Planta

, Volume 191, Issue 2, pp 238–245 | Cite as

Enhancement of red-light-induced anthocyanin synthesis in sorghum first internodes by moderate low temperature given in the pre-irradiation culture period

  • Chizuko Shichijo
  • Tohru Hamada
  • Masanori Hiraoka
  • Christopher B. Johnson
  • Tohru Hashimoto
Article

Abstract

Anthocyanin synthesis in the broom sorghum, Sorghum bicolor Moench cvs. Acme Broomcorn and Sekishokuzairai-Fukuyama, is mediated separately or synergistically by an ultraviolet light-B (UV-B) photoreceptor and phytochrome. When seedlings were exposed to moderate low temperatures ranging from 12 to 20° C before irradiation, only the phytochrome-mediated anthocyanin synthesis was markedly enhanced compared with the control, which was kept throughout at 24° C; synthesis mediated by the UV-B photoreceptor was unaffected. The effectiveness of an exposure to 20° C increased as the duration of exposure increased up to 24 h and as the time of exposure became closer to the time of irradiation. However, when seedlings were exposed to 20° C from after irradiation until harvest, anthocyanin syntheses induced by both UV-B and red light were equally suppressed, probably due to the general reduction of metabolism involved in anthocyanin synthesis that is a consequence of lower temperature. The results support the view that the signal transduction of the pyhtochrome system is different from that of the UV-B photoreceptor, and indicate that the phytochrome system may involve a step or steps which are amplified by a previous exposure to the moderate low temperature.

Key words

Anthocyanin synthesis Low temperature Phytochrome Red light Sorghum (anthocyanin, phytochrome) Ultraviolet light-B 

Abbreviations

FR

far-red light

LT

low temperature

MLT

moderate low temperature

Pfr

far-red-light-absorbing form of phytochrome

R

red light

UV

ultraviolet light

UV-B

ultraviolet light-B

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • Chizuko Shichijo
    • 1
  • Tohru Hamada
    • 1
  • Masanori Hiraoka
    • 1
  • Christopher B. Johnson
    • 1
  • Tohru Hashimoto
    • 1
  1. 1.Department of Biology, Faculty of ScienceKobe UniversityKobeJapan

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