Translator Disclaimer
23 December 2016 Effects of red/far-red light ratio on common lamb’s-quarters, redroot pigweed, and tomato plants
L. Ma, M.K. Upadhyaya
Author Affiliations +

Red/far-red (R/FR) ratio, a signal of impending competition from neighbouring plants, fluctuates in plant canopies because of selective absorption of red light and transmission and reflection of far-red light by leaves. The differential response of a crop and associated weeds to changes in R/FR ratio could therefore influence competitive interaction among them. In a growth chamber study, growth, morphological, and allometric responses of common lamb’s-quarters (Chenopodium album L.), redroot pigweed (Amaranthus retroflexus L.), and tomato (Solanum lycopersicum L.) seedlings to changes in R/FR ratio were investigated. Low R/FR ratio increased plant height, stem length below the first node, stem diameter, leaf length, and stem/shoot weight ratio, and decreased leaf greenness, leaf/shoot weight, and leaf/stem weight ratios in some or all of these species; the species differed significantly in this regard. Total length and surface area of tomato root were greater under low R/FR ratio. R/FR ratio did not affect root parameters of lamb’s-quarters and pigweed. The observed differential response to R/FR treatment suggests that fluctuations in R/FR ratio in a canopy of mixed populations could impact interactions among these species.

Copyright remains with the author(s) or their institution(s). Permission for reuse (free in most cases) can be obtained from RightsLink.
L. Ma and M.K. Upadhyaya "Effects of red/far-red light ratio on common lamb’s-quarters, redroot pigweed, and tomato plants," Canadian Journal of Plant Science 97(3), 494-500, (23 December 2016).
Received: 11 March 2016; Accepted: 1 December 2016; Published: 23 December 2016

This article is only available to subscribers.
It is not available for individual sale.

amarante réfléchie
chénopode blanc
common lamb’s-quarters
rapport rouge/rouge lointain
red/far-red light ratio
redroot pigweed
Get copyright permission
Back to Top