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首页> 外文期刊>Ecological research >The effects of rooting frequency and position of rooted ramets on plasticity and yield in a clonal species: an experimental study with Glechoma hederacea
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The effects of rooting frequency and position of rooted ramets on plasticity and yield in a clonal species: an experimental study with Glechoma hederacea

机译：生根频率和生根分株的位置对无性系可塑性和产量的影响：Glechoma hederacea的实验研究

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Clonal plants produce numerous ramets that can be distributed over a considerable area. Resources are translocated between ramets, especially when they occupy microsites of different quality, or places where leaves or roots cannot be deployed. It is common for a proportion of the ramets of clones and clonal fragments to lack roots. We conducted a greenhouse study using clonal fragments of Glechoma hederacea to examine the effects of differences in the number and position of rooted ramets on yield and plasticity of clonal fragments. We hypothesized that (1) mass of roots and root mass ratio would increase as the number of rooted ramets decreased, (2) plasticity in rooted ramets would buffer the clonal fragment against reduction in yield as the number of rooted ramets declined, (3) ramet plasticity in response to the absence of rooting, and the beneficial effects of this plasticity, would be greater when older ramets were rooted. The same yield was achieved in clonal fragments with only one out of four ramets rooted as in clonal fragments with all four of their ramets rooted, regardless of whether rooting was confined to older or younger ramets. Plasticity in biomass allocated to roots was greater in older rooted ramets succeeded by unrooted ramets than in younger rooted ramets preceded by unrooted ramets. Modular plasticity, involving both direct responses to local conditions, and indirect responses to the conditions experienced by connected modules, buffered performance against variation in rooting ability, enabling clonal fragments to maintain their yield and lateral expansion even when a high proportion of their ramets lacked roots.
机译：克隆植物产生许多分株，可以分布在相当大的区域。资源在分株之间转移，尤其是当它们占据质量不同的微地点或无法部署叶或根的地方时。一定比例的克隆和克隆片段的分株缺乏根是很普遍的。我们进行了温室研究，使用无花果假单胞菌的克隆片段检查生根分株的数量和位置差异对克隆片段产量和可塑性的影响。我们假设（1）随着生根分株数量的减少，根的质量和根质量比将增加；（2）生根分株中的可塑性将缓冲克隆片段，防止生根分株的数量减少，降低产量；（3）当较老的分株生根时，由于没有生根而引起的分株可塑性以及这种可塑性的有益效果会更大。在克隆片段中，只有四个生根的根中有一个是与在克隆片段中四个生根都已生根的情况下获得的产量相同，而不管生根是局限于年龄较大的还是较年轻的分株。由无根分株继承的较早生根的分株中，分配给根的生物量的可塑性比无根分株之后的较年轻生根的分株更大。模块化可塑性，既包括对局部条件的直接响应，也包括对连接模块所经历的条件的间接响应，缓冲了针对生根能力变化的性能，即使在大部分分株没有根的情况下，克隆片段也可以保持产量和侧向扩展。

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