休眠诱导的白杨根系钙转运到新梢活性的时间上调

IF 1 Q3 PLANT SCIENCES Plant Root Pub Date : 2012-01-01 DOI:10.3117/PLANTROOT.6.10
J. Furukawa, M. Kanazawa, S. Satoh
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引用次数: 6

摘要

为探讨根系功能的季节性,采用电感耦合等离子体原子发射光谱法分析了大杨叶中8种矿物质的含量。这些浓度作为根系矿物质转运活性的指标。在靠近茎尖的叶片中,休眠开始后Ca浓度急剧增加,Mg和Mn浓度也有类似但轻微的增加。由于植物生长所必需的Na浓度不变,所以Ca浓度的增加主要不是通过蒸腾速率的增加,而是通过木质部负荷的根活性的增强来实现的。2010年8月叶片钙浓度比休眠芽形成前高出约5倍。为了研究休眠诱导过程中钙转运活性的变化,我们在光照和温度控制的条件下水培树苗,随后使用生物图像分析仪分析了根吸收钙的分布。在本脉冲追逐试验中,在休眠早期未观察到钙向茎部转运的增强。这表明,在休眠初期,叶片钙含量的增加是由于在休眠开始前,根吸收的钙被装载到根木质部导管中。这些矿物质转运活动的变化表明,钙分布的变化很可能是由芽休眠引起的。此外,休眠诱导过程还调节了几种根功能。
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Dormancy-induced temporal up-regulation of root activity in calcium translocation to shoot in Populus maximowiczii
To explore seasonality of root functions, we analyzed the concentrations of 8 minerals in leaves of Populus maximowiczii (Japanese native poplar) by inductively coupled plasma atomic emission spectroscopy. These concentrations were used as indices of root mineral translocation activity. In leaves close to the shoot apex, dramatic increases in Ca concentration, and similar but slight increase in Mg and Mn, were observed after the onset of dormancy. Because of the constant concentration of Na, which is not essential for plant growth, the increase of Ca concentration was mainly derived from not by the increase of transpiration rate but by the enhancement of root activity of xylem loading. Leaf Ca concentration in August 2010 was approximately fivefold higher than before dormant bud formation. To investigate the shifts in Ca-translocation activity during dormancy induction, we grew saplings hydroponically under lightand temperaturecontrolled conditions and subsequently analyzed the distribution of Ca absorbed by roots using a Bio-Image Analyzer. In this pulse chase experiment, the enhancement of Ca translocation to the shoot was not observed in early dormancy. This suggested the increase of leaf Ca in early dormancy was caused by the Ca loading into root xylem vessels using the root Ca absorbed before the onset of dormancy. These changes in mineral translocation activities indicate that alterations in Ca distribution are most probably triggered by bud dormancy. Furthermore, several root functions were regulated by the dormancy induction process.
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来源期刊
Plant Root
Plant Root PLANT SCIENCES-
CiteScore
1.50
自引率
0.00%
发文量
2
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.
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