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Differential regulation of anthocyanin pigmentation by temperature in Cymbidium orchid flowers

Research Project

Project/Area Number 09660025
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 園芸・造園学
Research InstitutionShizuoka University

Principal Investigator

OHNO Hajime  Shizuoka University, Faculty of Agriculture, Associate Professor, 農学部, 助教授 (20126840)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsCymbidium / Pigmentation / Anthocyanin / Labellum / High Temperature / 温度
Research Abstract

As in other plants, anthocyanin accumulation in the petals and sepals of Cymbidium flowers is also stimulated by low temperature. On the other hand, that in the labellum is promoted not by low temperature but by high temperature. This interesting differential regulatory mechanism of anthocyanin pigmentation by temperature was investigated with three Cymbidium hybrids (Ruby Eyes 'Golden Star', Sazanami 'Haru-no-umi', Valley Flower 'Three Lip M_rchen'.
Pigmentation pattern of the labellum at anthesis varied with developmental stages of flower buds at the onset of high temperature treatment (31゚C light/23゚C dark temperatures, 16 h photoperiod). In younger flower buds, labellum pigmentation was strongly stimulated by high temperature. Anthocyanin accumulation in the labellum was induced irreversively even by high temperatue for only 3 days. The influence of high temperature decreased with flower bud development. High temperature had little or no effect on the anthocyanin accumulation in the labellum of well-developed flower buds. Also in the two labellum-like petals of Valley Flower 'Three Lip M_rchen' flowers, anthocyanin pigmentation was promoted by high temperature as in the true labellum. The high temperature-induced stimulation of anthocyanin pigmentation in the labellum of Cymbidium hybrids seems to be a different phenomenon from pollination- and/or emasculation-induced labellum coloration.
The step(s) of the anthocyanin biosynthetic pathway which is differentially regulated between the labellum and the other perianths by temperature remains to be determined.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report

URL: 

Published: 1997-04-01   Modified: 2016-04-21  

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