Clonal integration driven by source-sink relationships is constrained by rhizome branching architecture in a running bamboo species (Phyllostachys glauca): A 15N assessment in the field
Clonal integration driven by source-sink relationships is constrained by rhizome branching architecture in a running bamboo species (Phyllostachys glauca): A 15N assessment in the field
复制标题
由源库关系驱动的克隆整合受到运行竹种（Phyllostachys glauca）根茎分支结构的限制：现场 15N 评估
DOI：
10.1016/j.foreco.2020.118754
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发表时间：
2021-02-01
影响因子：
3.7
通讯作者：
Yang, Qingpei
中科院分区：
文献类型：
--
作者：
Shi, Jianmin;Mao, Siyu;Yang, Qingpei
源-汇关系和分支结构是克隆整合的两个决定因素，但它们对资源迁移的共同影响尚不清楚。我们的目的是阐明由源-汇关系和分支架构控制的资源迁移模式和机制。本研究对毛竹（Phyllostachys glauca） 6块地进行了n -15示踪试验。根据未成熟和成熟品种的汇强度将其划分为强汇和弱汇，并结合根茎分枝结构将综合品种划分为零屏障区和屏障区。各品种氮素-15的易位随时间呈对数分布，在标记后第5周左右达到峰值。从空间上看，N-15先在3天内出口到零隔离区，然后在3周内出口到隔离区。无屏障区品种的转运强度（1653.2 ppm /d）、速度（1.95 m/d）和数量（39.9 mg kg(-1)）显著高于屏障区品种（61.3 ppm /d、0.86 m/d、2.3 mg kg（-1）和1.4周），转运时间（3 d）显著缩短。在零屏障区，未成熟品种的转运强度和数量分别是成熟品种的6.7倍和3.4倍。在隔离带内，未成熟分株和成熟分株的易位性状（强度、速度、时间、数量）基本一致。此外，距离不影响氮转运模式，也不影响根茎分枝结构和源库关系对氮转运的影响。氮的转运主要受根状茎分枝结构的限制在零屏障区，源库关系在此起作用。在青玉无性系整合过程中，源库关系是驱动力，而根茎分枝结构是流量限制。研究结果可为活竹的防治和施肥提供参考。
Source-sink relationships and branching architecture are two determinants of clonal integration, but their joint effects on resource translocation are still unclear. Our aim was to elucidate the pattern and mechanism of resource translocation controlled by source-sink relationships and branching architecture. We conducted a N-15-tracing experiment in six plots of a running bamboo, Phyllostachys glauca, in the field. The immature ramets and mature ramets were defined as strong sinks and weak sinks according to their sink strength, and the territories of integrated ramets were classified into zero-barrier zones and barrier zones considering rhizome branching architecture. The translocation of N-15 for all ramets showed a logarithmic pattern over time with a peak around the fifth week after labelling. Spatially, N-15 was exported first to ramets in zero-barrier zones within three days and then to ramets in barrier zones within three weeks. Ramets in zero-barrier zones had a significantly higher translocation intensity (1653.2 parts per thousand), speed (1.95 m/day) and amount (39.9 mg kg(-1)), and a shorter translocation time (three days) than ramets in barrier zones (61.3 parts per thousand, 0.86 m/day, 2.3 mg kg(-1) and 1.4 weeks, respectively). In zero-barrier zones, translocation intensity and amount in immature ramets were 6.7 and 3.4 times greater than those in mature ramets, respectively. In barrier zones, translocation traits (intensity, speed, time, amount) of immature ramets and mature ramets were similar. In addition, distance did not affect nitrogen translocation pattern or the effects of rhizome branching architecture and source-sink relationships on nitrogen translocation. The nitrogen translocation was mainly confined in zero-barrier zones by rhizome branching architecture, where source-sink relationships worked. In the clonal integration of P. glauca, source-sink relationships are the driving forces, while rhizome branching architecture acts as a flow restrictor. The results provide implications for spreading control and fertilizer applications on running bamboos.