The Effects Of Ultraviolet-B Radiation Intensity And Different Plasic Film On Development Characteristics Of Peach Flower And Fruit In Protected Culture

The experiment had been carried out in college of horticulture science and engineering, Shandong Agriculture University from 2007 to 2008 with Four-year-old kansu peach'Taiwan farmers sweet'(Prunus persica cv.tainongtianmi) in solar greenhouse. The effects of different UV-B radiation intensity on development characteristics of flower and fruit in greenhouse and the effects of different film on light and temperature condition and fruit quality were studied. The main results were as follows:1,It was more significantly inhibitory effect on shoot growing by UV-B radiation, the shoot length of T1, T2, T3 were CK's 47.49%, 37.20%, 44.79%; Reduced the bud water content; Promoted the accumulation of dry matter content; The single bud weight of T1,T2,T3 were heavier 48.97%, 54.17%, 50.83% than CK; Improved the pollen germination rate, hindered the pollen tube length, The pollen tube length of T1, T2, T3 were shortter 103μm,44μm,18μm than CK; Decreased the content of ZT,GA3,IAA of bud endogenous hormones, improved the content of ABA; was more conducive to improve mean single fruit weight, promoted the growth of polar and suture diameter; Improved the content of soluble suger, reduced the content of titratable acid content, improved sugar acid ratio, There were no significantly effect on starch content, Inhibited the synthesis of protein; decreased chlorophyll content in peel, was beneficial to the accumulation of anthocyanin content in peel. It was helpful to improve fruit quality by enhanced UV-B radiation in greenhouse.2,Through the different treatment of UV-B intension, under the UV-B intension of treatment T2(1.44kJ·m-2·d-1),the shoot length of peach was inhibited significantly,the growth was only 37.20% of the control .Under this treatment, it could also promote the pollen germination rate of peach,benefit to the accumulation of nutrient in the peach, promote the fruit coloration and improve the quality of peach in the greenhouse.So we could conclusion that in the protected cultivation of fruit trees,we could supplement UV-B ratiation at a suitable amount .3,During the course of fruit developing and maturating,the effects was significant different between coated-anti-fog film and inner-added anti-fog film at environmental conditions. The coated-anti-fog film had better UV-B transmittance, insulation and moisture retention,it could provide a good environment for the vegetative and reproductive growth of peach in greenhouse.4,During the course of fruit developing and maturating,it also had significant different effects at the quality of peach in greenhouse between coated-anti-fog film and inner-added anti-fog film. Coated-anti-fog film was more conducive to promote the growth of the fruit, benefit to the accumulation of soluble sugar, reduce the synthesis of organic acids and improve sugar acid ratio, but went against the synthesis of protein. In a word, coated-anti-fog film was more conducive to improve the comprehensive quality of the fruit.