Not only light quality but also mechanical stimuli are involved in height convergence in crowded Chenopodium album stands
Article first published online: 6 JUL 2012
© 2012 The Authors. New Phytologist © 2012 New Phytologist Trust
Volume 195, Issue 4, pages 803–811, September 2012
How to Cite
Nagashima, H. and Hikosaka, K. (2012), Not only light quality but also mechanical stimuli are involved in height convergence in crowded Chenopodium album stands. New Phytologist, 195: 803–811. doi: 10.1111/j.1469-8137.2012.04218.x
- Issue published online: 2 AUG 2012
- Article first published online: 6 JUL 2012
- Received: 12 March 2012, Accepted: 22 May 2012
- biomass partitioning;
- flexing caused by wind;
- height convergence;
- light quality;
- mechanical stimuli;
- red to far-red (R/FR) ratio;
- stem diameter growth;
- stem elongation
- •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 10 cm 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.