首页> 外文期刊>Frontiers in Plant Science >Contrasting photosynthesis and photoinhibition in tetraploid and its autodiploid honeysuckle ( Lonicera japonica Thunb.) under salt stress
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Contrasting photosynthesis and photoinhibition in tetraploid and its autodiploid honeysuckle ( Lonicera japonica Thunb.) under salt stress

机译:盐胁迫下四倍体及其自二倍体金银花( Lonicera japonica Thunb。)的光合作用和光抑制作用相反

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Honeysuckle ( Lonicera japonica Thunb.) is a popular landscape plant. This study was to explore leaf photosynthetic characterization with emphasis on the coordination between photosystem II (PSII) and photosystem I (PSI) in tetraploid and its autodiploid honeysuckle (TH and DH) upon salt stress (300 mM NaCl). Leaf photosynthetic rate and carboxylation efficiency in DH and TH were significantly decreased under salt stress, and the decrease was greater in DH. PSII photoinhibition was induced in DH under salt stress, as the maximum quantum yield of PSII (Fv/Fm) was significantly decreased. PSII photoinhibition declined electron flow to PSI, but did not prevent PSI photoinhibition, as the maximal photochemical capacity of PSI (MR/MR_(0)) was significantly decreased by salt stress. According to the significant decrease in PSI oxidation amplitude in the first 1 s red illumination, PSI photoinhibition was more severe than PSII photoinhibition. As a result, PSII and PSI coordination was destroyed. Comparatively, salt-induced photoinhibition did not occur in TH, as no significant change was observed in Fv/Fm and MR/MR_(0). Consequently, PSII and PSI coordination was not significantly affected by salt stress. In conclusion, TH maintained normal coordination between PSII and PSI by preventing photoinhibition and exhibited higher leaf photosynthetic activity than DH under salt stress. Compared with DH, lower leaf ionic toxicity due to greater root Na~(+)extrusion and restriction of Na~(+)transport to leaf might be responsible for maintaining higher leaf photosynthetic capacity in TH under salt stress.
机译:金银花(忍冬)是一种流行的园林植物。这项研究旨在探索叶片的光合特性,重点是盐胁迫(300 mM NaCl)下四倍体中的光系统II(PSII)和光系统I(PSI)及其自二倍体金银花(TH和DH)之间的配位。在盐胁迫下,DH和TH的叶片光合速率和羧化效率显着降低,而DH的降低幅度更大。在盐胁迫下,DH诱导了PSII的光抑制作用,因为PSII的最大量子产率(Fv / Fm)明显降低。 PSII光抑制作用降低了电子流向PSI的能力,但没有阻止PSI光抑制作用,因为盐胁迫显着降低了PSI的最大光化学容量(MR / MR_(0))。根据在最初的1 s红色照明中PSI氧化幅度的显着降低,PSI光抑制比PSII光抑制更严重。结果,破坏了PSII和PSI的协调。相比之下,盐诱导的光抑制在TH中没有发生,因为在Fv / Fm和MR / MR_(0)中未观察到显着变化。因此,盐胁迫对PSII和PSI的协调作用没有显着影响。总之,在盐胁迫下,TH通过防止光抑制作用维持PSII和PSI之间的正常配位,并显示出比DH高的叶片光合作用活性。与DH相比,由于盐胁迫下根系Na〜(+)的大量挤压和Na〜(+)向叶片的转运受到限制,叶片的离子毒性降低,这可能是维持TH较高的叶片光合能力的原因。

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