摘要
研究盐胁迫对3种园林植物幼苗叶绿素荧光参数的影响,探索其适应盐胁迫的机制,以便为滨海沙地园林植物筛选提供参考。用Na Cl溶液对狗牙花、红背桂和鹅掌藤幼苗进行盐分梯度设置,测定幼苗的叶绿素含量,并采用脉冲调制荧光仪OS-1P调制荧光仪测定了室温下荧光动力学参数。结果表明,随着盐胁迫时间的延长,0.3%盐浓度胁迫的3种幼苗和0.6%盐浓度胁迫的红背桂幼苗的叶绿素含量递增,而0.6%盐浓度胁迫下,狗牙花和鹅掌藤幼苗的叶绿素含量先升后降;0.3%和0.6%盐浓度胁迫下,狗牙花幼苗叶片的初始荧光(Fo)持续上升,红背桂和鹅掌藤的Fo先升后降。0.3%盐浓度胁迫的狗牙花和鹅掌藤幼苗叶片及0.6%盐浓度胁迫下3种幼苗叶片的PSⅡ最大光化学效率(Fv/Fm)和非光化学淬灭(NPQ)不断下降,0.3%盐浓度胁迫下红背桂先降后升;0.3%和0.6%盐浓度胁迫的3种幼苗叶片的实际光化学量子效率(Y(II))和光合电子传递速率(ETR)不断下降。盐胁迫下狗牙花的各荧光指标降幅最大,表明其抗盐胁迫能力弱。0.3%盐胁迫的红背桂的Fv/Fm和NPQ先降后升,说明该植物有抗轻度盐胁迫能力,更适于在滨海沙地栽培。
The impacts of salt stress on the chlorophyll fluorescence parameters of garden seedlings of three species were studied and their physiological adaptation mechanisms of salt stress were elucidated, so as to provide reference for garden plant selection under salt stress. The seedlings of Ervatamia divaricata, Excoecaria cochinchinensis Lour., Schefflera arboricola were placed in different simulating salt environment with Na Cl to determine their chlorophyll content and fluorescence indexes. The results showed that with increasing salt stress time, chlorophyll content of seedlings of the three species at 0.3% salt concentration and E. cochinchinensis at 0.6% salt concentration continuously increased, whereas that of E. divaricata and S. arboricola at 0.6% salt concentration increased followed by a decrease; Fo of E. divaricata continuously increased, whereas that of E. cochinchinensis and S. arboricola increased followed by a decrease at 0.3% and 0.6% salt concentration; Fv/Fm and NPQ of E. divaricata and S. arboricola at 0.3% salt concentration and seedlings of the three species at 0.6% salt concentration continuously decreased, whereas those of E. cochinchinensis decreased and then increased at 0.3% salt concentration; Y（II） and ERT of seedlings of the three species continuously decreased. Under salt stress, decrease range in all chlorophyll fluorescence parameters of E.divaricata was the greatest among the three species, indicated that its salt resistance was poor. The Fv/Fm and NPQ of E. cochinchinensis decreased followed by an increase, therefore this specie has stronger salt tolerance and is more suitable for cultivation in coastal sandy soil.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2017年第8期54-59,共6页
Journal of Central South University of Forestry & Technology
基金
广州市科信局项目"广州市生态园林技术研究企业重点实验室"(2014SY000010)
中央财政林业科技推广示范项目"广东省生态公益林培育技术推广"(2015-GDTK-07)
关键词
园林植株
盐胁迫
荧光指标
幼苗
garden plant
salt stress
fluorescence index
seedling
