不同供气条件对水培黄瓜幼苗生长的影响

Effects of Different Air Supply Conditions on Cucumber Seedling Growth under Hydroponic Culture

以黄瓜品种冬雪棚丰6号为试材，以营养液充气水培为对照，研究了在营养液不循环、不充气的条件下，通过调整定植板与营养液面间的距离，研究其对黄瓜幼苗形态指标、根系活力及抗氧化酶活性的影响。结果表明：营养液不充气且定植板漂浮于营养液面的处理，在苗期即出现了低氧胁迫症状，其植株生长量及根系活力均比对照明显降低，根系超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）活性及丙二醛（MDA）含量均高于对照；营养液不充气，将定植板抬离营养液面约3～5cm的处理，苗期基本无低氧胁迫现象，其形态指标、根系活力和抗氧化酶活性都接近于对照，表明定植板与营养液面保持一定距离，使部分根系暴露于空气中，避免了营养液不充气造成的缺氧伤害。

Cucumber cultivar Dongxuepengfeng 6 was used to study the effects of different hydroponics systems on the growth of cucumber seedlings. The morphological indices, root activity and antioxidant enzyme activities of cucumber seedlings were analyzed under different treatments. The results showed that： the seedlings appeared the symptoms of hypoxia stress under the hydroponics system with no air insufflation and the planting board floating on the surface of nutrient solution ; the seedling growth and the root activity were significantly decreased,while the activities of SOD, POD, CAT and the content of MDA were significantly higher than those of control. The treatment which kept a space （ about 3 - 5 cm） between the planting board and the nutrient solution surface with no air insumation could alleviate the hypoxia stress to cucumber seedlings and had the similar morphological indices, root activity and root antioxidant enzyme activities with control.