| 戴 伟1，2，王 刚1，胡振阳1，谭广文1.五种园林灌木对NaCl胁迫的光合特性响应比较研究[J].广东农业科学,2018,45(7):48-55 |
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五种园林灌木对NaCl胁迫的光合特性响应比较研究 |
| Comparative study on photosynthetic characteristicsresponses of 5 garden shrubs under NaCl stress |
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| DOI：10.16768/j.issn.1004-874X.2018.07.008 |
| 中文关键词: 盐胁迫 灌木 光合气体交换效率 荧光动力参数 |
| 英文关键词: NaCl stress shrubs photosynthesis index chlorophyll fluorescence dynamics index |
| 基金项目:广州市越秀区科技计划项目（2017-GX-022） |
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| 摘要点击次数: 1553 |
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| 中文摘要: |
| 以夹竹桃（Thevetia peruviana）、海桐（Pittosporum tobira）、花叶假连翘（Duranta repens）、朱槿（Hibiscus rosa-sinensis）、蔓马缨丹（Lantana montevidensis）5种华南滨海地区常用园林灌木为材料，于种植土中添加不同梯度NaCl（含盐量为100、300 mmol/kg）人工盐处理模拟华南滨海地区土壤，研究植株胁迫20 d和40 d的光合气体交换效率及荧光动力变化情况。随着盐胁迫时间的延长，5种灌木的净光合速率（Pn）、气孔导度（Gs）和胞间CO2浓度（Ci）均逐渐降低，且随着胁迫浓度增加趋势进一步加强。5种灌木的非光化学淬灭系数（NPQ）和非调节性能量耗散量子产额Y（NO）均逐步增加，且随着胁迫浓度增加趋势进一步加强。在100 mmol/kg浓度盐胁迫下，花叶假连翘的蒸腾速率（Tr）随着时间的延长先减少后增加，海桐和蔓马缨丹逐渐减少；在300 mmol/kg浓度盐胁迫下，花叶假连翘的Y（NO）先减少后增加，其他灌木逐渐减少。在100 mmol/kg浓度盐胁迫下蔓马缨丹的有效光化学量子产量Y（Ⅱ）先减少后增加，其他灌木逐渐减少；在300 mmol/kg浓度盐胁迫下5种灌木的Y（Ⅱ）逐渐减少。隶属函数综合评价结果表明，5种灌木耐盐性表现为夹竹桃＞海桐＞朱槿＞蔓马缨丹＞花叶假连翘。 |
| 英文摘要: |
| Five garden shrubs commonly used in Southern China coastal areas were selected as research materials, including Thevetia peruviana, Pittosporum tobira, Duranta repens, Hibiscus rosa-sinensis and Lantana montevidensis. Different gradients of salt content from 100 mmol/kg and 300 mmol/kg were applied in the planted soil, to analyze the changes in photosynthesis and chlorophyll fluorescence dynamics index in different stress duriation for 20 d and 40 d. With the prolongation of salt stress time, the Pn, Gs and Ci of the 5 shrubs decreased gradually, and further strengthened with the increase of stress concentration. The NPQ and Y（NO）of 5 shrubs increased gradually, and were further strengthened with the increasing trend of stress concentration. Under the stress of 100 mmol/kg concentration, the Tr decreased with the increase of time gradually. Under the stress of 300 mmol/kg, the Y（NO）of Duranta repens increased first, and the other shrubs decreased gradually. The Y（Ⅱ）of Lantana montevidensis decreased and the other shrubs decreased gradually, and the Y（Ⅱ）of 5 shrubs decreased gradually under the concentration of 300 mmol/kg. The results showed that the salt tolerance of these 5 shrubs was: Thevetia peruviana＞ Pittosporum tobira ＞Hibiscus rosa-sinensis＞ Lantana montevidensis＞Duranta repens. |
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