Not only light quality but also mechanical stimuli are involved in height convergence in crowded Chenopodium album stands

Hisae Nagashima, Kouki Hikosaka

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

In crowded stands, height is often similar among dominant plants, as plants adjust their height to that of their neighbours (height convergence). We investigated which of the factors, light quality, light quantity and mechanical stimuli, is primarily responsible for stem elongation and height convergence in crowded stands. We established stands of potted Chenopodium album plants. In one stand, target plants were surrounded by artificial plants that were painted black to ensure that the light quality was not modified by their neighbours. In a second stand, target plants were surrounded by real plants. In both stands, one-half of the target plants were anchored to stakes to prevent flexing by wind. The target plants were lifted or lowered by 10cm to test whether height convergence was affected by the different treatments. Stem length was affected by being surrounded by artificial plants, anchoring and pot elevation, indicating that light quality, light quantity and mechanical stimuli all influenced stem elongation. Height convergence did not occur in the stand with artificial plants or in anchored plants. We conclude that light quality and mechanical stimuli are important factors for the regulation of stem growth and height convergence in crowded stands.

Original languageEnglish
Pages (from-to)803-811
Number of pages9
JournalNew Phytologist
Volume195
Issue number4
DOIs
Publication statusPublished - 2012 Sept

Keywords

  • Biomass partitioning
  • Flexing caused by wind
  • Height convergence
  • Light quality
  • Mechanical stimuli
  • Red to far-red (R/FR) ratio
  • Stem diameter growth
  • Stem elongation

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