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| Adaptation mechanism of intercropped plant roots of Arabis alpina L.var. parviflora Franch and Zea mays L. to Pb patches stress |
| Received:September 12, 2019 |
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| KeyWord:root box experiment;intercropping;patches;approach behavior;lead stress |
| Author Name | Affiliation | E-mail | | WANG Ji-xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Zu-ran | College of Horticulture and Landscape, Yunnan Agricultural University, Kunming 650201, China | | | LI Bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yan-qun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | zuyanqun@ynau.edu.cn | | HE Yong-mei | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | |
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| Abstract: |
| 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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