UV-B辐射对设施桃结果枝同化物转运和分配的影响  

Effect of UV-B Radiation on Assimilate Translocation and Distribution in Fruiting Shoot of Protected Peach

作　　者：于妮娜[1] 李冬梅[1] 谭秋平[1] 张海森[1] 高东升[1] 

机构地区：[1]山东农业大学园艺科学与工程学院,泰安271018

出　　处：《应用与环境生物学报》2013年第1期157-163,共7页Chinese Journal of Applied and Environmental Biology

基　　金：山东省优秀中青年科学家科研奖励基金(BS2011NY011);"十二五"国家科技支撑计划项目(2011BAD12B02);山东省水果创新团队项目资助~~

摘　　要：以6年生设施栽培‘春捷’毛桃(Prunus persica cv.Chunjie)为试材,设对照和补充UV-B辐射的低、中、高剂量3个处理,在果实成熟后对果实单果重、可溶性固形物含量和可溶性糖含量进行测定;在果实发育不同时期饲喂14C标记的CO2,并采样由中国科学院原子能利用研究所对样品14C放射性活度(cpm值)进行测定;研究了不同剂量UV-B辐射对设施桃树果实不同发育时期光合碳同化产物转运和分配特性的影响.结果表明:(1)果实膨大期,碳同化物向果实中分配比例最高的是低强度辐射处理,达到54.67%,向营养器官中分配比例最高的是中强度处理,为58.98%;硬核期,果肉对碳同化物的竞争能力最强的是高强度处理,分配比例为31.73%;果实着色期促进碳同化物向果肉中转运的效果最显著的则是中强度处理,分配比例达到87.88%.(2)通过补充外源UV-B辐射,设施桃果实单果重、可溶性固形物含量及可溶性糖含量均有显著提高.综上,光合碳同化物在设施桃树各器官中的转运和分配受果实发育时期影响;补充UV-B辐射可以增强果实对光合碳同化物的竞争能力,从而导致光合碳同化物在果实中的分配比例增加.This study was conducted on six-year-old greenhouse-grown ＇Chunjie＇ peach trees （Prunus persica cv. Chunjie） to investigate the effects of UV-B radiation on ~4C-assimilate translocation and distribution in fruiting shoot. The peach trees were treated with zero-（control）, low-, moderate- and high-intensity UV-B radiation. Single fruit weights, contents of soluble solids and sugars in ripe fruits were measured. Leaves were fed with t4C-labeled CO2 at the various stages of fruit development. Subsequently, leaves, fruits and branches were harvested to determine 14C radioactivity （cpm value） in collaboration with Institute of Atomic Energy, Chinese Academy of Science. The results were as follows： （1） During rapid expansion stage of fruit, 54.67% of the total tnc-assimilates were distributed to the fruit under low intensity radiation treatment. Medium intensity radiation treatment caused 58.98% of the total 14C-assimilates to influx into various vegetative organs. At hardcore stage, the competition of fruit treated with high intensity radiation for 14C-assimilates was the strongest （accounting for 31.73% of the total assimilates）. At fruit coloring stage, the accumulation of the total 14C-assimilates （87.88%） in fruit was significantly observed under medium intensity radiation treatment. （2） Single fruit weight, soluble solid content and soluble sugar content of greenhouse-grown peaches were notably elevated. Finally, the translocation and distribution of 14C-assimilates in protected peaches appeared to be affected by the period of fruit development, and the ability to compete for 14C-assimilates increased in of C-assimilates. Fig 4, Tab 1, Ref 30 fruits supplemented with UV-B radiation that caused an increase in distribution 14 ＇C-assimilates. Fig 4, Tab 1, Ref 30

关 键 词：UV-B辐射 14C同化物转运 14C同化物分配 果实品质 设施栽培 桃树 

分 类 号：S662.1[农业科学—果树学] S628[农业科学—园艺学]