越南多毛金花茶的光合特性和叶解剖结构对不同光强的响应
Response of Photosynthesis Characteristics and Anatomical structure in Leaves of Vietnam Camellia hirsute under different Light Intensity
投稿时间:2019-01-17  修订日期:2019-04-10
DOI:
中文关键词:  越南多毛金花茶(Camellia hirsute Hakoda et Ninh)  光照处理  光合特性  叶解剖结构
英文关键词:Vietnam Camellia hirsute  light treatment  photosynthesis characteristics  leave anatomical structure
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作者单位E-mail
王坤 广西林业科学研究院 wk0728@126.com 
韦晓娟 广西林业科学研究院  
刘凯 广西林业科学研究院  
李开祥 广西林业科学研究院 lkx202@126.com 
马锦林 广西林业科学研究院  
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中文摘要:
      【目的】以越南多毛金花茶(Camellia hirsute Hakoda et Ninh)为实验材料,开展不同光照处理对多毛金花茶光合特性、叶解剖结构及光合色素含量的影响研究,为越南金花茶引种栽培和抚育管理提供理论依据。【方法】于2017年5月上旬,将越南多毛金花茶置于不同光强(10%、20%、30%、40%、50%光照强度)的遮荫棚内生长。通过覆盖不同层数的遮荫网以获得。处理时间两个月。【结果】不同光照处理下多毛金花茶净光合速率日变化趋势不同,20%、30%光照处理显著提高了多毛金花茶叶片净光合速率、蒸腾速率、气孔导度,同时蒸汽压亏缺降低,促进光合作用的进行,达到显著性差异;(P?0.05),在30%光照处理下,光合色素的含量最高,而叶绿素a/b的值则最低,30%光照条件下更有利于多毛金花茶叶片中叶绿素b的合成。20%和30%光照处理下的多毛金花茶叶片具有更发达的栅栏组织、海绵组织及更厚的叶片厚度,这两个处理下的叶片结构可能有利于其对环境的适应并且光合能力更强。在适当的遮荫条件20%-40%光照处理下,多毛金花茶的最大净光合速率增大。【结论】在20%、30%光照处理下,其叶片具有更发达的叶片厚度和栅栏组织,气孔密度相对较低,净光合速率、蒸腾速率得到提高,胞间CO2浓度和蒸汽压亏缺降低,CO2和水蒸气进出气孔阻力变小,同时在30%光照处理下光合色素的含量最高,说明光合速率得到有效提高。越南多毛金花茶适宜在20%-30%光照强度的环境下生长。
英文摘要:
      [Objective] In this study, Vietnam Camellia hirsute were used as experimental materials. Effect of different light treatments on the photosynthetic characteristics and anatomical structure of Camellia hirsute was studied to provide some scientific advices for introduction, cultivation and management of the species. [Method] Early May 2017,Vietnam C. hirsute grew in the shade sheds with different light intensity for two months. The following light intensity was obtained by covering the shading net of different layers: 10%, 20%, 30%, 40%, and 50% illumination intensity. [Result] The results showed that, the variation trend of the net photosynthetic rate of the different light treatments is different. 20% and 30% light intensity significantly improved net photosynthetic rate, transpiration rate and stomatal conductance of C. hirsute, while the vapor pressure deficit decreased (P?0.05). These results showed the photosynthetic function was promoted. The content of photosynthetic pigments of C. hirsute leaves were the highest in the 30% light treatment. Not only that, the total chlorophyll content was the highest, but chlorophyll a/b was the lowest, which was beneficial to the synthesis of chlorophyll b of C. hirsute leaves under the 30% light treatment. There were more developed palisade tissue, spongy tissue and thicker blade thickness in C. hirsute leaves under 20% and 30% light treatments, which promoted its adaptation to the environment and enhanced photosynthesis. Under the appropriate shade conditions (20%-40% light treatments), the maximum net photosynthetic rate of C. hirsute increased. [Conclusion] Under 20% and 30% light treatments, the blade had more developed palisade tissue and thicker leaf thickness, which stoma density was relatively low. And the net photosynthetic and transpiration rate of C. hirsute leaves were improved, on the contrary, the internal carbon dioxide concentration and vapor pressure deficit of C. hirsute were decreased, which led to the smaller resistance of CO2 and water vapor in and out of the stomata. At the same time, under 30% light treatment, the total chlorophyll content was the highest. It showed that the photosynthetic rate was improved effectively. It is concluded that C. hirsute is suitable for growing in the environment with 20%-30% light intensity.
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