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氯化钠胁迫对香樟幼苗光合色素和叶绿素荧光参数的影响
王金平,张金池,岳健敏,傅致远,印荣华,陈义高
0
(南京林业大学林学院,南方现代林业协同创新中心,南京 210037;大丰林场,盐城 224100)
摘要:
通过研究氯化钠胁迫下香樟(Cinnamomum camphora)幼苗叶片光合色素和叶绿素荧光参数的变化规律,为香樟耐盐性的研究以及沿海地区的引种栽培提供理论依据。以温室大棚中培育的实生香樟幼苗为实验材料,设置2‰、6‰ 2种盐梯度(质量浓度),清水为对照(CK),通过测定苗高相对生长量、基径相对生长量以及受胁迫后第7天(初期)、第39天(前期)、第76天(中期)、第120天(后期)幼苗叶片相对含水量、光合色素和荧光参数,研究盐胁迫对香樟光合机构的影响。结果表明,香樟幼苗受胁迫程度随着胁迫时间的延长而加深;6‰的盐浓度能显著抑制香樟生长,严重损害其光合机构;2‰的盐浓度胁迫下,香樟的生长量和光合功能并未受显著影响,胁迫后期,香樟可能由于气温显著降低而进入冬季休眠,耐盐性降低,2‰的盐浓度也影响了其光合机构功能,而此时CK光合功能也有所下降,但仍明显高于2‰的盐浓度处理。
关键词:  香樟  氯化钠胁迫  光合色素  荧光参数
DOI:10.13610/j.cnki.1672-352x.20170811.023
基金项目:江苏省科学技术计划项目(BE2012344), 林业公益性行业科研专项(201504406), 江苏省高校自然科学研究重大项目(15KJA220004)和江苏高校优势学科建设工程项目(PAPD)共同资助。
Effects of salt stress on photosynthetic pigments and chlorophyll fluorescence parameters of camphor seedlings
WANG Jinping,ZHANG Jinchi,YUE Jianmin,FU Zhiyuan,YIN Ronghua,CHEN Gaoyi
(Collaborative Innovation Center of Sustainable Forestry in Southern China, The Forestry College of Nanjing Forestry University, Nanjing 210037;Dafeng Forest Farm,Yancheng 224100)
Abstract:
To provide a theoretical basis for the salt stress research and the introduction to the coastal area of Jiangsu Province for Cinnamomum camphora, the change of leaf photosynthetic pigments and chlorophyll fluorescence parameters of camphor seedlings under NaCl stress in different times was studied. Camphor seedlings cultivated in the greenhouse were treated with 2‰ and 6‰ (mass concentration) NaCl, and water as the control. On the 7th day(?initial stage), the 39th day(earlier stage?), the 76th day(medium term)and the 120th day(late period)after NaCl treatment,the relative high growth and relative base diameter growth before and after the experiment, leaf relative water content, photosynthetic pigment and fluorescence parameters were measured. Results showed that the damage degree became greater with the increase of salt-stress time; the photosynthetic apparatus was damaged severely and the growth of camphor was inhibited obviously under the salt stress of 6‰, but it did not be affected significantly under the salt stress of 2‰; however, in the late period, the ability of salt tolerance of camphor decreased, and the salt stress of 2‰ could also affect its photosynthetic function. Although the photosynthesis of CK also decreased at that time, but it was still stronger than that of the 2‰ salt treatment, which was probably caused by the dormancy due to a significant decrease of temperature.
Key words:  Cinnamomum camphora  NaCl stress  photosynthetic pigment  chlorophyll fluorescence parameters

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