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Photosynthetic regulation under fluctuating light in field-grown Cerasus cerasoides: A comparison of young and mature leaves.
Biochimica et Biophysica Acta (BBA) - Bioenergetics ( IF 4.3 ) Pub Date : 2019-08-29 , DOI: 10.1016/j.bbabio.2019.148073
Ying-Jie Yang 1 , Shi-Bao Zhang 2 , Ji-Hua Wang 3 , Wei Huang 2
Affiliation  

Photosystem I (PSI) is a potential target of photoinhibition under fluctuating light. However, photosynthetic regulation under fluctuating light in field-grown plants is little known. Furthermore, it is unclear how young leaves protect PSI against fluctuating light under natural field conditions. In the present study, we examined chlorophyll fluorescence, P700 redox state and the electrochromic shift signal in the young and mature leaves of field-grown Cerasus cerasoides (Rosaceae). Within the first seconds after any increase in light intensity, young leaves showed higher proton gradient (ΔpH) across the thylakoid membranes than the mature leaves, preventing over-reduction of PSI in the young leaves. As a result, PSI was more tolerant to fluctuating light in the young leaves than in the mature leaves. Interestingly, after transition from low to high light, the activity of cyclic electron flow (CEF) in young leaves increased first to a high level and then decreased to a stable value, while this rapid stimulation of CEF was not observed in the mature leaves. Furthermore, the over-reduction of PSI significantly stimulated CEF in the young leaves but not in the mature leaves. Taken together, within the first seconds after any increase in illumination, the stimulation of CEF favors the rapid lumen acidification and optimizes the PSI redox state in the young leaves, protecting PSI against photoinhibition under fluctuating light in field-grown plants.

中文翻译:

田间生长的黑斑蛙的光合作用调节下的光合作用:幼叶和成熟叶的比较。

光系统I(PSI)是波动光下光抑制的潜在目标。然而,在田间生长的植物中,在波动的光下进行光合作用的调控鲜为人知。此外,还不清楚在自然田间条件下,幼叶如何保护PSI免受光线波动的影响。在本研究中,我们研究了田间生长的Cerasus cerasoides(蔷薇科)的年轻和成熟叶片中的叶绿素荧光,P700氧化还原状态和电致变色信号。在光强度增加后的最初几秒钟内,幼叶在类囊体膜上的质子梯度(ΔpH)高于成熟叶,从而防止了幼叶中PSI的过度降低。结果,与成熟叶片相比,PSI对幼叶的光波动耐受性更高。有趣的是,从弱光过渡到强光后,幼叶中循环电子流(CEF)的活性先增加到高水平,然后下降到稳定值,而在成熟叶中未观察到这种CEF的快速刺激。此外,PSI的过度降低显着刺激了幼叶中的CEF,但没有刺激成熟叶中的CEF。两者合计,在光照增加后的最初几秒钟内,CEF的刺激有利于快速管腔酸化并优化幼叶中的PSI氧化还原状态,从而保护PSI在田间生长的植物中不受光变的光抑制。此外,PSI的过度降低显着刺激了幼叶中的CEF,但没有刺激成熟叶中的CEF。两者合计,在光照增加后的最初几秒钟内,CEF的刺激有利于快速管腔酸化并优化幼叶中的PSI氧化还原状态,从而保护PSI在田间生长的植物中不受光变的光抑制。此外,PSI的过度降低显着刺激了幼叶中的CEF,但没有刺激成熟叶中的CEF。两者合计,在光照增加后的最初几秒钟内,CEF的刺激有利于快速管腔酸化并优化幼叶中的PSI氧化还原状态,从而保护PSI在田间生长的植物中不受光变的光抑制。
更新日期:2019-08-29
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