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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Drought resistance in rice seedlings conferred by seed priming: Role of the anti-oxidant defense mechanisms
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Drought resistance in rice seedlings conferred by seed priming: Role of the anti-oxidant defense mechanisms

机译：引发使水稻幼苗的抗旱性：抗氧化防御机制的作用

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摘要

Seed priming is a method by which seeds are subjected to different stress conditions to impart stress adaptation in seedlings germinating and growing under stressful situations. Drought stress is a major reason behind failure of crops. We studied the effects of hydropriming, dehydration priming (induced by PEG), and osmopriming (induced by NaCl and KH_2PO_4) on subsequent germination, growth and anti-oxidant defense mechanisms of 2-week-old rice seedlings under continuing dehydration stress. Unprimed seeds grown in PEG showed significantly lower germination and growth along with significantly higher reactive oxygen species (ROS) and lipid peroxidation levels. Among the priming methods, 5 % PEG priming was found to be the best in terms of germination and growth rate along with the lowest amount of ROS and lipid peroxidation (malondialdehyde [MDA]) values. MDA levels were reduced significantly by all of the priming methods. Hence, reduction of lipid peroxidation may be a key factor underlying the drought tolerance produced by the priming treatments. Glutathione peroxidase (GPX) activity seemed to bear an excellent correlation with oxidative stress resistance through seed priming. The PEG priming produced minimum peroxidative damage and superior germination and growth rate along with efficient GPX activity, overexpressed MnSOD and maintenance of HSP70 expression in normal as well as in drought condition. Therefore, in PEG-primed seeds the existence of robust protective mechanisms is definitely indicated.
机译：种子引发是使种子经受不同胁迫条件以赋予种子在胁迫条件下发芽和生长的胁迫适应的方法。干旱是造成农作物歉收的主要原因。我们研究了加水启动，脱水启动（由PEG诱导）和渗透启动（由NaCl和KH_2PO_4诱导）对持续脱水胁迫下2周龄水稻幼苗随后萌发，生长和抗氧化防御机制的影响。在PEG中生长的未上底种子显示出较低的发芽和生长，以及较高的活性氧（ROS）和脂质过氧化水平。在引发方法中，发现5％的PEG引发方法在发芽和生长速率方面最佳，而ROS和脂质过氧化（丙二醛[MDA]）值最低。通过所有引发方法，MDA水平均显着降低。因此，减少脂质过氧化可能是引发处理产生的抗旱性的关键因素。谷胱甘肽过氧化物酶（GPX）活性似乎与通过种子引发抗氧化胁迫具有极好的相关性。在正常和干旱条件下，PEG引发都能产生最小的过氧化损伤，优异的发芽和生长速率，以及有效的GPX活性，过表达的MnSOD和维持HSP70的表达。因此，在PEG引发的种子中明确表明存在强大的保护机制。

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