硒补渗:番茄种子对水分亏缺反应的生理生理品质

IF 1.1 4区 农林科学 Q3 AGRONOMY Journal of Seed Science Pub Date : 2023-03-13 DOI:10.1590/2317-1545v45267349
A. S. Silveira, D. T. Pinheiro, R. Oliveira, D. Dias, L. J. Silva
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引用次数: 0

摘要

摘要/ Abstract摘要:番茄是一种对水分亏缺敏感的作物,在水分亏缺的条件下,种子对萌发的响应涉及生化、生理和分子过程。本研究旨在探讨硒(Se)浸渍和水分亏缺对番茄种子萌发过程中生理生化变化的影响。用PEG 6000溶液(-1.0 MPa)和Na2SeO4 (12.5 μM)浸泡番茄种子,或只用PEG 6000溶液浸渍24 h,或不浸渍。不同处理的种子分别遭受水分亏缺(-0.3 MPa)和水分控制(0 MPa)。进行图像分析(x射线),通过萌发试验获得生理指标,并测定SOD、CAT和POX酶的活性。浸渍处理,尤其是聚乙二醇处理,使两种材料的种子密度和灰色平均值均高于未浸渍处理的种子。水分亏缺条件下的种子生理性能下降,酶活性降低。硒不诱导种子对水分亏缺产生抗性。PEG 6000在-1.0 MPa下浸渍是一种有效提高耐亏感番茄种子生理品质的技术。此外,抗氧化酶CAT是水分亏缺条件下番茄幼苗抗氧化能力的一个指标。
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Osmopriming with selenium: physical and physiological quality of tomato seeds in response to water deficit
Abstract: Tomato is a crop sensitive to water deficit and the responses of seeds to germination under these conditions involve biochemical, physiological, and molecular processes. The aim of this study was to evaluate the physical, physiological, and biochemical changes in tomato seeds osmoprimed with selenium (Se) and subjected to water deficit during germination. Tomato seeds of the LA 4050 and LA 3475 accessions were osmoprimed with PEG 6000 solution (-1.0 MPa) plus Na2SeO4 (12.5 μM) or only with PEG 6000 solution for 24 h or unprimed. The seeds from the different treatments were subjected to water deficit (-0.3 MPa) or to control (0 MPa). Image analyses were performed (X-ray), physiological variables were obtained by the germination test and activities of SOD, CAT and POX enzymes were determined. Osmopriming, especially with PEG, provided the seeds of both accessions with higher densities and gray mean when compared to unprimed ones. Seeds under water deficit showed lower physiological performance and lower enzymatic activity. Se did not induce seed resistance to water deficit. Osmopriming with PEG 6000 at -1.0 MPa is an efficient technique for improving the physiological quality of seeds of tomato accessions susceptible and tolerant to water deficit. Moreover, the antioxidant enzyme CAT proved to be an indicator of oxidative stress tolerance in tomato seedlings under water deficit.
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来源期刊
Journal of Seed Science
Journal of Seed Science Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.00
自引率
30.00%
发文量
28
审稿时长
12 weeks
期刊介绍: From 2017 the Journal of Seed Science (JSS) will circulate online version only. Original scientific studies and communications, not yet published or submitted to another journal for publication and written in Portuguese or English, will be accepted for publication. For manuscripts submitted in English, the authors should provide an adequated version. The SCIENTIFIC COMMUNICATION is a category of scientific manuscript which describes a technique, an equipment, new species or observations and surveys of limited results. It has the same scientific rigor as the “Scientific Articles” and the same value as a publication. The classification of a manuscript as a SCIENTIFIC COMMUNICATION is based on its content and scientific merit but it can be a preliminary study, simple and not definitive on a certain subject, with publication justified by its uniqueness and contribution to the area. The Editorial Board of the JSS may invite leading authors of recognized reputation to compose specific Review Articles covering topics of their specialization that will convey to the scientific community the state-of-the-art knowledge related to the specific theme.
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