| 6种野牡丹属植物种子萌发期耐镉性和耐铅性研究 |
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| 引用本文： | 刘晓洲,张信坚,易慧琳,周仁超,谭广文.6种野牡丹属植物种子萌发期耐镉性和耐铅性研究[J].中国农学通报,2020,36(31):42-48. |
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| 作者姓名： | 刘晓洲 张信坚 易慧琳 周仁超 谭广文 |
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| 作者单位： | 1.广州普邦园林股份有限公司,广州 510627;2.中山大学生命科学学院,广州 510275 |
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| 基金项目： | 广州市越秀区蹬羚企业项目“泛热带地区野牡丹科种质资源收集及野牡丹属新品种的培育与应用示范”(2018-GX-001) |
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| 摘 要： | 探究6种野牡丹属植物种子萌发期分别对镉和铅的耐受性,为筛选耐镉、耐铅野牡丹属植物应用于重金属污染土壤修复提供参考依据。以6种野牡丹种子为试验材料,按镉浓度（按Cd2+计）为0、5、10、50 mg/L,铅浓度（按Pb2+计）为0、200、500、1000 mg/L的胁迫处理进行萌发试验,测定不同浓度镉、铅胁迫下各种野牡丹属植物种子萌发期的萌发率、萌发指数、活力指数、胚轴长和幼根长等指标,采用隶属函数法和聚类分析对6种野牡丹属植物种子的耐镉性和耐铅性进行评价与分类。6种野牡丹属植物种子的萌发率、萌发指数、活力指数、胚轴长和幼根长均随着镉、铅浓度的升高呈下降趋势;镉、铅胁迫对幼根生长的抑制作用大于对胚轴生长的抑制作用;供试的6种野牡丹属植物的耐镉性和耐铅性存在差异,通过隶属函数综合值和聚类分析发现,印度野牡丹、野牡丹和‘天骄’具有较强的耐镉性和耐铅性,而毛稔、‘云彩’和‘超群’耐镉性和耐铅性较差。印度野牡丹、野牡丹和‘天骄’耐镉性和耐铅性较强,可作为先锋植物用于镉、铅污染土壤生态恢复。
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| 关 键 词： | 野牡丹 镉胁迫 铅胁迫 种子萌发 耐镉性 耐铅性 |
| 收稿时间： | 2019-12-11 |
The Cadmium and Lead Tolerance of Six Species of Melastoma Plants During Germination |
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| Liu Xiaozhou,Zhang Xinjian,Yi Huilin,Zhou Renchao,Tan Guangwen.The Cadmium and Lead Tolerance of Six Species of Melastoma Plants During Germination[J].Chinese Agricultural Science Bulletin,2020,36(31):42-48. |
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| Authors: | Liu Xiaozhou Zhang Xinjian Yi Huilin Zhou Renchao Tan Guangwen |
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| Institution: | 1.Pubang Landscape Architecture Co., Ltd., Guangzhou 510627;2.School of Life Sciences, Sun Yat-sen University, Guangzhou 510275 |
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| Abstract: | The paper aims to explore the tolerance of cadmium and lead of six species of Melastoma plants at the germination stage, and to provide a reference for screening cadmium-resistant and lead-resistant Melastoma plants for remediation of heavy metal polluted soil. The seeds of 6 Melastoma species were used as experimental materials, the germination test was carried out under the stress treatment of cadmium concentration (calculated as Cd2+) of 0, 5, 10, and 50 mg/L, and lead concentration (calculated as Pb2+) of 0, 200, 500, and 1000 mg/L. The germination rate, germination index, vigor index, hypocotyl length and radical length of Melastoma seeds during germination stage were determined under different gradients of cadmium and lead stress respectively. The membership function method and cluster analysis were used to evaluate and classify the cadmium and lead tolerance of the 6 species of Melastoma plants. The germination rate, germination index, vigor index, hypocotyl length and radical length of the 6 species of Melastoma plants showed a downward trend with the increase of cadmium and lead concentrations. Cadmium and lead stress could inhibit the growth of radical more than the hypocotyl growth. There were differences in cadmium and lead tolerance among the 6 species of Melastoma plants. It is found that Melastoma malabathricum, Melastoma candidum and Melastoma ‘Tianjiao’ have strong cadmium resistance and lead resistance, while Melastoma sanguineum, Melastoma ‘Yuncai’ and Melastoma ‘Chaoqun’ have poor cadmium resistance and lead resistance by comprehensive value of membership function and cluster analysis. Melastoma malabathricum, Melastoma candidum and Melastoma ‘Tianjiao’ have strong resistance to cadmium and lead, and can be used as pioneer plants for ecological restoration of soils polluted by cadmium and lead. |
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| Keywords: | Melastoma cadmium stress lead stress seed germination cadmium resistance lead resistance |
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