Experiment in low temperature adaptability of Del 100 cucumber variety

Using cucumber cultivated varieties Del 100 commonly as test material，which commonly used in Ningxia solar greenhouse cultivation；through the intelligent artificial climate chamber simulation facility in the production of three low-temperature environment，to measure the changes of four physiological and biochemical indexes--MDA，proline，electrical conductivity and superoxide dismutase under chilling injury situation. The results showed that：cucumber seedlings were less affected at 23℃/12℃ environment，followed by 23℃/9℃ environment，and cucumber seedlings were seriously damaged under 23℃/6℃ environment. Cucumber seedlings could tolerate for 6 days at 23℃/12℃ environment，at 23℃/9℃ environment they can withstand 4 days，and 2 days at 23℃/6℃. Cucumber seedlings have different recovery time under 23℃/17℃（ CK） after being treated by low temperature stress，the recovery of 6D was not obvious after being treated by 23℃/12℃. 4D recovery process was not obvious at 23℃/9℃. The recovery of 2D was not obvious after being treated by 23℃/6℃. The recovery of plants depends on the early impact of the degree of low temperature stress and stress time.