BACKGROUND AND AIMS:In clonal plants, internode connections allow translocation of photosynthates, water, nutrients and other substances among ramets. Clonal plants form large systems that are likely to experience small-scale spatial heterogeneity. Physiological and morphological responses of Fragaria vesca to small-scale heterogeneity in soil quality were investigated, together with how such heterogeneity influences the placement of ramets. As a result of their own activities plants may modify the suitability of their habitats over time. However, most experiments on habitat selection by clonal plants have not generally considered time as an important variable. In the present study, how the foraging behaviour of clonal plants may change over time was also investigated. METHODS:In a complex of environments with different heterogeneity, plant performance was determined in terms of biomass, ramet production and photosynthetic activity. To identify habitat selection, the number of ramets produced and patch where they rooted were monitored. KEY RESULTS:Parent ramets in heterogeneous environments showed significantly higher maximum and effective quantum yields of photosystem II than parents in homogeneous environments. Parents in heterogeneous environments also showed significantly higher investment in photosynthetic biomass and stolon/total biomass, produced longer stolons, and had higher mean leaf size than parents in homogeneous environments. Total biomass and number of offspring ramets were similar in both environments. However, plants in homogeneous environments showed random allocation of offspring ramets to surrounding patches, whereas plants in heterogeneous environments showed preferential allocation of offspring to higher-quality patches. CONCLUSIONS:The results suggest that F. vesca employs physiological and morphological strategies to enable efficient resource foraging in heterogeneous environments and demonstrate the benefits of physiological integration in terms of photosynthetic efficiency. The findings indicate that short-term responses cannot be directly extrapolated to the longer term principally because preferential colonization of high-quality patches means that these patches eventually show reduced quality. This highlights the importance of considering the time factor in experiments examining responses of clonal plants to heterogeneity.

译文

背景与目的:在无性植物中,节间连接允许光合产物,水,养分和其他物质在分株间移位。克隆植物形成了可能经历小规模空间异质性的大型系统。研究了草莓(Fragaria vesca)对土壤质量中小尺度异质性的生理和形态响应,以及这种异质性如何影响分株的放置。由于其自身的活动,植物可能会随着时间的流逝而改变其栖息地的适宜性。但是,大多数关于克隆植物选择生境的实验通常没有将时间视为重要变量。在本研究中,还研究了克隆植物的觅食行为如何随时间变化。
方法:在具有不同异质性的复杂环境中,根据生物量,分株产量和光合活性确定植物的生长性能。为了确定生境的选择,监测了分株的数量和它们生根的地方。
关键结果:异质环境中的父母分株显示出光系统II的最大和有效量子产率显着高于同质环境中的父母。与同质环境中的父母相比,异质环境中的父母对光合生物量和茎/总生物量的投资也显着增加,产生的sto茎更长,平均叶片尺寸也更大。在两种环境中,总生物量和后代分株的数量相似。但是,同质环境中的植物显示后代分株随机分配到周围斑块,而异质环境中的植物显示后代优先分配给更高质量的斑块。
结论:研究结果表明,vesca F. vesca采用生理和形态学策略,能够在异质环境中进行有效的资源觅食,并从光合作用效率方面证明了生理整合的益处。研究结果表明,短期反应不能直接推断到较长期,主要是因为高质量斑块的优先定植意味着这些斑块最终显示出降低的质量。这突出了在检查克隆植物对异质性反应的实验中考虑时间因素的重要性。

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