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首页> 外文期刊>African Journal of Biotechnology >Physiological and biochemical responses to low temperature stress in hybrid clones of Populus ussuriensis Kom. P. deltoides Bartr
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Physiological and biochemical responses to low temperature stress in hybrid clones of Populus ussuriensis Kom. P. deltoides Bartr

机译：毛白杨杂种无性系对低温胁迫的生理生化响应三角松

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摘要

Cuttings of three hybrid clones of?P. ussuriensis?×?P. deltoides?were exposed to different low temperatures (cold and freezing) for 24 h, or consecutive low temperatures (5°C, 0 to 120 h), to determine physiological and biochemical responses to cold stress in these woody plants. Soluble sugar and protein contents increased in the three clones under cold (10, 5°C) stress,?malondialdehyde?(MDA) concentrations, electrolytes leak and activities of?superoxide dismutase (SOD),catalase (CAT),?peroxidase (POD),?ascorbate peroxidase (APX)?and?glutathione reductase (GR)?also variously increased at 10, 5, and 0°C. While under lower temperatures (-5, -10, and -15°C) treatment, levels of all except electrolytes leak and MDA gradually decreased relatively. During consecutive low temperature (5°C) treatment, concentrations of soluble protein and MDA, electrolytes leak and activities of CAT, APX and GR increased immediately or after 3 h, however, soluble sugar concentrations and SOD and POD activities slightly decreased at the beginning of the treatment; subsequently increased quickly, and then declined. When exposed to different (10, 5, 0, -5, and -10°C) and consecutive (5°C, after 12 or 24h) low temperature stresses, there were significant differences between the three clones. Levels of soluble sugar and soluble protein, and SOD, CAT, POD, APX and GR activities were relatively higher in clone UD183 than in UD189 or UD191. Levels of electrolyte leak and MDA were lower than in UD189 or UD191. Poplar hybrid clones thus employ various physiological and biochemical responses and mechanisms for coping with low temperature stress. According to?the?results?of this study, we presume that clone UD183 may acquire much more freezing- tolerance than clones UD189 and UD191. Our research will promote understanding of cold acclimation and freezing-tolerance in poplars, and encourage selection of the best clones for the cold regions of northern China.
机译：三个P的杂种无性系的插条。 ussuriensis？×？P。将deltoides？暴露于不同的低温（冷和冷冻）中24 h或连续的低温（5°C，0至120 h），以确定这些木本植物对冷胁迫的生理和生化反应。在低温（10、5°C），丙二醛（MDA）浓度，电解质泄漏和超氧化物歧化酶（SOD），过氧化氢酶（CAT），过氧化物酶（POD）活性下，三个克隆中可溶性糖和蛋白质含量增加。 ），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）在10、5和0°C时也有不同程度的增加。在较低的温度（-5，-10和-15°C）下进行处理时，除电解液泄漏和MDA以外的所有其他物质的含量都相对降低。在连续低温（5°C）处理期间，可溶性蛋白质和MDA的浓度，电解质的泄漏以及CAT，APX和GR的活性立即或在3小时后增加，但是可溶性糖浓度以及SOD和POD活性在开始时略有下降。治疗方法随后迅速增加，然后下降。当暴露于不同的（10、5、0，-5和-10°C）和连续的（5°C，12或24h后）低温胁迫时，这三个克隆之间存在显着差异。 UD183克隆中的可溶性糖和可溶性蛋白水平以及SOD，CAT，POD，APX和GR活性相对高于UD189或UD191。电解液泄漏和MDA的水平低于UD189或UD191。因此，杨树杂种克隆利用各种生理和生化反应以及应对低温胁迫的机制。根据这项研究的结果，我们认为克隆UD183可能比克隆UD189和UD191获得更多的耐冻性。我们的研究将促进对杨树的冷驯化和耐冻性的了解，并鼓励选择适合中国北方寒冷地区的最佳无性系。

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