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Fluorescence emission and photochemical yield of parsley under saline waters of different cationic nature
Scientia Horticulturae ( IF 4.3 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.scienta.2020.109574
Juliana Bezerra Martins , José Amilton Santos Júnior , Lucas Yago de Carvalho Leal , Martha Katharinne Silva Souza Paulino , Edivan Rodrigues de Souza , Hans Raj Gheyi

Abstract Chlorophyll fluorescence is a non-destructive analysis tool to diagnose the effects of salinity on the photosynthetic apparatus and photochemical yield. The present study aimed to evaluate the photochemical yield of parsley plants, exposed to increasing levels of electrical conductivity of nutrient solutions (1.7; 2.7; 3.7; 4.7; 5.7 and 6.7 dS m−1) formulated in waters with NaCl, CaCl2, MgCl2 and KCl. The mode of water replenishment in hydroponic system was also evaluated. For this, two experiments were conducted, maintaining the same experimental configuration, and varying the water replenishment. The nutrient solution, whose volume decreases with the consumption by plants, was replenished using a public-supply water (Experiment I) and the respective saline water used to prepare the nutrient solution (Experiment II). The following parameters were evaluated: initial (Fo), maximum (Fm) and variable (Fv) fluorescence; quantum (Fv/Fm) and maximum (Fo/Fm) yield of photosystem II; and also the quantum yield of electron transport (φEo), flux absorption (ABS/RC), flux transport (ETo/RC) and dissipated energy (DIo/RC) per reaction center for the two experiments. It was concluded that replenishment with public-supply water causes less damage to chlorophyll variables and quantum yields as the nutrient solution electrical conductivity increases than replenishment with saline water, whereas on variables related to electron transfer, such effect was not noticeable. Plants cultivated under NaCl had higher tolerance to salt stress compared to other cations.

中文翻译:

不同阳离子性质咸水下香菜的荧光发射和光化学产率

摘要 叶绿素荧光是诊断盐度对光合装置和光化学产量影响的无损分析工具。本研究旨在评估欧芹植物的光化学产量,暴露于不断增加的营养液(1.7;2.7;3.7;4.7;5.7 和 6.7 dS m-1)在含有 NaCl、CaCl2、MgCl2 和氯化钾。还评估了水培系统中的补水方式。为此,进行了两个实验,保持相同的实验配置,并改变补水。营养液随着植物的消耗而体积减少,使用公共供水(实验I)和用于制备营养液的相应盐水(实验II)补充。评估了以下参数:初始 (Fo)、最大 (Fm) 和可变 (Fv) 荧光;光系统 II 的量子 (Fv/Fm) 和最大 (Fo/Fm) 产率;以及两个实验的每个反应中心的电子传输量子产率 (φEo)、通量吸收 (ABS/RC)、通量传输 (ETo/RC) 和耗散能量 (DIo/RC)。结论是,与补充盐水相比,补充公共供水对叶绿素变量和量子产率的损害较小,因为营养液电导率增加,而在与电子转移相关的变量上,这种影响不明显。与其他阳离子相比,NaCl 培养的植物对盐胁迫的耐受性更高。光系统 II 的量子 (Fv/Fm) 和最大 (Fo/Fm) 产率;以及两个实验的每个反应中心的电子传输量子产率 (φEo)、通量吸收 (ABS/RC)、通量传输 (ETo/RC) 和耗散能量 (DIo/RC)。结论是,与补充盐水相比,补充公共供水对叶绿素变量和量子产率的损害较小,因为营养液电导率增加,而在与电子转移相关的变量上,这种影响不明显。与其他阳离子相比,NaCl 培养的植物对盐胁迫的耐受性更高。光系统 II 的量子 (Fv/Fm) 和最大 (Fo/Fm) 产率;以及两个实验的每个反应中心的电子传输量子产率 (φEo)、通量吸收 (ABS/RC)、通量传输 (ETo/RC) 和耗散能量 (DIo/RC)。结论是,与补充盐水相比,补充公共供水对叶绿素变量和量子产率的损害较小,因为营养液电导率增加,而在与电子转移相关的变量上,这种影响不明显。与其他阳离子相比,NaCl 培养的植物对盐胁迫的耐受性更高。结论是,与补充盐水相比,补充公共供水对叶绿素变量和量子产率的损害较小,因为营养液电导率增加,而在与电子转移相关的变量上,这种影响不明显。与其他阳离子相比,NaCl 培养的植物对盐胁迫具有更高的耐受性。结论是,与补充盐水相比,补充公共供水对叶绿素变量和量子产率的损害较小,因为营养液电导率增加,而在与电子转移相关的变量上,这种影响不明显。与其他阳离子相比,NaCl 培养的植物对盐胁迫具有更高的耐受性。
更新日期:2020-11-01
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