Endogenous auxin regulates the sensitivity of Dendrobium (cv. Miss Teen) flower pedicel abscission to ethylene

Functional Plant Biology : FPB
Karnchana RungruchkanontWouter G van Doorn

Abstract

Dendrobium flower buds and flowers have an abscission zone at the base of the pedicel (flower stalk). Ethylene treatment of cv. Miss Teen inflorescences induced high rates of abscission in flower buds but did not affect abscission once the flowers had opened. It is not known if auxin is a regulator of the abscission of floral buds and open flowers. The hypotheses that auxin is such a regulator and is responsible for the decrease in ethylene sensitivity were tested. Severed inflorescences bearing 4-8 floral buds and 4-6 open flowers were used in all tests. The auxin antagonists 2,3,5-triiodobenzoic acid (TIBA, an inhibitor of auxin transport) or 2-(4-chlorophenoxy)-2-methyl propionic acid (CMPA, an inhibitor of auxin action) were applied to the stigma of open flowers. Both chemicals induced high flower abscission rates, even if the inflorescences were not treated with ethylene. The effects of these auxin antagonists virtually disappeared when the inflorescences were treated with 1-methylcyclopropene (1-MCP), indicating that the abscission induced by the auxin antagonists was due to ethylene. Removal of the open flowers at the distal end of the pedicel hastened the time to abscission of the remaining pedicel, and also resulted in...Continue Reading

References

Jun 11, 2002·Analytical Biochemistry·Gordon E Anthon, Diane M Barrett
Jul 10, 2002·Annals of Botany·Wouter G van Doorn
Sep 12, 2002·Annual Review of Plant Biology·Jeremy A RobertsZinnia H Gonzalez-Carranza
Oct 4, 2003·Plant Physiology·Yutaka OonoHirofumi Uchimiya
Jan 1, 2004·Plant Physiology·Sara E Patterson, Anthony B Bleecker
Mar 8, 2005·Annals of Botany·Andrew W Woodward, Bonnie Bartel
Sep 1, 1972·Plant Physiology·P W Morgan, J I Durham

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