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生态学杂志 ›› 2012, Vol. 31 ›› Issue (06): 1347-1352.

• 研究报告 • 上一篇    下一篇

盐胁迫对不同品系杨树幼苗生长和叶绿素荧光的效应

武传兰,隆小华,金善钊,刘玲,王长海,刘兆普**   

  1. (南京农业大学资源与环境科学学院江苏省海洋生物学重点实验室, 南京 210095)
  • 出版日期:2012-06-09 发布日期:2012-06-09

Effects of NaCl stress on the growth and chlorophyll fluorescence characteristics of poplar seedlings.

WU Chuan-lan, LONG Xiao-hua, JIN Shan-zhao, LIU Lin, WANG Chang-hai, LIU Zhao-pu**   

  1. (Jiangsu Provincial Key Laboratory of Marine Biology, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
  • Online:2012-06-09 Published:2012-06-09

摘要: 为探讨杨树耐盐性,以本实验室育成的杨树新品系南杨1号和南杨2号为材料,研究了不同浓度NaCl对南杨1号和南杨2号植株干重、水势、叶绿素含量、叶绿素荧光参数和光能分配的影响。结果表明:低盐(75 mmol·L-1 NaCl)胁迫对南杨1号干重、叶绿素含量、光化学淬灭系数(qP)、PSⅡ的实际光量子产量(Yield)和光合电子传递速率(ETR)的抑制作用显著要高于南杨2号,南杨1号水势的下降幅度高于南杨2号,而光系统Ⅱ最大光化学效率(Fm/Fv)和光系统Ⅱ有效光化学量子产量(Fm′/Fv′)变化不明显。高盐(150 mmol·L-1 NaCl)胁迫对2个品系的抑制作用差异不显著。盐处理条件下,南杨2号光化学反应的部分(Pc)平均值比南杨1号高,天线热耗散的能量(Hd)所占比例低于南杨1号,南杨1号和南杨2号反应中心由非光化学反应耗散的能量(Ex)平均值比较接近。表明盐胁迫下,南杨2号光系统Ⅱ维持较高的活性是其耐盐性高于南杨1号的重要原因之一。

关键词: 茶园土壤, 植茶年限, pH缓冲容量

Abstract: In order to understand the salt-tolerance of poplar, the seedlings of poplar cultivars Nanyang No. 1 and Nanyang
No. 2 bred by the Jiangsu Provincial Key Laboratory of Marine Biology were taken as the test materials to study their dry weight, water potential, chlorophyll content, chlorophyll fluorescence parameters, and light energy absorption and distribution under the stress of different concentrations NaCl. At low concentration (75 mmol·L-1) NaCl, the plant dry weight, chlorophyll content, qP, Yield, and ETR of Nanyang No. 1 were significantly lower than those of Nanyang No. 2. The decrement of the water potential of Nanyang No. 1 was higher than that of Nanyang No. 2, while the Fm/Fv and Fm′/Fv′ of the two cultivars had less change. At high concentration (150 mmol·L-1) NaCl, there were no significant differences in the inhibitory effects of salt stress on Nanyang No. 1 and Nanyang No. 2. Under salt stress, Nanyang No. 2 had higher average value of Pc but lower proportion of Hd than Nanyang No. 1, while the average value of Ex of the two cultivars had little difference. Above all, due to the higher activity of photosystem Ⅱ, Nanyang No.2 had higher salt-tolerance than Nanyang No. 1.

Key words: tea garden soil, planting years, pH buffer capacity.