An analysis of the costs and benefits of physiological integration between ramets in the clonal perennial herb Glechoma hederacea
An analysis of the costs and benefits of physiological integration between ramets in the clonal perennial herb Glechoma hederacea
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DOI：
10.1007/bf00385260
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发表时间：
1987-09
期刊：
影响因子：
2.7
通讯作者：
A. Slade;M. Hutchings
中科院分区：
文献类型：
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作者：
A. Slade;M. Hutchings
以干重衡量，克隆株之间的生理整合的成本和收益在两个克隆草本植物Glechoma hederacea上进行了两个实验。首先，在一项实验中检验了连续产生的分株之间的整合，在该实验中，匍匐茎从一组生长条件(无论是未遮荫还是遮荫，无论是营养丰富还是营养贫乏)生长到改变光照或营养水平的条件下。比较了改变生长条件前后的无性系部分干重和恒定生长条件下对照无性系相应部分的干重。在第二个实验中，G的两个不同部分之间的整合。对海德赛克隆氏菌进行了研究。在本实验中，无性系从两个相连的亲本分株上生长，每个亲本分株产生的无性系部分独立地接受营养丰富或营养贫乏的条件。资源丰富的分株为资源贫乏的分株提供了相当大的生理支持。这是以与在资源匮乏条件下生长的对照克隆的相应部分的重量相比的干重增加来衡量的。然而，当匍匐茎从资源贫乏的条件成长为资源丰富的条件时，没有类似的证据表明资源贫乏的斜坡地得到了资源丰富的分株的支持。生理整合并没有导致干重增加，而这需要资源的基瓣转移。这是因为移位的主要运动方向是顶端。该无性系的结构在决定分株间整合的有效性方面很重要。在生理整合有效的地方，支持分株的干重成本是微不足道的。生理整合使无性系能够在不太有利的地点保持存在，而对有利地点的分株的成本微乎其微，从而减少了其他植物入侵的可能性，并在条件改善时提供了快速克隆生长的潜力。在不利条件下对分株的综合支持也使克隆能够在不利的地点生长，从而增加了通过更广泛的觅食遇到更有利条件的可能性。
The costs and benefits, measured in terms of dry weight, of physiological integration between clonal ramets, were analysed in two experiments conducted on the clonal herbGlechoma hederacea. Firstly, integration between consecutively-produced ramets was examined in an experiment in which stolons grew from one set of growing conditions (either unshaded or shadedandeither nutrient-rich or nutrient-poor) into conditions in which light or nutrient level was altered. Comparisons were made between the dry weight of the parts of the clones produced before and after growing conditions were changed, and the dry weights of the corresponding part of control clones subjected to constant growing conditions. In a second experiment, integration between two distinct parts ofG. hederaceaclones was investigated. In this experiment clones were grown from two connected parent ramets and the parts of the clone produced by each parent ramet were subjected independently to either nutrient-rich or nutrient-poor conditions. Ramets in resource-rich conditions provided considerable physiological support to those in resource-poor conditions. This was measured as a dry weight gain compared with the weight of the corresponding part of the control clones growing in resource-poor conditions. However, when stolons grew from resource-poor conditions into resource-rich conditions, there was no similar evidence of the resourcepoor ramtes receiving support from resource-rich ramets. Physiological integration did not result in dry weight gains when this would have necessitated basipetal translocation of resources.Because of the predominantly acropedal direction of movement of translocates inG. hederacea, the structure of the clone was important in determining the effectiveness of integration between ramets. Where physiological integration was effective, the cost to the supporting ramets in terms of dry weight was insignificant. Physiological integration allows clones to maintain a presence in less favourable sites with insignificant cost to ramets in favourable sites, thereby reducing the probability of invasion by other plants, and providing the potential for rapid clonal growth if conditions improve. Integrated support of ramets in unfavourable conditions also enables the clone to grow through unfavourable sites, thus increasing the probability of encountering more favourable conditions by wider foraging.