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目的在低压环境下培养植物,探索低压和低氧对植物生长和营养品质的影响。方法预培养15天的莴苣植株在2种总压(101和30 kPa)和3种氧分压(21,6和2 kPa)下进行了20 d生长试验。结果在两种总压下,降低氧分压(6或2 kPa)显著抑制了莴苣植株生长,生物量、根冠比、含水量、矿质养分、有机组份含量(维生素C、粗蛋白质和粗脂肪)和类胡萝卜素含量显著下降;但叶绿素含量和丙二醛含量显著增加。相同氧分压下,总压降低(30 kPa)并未显著提高莴苣植株的生物量,但植株的根冠比和含水量增加;降低了低氧条件下莴苣植株中丙二醛含量;显著提高了莴苣植株中多种矿质养分和有机组份的含量。结论 30 kPa低压并不能显著促进莴苣生长,但可以提高莴苣抵抗低氧逆境的能力和植株的营养品质。
Objective To cultivate plants under low pressure and explore the effects of low pressure and hypoxia on plant growth and nutritional quality. Methods Lettuce plants pre-cultured for 15 days were subjected to 20-day growth at 2 total pressures (101 and 30 kPa) and 3 oxygen partial pressures (21, 6 and 2 kPa). Results Under the two total pressures, reducing the partial pressure of oxygen (6 or 2 kPa) significantly inhibited the growth, biomass, root / shoot ratio, water content, mineral nutrients and organic components of lettuce (vitamin C, crude protein and crude Fat) and carotenoid content decreased significantly; but chlorophyll content and MDA content increased significantly. Under the same oxygen partial pressure, the total pressure drop (30 kPa) did not significantly increase the biomass of lettuce plants, but the root-shoot ratio and water content of plants increased; the content of malondialdehyde in lettuce plants under hypoxia was significantly reduced The lettuce plant a variety of mineral nutrients and organic components content. Conclusion Low pressure of 30 kPa can not significantly promote the growth of lettuce, but can improve the ability of lettuce to resist hypoxia stress and the nutritional quality of plants.