| 王吉秀,李祖然,李博,李元,湛方栋,祖艳群,何永美.间作植物根系对Pb斑块胁迫适应机制[J].农业环境科学学报,2019,38(12):2738-2748. |
| 间作植物根系对Pb斑块胁迫适应机制 |
| Adaptation mechanism of intercropped plant roots of Arabis alpina L.var. parviflora Franch and Zea mays L. to Pb patches stress |
| 投稿时间：2019-09-12 |
| DOI：10.11654/jaes.2019-0886 |
| 中文关键词: 根箱试验 间作 斑块 趋向行为 铅胁迫 |
| 英文关键词: root box experiment intercropping patches approach behavior lead stress |
| 基金项目:国家自然科学基金项目（41761073，41967049，41867055）；云南农业大学自然科学青年基金项目（2015ZR06）；云南省农田无公害生产创新团队项目（2017HC015）；云南省重点研发计划项目（2018BB017，2019BC001-04） |
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| 中文摘要: |
| 为研究间作体系植物根系受Pb胁迫的形态学适应机制，利用根箱试验设计Pb斑块胁迫下玉米、小花南芥单作和玉米与小花南芥间作处理。结果表明：在Pb斑块（0、1000 mg·kg-1）处理根箱条件下，间作小花南芥根生物量的相对关系指数显著增加，小花南芥根趋向有Pb斑块生长，根系表面积显著增加，间作模式极显著影响小花南芥根系形态；间作玉米根生物量的相对关系指数显著降低，玉米根趋向无Pb斑块生长，Pb处理极显著影响玉米根系形态。径级在1.5 mm<d3 ≤ 2.5 mm根表面积显著影响间作小花南芥与玉米对Pb的响应。研究表明，根间相互作用激发小花南芥根系趋向Pb斑块，玉米根系趋向无Pb斑块，揭示了超富集植物与作物间作体系促进两种植物根系趋向性适应的重要原因。 |
| 英文摘要: |
| Much attention has been paid to the remediation of moderate heavy metal contaminated soil by the intercropping of hyperaccumulator and crop. There was a significant difference in the heavy metal contents between the two plants growing in the same soil space. The morphological mechanism of plant roots adapting to Pb patches stress in the intercropping process was not clear. The root box experiments were conducted with monocropping maize, monocropping A. alpina, intercropping maize, and A. alpina on Pb patches stress. This study aimed to explain plant root tendency to adapt to Pb patches stress. The results showed that the relative index of the biomass and surface area of intercropped A. alpina roots increased significantly, and the roots of A. alpina tended to grow under Pb-patch treatment of 1000 mg· kg-1 Pb. The intercropping pattern significantly affected the root morphology of A. alpine. The relative index of the biomass of intercropped maize roots significantly decreased and maize roots tended to grow in non-Pb patches. The root morphology of maize was significantly affected by Pb stress. The root surface area with 1.5 mm<d3(diameter) ≤ 2.5 mm significantly affected the response of the intercropping A. alpina and maize to Pb stress. The results suggested that the interroot interaction could stimulate the affinity of A. alpina for Pb-patches and influence maize roots to grow in non-Pb patches, which revealed the main cause and adaptation mechanism of hyperconcentration and crop intercropping system under Pb stress. |
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