A circadian and an ultradian rhythm are both evident in root growth of rice

Iijima, Morio; Matsushita, Naofumi

doi:10.1016/j.jplph.2011.06.005

Cited by 16 publications

(9 citation statements)

References 56 publications

(56 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Approximately one-third of the Arabidopsis transcriptome is under circadian control , and consistent with this, many aspects of plant growth and development are influenced by the circadian clock (Farré, 2012;Song et al, 2013). Hypocotyl and root elongation and leaf growth undergo daily rhythms, and the phases of peak growth rates are shifted but not abolished in constant environment conditions (Nozue et al, 2007;Poiré et al, 2010;Iijima and Matsushita, 2011;Yazdanbakhsh et al, 2011).…”

mentioning

confidence: 74%

The REVEILLE Clock Genes Inhibit Growth of Juvenile and Adult Plants by Control of Cell Size

et al. 2017

View full text Add to dashboard Cite

The circadian clock is a complex regulatory network that enhances plant growth and fitness in a constantly changing environment. In Arabidopsis (), the clock is composed of numerous regulatory feedback loops in which () and its homologs and act in a partially redundant manner to promote clock pace. Here, we report that the remaining members of the clade, and , play only minor roles in the regulation of clock function. However, we find that RVE8 clade proteins have unexpected functions in the modulation of light input to the clock and the control of plant growth at multiple stages of development. In seedlings, these proteins repress hypocotyl elongation in a daylength- and sucrose-dependent manner. Strikingly, adult and mutants are much larger than wild-type plants, with both increased leaf area and biomass. This size phenotype is associated with a faster growth rate and larger cell size and is not simply due to a delay in the transition to flowering. Gene expression and epistasis analysis reveal that the growth phenotypes of mutants are due to the misregulation of () and expression. Our results show that even small changes in gene expression caused by the perturbation of clock gene function can have large effects on the growth of adult plants.

show abstract

mentioning

confidence: 74%

The REVEILLE Clock Genes Inhibit Growth of Juvenile and Adult Plants by Control of Cell Size

et al. 2017

View full text Add to dashboard Cite

show abstract

“…direct measurement, or recording via a linear variable displacement transducer [40]), as it is non-invasive, inexpensive, and unbiased. Recently, time-lapse photography of leaf, root, and stem with high-resolution CCD cameras has led to better understanding of factors influencing dynamic changes in morphology [15], [41], [42], [43]. Plants lack the ability to sense wavelengths above far-red (>800 nm); therefore, infrared lighting can be used to illuminate plants in otherwise complete darkness [5], [15], [42], a necessity for measurements in diurnal conditions.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2014

View full text Add to dashboard Cite

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.

show abstract

“…However, marked diel oscillations of root elongation have been reported in A. thaliana , with a growth maximum 1 h after dawn followed by a steep decrease to reach a minimum at dusk and recuperation during the night [20]. Evidence for diel root growth rhythmicity has also been provided for O. sativa , although this was dissonant with the previous results of the same group [18,21]. A clear explanation for these differences has not yet been provided, but factors such as the developmental stage of the plant or the environmental condition during the experiments may account for the contrasting root growth patterns found in the different studies.…”

Section: Introductionmentioning

confidence: 70%

“…A clear explanation for these differences has not yet been provided, but factors such as the developmental stage of the plant or the environmental condition during the experiments may account for the contrasting root growth patterns found in the different studies. For example, an important difference between the experimental conditions of [20] and those of [9,19] or [18,21] is the exposure of the entire root system, including the growing root tips, to light–dark (LD) cycles. As light is known to inhibit root growth [22], the oscillating patterns of the Arabidopsis root elongation found in [20] may have been a result of root illumination [23].…”

Section: Introductionmentioning

confidence: 99%

Synchronous high-resolution phenotyping of leaf and root growth in Nicotiana tabacum over 24-h periods with GROWMAP-plant

2013

View full text Add to dashboard Cite

BackgroundRoot growth is highly responsive to temporal changes in the environment. On the contrary, diel (24 h) leaf expansion in dicot plants is governed by endogenous control and therefore its temporal pattern does not strictly follow diel changes in the environment. Nevertheless, root and shoot are connected with each other through resource partitioning and changing environments for one organ could affect growth of the other organ, and hence overall plant growth.ResultsWe developed a new technique, GROWMAP-plant, to monitor growth processes synchronously in leaf and root of the same plant with a high resolution over the diel period. This allowed us to quantify treatment effects on the growth rates of the treated and non-treated organ and the possible interaction between them. We subjected the root system of Nicotiana tabacum seedlings to three different conditions: constant darkness at 22°C (control), constant darkness at 10°C (root cooling), and 12 h/12 h light–dark cycles at 22°C (root illumination). In all treatments the shoot was kept under the same 12 h/12 h light–dark cycles at 22°C. Root growth rates were found to be constant when the root-zone environment was kept constant, although the root cooling treatment significantly reduced root growth. Root velocity was decreased after light-on and light-off events of the root illumination treatment, resulting in diel root growth rhythmicity. Despite these changes in root growth, leaf growth was not affected substantially by the root-zone treatments, persistently showing up to three times higher nocturnal growth than diurnal growth.ConclusionGROWMAP-plant allows detailed synchronous growth phenotyping of leaf and root in the same plant. Root growth was very responsive to the root cooling and root illumination, while these treatments altered neither relative growth rate nor diel growth pattern in the seedling leaf. Our results that were obtained simultaneously in growing leaves and roots of the same plants corroborate the high sensitivity of root growth to the environment and the contrasting robustness of diel growth patterns in dicot leaves. Further, they also underpin the importance to carefully control the experimental conditions for root growth analysis to avoid or/and minimize artificial complications.

show abstract

A circadian and an ultradian rhythm are both evident in root growth of rice

Cited by 16 publications

References 56 publications

The REVEILLE Clock Genes Inhibit Growth of Juvenile and Adult Plants by Control of Cell Size

The REVEILLE Clock Genes Inhibit Growth of Juvenile and Adult Plants by Control of Cell Size

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

Synchronous high-resolution phenotyping of leaf and root growth in Nicotiana tabacum over 24-h periods with GROWMAP-plant

Contact Info

Product

Resources

About