4.7 Article

Ethylene-regulated hastening of perianth senescence after pollination in Dendrobium flowers is not due to an increase in perianth ethylene production

Journal

POSTHARVEST BIOLOGY AND TECHNOLOGY
Volume 62, Issue 3, Pages 338-341

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.postharvbio.2011.07.011

Keywords

Dendrobium flower; 1-Aminocyclopropane-1-carboxylic acid (ACC); ACC oxidase; ACC synthase; Pollination; Senescence

Funding

  1. Postharvest Technology Innovation Center (PHTIC), Commission on Higher Education, Ministry of Education and Kasetsart University Research and Development Institute (KURDI)

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Flowers of Dendrobium cv. Kenny were hand-pollinated using pollinia from cv. Sakura. This resulted in a large increase in flower ethylene emission and rapid perianth (tepal) senescence. The increase in flower ethylene emission was correlated in time with an increase in ethylene emitted by the column (the fused stigma, style and stamens) plus the ovary. No ethylene emission was observed from perianth parts that were isolated at various periods after pollination. The increased ethylene emission by the column plus ovary was correlated with an increase in ACC synthase and ACC oxidase activity in these flower parts. The perianth parts, in contrast, only showed an increase in ACC oxidase activity, following pollination. The data show that pollination-induced early perianth senescence in Dendrobium is mediated by increased ethylene biosynthesis by the column + ovary, and not due to increased ethylene biosynthesis in the perianth parts. Apparently, ethylene synthesized in the gynoecium diffuses to the perianth parts where it induces senescence. The data are very similar to those found previously in pollinated Phaleanopsis orchids and in emasculated Cymbidium orchids, with the exception that ethylene was emitted from the tepals of these two orchids and not from Dendrobium. (C) 2011 Elsevier BY. All rights reserved.

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