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|本期目录/Table of Contents|

NaCl胁迫对互花米草细胞膜和光响应曲线特征参数的影响

《广西植物》[ISSN:1000-3142/CN:45-1134/Q]

期数:
2012年01期
页码:
101
栏目:
植物生理学与分子生物学
出版日期:
2012-01-25

文章信息/Info

Title:
Response of cell membrane and lightresponse curve parameters of Spartina anglica to NaCl stress
作者:
石贵玉12 康浩1 宜丽娜1 李明霞1
1.广西师范大学 生命科学学院, 广西 桂林 541004; 2.珍稀濒危动植物生态与环境保护省部共建教育部重点实验室, 广西 桂林 541004
Author(s):
SHI GuiYu12 KANG Hao1 YI LiNa1 LI MingXia1
1.College of Life Sciences, Guangxi Normal University, Guilin 541004, China; 2.Key Laboratory of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China
关键词:
互花米草 膜透性 MDA 光响应曲线 参数
Keywords:
Spartina anglica membrane permeability malondialdehyde lightresponse curve parameters
分类号:
Q948
DOI:
-
文献标识码:
A
摘要:
以大米草的互花米草为材料,研究了不同盐浓度对其细胞膜透性、丙二醛(MDA)含量和光响应曲线的特征参数的变化情况。结果表明:盐浓度低于300 mmol?L1时,互花米草细胞膜透性和MDA含量较对照组无显著差异;其较高的最大光合速率(>30 μmol?m2?s1),表观量子效率(>0.05 mol?mol1Photons)以及较低的暗呼吸速率(<1.5 μmol CO2?m2?s1)和光补偿点(<20 μmol?m2?s1)为其有机物质积累、竞争、建立种群并扩散提供条件。盐浓度高于500 mmol?L1时,互花米草膜透性和MDA含量显著上升,最大光合速率(Amax)及表观量子效率(Q)显著下降,暗呼吸速率(Rday)和光补偿点(LCP)上升。表明细胞膜和光合作用有关酶受到迫害,抑制了其正常生长。盐胁迫下互花米草光合速率降低,但蒸腾速率的显著下降提高了单叶水分利用效率,从而部分缓解了渗透势变化对细胞的迫害,为其生存和生长提供条件。
Abstract:
This research covers the study of lightresponse curve parameters,membrane permeability and malondialdehyde contents of Spartina anglica in NaCl salt stress. The results indicated that there was no significant change in membrane permeability or malondialdehyde contents at the salt concentrations no higher than 300 mmol?L1. In the same condition,the relative high Amax(>30 μmol?m2?s1),high apparent quantum yield(>0.05 mol?mol1Photons),relative low dark respiration rate(<1.5 μmol CO2?m2?s1) as well as light compensation point(<20 μmol?m2?s1) could be prerequisites for organic matter accumulation,competition,establishing populations and pervasion. However,at the salt concentration higher than 500 mmol?L1,the member permeability and malondialdehyde contents increased obviously,Amaxand apparent quantum yield decreased significantly, and dark respiration rate and light compensation point increased slightly. All these changes showed that cell membrane and enzyme of photosynthesis of S.anglica was damaged,so their growth was inhibited. In addition,relative lower photosynthetic rate and significantly lower transpiration rate of S.anglica under salt stress provided the conditions for their existence and growth by higher water use effective and remission of persecution of osmotic potential to cell membrane.

参考文献/References

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2012-01-25