作物学报 ›› 2013, Vol. 39 ›› Issue (11): 2023-2029.doi: 10.3724/SP.J.1006.2013.02023
张会慧1,田褀1,刘关君2,胡彦波1,吴翔宇2,田野1,李鑫1,孙广玉1,*
ZHANG Hui-Hui1,TIAN Qi1,LIU Guan-Jun2,HU Yan-Bo1,WU Xiang-Yu2,TIANA Ye1,LI Xin1,SUN Guang-Yu1,*
摘要:
以转2-Cys Peroxiredoxins (2-Cys Prx)基因的烟草(Nicotiana tabacum)为材料,非转基因烟草为对照,调查盐和光胁迫对转基因烟草幼苗叶片抗氧化酶和叶绿素荧光特性的影响,揭示2-Cys Prx基因在植物抗逆方面的功能。结果表明,弱光(200 μmol m–2 s–1)下,随着盐浓度增大,转基因烟草和对照的SOD活性皆增加,APX活性变化不大,H2O2含量稍有升高;强光(1000 μmol m–2 s–1)下,随着盐浓度增大,转基因烟草SOD活性增强,APX活性下降,H2O2含量增加缓慢,而对照的H2O2含量迅速升高,转基因烟草叶片的PSII电子传递速率(ETR)、最大光化学效率(Fv/Fm)和实际光化学效率(ФPSII)均高于对照,而且PSII电子受体侧的受抑制程度明显低于对照。结果暗示在强光和盐胁迫使APX活性降低的情况下,2-Cys Prx可有效清除细胞中过量H2O2,增强光合电子传递链的稳定性,特别是PSII电子受体侧的电子传递,有效减轻盐和高光胁迫引起的PSII光抑制。
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