干旱胁迫下藜麦种子萌发及对硒的生理响应

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY Bragantia Pub Date : 2022-01-01 DOI:10.1590/1678-4499.20210183
Shocofeh Gholami, M. A. Dehaghi, A. Rezazadeh, A. Naji
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引用次数: 5

摘要

藜麦发芽初期对干旱胁迫敏感。为此,利用聚乙二醇(PEG 6000)研究了干旱胁迫条件下不同浓度硒对藜麦发芽特性及部分抗氧化酶的影响。第一个实验因素是用0.5、1.5、3、4.5、6 mg·L−1浓度的硒(硒酸钠和硒纳米粒子:SeNPs≈33.4 nm)进行种子启动,同时不进行任何启动处理作为对照。第二个因素是干旱胁迫,PEG 6000浓度分别为0、-0.4、-0.8和-1.2 MPa。干旱胁迫下活性氧(ROS)的积累对大部分测定性状有负面影响。在适当硒浓度处理下,种子萌发参数、抗氧化酶活性、脯氨酸和蛋白质含量均高于对照处理。在严重胁迫(-1.2 MPa)条件下,4.5、6.0和4.5 mg·L−1的硒纳米颗粒对过氧化氢酶(CAT)、超氧化物歧化酶(SOD)和抗坏血酸过氧化物酶(APX)的活性最高。硒纳米粒子浓度大于3 mg·L−1和硒酸钠浓度为3 mg·L−1的对照(无胁迫)条件下,光合色素积累量最高。本研究表明,硒可以通过改变藜麦的发芽特性和生化特性来减轻干旱胁迫对藜麦的有害影响。
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Seed germination and physiological responses of quinoa to selenium priming under drought stress
The early stages of quinoa germination are sensitive to drought stress. For this purpose, a study entitled the effect of selenium in different concentrations on germination characteristics and some antioxidant enzymes of quinoa under drought stress conditions with polyethylene glycol (PEG 6000) was investigated. The first experimental factor was seed priming with selenium (from two sources: sodium selenate and selenium nanoparticles: SeNPs ≈ 33.4 nm) at 0.5, 1.5, 3, 4.5, 6 mg·L−1 concentrations, besides, no priming treatment was used as control. The second factor was drought stress with PEG 6000 in concentrations 0, –0.4, –0.8, and –1.2 MPa. Drought stress with accumulation of reactive oxygen species (ROS) had a negative effect on most of the measured traits. In seeds that were primed with appropriate selenium concentrations, germination parameters and antioxidant enzyme activity as well as proline and protein content increased compared to the control treatment. Under conditions of severe stress (–1.2 MPa), the highest activity of catalase (CAT), superoxide dismutase (SOD), and ascorbate peroxidase (APX) enzymes was observed in prime with selenium nanoparticles at concentrations of 4.5, 6.0 and 4.5 mg·L−1, respectively. Concentrations higher than 3 mg·L−1 of selenium nanoparticles and concentrations of 3 mg·L−1 sodium selenate had the highest accumulation of photosynthetic pigments under control (stress-free) conditions. The present study shows that selenium priming can reduce the harmful effects of drought stress on quinoa by altering germination properties and biochemical properties.
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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