Stable diurnal growth rhythms modulate root elongation of Arabidopsis thaliana

IF 1 Q3 PLANT SCIENCES

Plant Root Pub Date : 2011-01-01 DOI:10.3117/PLANTROOT.5.17

N. Yazdanbakhsh, J. Fisahn

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引用次数: 17

Abstract

Arabidopsis root growth kinetics were investigated with high temporal and spatial resolution in combination with detailed statistical analysis to resolve presence of diurnal modulation of root tip displacement. In particular, high resolution video imaging was used to monitor root-tip displacement of Arabidopsis thaliana seedlings over several days. Root growth kinetics were sampled and statistically analyzed in two different photoperiods: long day LD (16 h-8 h) and equal LD (12 h-12 h) light. Diurnal root elongation kinetics exhibited five highly reproducible phases, one of these being a maximum of root growth rate displayed 1-2 h after the light on phase. Then, during the later part of the light period, root growth rate decreased. Several hours before darkening root elongation rates started to increase, with a profound decrease immediately after darkness. Subsequent to this dark-induced reduction in root growth rate the remaining part of the night was characterized by increasing growth activity. Together, tip elongation, in Arabidopsis roots is modulated by strong diurnal rhythms that are maintained in both photoperiods used and also in continuous illumination.

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稳定的生长节律调节拟南芥根系伸长

利用高时空分辨率结合详细的统计分析，对拟南芥根系生长动力学进行了研究，以解决根尖位移的日调节问题。利用高分辨率视频成像技术对拟南芥幼苗的根尖位移进行了数天的监测。在长日照(16 h-8 h)和等日照(12 h-12 h)两个不同的光周期下取样并统计分析根系生长动力学。根系伸长动力学表现为5个高度可重复的阶段，其中一个阶段是在光照期后1 ~ 2 h根系生长速率达到最大值。光照后期，根系生长速率下降。在变暗前几个小时，根系伸长率开始增加，天黑后立即大幅下降。在黑暗诱导的根系生长速率降低之后，夜间剩余部分的特征是生长活性增加。总之，拟南芥根系的尖端伸长是由强烈的昼夜节律调节的，这种节律在使用的光周期和连续照明下都保持不变。

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来源期刊

Plant Root PLANT SCIENCES-

CiteScore

1.50

自引率

0.00%

发文量

期刊介绍： Plant Root publishes original papers, either theoretical or experimental, that provide novel insights into plant roots. The Journal’s subjects include, but are not restricted to, anatomy and morphology, cellular and molecular biology, biochemistry, physiology, interactions with soil, mineral nutrients, water, symbionts and pathogens, food culture, together with ecological, genetic and methodological aspects related to plant roots and rhizosphere. Work at any scale, from the molecular to the community level, is welcomed.