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Antioxidant and ultrastructural responses to priming with PEG in aged, ultra-dry oat seed

机译：老化的超干燕麦种子对PEG引发的抗氧化和超微结构响应

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摘要

This experiment was designed to measure the changes in ultrastructure, antioxidant enzymatic activities and lipid peroxidation in ultra-dried (4% moisture content) and artificially aged (48 days at 45 degrees C) oat (Avena sativa L.) seeds. The seeds were also primed with polyethylene glycol (PEG) solutions (0,-0.3,-0.6,-0.9 and-1.2 MPa) for 12 hours at 20 degrees C. The results showed that seed vigour, antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX) and glutathione reductase (GR), and the ultrastructure of the embryo cells were improved at lower water potential, whilst the malondialdehyde (MDA) contents decreased significantly (P < 0.05). This indicated that the effect of PEG-priming on seed vigour was positively related to antioxidant enzymes and ultrastructure of embryo cells, but was negatively related to MDA content. In terms of ultrastructure, the mitochondria were the most sensitive organelles to PEG-priming. PEG priming at 0 ,-0.3 and -0.6 MPa aggravated the damage of seed ageing, but priming at -0.9 and -1.2 MPa was beneficial. It is therefore recommended that the water potential used for priming with PEG should be less than -0.9 MPa for ultra-dried aged seeds.
机译：本实验旨在测量燕麦（Avena sativa L.）种子的超干（4％水分含量）和人工老化（在45摄氏度下48天）的超微结构，抗氧化酶活性和脂质过氧化的变化。种子还用聚乙二醇（PEG）溶液（0，-0.3，-0.6，-0.9和-1.2 MPa）在20摄氏度下灌注12小时。结果表明，种子的活力，抗氧化酶包括超氧化物歧化酶（SOD） ），过氧化氢酶（CAT），过氧化物酶（POD），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR），并且在较低水势下胚胎细胞的超微结构得到改善，而丙二醛（MDA）含量显着下降（P < 0.05）。这表明PEG引发对种子活力的影响与抗氧化酶和胚胎细胞的超微结构呈正相关，而与MDA含量呈负相关。就超微结构而言，线粒体是对PEG引发最敏感的细胞器。 PEG在0，-0.3和-0.6 MPa时引发会加剧种子老化，但在-0.9和-1.2 MPa时引发是有益的。因此，对于超干老化种子，建议用于PEG引发的水势应小于-0.9 MPa。

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