L. Benedetti, Ananda Scherner, Cristina C. Cuchiara, Ítalo Lucas de Moraes, Luis A. Avila, S. Deuner
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Objective: This study aimed to evaluate osmotic potential, cell damage, and enzyme activities of the antioxidant metabolism on soybean after treatment with herbicides and salinity stress conditions. Methods: For this purpose, completely randomized design was used in a factorial scheme with three replicates. The A factor included four herbicide treatments, as follows: control (no herbicide), sulfentrazone, Smetolachlor, and sulfentrazone + S-metolachlor. The B factor was represented by the following three salinity levels: 0 (control), 60, and 120 mM NaCl, which were applied 24 hours after soybean sowing. Results: The results showed a significant alteration in the osmotic potential of soybean plants, mainly at higher salt concentrations. Although an increase in the lipid peroxidation has been detected in some treatments, antioxidant enzyme action combined with osmotic adjustment to reduce oxidative damage were mechanisms found to be employed by plants to reduce hydrogen peroxide levels. 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引用次数: 3
摘要
背景:大豆种植一直是巴西南部南大德州低地土壤灌溉水稻作物多样化生产系统和轮作除草剂的一种选择。然而,在这些土壤中已经检测到高盐度水平,由于土壤溶液的渗透势降低,可以抑制植物生长,并可能导致毒性。种植区的压力因素组合在一起会加剧有害影响,例如与除草剂相关的盐度变化会引发作物的氧化应激。目的:研究除草剂和盐胁迫对大豆抗氧化代谢的渗透电位、细胞损伤和酶活性的影响。方法:为此,采用完全随机设计,三次重复的析因方案。A因子包括4种除草剂处理,分别为对照(无除草剂)、磺胺曲酮、异甲草胺、磺胺曲酮+ s -异甲草胺。B因子由3个盐度水平表示:0(对照)、60和120 mM NaCl,分别在大豆播种24 h后施用。结果:大豆植株的渗透势发生了显著的变化,主要是在较高的盐浓度下。虽然在一些处理中检测到脂质过氧化的增加,但抗氧化酶的作用结合渗透调节来减少氧化损伤是植物减少过氧化氢水平的机制。结论:在盐胁迫下,除草剂处理能改变大豆植株的生理生化过程。
Soybean plant osmotic and oxidative stress as affected by herbicide and salinity levels in soil
Background: Soybean cultivation has been an option used to diversify the production system and perform herbicide rotation in irrigated rice crops in the lowland soils of the Rio Grande do Sul State, southern Brazil. However, elevated salinity levels have been detected in these soils that can inhibit plant growth due to the reduction of the osmotic potential of the soil solution and can causes toxicity. The combination of stress factors in the plantation areas can intensify deleterious effects, such as changes in salinity associated with herbicides that trigger oxidative stress in crops. Objective: This study aimed to evaluate osmotic potential, cell damage, and enzyme activities of the antioxidant metabolism on soybean after treatment with herbicides and salinity stress conditions. Methods: For this purpose, completely randomized design was used in a factorial scheme with three replicates. The A factor included four herbicide treatments, as follows: control (no herbicide), sulfentrazone, Smetolachlor, and sulfentrazone + S-metolachlor. The B factor was represented by the following three salinity levels: 0 (control), 60, and 120 mM NaCl, which were applied 24 hours after soybean sowing. Results: The results showed a significant alteration in the osmotic potential of soybean plants, mainly at higher salt concentrations. Although an increase in the lipid peroxidation has been detected in some treatments, antioxidant enzyme action combined with osmotic adjustment to reduce oxidative damage were mechanisms found to be employed by plants to reduce hydrogen peroxide levels. Conclusions: We concluded that herbicide treatment, in combination with saline stress, can alter physiological and biochemical processes of soybean plants.
Planta DaninhaAgricultural and Biological Sciences-Plant Science
自引率
0.00%
发文量
0
审稿时长
16 weeks
期刊介绍:
Planta Daninha is a scientific journal published by the Brazilian Society of Weed Science (SBCPD - Sociedade Brasileira da Ciência das Plantas Daninhas). Papers submitted for publication must be sent through an electronic system, on http://www.scielo.br/pd. Works may be written in Portuguese, English, or Spanish, and will be accepted after being reviewed and approved by the Editorial Board. Only papers that have not been published or submitted for publication in other media will be accepted. Articles in Portuguese will be translated to English after being properly corrected and authorized by the authors. Planta Daninha has with goal to publish genuine technical-scientific papers and literature reviews from a critical perspective on Biology, weed management, and related topics.