自然气候条件下橙子树的气孔振荡
Stomatal oscillations in orange trees under natural climatic conditions.
作者信息
Steppe Kathy, Dzikiti Sebinasi, Lemeur Raoul, Milford James R
机构信息
Faculty of Bioscience Engineering, Laboratory of Plant Ecology, Ghent University, Coupure links 653, B-9000 Ghent, Belgium.
出版信息
Ann Bot. 2006 May;97(5):831-5. doi: 10.1093/aob/mcl031. Epub 2006 Feb 14.
BACKGROUND AND AIMS
Stomatal oscillations have been reported in many plant species, but they are usually induced by sudden step changes in the environment when plants are grown under constant conditions. This study shows that in navel orange trees (Citrus sinensis) pronounced stomatal oscillations occur and persist under natural climatic conditions.
METHODS
Oscillations in stomatal conductance were measured, and related to simultaneous measurements of leaf water potential, and flow rate of sap in the stems of young, potted plants. Cycling was also observed in soil-grown, mature orchard trees, as indicated by sap flow in stem and branches.
KEY RESULTS
Oscillations in stomatal conductance were caused by the rapid propagation and synchronization of changes in xylem water potential throughout the tree, without rapid changes in atmospheric conditions.
CONCLUSIONS
The results show marked stomatal oscillations persisting under natural climatic conditions and underscore the need to discover why this phenomenon is so pronounced in orange trees.
背景与目的
许多植物物种中都有气孔振荡的报道，但通常是在植物在恒定条件下生长时，由环境的突然阶跃变化所诱发。本研究表明，在脐橙树（Citrus sinensis）中，明显的气孔振荡在自然气候条件下会出现并持续存在。
方法
测量了气孔导度的振荡，并将其与同时测量的叶片水势以及盆栽幼树茎干中汁液流速相关联。在土壤种植的成年果园树木中，也观察到了循环现象，这通过茎干和树枝中的液流得以体现。
主要结果
气孔导度的振荡是由整个树体木质部水势变化的快速传播和同步引起的，而大气条件没有快速变化。
结论
结果表明在自然气候条件下存在明显的气孔振荡，并强调了探究为何这种现象在橙子树中如此显著的必要性。
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