Study On Some Biological Characteristics And The Mechanism Of Cold Resistance During Blossom Of Kernel-apricot

The paper commences from some actual problems on culture and production use Long Wang-Mao,You-yi,Mu Gua-xing as the experimental material, the paper conducts a survey on the biological feature of this three kinds of plants. At the same time, the paper also uses mulching ,this two dealing ways to do a research on the methods of elevating the rate of complete flower of Kernel-apricot. Setting You-yi as the material, the paper conducts a research respectively before and after the flowering period of Kernel-apricot on the variations of such biological standards as soluble sugar,free proline,soluble protein,MDA,SOD,POD, meanwhile, the author measures during the flower-blossoming and fruit-forming time the cooling point of the flower organ after the dealing of SA, following an experiment of low-temperature threatening, and then measures the internal biological entities which has mentioned above. The conclusion shows: (1) the flowering time of this three kinds of Kernel-apricot varies, with Mu Gua-xing the longest and Long Wang-Mao the shortest.(2) the highest complete flowering rate comes from Mu Gua-xing, the lowest You-yi, and all the three sorts see their highest fruit-accumulating rate in short branches and flower bunch like branches.(3) the most suitable density of the sugar cultivating liquid for the springing of the flowering powder of Mu Gua-xing and You-yi is 10%, while Long Wang-Mao is 15%. All the three kinds have a low rate of natural flower powder receiving and fruiting, with an average of 8.2%.all are self-infertile. (4) Ground covering can extend and prolong the flowering period thus elevate the rate of complete flower. (5 During the process from dormancy to fruit-forming period, the content of free proline and soluble protein in the xylem and cortex-phloem decreased gradually. The content of these two physiological indexes reached the peak on April the 12th, respectively in the flower organs. The content of soluble sugar increased in the flower organs while decreased in the cortex-phloem. The change of MDA in different location of short branches of Kernel-apricot was quite similar. They all appeared only one peak during the process of blossom. But the peak of MDA content of flower organs came the latest of the three. SOD activeness increased first and decreased later, reached the peak on April the 5th, April the 12th . POD activeness gradually became weaker,except the dramatically went up in the flourishing blooming period.(6)assuming the condition of momentary low temperature, the flower organ of Kernel-apricot can improve its ability of coldness resisting by heightening the amount of soluble sugar, free proline, soluble protein and POD activeness, while SA improves its coldness resisting ability by elevating the vigor of he activeness of certain enzymes related with oxidation in the flower organ during the full blossom flower time...