摘要: |
为了解在天然更新条件下三种不同生境的红鳞蒲桃幼苗对环境因子的适应性,该文以广西滨海地区天然更新的当年生红鳞蒲桃幼苗为研究对象,对其叶片和根系的抗氧化酶活性、可溶性糖含量、丙二醛含量以及叶片的光合色素进行测定。结果表明:(1)对环境因子进行方差分析表明:三样地间的光照强度差异极显著,地表温度和土壤含水率差异不显著。(2)不同生境下幼苗叶片与根系的生理特征随着光照强度而变化。随着光照强度的增加,幼苗叶片的超氧化物歧化酶(SOD)活性、可溶性糖(SS)含量、丙二醛(MDA)含量、叶绿素a/b含量以及根系的过氧化物酶(POD)活性生境B显著高于生境A;而叶片的POD活性、叶绿素a含量、叶绿素b含量、总叶绿素含量以及根系的SOD活性、SS含量、MDA含量生境A显著高于生境B。(3)随着光照强度的减少,幼苗叶片的SOD活性、MDA含量以及根系的POD活性生境B显著高于生境A;而叶片的POD活性、SS含量生境A显著高于生境B;叶绿素a含量、叶绿素b含量、总叶绿素含量以及根系的SS含量、MDA含量先是生境A显著高于生境B随后变化成生境B显著高于生境A;叶绿素a/b含量以及根系的SOD活性先是生境B显著高于生境A随后变化成生境A显著高于生境B。(4)综合分析表明:三种生境的生理生化特征均表现出不同的适应性,其中郁闭度最小的生境B发生了光抑制现象,因此需要人工调整郁闭度来创造适宜的光照环境,为幼苗的天然更新提供条件。 |
关键词: 红鳞蒲桃,抗氧化酶,渗透调节,光合色素,适应性 |
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Fund project:国家自然科学基金项目(面上项目,重点项目,重大项目) |
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Ecological adaptation of Syzygium hancei seedlings in Guangxi under different habitats |
Zhaolijun, Zhuliqiong, Moruoguo, Wangyanling
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Forestry College,Guangxi University
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Abstract: |
In order to understand the adaptation ability of Syzygium hancei seedlings to environmental factors in three different habitats under natural regeneration conditions. The present study collected the current year’s Syzygium hancei seedlings as experimental materials that regenerated in naturally coastal environments of Guangxi, and then antioxidant enzyme activities, soluble sugar content, malondialdehyde content and photosynthetic pigments in leaves and roots were analysed. The results were as follows:(1)Variance analysis (ANOVA) was conducted on multiple environmental factors, which indicated light intensity was highly significant differences, soil surface temperature and water content were not significant differences between the three sample plots. (2)Various light density resulted in the changes of leaves and roots physiological characteristics of seedlings in different habitats. With the light density increasing, leaves’ superoxide dismutase (SOD) activity, soluble sugar (SS), malondialdehyde (MDA), and chlorophyll a/b contents, and roots’ peroxidase (POD) activity of seedlings were significantly higher in habitat B than in habitat A; while leaves’ POD activity, chlorophyll a , chlorophyll b and total chlorophyll contents, and roots’ SOD activity, SS and MDA contents were higher in habitat A than in habitat B. (3)With light intensity decreasing, seedlings that regenerated in habitat B represented significantly higher SOD activity and MDA content in leaves, and POD activity in roots than regenerated in habitat A; however, these seedlings that regenerated in habitat A represented significantly higher POD activity and SS content in leaves compare with regenerated inhabitat B; chlorophyll a , chlorophyll b, total chlorophyll,and SS contents, and roots’ MDA content were significantly higher in habitat A than in habitat B firstly, and then changed to Habitat B being significantly higher than Habitat A; chlorophyll a/b content and roots’ SOD activity were significantly higher in habitat A firstly and then changed to habitat A being significantly higher than Habitat B. (4)Comprehensive analyses show that:the physiological and biochemicalcharacteristics of all three habitats show different adaptation abilities, in the meanwhile, photoinhibition occurr in habitat B that is with the lowest canopy density, hence, some manual adjusting practices are need to create a moderate light environment, and provide a suitable condition for promoting the natural regeneration of seedlings. |
Key words: Syzygium hancei,Antioxidant enzymes, osmoregulation, photosynthetic pigments,adaptability |