Does aluminum induce high proline concentration in Pinus sylvestris, an Al-tolerant species?

IF 2.2 4区生物学 Q2 PLANT SCIENCES Theoretical and Experimental Plant Physiology Pub Date : 2024-01-06 DOI:10.1007/s40626-023-00302-3

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Abstract

Proline is an amino acid acting as an osmoprotector in plants, as it reduces osmotic potential and enhances plant water uptake, especially under drought. Aluminum (Al) toxicity causes inhibition of root growth and low leaf hydration with negative consequences for photosynthetic performance. Thus, plants under Al toxicity could benefit from proline accumulation. Here we investigated whether proline is induced by Al in Pinus sylvestris, an Al-tolerant woody species. Proline and abscisic acid (ABA) concentration, gas exchange rates, stomatal conductance (gs), relative needle water content (RWC), stem water potential (Ψw), biometric data and plant biomass were evaluated in plants grown in nutrient solution with 0, 250, 500, and 1000 μM Al for 42 days. Plant growth, gas exchange rates, RWC and ABA were the same between the four treatments, as expected for an Al-tolerant species. The maintenance of needle hydration throughout the study provides a plausible explanation for the similar gas exchange values observed between Al-treated and untreated plants. Over the course of 7 to 14 days, plants exposed to Al showed a decrease in midday stem water potential (Ψmd), and an increase in proline concentration. Subsequently, both parameters exhibited similar values between treatments until the end of the study. These findings suggest proline may play a role in osmotic adjustment in P. sylvestris exposed to Al.

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铝是否会诱导耐铝树种 Pinus sylvestris 的脯氨酸浓度升高？

摘要脯氨酸是一种氨基酸，在植物体内起着渗透保护作用，因为它能降低渗透势，提高植物的吸水能力，尤其是在干旱条件下。铝（Al）毒性会抑制根系生长，降低叶片水合作用，对光合作用产生负面影响。因此，铝毒性下的植物可以从脯氨酸的积累中获益。在此，我们研究了耐铝的木本植物 Pinus sylvestris 是否会受到铝的诱导而产生脯氨酸。在含有 0、250、500 和 1000 μM Al 的营养液中生长 42 天的植物，其脯氨酸和脱落酸（ABA）浓度、气体交换速率、气孔导度（gs）、针叶相对含水量（RWC）、茎干水势（Ψw）、生物计量数据和植物生物量均得到了评估。植物的生长、气体交换率、RWC 和 ABA 在四种处理之间是相同的，这也是耐铝物种的预期结果。在整个研究过程中，针叶的水合作用一直保持不变，这也是铝处理植物和未处理植物气体交换值相似的一个合理解释。在 7 到 14 天的过程中，暴露于铝的植物显示出正午茎干水势（Ψmd）的下降和脯氨酸浓度的上升。随后，直到研究结束，这两个参数在不同处理之间表现出相似的值。这些研究结果表明，脯氨酸可能在暴露于 Al 的西洋芹的渗透调节中发挥作用。

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来源期刊

Theoretical and Experimental Plant Physiology PLANT SCIENCES-

CiteScore

4.20

自引率

7.70%

发文量

期刊介绍： The journal does not publish articles in taxonomy, anatomy, systematics and ecology unless they have a physiological approach related to the following sections: Biochemical Processes: primary and secondary metabolism, and biochemistry; Photobiology and Photosynthesis Processes; Cell Biology; Genes and Development; Plant Molecular Biology; Signaling and Response; Plant Nutrition; Growth and Differentiation: seed physiology, hormonal physiology and photomorphogenesis; Post-Harvest Physiology; Ecophysiology/Crop Physiology and Stress Physiology; Applied Plant Ecology; Plant-Microbe and Plant-Insect Interactions; Instrumentation in Plant Physiology; Education in Plant Physiology.