Temporal responses of Arabidopsis root architecture to phosphate starvation:: evidence for the involvement of auxin signalling
Temporal responses of Arabidopsis root architecture to phosphate starvation:: evidence for the involvement of auxin signalling
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DOI：
10.1046/j.1365-3040.2003.01030.x
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发表时间：
2003-07-01
影响因子：
7.3
通讯作者：
Doumas, P
中科院分区：
文献类型：
--
作者：
Al-Ghazi, Y;Muller, B;Doumas, P
根系结构对养分有效性作出反应的能力是植物适应环境条件的关键适应行为。在单个时间点比较的基础上，先前表明对磷缺乏的反应涉及拟南芥的初生根和侧根。在这项工作中，研究了拟南芥根对磷饥饿的响应的时间模式。对根的每日扫描表明，构型的变化很大程度上是由于基于时间的生长参数的变化，即初级根的伸长率下降，而侧根的伸长率增加，启动的侧根的数量减少。此外，另一个已确定的反应是表现出早期生长停滞的侧根比例的下降。此外，根形态与生长素抗性突变体axr4的比较、磷饥饿植株的生长素处理和有限转录组分析支持生长素信号转导参与了根系构型对磷胁迫的适应性反应的结论。
The ability of the root system architecture to respond to nutrient availability is a key adaptative behaviour allowing plants to cope with environmental conditions. On the basis of single time point comparisons, the response to phosphate deprivation was previously shown to involve both the primary and lateral roots of Arabidopsis. In this work, the temporal pattern of Arabidopsis root responses to phosphate starvation was investigated. Daily scanning of roots showed that changes in architecture were largely due to the alterations of time-based growth parameters, namely a decrease in the elongation rate of the primary root opposed to an increase in the elongation rate of lateral roots and a decrease in the number of initiated lateral roots. In addition, another identified response was a decrease in the proportion of lateral roots showing early growth arrest. All these changes occurred within a short period of approximately 3 d. In addition, the root morphology comparison with the auxin-resistant mutant axr4, the auxin-treatment of phosphate-starved plants and a limited transcriptome analysis supported the conclusion that auxin signalling was involved in the adaptive response of the root system architecture to phosphate deprivation.