , auxin , gibberellic acid , gibberellin , endogeny , biology , botany , cytokinin , horticulture , chemistry , germination , biochemistry , gene
The effect of brief application (usually for 3 h) of various growth regulators and their antagonists on the production of adventitious root primordia in sunflower hypocotyls over a 3 day period, was investigated. Gibberellic acid inhibited, while an inhibitor of gibberellin biosynthesis promoted rooting. Low concentrations of cytokinins increased, but higher levels inhibited primordia formation. Auxin was able to stimulate or inhibit root production, depending upon the quantity applied, and triiodobenzoic acid applied to the top of the hypocotyls lowered the rate of root formation. From experiments in which benzyladenine, silver nitrate and benzyl isothiocyanate were supplied to the hypocotyl for various 3 h periods after root removal, we concluded that some of the important events necessary for adventitious root production occur during the first few hours after excision of the original root system. We also suggest that the hypocotyl cells on the first day go through a phase during which primordia production is blocked by endogenous ethylene and on the second day enter a phase during which endogenous ethylene promotes rooting.