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杨再强,韩冬,王学林,金志凤.寒潮过程中4个茶树品种光合特性和保护酶活性变化及品种间差异.生态学报,2016,36(3):629~641 本文二维码信息
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寒潮过程中4个茶树品种光合特性和保护酶活性变化及品种间差异
Changes in photosynthetic parameters and antioxidant enzymatic activity of four tea varieties during a cold wave
投稿时间:2014-05-13  修订日期:2015-10-16
DOI: 10.5846/stxb201405130981
关键词茶树  寒潮  光合特性  保护酶活性  主成分分析
Key WordsCamellia sinensis  cold wave  photosynthetic parameters  protective enzyme activities  principal component analysis
基金项目公益(气象)行业科研专项(GYHY201306037); 国家十二五科技支撑计划项目(2014BAD10B70)
作者单位E-mail
杨再强 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044;南京信息工程大学江苏省农业气象重点实验室, 南京 210044 yzq@nuist.edu.cn 
韩冬 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044  
王学林 南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044  
金志凤 浙江省气象服务中心, 杭州 310017  
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摘要:
以茶树品种龙井43号(Longjing No.43)、鸠坑(Jiukeng)、乌牛早(Wuniuzao)、福鼎大白茶(Fortin white tea)为试材,研究了一次寒潮过程对4个茶树品种叶片的光合特性、叶绿素荧光参数和保护酶活性的影响,并利用主成分分析方法确定4个茶树品种的抗寒性。结果表明:寒潮初期,随着气温的降低,4个茶树品种的叶绿素含量、最大光合速率(Pmax)、表观量子效率(AQY)、最大光化学量子产量(Fv/Fm)、非光化学淬灭(qN)均呈现下降趋势,在气温回升期间随气温升高而有所增加,且福鼎大白茶的叶绿素含量、Pmax、AQY、Fv/Fm的值为4个品种中最大,qN的平均值以乌牛早为最小,鸠坑最大;4种茶树的过氧化物酶(POD)活性在寒潮及恢复期间持续增强;4种茶树POD活性的平均值以龙井43号最小,福鼎大白茶最大;叶片的气孔限制值(Ls)和丙二醛(MDA)含量在降温和气温回升过程中,表现出先增加后降低的趋势,整个期间的Ls和MDA含量的平均值以福鼎大白茶为最小,龙井43号最大;利用主成分分析法对4品种茶树的光合参数、荧光参数和抗氧化酶活性进行分析,得到4个品种茶树的抗寒性顺序为:福鼎大白茶 > 乌牛早 > 鸠坑 > 龙井43号。研究结果为茶树的引种及茶叶生产布局提供理论依据。
Abstract:
Tea plant (Camellia sinensis) cultivation has a long history in China. The range of optimum growth temperature of tea is considered to be between 20℃ and 30℃. Significant decrease in temperature during a cold wave can harm tea plantations. Cold stress is a major abiotic factor that affects photosynthesis, respiration, transpiration, and some other physiological processes such as antioxidant enzymatic activity. Previous studies have evaluated stress tolerance of plants using photosynthetic parameters, chlorophyll fluorescence parameters, and antioxidant enzymatic activity. Effects of cold stress on physiological and biochemical indices, as well as on photosynthetic parameters have been studied under environmentally controlled conditions. The objective of this study was to investigate the effect of cold wave on the photosynthetic parameters and antioxidant enzymatic activity in four green tea varieties, Longjing No.43, Jiukeng, Wuniuzao, and Fortin white tea under field conditions in 2013. Data on the daily temperature (minimum, maximum, and mean), daily relative humidity (minimum, maximum, and mean), and daily solar radiation were collected to identify the most important factor that affects the tea plant during the cold wave. The mean daily temperature was significantly reduced from November 23 to 25, reached the lowest value on Nov 28, and then began to rise. The total chlorophyll content, photosynthetic rate (Pmax), apparent quantum yield (AQY), PSⅡ photochemical efficiency (Fv/Fm), and non-photochemical quenching (qN) of all four tea varieties were initially decreased and then increased from November 23 to December 5. Fotin had the maximum values of chlorophyll content, Pmax, AQY, and Fv/Fm. Wuniuzao had the minimum mean value of qN. Jiukeng had the maximum mean value of peroxidase (POD) activity that increased continuously from November 23 to December 5, while Longjing No.43 and Fortin had the minimum values of POD activity. Stomatal limiting value (Ls) and malondialdehyde (MDA) contents increased initially and then decreased from November 23 to December 5; Longjing No.43 had the maximum mean value of MDA, while Fortin had the minimum mean value. The total chlorophyll content, Pmax, AQY, Fv/Fm, and qN were positively correlated with the minimum daily temperature, while Ls and POD activity were negatively correlated with the minimum daily mean temperature. The minimum daily mean temperature was the abiotic factor that had the most significant effect on the photosynthetic parameters and antioxidant enzymatic activity in all four tea varieties. Principal component analysis (PCA) provided a quantitative evaluation of photosynthetic parameters, fluorescence parameters, and antioxidant enzymatic activity under cold stress conditions. PCA showed that MDA content, Fv/Fm, and POD activity were the main factors that affected the biological activity in all four tea varieties. Cold tolerance evaluation index of Fortin and Longjing No.43 was the highest (8.38) and the lowest (-6.88), respectively. Both Wuniuzao and Jiukeng had moderate cold tolerance evaluation indices and the latter was less cold tolerant that the former. In response to cold stress, plants, including tea, have diverse mechanisms that allow them to mitigate and adjust to cold environmental conditions.
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