论文部分内容阅读
针对宁夏地区日光温室冬春茬蔬菜栽培中经常出现低温导致产量品质下降问题,以温室常用黄瓜品种“德尔99”“德尔99”嫁接苗、“德尔100”幼苗为试材,根据宁夏冬季温室温度变化,设定处理温度为23℃/6℃(昼温/夜温)和23℃/17℃恢复(同时为对照)进行智能人工气候箱模拟,低温胁迫分别持续2、4、6、8、10d后恢复2、4、6d,测定不同低温和恢复期黄瓜幼苗中丙二醛含量、相对电导率、脯氨酸含量和超氧化物歧化酶(SOD)活性,旨在探究黄瓜幼苗在低温条件下的适应性和耐受期,为筛选适宜当地日光温室冬春季种植的黄瓜品种提供依据。结果表明:3个黄瓜品种的幼苗在低温胁迫下均出现不同程度的伤害,“德尔99”和“德尔100”黄瓜幼苗能耐受6℃低温胁迫2~4d后恢复状态,“德尔99”嫁接苗低温胁迫8~10d后恢复正常生长;采用隶属函数综合评价3个黄瓜品种幼苗抗寒性强弱为“德尔99”嫁接苗>“德尔100”>“德尔99”。
In order to reduce the yield and quality of the winter and spring vegetable cultivation in solar greenhouse in Ningxia, low temperature led to the decrease of yield and quality. In this study, the common cucumber variety “Del 99”, “Del 99” grafted seedlings and “Del 100” According to the temperature change of winter greenhouse in Ningxia, the artificial artificial climate chamber was set up to simulate the temperature of 23 ℃ / 6 ℃ (day temperature / night temperature) and 23 ℃ / 17 ℃ (control) After 4, 6, 8 and 10 days, the contents of MDA, relative conductivity, proline content and superoxide dismutase (SOD) activity in cucumber seedlings under different low temperature and recovery were determined. To explore the adaptability and tolerant period of cucumber seedlings under low temperature conditions, and to provide a basis for screening cucumber varieties suitable for winter and spring in the local solar greenhouse. The results showed that seedlings of three cucumber cultivars all suffered different degrees of damage under low temperature stress. The seedlings of “Del 99” and “Del 100” were able to tolerate 2 ~ 4 days after 6 ℃ low temperature stress, The grafting seedlings of “Del 99” were restored to their normal growth after 8 ~ 10 days of low temperature stress. The cold resistance of 3 cucumber cultivars was evaluated by the membership function. The “cold 99” grafting seedlings “Del 99 ”.