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Daily Changes in Temperature, Not the Circadian Clock, Regulate Growth Rate in Brachypodium distachyon

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [3];  [2];  [3]
  1. University of Massachusetts, Amherst, MA (United States); Univ. of Massachusetts, Amhurst, MA
  2. University of Southern California, Los Angeles, CA (United States)
  3. University of Massachusetts, Amherst, MA (United States)
Plant growth is commonly regulated by external cues such as light, temperature, water availability, and internal cues generated by the circadian clock. Changes in the rate of growth within the course of a day have been observed in the leaves, stems, and roots of numerous species. However, the relative impact of the circadian clock on the growth of grasses has not been thoroughly characterized. We examined the influence of diurnal temperature and light changes, and that of the circadian clock on leaf length growth patterns in Brachypodium distachyon using high-resolution time-lapse imaging. Pronounced changes in growth rate were observed under combined photocyles and thermocycles or with thermocycles alone. A considerably more rapid growth rate was observed at 28°C than 12°C, irrespective of the presence or absence of light. In spite of clear circadian clock regulated gene expression, plants exhibited no change in growth rate under conditions of constant light and temperature, and little or no effect under photocycles alone. Therefore, temperature appears to be the primary cue influencing observed oscillations in growth rate and not the circadian clock or photoreceptor activity. Furthermore, the size of the leaf meristem and final cell length did not change in response to changes in temperature. Therefore, the nearly five-fold difference in growth rate observed across thermocycles can be attributed to proportionate changes in the rate of cell division and expansion. A better understanding of the growth cues in B. distachyon will further our ability to model metabolism and biomass accumulation in grasses.
Research Organization:
University of California, San Diego, CA (United States); University of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0006621
OSTI ID:
1904512
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 6 Vol. 9; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Gene transcription and steviol glycoside accumulation in Stevia rebaudiana under polyethylene glycol‐induced drought stress in greenhouse cultivation journal August 2016
Evolutionary Relationships Among Barley and Arabidopsis Core Circadian Clock and Clock-Associated Genes journal January 2015
Leaf Length Tracker: a novel approach to analyse leaf elongation close to the thermal limit of growth in the field journal January 2016
Cross-species complementation reveals conserved functions for EARLY FLOWERING 3 between monocots and dicots journal May 2017
The Effect of Ambient Temperature on Brachypodium distachyon Development journal August 2019

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