Age-associated circadian period changes in Arabidopsis leaves

Abstract

HighlightThe circadian period of the Arabidopsis thaliana leaf shortens with age. TOC1 may be a critical signalling component linking the endogenous clock to leaf ageing pathways.

A high-throughput delayed fluorescence method reveals underlying differences in the control of circadian rhythms inTriticum aestivumandBrassica napus

“…We tested the effect of both plant and leaf aging on period estimates from Brassica and wheat seedlings. Previous studies in Arabidopsis have reported that the pace of the clock increases as the plant ages and that earlier emerged leaves have a shorter period than those which emerge later within the same individual(28). Our results mirror these findings for young wheat and Brassica plants, however this association was lost for older material (Figure 1A).…”

Estimation of the Circadian Phase by Oscillatory Analysis of the Transcriptome in Plants

“…In lettuce, the period length was estimated as 24.0 h based on analyzing the largest leaf per plant in this study. The period length of gene expression varies depending on the leaf age (Kim et al, 2016). Therefore, the period length estimate may differ when analyzing leaves of different ages or the entire aerial part of the plant.…”

Live and Let Die: The Core Circadian Oscillator Coordinates Plant Life History and Pilots Leaf Senescence

“…First, the circadian rhythm is affected by leaf age. The circadian periods of clock-regulated genes as well as the periods of the core clock genes are shorter in older leaves compared with young leaves and appear to be regulated through the clock oscillator TOC1 (Kim et al, 2016). By the way, disruption of the circadian clock in animal systems can also affect senescence and age-related disorders.…”

“…The central circadian oscillators are entrained by temperature and light, leading to diurnal rhythm of gene expression of a plethora of genes resulting in very diverse outputs. The period of the diurnal rhythm shortens from 24 h in young plants to 22-23 h in old plants (Kim et al, 2016). The central clock modulates carbohydrate and nitrogen metabolism, calcium, iron, and copper homeostasis as well as almost all hormonesignaling pathways.…”