Slade Andrew J, Hutchings Michael J
School of Biological Sciences, University of Sussex, Falmer, Brighton, Sussex BN1 9QG, UK.
New Phytol. 1987 Aug;106(4):759-771. doi: 10.1111/j.1469-8137.1987.tb00177.x.
Two experiments were conducted in which the influence of size of clones and the persistence of stolon connections on subsequent development were examined in Glechoma hederacea. In the first experiment, clones were grown from either one unrooted ramet or from either one, two or three connected, rooted ramets, for 8 weeks, in either nutrient-rich or nutrient-poor sand. The survival, number of ramets and dry weight of the clones produced were dependent on the number of established ramets at the start of the experiment. Clones in nutrient-rich sand developed a greater number of ramets, stolon branches, total length of stolon, mean leaf area per ramet and total leaf area per clone than clones of corresponding initial size in nutrient-poor sand. In the second experiment, the stolon connections between ramets of G. hederacea clones growing in boxes were either left intact or severed soon after each ramet had rooted. After 10 weeks of growth, the total dry weight of the intact clones and the mean dry weight of their ramets were significantly greater than the corresponding values for severed clones. The spatial distribution of ramets showed marked differences between the treatments. Severed clones produced a greater number of rooted ramets within the boxes and a smaller number of unrooted ramets beyond the box edges than intact clones. Density of ramets more than doubled when stolons were severed. Maintenance of stolon connections in G. hederacea is advantageous because it improves the probability of daughter ramet survival, promotes rapid lateral expansion of the clone and reduces inter-ramet competition through the production of fewer, larger ramets.
进行了两项实验，研究了克隆大小和匍匐茎连接的持久性对连钱草后续生长发育的影响。在第一项实验中，克隆体由一个无根分株或一个、两个或三个相连的有根分株培育而成，在营养丰富或贫瘠的沙子中生长8周。所产生克隆体的存活率、分株数量和干重取决于实验开始时已定植的分株数量。与生长在营养贫瘠沙子中的相应初始大小的克隆体相比，生长在营养丰富沙子中的克隆体产生了更多的分株、匍匐茎分支、匍匐茎总长度、每个分株的平均叶面积和每个克隆体的总叶面积。在第二项实验中，生长在盒子里的连钱草克隆体分株之间的匍匐茎连接要么保持完整，要么在每个分株生根后不久切断。生长10周后，完整克隆体的总干重及其分株的平均干重显著高于切断克隆体的相应值。分株的空间分布在不同处理之间表现出明显差异。与完整克隆体相比，切断克隆体在盒子内产生的有根分株数量更多，在盒子边缘外产生的无根分株数量更少。当匍匐茎被切断时，分株密度增加了一倍多。连钱草中匍匐茎连接的维持是有利的，因为它提高了子分株存活的概率，促进了克隆体的快速横向扩展，并通过产生更少、更大的分株减少了分株间的竞争。
