长期轻度接触镉会使番茄植株更容易脱水。

IF 6.1 2区生物学 Q1 PLANT SCIENCES

Plant Physiology and Biochemistry Pub Date : 2024-10-16 DOI:10.1016/j.plaphy.2024.109200

Douaa Bekkai , Maria T. Chiofalo , Daniele Torre , Stefano Mileto , Giuseppa Genovese , Francesco Cimino , Giovanni Toscano , Daniela Iannazzo , Patrizia Trifilò

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引用次数: 0

摘要

重金属污染会增加植物对生物和非生物胁迫的易感性。然而，重金属污染对植物水力学（对植物生产力至关重要）的综合影响，以及重金属胁迫与环境因素之间对植物健康的交互作用尚未完全清楚。在本研究中，我们研究了镉暴露对栽培品种皮卡迪利（Piccadilly）番茄（Solanum lycopersicum L.）植物水关系和水力学的影响。我们特别关注了叶片水力传导（KL）对镉污染和脱水的反应。镉暴露对番茄产量的影响可以忽略不计，但却导致压力-体积衍生性状的显著差异。与对照样本相比，镉处理过的植株的叶片和根部显示出壁刚度降低。然而，与对照样品相比，镉处理过的叶片的负张力损失点（Ψtlp）较小，而镉处理过的根部由于在充分张力时渗透势较低，因此负Ψtlp 值较大。与对照组相比，镉处理过的植物的叶片和根细胞显示出更高的饱和含水量，同时两个实验组的矿物质含量也截然不同。尽管对照组和镉处理组的叶片在 50%和 80% KL 损失时的叶片水势阈值相似，但在镉污染土壤中生长的植物即使在浇水充足的条件下，叶片细胞受损程度也更高。这反过来又通过损害细胞的补水能力，影响了植物从干旱中恢复过来的能力。总之，本研究结果表明，在水分供应不足的条件下，镉污染会增加叶片水力衰竭的风险。

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Chronic mild cadmium exposure increases the vulnerability of tomato plants to dehydration

Heavy metal contamination increases plant susceptibility to both biotic and abiotic stresses. However, the comprehensive impact of heavy metal pollution on plant hydraulics, which is crucial for plant productivity, and the interaction between heavy metal stress and environmental factors on plant health are not yet fully understood. In this study, we investigated the effects of cadmium exposure on plant-water relations and hydraulics of Solanum lycopersicum L., cultivar Piccadilly. Particular attention was given to leaf hydraulic conductance (K_L) in response to cadmium pollution and dehydration.

Cadmium exposure exhibited negligible impacts on tomato productivity but resulted in significant differences in pressure-volume derived traits. Leaves and roots of Cd-treated plants showed reduced wall stiffness compared to control samples. However, Cd-treated leaves had a less negative turgor loss point (Ψ_tlp), whereas Cd-treated roots exhibited more negative Ψ_tlp values due to lower osmotic potential at full turgor compared to control samples.

Leaves and root cells of Cd-treated plants showed higher values of saturated water content compared to control plants, along with a distinct mineral profile between the two experimental groups. Despite similar leaf water potential thresholds for 50% and 80% loss of K_L in control and cadmium-treated leaves, plants grown in cadmium-polluted soil showed higher leaf cell damages even under well watered conditions. This, in turn, affected the plant ability to recover from drought upon rehydration by compromising cell rehydration ability.

Overall, the present findings suggest that under conditions of low water availability, cadmium pollution increases the risk of leaf hydraulic failure.

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来源期刊

Plant Physiology and Biochemistry 生物-植物科学

CiteScore

11.10

自引率

3.10%

发文量

410

审稿时长

33 days

期刊介绍： Plant Physiology and Biochemistry publishes original theoretical, experimental and technical contributions in the various fields of plant physiology (biochemistry, physiology, structure, genetics, plant-microbe interactions, etc.) at diverse levels of integration (molecular, subcellular, cellular, organ, whole plant, environmental). Opinions expressed in the journal are the sole responsibility of the authors and publication does not imply the editors'' agreement. Manuscripts describing molecular-genetic and/or gene expression data that are not integrated with biochemical analysis and/or actual measurements of plant physiological processes are not suitable for PPB. Also "Omics" studies (transcriptomics, proteomics, metabolomics, etc.) reporting descriptive analysis without an element of functional validation assays, will not be considered. Similarly, applied agronomic or phytochemical studies that generate no new, fundamental insights in plant physiological and/or biochemical processes are not suitable for publication in PPB. Plant Physiology and Biochemistry publishes several types of articles: Reviews, Papers and Short Papers. Articles for Reviews are either invited by the editor or proposed by the authors for the editor''s prior agreement. Reviews should not exceed 40 typewritten pages and Short Papers no more than approximately 8 typewritten pages. The fundamental character of Plant Physiology and Biochemistry remains that of a journal for original results.