Developmental responses of portulaca seedlings to conflicting spectral signals

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Portulaca oleracea seedlings avoid growing in the direction of neighbouring plants even when they are very small or remote. The present study was designed to determine the relative effect on the development of Portulaca seedlings of light availability (i.e. the resource level) as compared with spectral composition (i.e. the signal of future competition for the resource). The plants were subjected to various intensities of photosynthetic light and red/far-red (R/FR) ratios from opposite directions. The seedlings became recumbent preferentially towards the direction with the lower FR light, even when this meant growing towards plastic that absorbed 20 times more photosynthetic light. A preference for the direction with higher photosynthetic light over lower FR was also found, though only under extreme light differences. The response of the seedlings was not absolute: the orientation chosen depended on the light received from other alternative directions.

Original languageEnglish
Pages (from-to)138-140
Number of pages3
Issue number1
StatePublished - 1 Sep 1991
Externally publishedYes


  • Developmental plasticity
  • Environmental signals
  • Plant competition
  • Portulaca oleracea L.
  • Red/far-red ratios

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics


Dive into the research topics of 'Developmental responses of portulaca seedlings to conflicting spectral signals'. Together they form a unique fingerprint.

Cite this