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首页> 外文期刊>African Journal of Biotechnology >Tissue diversity in respiratory metabolism and free radical processes in embryonic axes of the white mangrove (Avicennia marina L.) during drying and wet storage
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Tissue diversity in respiratory metabolism and free radical processes in embryonic axes of the white mangrove (Avicennia marina L.) during drying and wet storage

机译：在干燥和湿存储期间，白红树林（Avicennia marina L.）胚轴的呼吸代谢和自由基过程中的组织多样性

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摘要

Species diversity in responses to desiccation in plants is well studied and documented. However, organ and tissue variability in plant dehydration responses is not as well investigated and understood. Therefore, the responses of whole axes, hypocotyls, root primordia and plumules of white mangrove to drying and wet storage were monitored. Increasing the rate of drying lowered the critical and lethal water concentrations for survival as assessed by germination capacity and tetrazolium staining. Dehydration and hydrated storage were generally associated with decrease in activities of phosphofructokinase (PFK) and malate dehydrogenase and levels of nicotinamide adenine dinucleotide and an increase in the levels of hydroperoxides in whole axes, hypocotyls, root primordia and plumules and membrane damage in axes. Increase in the activities of superoxide dismutase and catalase and decrease in the activities of glutathione reductase and amounts of ascorbate accompanied drying and moist storage in all tissues, in general. Apart from the activity of PFK, the plumules showed the highest activities and quantities of all the enzymes and compounds among the tissues during desiccation and wet storage. It is possible that this tissue, despite its relatively small size and volume plays disproportionately an important role in the events described. Nonetheless, it is likely that physical rather than metabolic damage underlined loss of viability as it occurred at high water concentration.
机译：充分研究和证明了植物对干旱造成的物种多样性。但是，植物脱水反应中器官和组织的变异性还没有得到很好的研究和理解。因此，监测了红树林的整个轴，下胚轴，根原基和小枝对干燥和湿润存储的响应。通过发芽能力和四唑鎓染色评估，提高干燥速度降低了生存所需的临界水和致死水浓度。脱水和水合贮藏通常与磷酸果糖激酶（PFK）和苹果酸脱氢酶的活性降低以及烟酰胺腺嘌呤二核苷酸的水平降低，全轴，下胚轴，根原基和根管中的氢过氧化物水平升高以及轴膜受损有关。通常，在所有组织中，超氧化物歧化酶和过氧化氢酶的活性增加，谷胱甘肽还原酶的活性降低，抗坏血酸的量伴随干燥和湿润存储。除了PFK的活性外，在干燥和湿润存储期间，这些小孔显示出组织中所有酶和化合物的最高活性和最高数量。尽管该组织的尺寸和体积相对较小，但在描述的事件中可能起着不成比例的重要作用。但是，很可能是生理上的而不是代谢上的破坏强调了活力的丧失，因为它是在高水浓度下发生的。

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