Wang Ping, Xu Wenjing, Zhang Zehao, Fu Zhanyong, Li Tian, Sun Jingkuan
Shandong Key Laboratory of Eco-Environmental Science for Yellow River Delta, Shandong University of Aeronautics, Binzhou, China.
Front Plant Sci. 2024 Oct 15;15:1471742. doi: 10.3389/fpls.2024.1471742. eCollection 2024.
Water and salt conditions are key factors influencing vegetation growth on shell island in the Yellow River Delta. However, the effects of the depth of underground brine on the photosynthetic characteristics and antioxidant system of halophytes remain unclear.
The laboratory simulation experiment was carried out to investigate the effect of the changes of underground brine depth on using four levels of groundwater: 0 cm, 15 cm, 30 cm and 45 cm.
The results showed that different underground brine depths had significant impacts on the photosynthetic characteristics and antioxidant system of , and 0-30 cm underground brine depth was suitable for growth. The net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), light utilization efficiency (LUE) and carboxylation efficiency (CE) of increased first and then decreased with increasing depth of underground brine. The stomatal limitation value (Ls) and WUE of reached the peak value at the groundwater depth of 0 cm, and water use efficiency was reduced by 19.4%, 8.0% and 8.6% at 15 cm, 30 cm, and 45 cm, respectively, compared to the 0 cm treatment. With the deepening of underground brine depth, the value of LUE and CE firstly increased and then decreased, and reached the peak value when the depth was 30 cm. The antioxidant enzyme (SOD, POD and CAT) activities of decreased and then increased with the increase of underground brine depth. The enzyme activities were the lowest when the underground brine depth was 30 cm. As the groundwater depth increased, MDA content decreased and then increased. The highest degree of membrane peroxidation in leaves was observed at the depth of 45 cm.
Our study reveals that the antioxidant capacity of was weakened at the underground brine depth of 45 cm and the growth of was inhibited.
水盐条件是影响黄河三角洲贝壳岛植被生长的关键因素。然而，地下卤水深度对盐生植物光合特性和抗氧化系统的影响仍不清楚。
通过实验室模拟实验，利用0厘米、15厘米、30厘米和45厘米四个地下水位深度水平，研究地下卤水深度变化的影响。
结果表明，不同地下卤水深度对[植物名称未给出]的光合特性和抗氧化系统有显著影响，0至30厘米的地下卤水深度适合[植物名称未给出]生长。[植物名称未给出]的净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）、光利用效率（LUE）和羧化效率（CE）随地下卤水深度增加先升高后降低。[植物名称未给出]的气孔限制值（Ls）和水分利用效率在地下水位深度为0厘米时达到峰值，与0厘米处理相比，在15厘米、30厘米和45厘米时水分利用效率分别降低了19.4%、8.0%和8.6%。随着地下卤水深度的加深，LUE和CE值先升高后降低，在深度为30厘米时达到峰值。[植物名称未给出]的抗氧化酶（SOD、POD和CAT）活性随地下卤水深度增加先降低后升高。地下卤水深度为30厘米时酶活性最低。随着地下水位深度增加，丙二醛（MDA）含量先降低后升高。在45厘米深度时观察到[植物名称未给出]叶片的膜过氧化程度最高。
我们的研究表明，在地下卤水深度为45厘米时，[植物名称未给出]的抗氧化能力减弱，其生长受到抑制。
