Study of physiological integration of dwarfbamboo by using stable isotope (ィイD115ィエD1N)

本研究表明，在矮秆竹个体内，通过水平根系(根茎)进行分株间的资源运输。本研究首次揭示了矮化竹的克隆整合现象。在实验1中，当分株在开放和遮荫条件下由根茎连接时，遮荫条件下的分株质量没有减少，而遮荫条件下的分株质量在分株脱落时显著减少。这一结果表明，克隆整合增强了分株在资源有限条件下的持久性。在实验2中，利用稳定同位素(15N)观察了分株之间的资源运输。异质资源(如光、养分)条件下的分株比同质条件下的资源运输程度更大。

This study showed that resource transportation was occurred between ramets by using horizontal root system (rhizome) within an individual of dwarf bamboo, Sasa palmata. This is the first study revealed the clonal-integration in dwarf bamboo.In the experiment 1, when ramets were connected by rhizome between open and shaded conditions, the mass of the ramets in shaded conditions were not reduced, while ramets mass was strongly reduced by the shaded conditions when the ramets wee severed. This results suggested the clonal integration enhance the persistence of the ramets in resource-limited conditions.In the experiments 2, resource transportation between ramets was observed by using stable isotope (15N) in Sasa palmata. And the extent of resource transportation was greater when the ramets were under heterogenous resource (e.g. light, nutrient) conditions compared with under homogenous conditions.