【摘要】 机械刺激(mechanical stimuli, MS)在自然界的分布较为普遍,然而关于机械刺激对匍匐茎型克隆植物影响的研究相对较少。为此,实验对匍匐茎型克隆植物蛇莓(Duchesneaindica)进行了对照(无机械刺激)、克隆片段顶部刺激、半克隆片段刺激和整克隆片段刺激共四个水平的机械刺激处理,通过研究蛇莓克隆生长的响应,探讨机械刺激对其作用机理。结果表明:与对照相比,机械刺激导致蛇莓产生较多的分株、较多的匍匐茎、短而细的叶柄及较多的根生物量分配。同时,不同作用位点的机械刺激对各生理生长指标的效应差异并不显著。另外,通过对各生长指标表型可塑性指数的分析发现,分株数具有较高的可塑性指数。上述实验结果表明,蛇莓可以较好地适应机械刺激干扰的生境,其分株数可以作为其响应程度的较好的指示指标。更多还原

【Abstract】 Mechanical stimuli(MS) are ubiquitous, nevertheless, only few studies have been conducted on the effects of MS with stoloniferous plants. Aiming to solve this question, stoloniferous plants of Duchesnea indica were subjected to four levels of MS treatments as control(CK; no-MS), MS on apical part of the clonal fragments(AMS), MS on half part of the clonal fragments(HMS) and MS on the whole clonal fragments(WMS) in a greenhouse experiment. The results showed that compared to the control,MS induced more ramets, more stolons, shorter and thinner petiole, and more biomass allocation to roots in the examined plants.There were no major differences in the traits of MS-stimulated plants with variable positions of the mechanical loading along the stolons. Furthermore, the phenotypic plasticity values of the traits in response to MS differed significantly from each other, and the number of ramets had the highest plasticity among the traits. The results suggested that the stoloniferous plant D. indica can adapt to mechanically disturbed environments, and the number of the ramets can be a good indicator of the responses.更多还原