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Temperature and light are the necessary conditions for plant growth and development, in the the vegetable counter-season cultivation process, temperature, light and often become the main environmental factors that hinder the facility cultivation to increase production, improve quality, efficiency. This trial one of the modern greenhouse cultivation of vegetables types of cucumber as test material mainly consists of two parts: First, learn the methods and results of previous studies based on greenhouse cultivation, the use of ventilation and cooling and heating measures temporary common in the the simulated sunlight greenhouse in winter and spring production of low-temperature low-light environments, from of cucumber morphology, photosynthesis, yield, quality and other aspects discussed the cucumber growth characteristics and adaptation mechanisms in low-temperature low-light conditions, to Cucumber Greenhouse and resistance The low temperature and poor light breeding provide a theoretical basis. Second, for the chilling under low light factors affect the growth, yield and quality of cucumber in the facility cultivation process chilling under low light regulation effect cucumber resistance provide reliable guidance of agricultural production, research exogenous brassinosteroid (BR) theoretical basis. The test results are as follows: 1 Low Light on cucumber growth, yield, quality has a significant influence. the test temperature and light conditions of low temperature and low light can significantly affect plant height, leaf area, dry matter growth. Processing of the same light intensity at different temperature, cucumbers plant height, stem diameter, leaf area, dry matter increase as the temperature decreases significantly reduce; processing temperature the same, with the weakening of the light intensity, cucumber plant height also an increasing trend, while the stem diameter, leaf area, dry matter showed a downward trend in the low-temperature low-light conditions. Adversity processing time longer, to increase or degree of inhibition of the more significant. b. Low Light, tested varieties of cucumber leaf net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance degrees (Gs), intercellular CO. Concentration (Ci) were significantly lower. The photosynthetic characteristics slightly different between the varieties of six for the test, Green Island One, 3 Feng crown, and vegetable spring new beyond no significant decline in photosynthesis in low-light conditions. c. processing the light intensity is the same at different temperatures, the cucumber varieties yield decreases as the temperature decreases; treatment temperature is the same, with the weakening of the light intensity, the yield of cucumber showed a decreased tendency to reduce the amplitude difference is not significant. Hypothermia cucumber cut effect is greater than the low light, slightly different performance between the various varieties. d under the experimental conditions, the low temperature and low light significantly affect the the cucumbers quality, deal with the same light intensity at different temperature, the cucumber varieties soluble proteins, organic acids increases as the temperature decreases, soluble solids, soluble sugar, vitamin c content changes in the trend is the opposite; processing temperature the same, with the weakening of the light intensity, cucumber soluble protein, organic acids, soluble sugar content showed an increasing trend to increase the magnitude of the difference was not significant, soluble solids, vitamin c content tended to decrease. 2 different varieties of cucumber production the different adversity adaptation of the chilling and low light. Below the North China type in the overall yield of this test in the South China Type cucumber, cucumber varieties tested the South China, Kyrgyzstan hybrid fourth-resistant low-light and strong, Green Island No. 1 low temperature resistance; North China cucumber varieties vegetable spring new beyond a certain degree of resistance to a single low-temperature, low-light conditions. On the whole, the 3 Feng crown, in the low-temperature, low light and low temperature composite low-light conditions to perform well, the high and stable production, it is recommended that in the region to promote 3. Exogenous brassinosteroids can effectively alleviate cucumber seedlings at low temperatures Low Light Stress under the injuries. The test in the same period, with different concentrations of exogenous brassinosteroid (BR) induced cucumber seedlings to study chilling under low light stress and restore the growth stages BR resistance of cucumber seedling chilling under low light. The results showed that the chilling under low light stress or duress after BR treatment cucumber seedlings, both can increase the activity of antioxidant enzymes, increase the chlorophyll content, lower malondialdehyde content, thereby reducing plant stress in the low-temperature low-light suffered damage.
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