Temporal dynamics in photosynthetic activity of Spirodela polyrhiza turions during dormancy release and germination

Viktor Oláh, Anna Hepp, I. Mészáros

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Turions (vegetative propagules) of aquatic plants functionally resemble seeds but in fact they are overwintering buds having the ability to photosynthesize. They spend long periods in dormant state in the dim and cold bottom layer of natural waters during winter of temperate regions. In this study photosynthetic acclimation of Spirodela polyrhiza (L.) Schleiden (giant duckweed) turions to contrasting environments was assessed in laboratory experiments by means of chlorophyll fluorescence induction and O2-evolution methods and photosynthetic pigment content. Photosynthetic performance of turions had been monitored for 5 weeks in dark and cold (after-ripening) and then for 48 h under continuous irradiation at room temperature (germination induction). Photosynthetic activity of turions displayed biphasic acclimation during after-ripening. A gradual decrease in O2-evolution, variable fluorescence and relative fluorescence decrease was observed during the first 3 weeks with a parallel increase in chlorophyll fluorescence parameters indicative of excitation energy dissipation. Most interestingly later, while turions were still kept in dark and cold, their photosynthetic activity increased again to the level of newly-formed turions. This temporal pattern suggests that changes in photosynthetic performance might be regulated in close connection with dormancy release of turions. After transferring after-ripened turions to warm and illuminated conditions their photosynthetic acclimation took place rapidly. All parameters reflecting photosynthetic efficiency of germinating turions reached or even exceeded the respective levels of newly formed control turions within 24–48 h.

Original languageEnglish
Pages (from-to)50-58
Number of pages9
JournalEnvironmental and Experimental Botany
Volume136
DOIs
Publication statusPublished - Apr 1 2017

Fingerprint

Spirodela polyrhiza
dormancy
germination
fluorescence
acclimation
after-ripening
ripening
chlorophyll
overwintering
aquatic plant
aquatic plants
energy dissipation
bud
pigment
ambient temperature
irradiation
buds
pigments
seed
winter

Keywords

  • Chlorophyll fluorescence
  • Dormancy and after-ripening
  • O-evolution
  • Photosynthetic pigment content
  • Spirodela polyrhiza
  • Turion

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Agronomy and Crop Science
  • Plant Science

Cite this

Temporal dynamics in photosynthetic activity of Spirodela polyrhiza turions during dormancy release and germination. / Oláh, Viktor; Hepp, Anna; Mészáros, I.

In: Environmental and Experimental Botany, Vol. 136, 01.04.2017, p. 50-58.

Research output: Contribution to journalArticle

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