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Supercooling point, as test materials, test Baoding 10 kinds of early spring flowering plants accurately simulate the natural cream night cooling the artificial simulation frost box of each plant was measured at different developmental stages petals with cream box its low-temperature processing, Determination of electrolyte leakage rate, combined with the logistic equation lethal temperature statistics browning rate thereby sort their cold hardiness; triloba triloba (Amygdalus triloba (Lindl.) Ricker), the hickory (Amygdalus davidiana), Spring (Jasminum nudiflorum ) as test materials, comparative study of low temperature stress on antioxidant enzyme activities of the three kinds of early spring flowering plants flowering petals, Osmotic Adjustment Substances; Ying red rhododendron (Rhododendron mucronulatum), Spring Prunus, as test materials, comparative study of 3 species of early spring flowering plant in the low temperature Xiexia pigment content, color and related enzymes change, aimed at the production and cultivation of flowering plants, the use of resources to provide a theoretical basis for the early spring. The results show that: with the development process goes on, the 10 kinds of early spring flowering plants arrogant bud stage to flowering supercooling point found significantly increased electrolyte leakage rate performance for flowering gt; the early flowering gt; big bud stage, shows that with the developmental process goes on 10 kinds of early spring flowering plant hardiness diminishing order of cold resistance performance large bud stage gt; the early flowering gt; flowering stage; supercooling point lower, the stronger cold resistance, integrated 3 developmental stages of flowering plants, 10 kinds of early spring supercooling point, electrolyte leakage rate, semi-lethal temperatures (LT50), the results showed that 10 kinds of early spring flowering plant the cold hardiness order for Spring gt; R. mucronulatum gt; forsythia (Forsythia suspensa) gt ; the hickory the gt; Magnolia (Magnolia denudata) gt; Lagenaria (Chaenomeles speciosa) gt; plena flowering plum (Amygdalus triloba f the multiplex) gt; Admiralty gt flowers Forsythia viridissima; Betau (Prunus persicacv.Duplex) gt ; flowering plum. Flowering plum, Prunus, Yingchun petals soluble protein, soluble sugar, proline content in the low-temperature processing basic first increased and then a downward trend. Spring petal soluble protein content at different temperatures are higher than the hickory and flowering plum; Spring petals proline, soluble sugar content in the lowest temperature peak; cold treatment, three kinds of early spring flowering plant petals soluble protein, soluble sugar, proline The acid content of the basic rendering first increased and then decreased. As the the processing temperature drops, the three kinds of early spring flowering plants O 2 - generation rate, MDA content showed a rising trend, the same temperature O 2 - generation rate, MDA content of the performance for the flowering plum gt; the hickory gt; Spring; close relationship between the relative conductivity, MDA content and oxygen radical generation rate was significant or very significant positive correlation. Low-temperature treatment, three kinds of early spring flowering plant petals brightness L * value showed a gradual downward trend, and the temperature is lower, the trend is more obvious; as the temperature dropped, of R. mucronulatum suit to red, blue direction conversion to blue the hue transformation mainly, winter jasmine color into green, yellow direction, the conversion to green tone, the hickory color to red, blue direction transformation, the transformation to the red hue; Mountain Peach Blossom anthocyanin content and PAL enzyme was positively correlation, the R. mucronulatum flavonoid content and activity of CHI was positively correlated, the the Yingchun correlation was not significant.
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