Studies On Propagation Technology Of Crabapple

This paper carried out a research of crabapple on seed dormancy mechanism , dormancy break method, the growth process of the annual seeding height and root foot-diameter for seed sowing and breed technology in cuttage , etc. The results shown as follows:1. The dormancy mechanism of seedThe seed coat mechanical obstruction of Mains robusta and M. baccata has effectless on dormancy of seed, bad ventilation of seed coat has certain influence to the germination of the seed. Germinaiton inhibitors in seed coat is one of the reasons which causes the dormancy of M.robusta seed. M.robusta and M. baccata seed is plump. The form of embryo is ripe. It does not have a kind of embryo with after-ripening form phenomenon . The main reason of dormancy of seed of M.robusta is the germinaiton inhibitors in the embryo. Through this study, it is concluded that the balance of GA, ZR and ABA in seed of M.robusta influence dormancy and germination.2. The method to break dormancyRegard M.robusta as test the material , It can't break the seed dormancy totally with GA solution to soak seed . It is effectual to breaking the dormancy of seed that low temperature stratification. The dormancy of seed of M.robusta is broke if stratified for 80 days. Naked stratification is accumulated and sand stratification is accumulated and equate the result which removes the dormancy of seed, but naked stratification accumulates change of the external environment sensitivly, The stratification keeps up with stability of the external environment, low temperature sand stratification of pretreatment of GA solution is obvious to shorten stratification time (shorten 20 day than that of sand layer), and its germination percentage, tendency of sprouting and germination index is higher than the corresponding index of sand stratification.3. Annual Growth Dynamics of One-year-old SeedingsThe growth process of the annual seeding height of M.robusta presents the rhythm of Slow - Fast -Slow-Fast-Slow". The growth process can be fitted into two 'S' shape curves. It's as follows:Seeding height growth and collar diameter growth are relevant, are fit for curves of cubic polynomial. It is:Y=-13. 373+182. 705x-304. 04x2+192. 747x3 (R2=0. 987)The grown is in close relation with ecological factor , The multivariate regression analysis indicated that the temperature is the main factor in influencing the growth of seeding height. It is great that the border condition in influencing the seeding height. 4. Breeding technology in cuttageThe author deals with breeding technology in cuttage from cuttage time , cutting type, hormone ,etc. Attempt to put forward an effective cuttage method , but every method result is not good.