首页> 美国卫生研究院文献>Wiley-Blackwell Online Open >Enhanced chloroplastic generation of H2O2 in stress-resistant Thellungiella salsuginea in comparison to Arabidopsis thaliana
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Enhanced chloroplastic generation of H2O2 in stress-resistant Thellungiella salsuginea in comparison to Arabidopsis thaliana

机译:与拟南芥相比耐胁迫的盐芥中增强了H2O2的叶绿体生成

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摘要

In order to find some basis of salinity resistance in the chloroplastic metabolism, a halophytic Thellungiella salsuginea was compared with glycophytic Arabidopsis thaliana. In control T.s. plants the increased ratios of chlorophyll a/b and of fluorescence emission at 77 K (F730/F685) were documented, in comparison to A.t.. This was accompanied by a higher YII and lower NPQ (non-photochemical quenching) values, and by a more active PSI (photosystem I). Another prominent feature of the photosynthetic electron transport (PET) in T.s. was the intensive production of H2O2 from PQ (plastoquinone) pool. Salinity treatment (0.15 and 0.30 M NaCl for A.t. and T.s., respectively) led to a decrease in ratios of chl a/b and F730/F685. In A.t., a salinity-driven enhancement of YII and NPQ was found, in association with the stimulation of H2O2 production from PQ pool. In contrast, in salinity-treated T.s., these variables were similar as in controls. The intensive H2O2 generation was accompanied by a high activity of PTOX (plastid terminal oxidase), whilst inhibition of this enzyme led to an increased H2O2 formation. It is hypothesized, that the intensive H2O2 generation from PQ pool might be an important element of stress preparedness in Thellungiella plants. In control T.s. plants, a higher activation state of carboxylase ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco, EC 4.1.1.39) was also documented in concert with the attachment of Rubisco activase (RCA) to the thylakoid membranes. It is supposed, that a closer contact of RCA with PSI in T.s. enables a more efficient Rubisco activation than in A.t.
机译:为了在叶绿体代谢中找到耐盐性的基础,将盐生的盐芥和甜菜的拟​​南芥进行了比较。在控制中与At相比,植物在77 K(F730 / F685)处的叶绿素a / b比率和荧光发射率都有提高。这伴随着更高的YII和更低的NPQ(非光化学猝灭)值,以及主动PSI(光电系统I)。 T.s.光合作用电子传输(PET)的另一个突出特征是从PQ(质体醌)库中大量生产H2O2的过程。盐度处理(A.t.和T.s.分别为0.15和0.30 M NaCl)导致chl a / b和F730 / F685的比率降低。在A.t.,发现了盐分驱动的YII和NPQ的增强,与PQ库中H2O2产生的刺激有关。相反,在盐度处理的T.s.中,这些变量与对照中的相似。 H2O2的大量产生伴随着PTOX(质体末端氧化酶)的高活性,而对该酶的抑制导致H2O2形成增加。据推测,PQ库中大量生成的H2O2可能是Thellungiella植物应对压力的重要因素。在控制中在植物中,与Rubisco活化酶(RCA)附着在类囊体膜上的协同作用还证明了羧化酶核糖-1,5-双磷酸羧化酶/加氧酶的较高活化状态(Rubisco,EC 4.1.1.39)。据推测,与 A.t。中的Rem与 T.s。中的PSI紧密接触可以实现更有效的Rubisco激活。

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