Chlorophyll fluorescence (CF) parameters, plant growth, and chlorophyll and proline content were investigated in the seedlings of four tomato ( Solanum lycopersicum L.) cultivars (‘Dafnis’, ‘Maxifort’, ‘BKO’, and ‘B-blocking’) exposed to 0, 50, 100, 150, 200, 300, and 400 mM NaCl concentrations for 15 days. The maximum quantum yield (Fv/Fm) showed progressively decreased at 300 and 400 mM salt concentrations in all the cultivars, with the highest decrement in Dafnis. In contrast, the quantum yield of nonregulated energy dissipation in photosystem II (PSII) [Y(NO)] showed a reverse accumulation pattern at higher salt concentrations as the treatment time increased, regardless of the genotype. Other CF parameters, such as the coefficient of nonphotochemical quenching, excitation transfer efficiency from antenna pigments to the reaction center of PSII in the light-adapted state, effective quantum yield of photochemical energy conversion in PSII, nonphotochemical quenching, and the ratio of chlorophyll fluorescence decrease were lower at higher salt concentrations; however, some inconsistencies were observed at 5 and 10 days after the treatment time depending upon the cultivar and salt concentration. Growth parameters such as plant height, stem diameter, number of nodes, and shoot fresh and dry weight decreased by about 2.2–3.2, 1.1–1.6, 1.7–2.0, 3.1–6.8, and 1.8–3.2 times, respectively, in the salt-stressed cultivars. In the seedlings, the proline content significantly increased, with the highest increment observed in the seedlings treated with 100–200 mM salt concentration. Both chlorophyll a and b decreased as the salt concentration increased. Among the four cultivars, Dafnis showed the highest response to the salt concentrations with respect to all the parameters. In conclusion, our results suggest that the CF parameters Fv/Fm and Y(NO) can be used as indices for screening tomato genotypes with salt tolerance.

中文翻译：

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不同盐胁迫条件下番茄幼苗叶绿素荧光参数和脯氨酸含量评价

研究了四种番茄 (Solanum lycopersicum L.) 品种 ('Dafnis'、'Maxifort'、'BKO' 和 'B-blocking') 的幼苗中的叶绿素荧光 (CF) 参数、植物生长以及叶绿素和脯氨酸含量暴露于 0、50、100、150、200、300 和 400 mM NaCl 浓度 15 天。在所有品种中，最大量子产率 (Fv/Fm) 在 300 和 400 mM 盐浓度下逐渐下降，Dafnis 的下降幅度最大。相比之下，光系统 II (PSII) [Y(NO)] 中非调节能量耗散的量子产率随着处理时间的增加，在较高盐浓度下显示出反向积累模式，无论基因型如何。其他 CF 参数，如非光化学淬灭系数，在光适应状态下，从天线色素到 PSII 反应中心的激发转移效率、PSII 光化学能量转换的有效量子产率、非光化学猝灭和叶绿素荧光降低的比率在较高盐浓度下较低；然而，根据栽培品种和盐浓度，在处理时间后 5 天和 10 天观察到一些不一致。生长参数，如株高、茎粗、节数、地上部鲜重和干重分别下降约 2.2-3.2、1.1-1.6、1.7-2.0、3.1-6.8 和 1.8-3.2 倍。 - 强调栽培品种。在幼苗中，脯氨酸含量显着增加，在用 100-200 mM 盐浓度处理的幼苗中观察到的增量最高。随着盐浓度的增加，叶绿素 a 和 b 均下降。在四个品种中，Dafnis 在所有参数方面对盐浓度的响应最高。总之，我们的结果表明CF参数Fv/Fm和Y(NO)可用作筛选具有耐盐性的番茄基因型的指标。