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为探索低压低氧环境中培养植物的可行性,研究了短期低压和低氧对莴苣气体交换、叶片超微结构和抗逆特性的影响。将莴苣植株(25天株龄)在两种总压(101 k Pa和30 k Pa)和三种氧分压(21 k Pa、6 k Pa和2 k Pa)条件下进行了1小时和24小时平衡处理。发现短期低压和低氧均未影响莴苣植株生物量、根冠比、含水量和大部分矿质养分含量;短期低氧(6 k Pa或2 k Pa)提高莴苣叶片光合速率,增加可溶性糖和丙二醛的含量,但降低暗呼吸速率,并且2 k Pa氧分压导致线粒体变形和蒸腾速率下降;短期低压处理(30 k Pa)增加暗呼吸速率和蒸腾速率,减少可溶性糖和丙二醛的含量。研究表明,莴苣可以在短期低压低氧环境中生长,但短期低氧(6 k Pa或2 k Pa)造成莴苣逆境胁迫,而低压(30 k Pa)能够提高其抗逆性。
In order to explore the feasibility of plant culture in low-pressure and low-oxygen environment, the effects of short-term low pressure and hypoxia on the gas exchange, leaf ultrastructure and anti-retrogradation of lettuce were studied. Lettuce plants (25 day old) were subjected to two hours of total pressure (101 kPa and 30 kPa) and three oxygen partial pressures (21 kPa, 6 kPa and 2 kPa) for 1 hour and 24 hours Hourly balance treatment. Short-term hypobaric hypoxia and hypoxia did not affect plant biomass, root / shoot ratio, water content and most of the mineral nutrient content. Short-term hypoxia (6 kPa or 2 kPa) increased photosynthetic rate of lettuce leaves and increased soluble sugar and C But decreased the dark respiration rate, and the oxygen partial pressure of 2 kPa led to the decrease of mitochondrial deformation and transpiration rate. Short-term low pressure treatment (30 kPa) increased the dark respiration rate and transpiration rate and decreased the content of soluble sugar and malondialdehyde content. Studies have shown that lettuce can grow in the short-term hypobaric hypoxia environment, but short-term hypoxia (6 kPa or 2 kPa) leads to stress on lettuce stress, while low pressure (30 kPa) can increase its stress resistance.