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Apricot (Armeniaca sp) is an important fruit trees. Almond trees bloom early, susceptible to late frost damage, apricot production has been stagnant. In this paper, 25 kinds and varieties of cold resistance, the main results are as follows: principal component analysis, cluster analysis, nine ecology, metabolism and physiological and biochemical indicators of Cold Hardiness of 25 apricot cultivars comprehensive evaluation , the discharge the cold hardiness sequence, pointed out that the main factor for cold identification cold resistance identification model: Y = -10.5600 0.2152X 1 -0.0369X 3 0.1076 X 4 0.2519X 7 -0.0634X 8 0.0229X 9 (X 1 , X 3 < / sub>, X 4 , X 7 , X 8 , X 9 SOD activity, MDA content , soluble protein content, anthocyanin, semi-lethal temperature, xylem ratio). Autumn and winter cold acclimation, January the Cold Hardiness force up to the level of real cold. Cold hardiness of branches of different organizations from weak to strong: the marrow lt; forming layer lt; the primary xylem lt; secondary phloem lt; secondary xylem lt; primary phloem. Spend the different organs browning rate the size of the petals the lt; stamens lt; pistil, flower organ browning temperature of -4 ° C to -5 ° C. Low temperature stress of the membrane system damage. Less cold and strong species, varieties conductivity and MDA content, SOD, POD enzyme activity higher. Low temperature can induce the synthesis of ABA from -1 to -5 ° C floral organ ABA content was 2 times higher. 0 to -4 ° C the floral organs soluble protein content increased, -5 ° C when the content is reduced. Identified four varieties of floral organs supercooling point. To excellent - petals, pistil supercooling lowest point, to -5.9 ° C -4.7 ° C. The supercooling point speculated Cold Resistance gifted a gt; BEST flat gt; the swarm gt; Longwangmao. Apricot Cold Resistance and its morphology properties. The twig xylem higher the percentage, the greater the value of the blade CTR, smaller blades porosity, cold hardiness, the stronger. LT 50 measurements show that the cold resistance of different organizations: 1 year old dormant branches gt; bud gt; blooming flower gt; young fruit, petals gt; the stamens gt; the pistil, pulp gt; embryo. Apricot 1 year old sleep branch, bud, flower and the young fruit LT 50 exists correlation bud LT 50 and branches, flower, young fruit the LT 50 is high, and can be determined by measuring the apricot buds LT 50 to apricot cold hardiness.
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