Plasticity of photorespiratory carbon concentration mechanism in Sedobassia sedoides (Pall.) Freitag & G. Kadereit under elevated CO2 concentration and salinity

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Journal of Arid Land Pub Date : 2024-07-31 DOI:10.1007/s40333-024-0018-y
Zulfira Rakhmankulova, Elena Shuyskaya, Maria Prokofieva, Kristina Toderich, Pavel Voronin
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Abstract

Rising atmospheric CO2 (carbon dioxide) concentrations and salinization are manifestations of climate change that affect plant growth and productivity. Species with an intermediate C3–C4 type of photosynthesis live in a wide range of precipitation, temperature, and soil quality, but are more often found in warm and dry habitats. One of the intermediate C3–C4 photosynthetic type is C2 photosynthesis with a carbon concentration mechanism (CCM) that reassimilates CO2 released via photorespiration. However, the ecological significance under which C2 photosynthesis has advantages over C3 and C4 plants remains largely unexplored. Salt tolerance and functioning of CCM were studied in plants from two populations (P1 and P2) of Sedobassia sedoides (Pall.) Freitag & G. Kadereit Asch. species with C2 photosynthesis exposed to 4 d and 10 d salinity (200 mM NaCl) at ambient (785.7 mg/m3, aCO2) and elevated (1571.4 mg/m3, eCO2) CO2. On the fourth day of salinity, an increase in Na+ content, activity catalase, and superoxide dismutase was observed in both populations. P2 plants showed an increase in proline content and a decrease in photosynthetic enzyme content: rubisco, phosphoenolpyruvate carboxylase (PEPC), and glycine decarboxylase (GDC), which indicated a weakening of C2 and C4 characteristics under salinity. Treatment under 10 d salinity led to an increased Na+ content and activity of cyclic electron flow around photosystem I (PSI CEF), a decreased content of K+ and GDC in both populations. P1 plants showed greater salt tolerance, which was assessed by the degree of reduction in photosynthetic enzyme content, PSI CEF activity, and changes in relative growth rate (RGR). Differences between populations were evident under the combination of eCO2 and salinity. Under long-term salinity and eCO2, more salt-tolerant P1 plants had a higher dry biomass (DW), which was positively correlated with PSI CEF activity. In less salt-tolerant P2 plants, DW correlated with transpiration and dark respiration. Thus, S. sedoides showed a high degree of photosynthetic plasticity under the influence of salinity and eCO2 through strengthening (P1 plants) and weakening C4 characteristics (P2 plants).

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高浓度二氧化碳和盐度条件下 Sedobassia sedoides (Pall.) Freitag & G. Kadereit 光呼吸碳浓度机制的可塑性
大气中二氧化碳(CO2)浓度的上升和盐碱化是气候变化的表现形式,会影响植物的生长和生产力。具有 C3-C4 中间光合作用类型的物种可在各种降水、温度和土壤质量条件下生活,但更多地生活在温暖干燥的生境中。C2 光合作用是 C3-C4 光合作用的中间类型之一,它具有一种碳浓缩机制(CCM),可重新吸收通过光呼吸释放的二氧化碳。然而,与 C3 和 C4 植物相比,C2 光合作用在哪些生态学意义上具有优势仍未得到深入探讨。研究人员对具有 C2 光合作用的 Sedobassia sedoides (Pall.) Freitag & G. Kadereit Asch.物种的两个种群(P1 和 P2)的植物进行了耐盐性和 CCM 功能研究。盐渍第四天,两个种群的 Na+ 含量、过氧化氢酶活性和超氧化物歧化酶都有所增加。P2 植物的脯氨酸含量增加,光合作用酶含量减少:红蛋白酶、磷酸烯醇丙酮酸羧化酶(PEPC)和甘氨酸脱羧酶(GDC),这表明盐度条件下 C2 和 C4 特性减弱。在盐度条件下处理 10 天后,两个种群的 Na+含量和光系统 I 周围的循环电子流(PSI CEF)活性均有所增加,K+和 GDC 的含量均有所下降。P1 植物表现出更强的耐盐性,这可以通过光合作用酶含量、PSI CEF 活性的降低程度以及相对生长速率(RGR)的变化来评估。在 eCO2 和盐度的共同作用下,不同种群之间的差异非常明显。在长期盐度和 eCO2 条件下,耐盐性较强的 P1 植物的干生物量(DW)较高,这与 PSI CEF 活性呈正相关。在耐盐性较差的 P2 植物中,干生物量与蒸腾作用和暗呼吸作用相关。因此,在盐度和 eCO2 的影响下,S. sedoides 通过加强(P1 植物)和削弱(P2 植物)C4 特性,表现出高度的光合可塑性。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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