| 引用本文: | 欧阳子龙, 贾湘璐, 廖宏英, 滕维超, 韦艳梅.池杉和落羽杉转色期叶片衰老过程的生理特征差异[J].广西植物,2025,45(6):1122-1136.[点击复制] |
| OUYANG Zilong, JIA Xianglu, LIAO Hongying, TENG Weichao, WEI Yanmei.Differences in physiological characteristics of leaf senescence during color transition period between Taxodium ascendens and T. distichum[J].Guihaia,2025,45(6):1122-1136.[点击复制] |
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| 池杉和落羽杉转色期叶片衰老过程的生理特征差异 |
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欧阳子龙1,2,3, 贾湘璐1,2,3, 廖宏英1,2, 滕维超3, 韦艳梅4*
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1. 南宁青秀山风景名胜旅游开发有限责任公司, 南宁 530004;2. 南宁植物园, 南宁 530002;3. 广西大学 林学院, 南宁 530004;4. 中共广西区委党校, 南宁 530213
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| 摘要: |
| 池杉和落羽杉秋冬季转色期叶片逐渐变为橙(红)色,是常见的园林色叶树种。分析池杉和落羽杉转色期叶片生理特性,对于理解这2种杉木衰老变色的过程极为关键,可为后期园林色叶景观树种的应用提供指导。该研究通过对池杉和落羽杉转色期衰老叶片中色素含量、抗氧化酶活性、渗透调节物质含量、丙二醛(MDA)含量和叶绿素荧光参数进行测定,结合显著性差异分析、相关性分析、线性拟合和隶属函数分析等统计方法,综合评价池杉和落羽杉转色期衰老叶片的生理状态,探究2种杉木叶片衰老的生理差异。结果表明:(1)池杉和落羽杉叶片色素AC/CHLa+b比值随衰老而迅速升高,最高分别为11.46和7.13,是叶片呈橙(红)色的直接原因。(2)衰老过程中池杉和落羽杉叶片超氧化物歧化酶(SOD)、过氧化氢酶(CAT)的活性和可溶性糖含量均下降,MDA含量先升高再降低,但过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)和苯丙氨酸解氨酶(PAL)的活性升高,表现为叶片对衰老的抵抗效应。(3)光化学转化效率和热耗散能力能够较好地表示生理生化指标的变化情况,反映衰老过程。(4)同一时间池杉综合得分均低于落羽杉,表明落羽杉生理状态更佳。综上认为,池杉和落羽杉叶片衰老过程具有相似的生理特性,但池杉更早进入衰老变色,在景观应用中可将池杉和落羽杉配合种植以延长整体色叶观赏期。 |
| 关键词: 池杉, 落羽杉, 秋色叶, 叶绿素荧光, 衰老过程 |
| DOI：10.11931/guihaia.gxzw202404059 |
| 分类号:Q945 |
| 文章编号:1000-3142(2025)06-1122-15 |
| 基金项目:国家自然科学基金(31800530); 广西自然科学基金(2023GXNSFAA026485); 广西城市绿地生态系统服务价值评估相关参数体系研究与开发项目(20200321); 南宁青秀山风景名胜区管理委员会重点植物研究课题项目(2023)。 |
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| Differences in physiological characteristics of leaf senescence during color transition period between Taxodium ascendens and T. distichum |
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OUYANG Zilong1,2,3, JIA Xianglu1,2,3, LIAO Hongying1,2, TENG Weichao3, WEI Yanmei4*
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1. Nanning Qingxiu Mountain Scenic Spots Tourism Development Co., Ltd., Nanning 530004, China;2. Nanning Botanical
Garden, Nanning 530002, China;3. College of Forestry, Guangxi University, Nanning 530004, China;4. Party
School of Guangxi District Committee of CPC, Nanning 530213, China
1. Nanning Qingxiu Mountain Scenic Spots Tourism Development Co., Ltd., Nanning 530004, China; 2. Nanning Botanical
Garden, Nanning 530002, China; 3. College of Forestry, Guangxi University, Nanning 530004, China; 4. Party
School of Guangxi District Committee of CPC, Nanning 530213, China
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| Abstract: |
| During the autumn and winter seasons, both Taxodium ascendens and T. distichum undergo a color transition period in which their leaves gradually turn orange or red, making them common ornamental trees with colored foliage in gardens. Analyzing the physiological characteristics of leaf color transition period in these two species is crucial for understanding the aging and coloring processes of these trees, providing valuable guidance for the application of ornamental trees with colored leaves in garden landscapes. This study conducted measurements on pigment content, antioxidant enzyme activity, osmoregulatory substance contents, malondialdehyde(MDA)content, and chlorophyll fluorescence parameters in aging leaves of T. ascendens and T. distichum during the color transition period. Statistical methods such as significant difference analysis, correlation analysis, linear fitting, and membership function analysis were employed to comprehensively evaluate the physiological state of aging leaves from both species. The results were as follows:(1)The AC/CHLa+b ratio in T. ascendens and T. distichum leaves increased rapidly with age reaching 11.46 and 7.13 respectively; this directly contributed to the orange-red hue observed in their foliage.(2)During aging processes, superoxide dismutase(SOD)and catalase(CAT)activities and soluble sugar content decreased while MDA content first increased and then decreased; however peroxidase(POD), ascorbate peroxidase(APX), and phenylalanine ammonialyase(PAL)activities increased, indicating a resistance effect against leaf senescence.(3)The photochemical conversion efficiency and heat dissipation ability could represent the change of physiological and biochemical indexes well, and reflect the aging process.(4)Comprehensive scores showed that at any given time T. ascendens consistently exhibited lower scores than T. distichum suggesting superior physiological status for T. ascendens. In conclusion, T. ascendens and T. distichum demonstrate similar physiological characteristics of leaf senescence but T. ascendens enteres into this phase earlier than T. distichum. In landscape applications combining plantings of T. ascendens alongside T. distichum can extend overall periods for colorful foliage display. |
| Key words: Taxodium ascendens, Taxodium distichum, autumn leaves, chlorophyll fluorescence, aging process |
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