| HgCl2胁迫对东方百合叶烧指数和水分利用效率的影响 |
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| 引用本文： | 杨爽,袁晓娜,王中轩,祝璞,贾桂霞.HgCl2胁迫对东方百合叶烧指数和水分利用效率的影响[J].北京林业大学学报,2016,38(5):114-119. |
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| 作者姓名： | 杨爽 袁晓娜 王中轩 祝璞 贾桂霞 |
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| 作者单位： | 1.1 花卉种质创新与分子育种北京市重点实验室,国家花卉工程技术研究中心,城乡生态环境北京实验室,北京林业大学园林学院; |
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| 基金项目： | 林业公益性行业科研专项(201204609)。 |
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| 摘 要： | 东方百合部分品种在冬季栽培中极易发生叶烧,成为影响百合切花和盆花质量的主要因素之一。叶烧的发生与水分代谢有关,为探寻百合叶烧的发生是否和水通道蛋白相关,本文采用3种不同浓度的水通道蛋白抑制剂HgCl2(50、100和200μmol/L),对叶烧敏感程度不同的2个东方百合品种进行灌根处理,结果表明:随着HgCl2浓度增加,‘Sorbonne'的叶烧指数分别比对照增加了13.56%、36.06%和42.19%;‘Siberia'分别比对照增加了7.20%、12.15%和18.00%。‘Sorbonne'和‘Siberia'的株高、茎粗、叶面积、茎生根长度、茎生根厚度和根系活力、净光合速率和蒸腾速率都受到了不同程度的抑制。其中,HgCl2处理对根系活力的抑制作用最大,3种不同浓度的HgCl2处理后‘Sorbonne'的根系活力分别比对照降低了41.9%、54.7%和67.5%;‘Siberia'的根系活力分别比对照降低了4.8%、33.5%和38.2%。从水分利用效率情况来看,随着HgCl2浓度增加,‘Sorbonne'的水分利用效率分别比对照降低了14.00%、19.23%和46.06%;‘Siberia'的水分利用效率分别比对照降低了8.62%、17.60%和28.71%。由此可知,不同浓度HgCl2胁迫处理抑制了‘Sorbonne'和‘Siberia'的水分运输,显著增加了植物叶烧指数,初步推测百合叶烧发生的程度与植物水通道蛋白的表达有一定的相关性。
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| 关 键 词： | HgCl2 水通道蛋白 东方百合 叶烧指数 水分利用效率 |
| 收稿时间： | 2015-08-27 |
Effects of HgCl2 stress on the upper leaf necroses and water use efficiency of oriental hybrid lilies |
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| Institution: | 1.1 Beijing Key Laboratory of Ornamental Plants Germplasm Innovation & Molecular Breeding, National Engineering Research Center for Floriculture, Beijing Laboratory of Urban and Rural Ecological Environment and College of Landscape Architecture, College of Landscape Architecture, Beijing Forestry University, Beijing, 100083, P. R. China;2.2 Logistics Group, North China University of Technology, Beijing, 100144, P. R. China. |
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| Abstract: | Some of the oriental hybrid lily cultivars are prone to upper leaf necrosis ( ULN) , which has become a major threat to the quality of cut and pot lilies. The ULN of oriental lily is believed to relate with water metabolism. In order to explore the relationship between ULN of lilies and the aquaporin, we used three different concentrations of aquaporin inhibitor HgCl2 ( 50, 100 and 200 μmol/L ) to irrigate two lily cultivars which are different in sensitivity to ULN. The result showed that with the increasing concentrations of HgCl2 , the ULN indexes of the cultivar ‘Sorbonne ' were increased by 13. 56%, 36. 06% and 42. 19%, respectively, compared with the contrast; for the cultivar ‘Siberia', the ULN indexes were increased by 7. 20%, 12. 15% and 18. 00%, respectively. The height, stem diameter, leaf area, root length, activity of stem shooting roots, net photosynthetic rate and transpiration rate of‘Sorbonne' and ‘Siberia' were inhibited to varying degrees, especially for the root activity. The root activities of ‘Sorbonne' were reduced by 41. 9%, 54. 7% and 67. 5%, respectively, compared to the contrast after treated with three concentrations of HgCl2; for ‘Siberia' , the root activities were reduced by 4. 8%, 33. 5% and 38. 2%, respectively. The WUEs of ‘Sorbonne' were decreased by 14. 00%, 19. 23% and 46. 06% after HgCl2 treatment, while those of ‘Siberia ' were decreased by 8. 62%, 17. 60% and 28. 71%, respectively. The following conclusions could be drawn: with different levels of HgCl2 stress, the water transportation of ‘Sorbonne' and ‘Siberia' was inhibited, and the ULN indexes were increased. We initially speculate that the degree of ULN of lilies is related to the expression of plant aquaporins. |
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| Keywords: | HgCl2 aquaporin oriental lilies upper leaf necroses index water use efficiency |
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