病毒对苹果生理生化及生长结果的影响

对感染混合潜隐性病毒的富士、金冠苹果树进行了生理生化及生长结果指标检测，结果发现，与品种脱毒树相比，在生理生化方面：病毒树内含物质ＧＡ３、ＣＴＫ、ＩＡＡ、ＲＮＡ 和蛋白质含量降低，ＤＮＡ含量升高；总光合强度及净光合强度下降，呼吸强度升高。在生长结果方面：病毒树的树高、干径、冠径和一年生枝长度减弱，坐果率和产量降低；果实可溶性固形物、总糖、还原糖及Ｃａ、Ｆｅ、Ｍｎ 含量下降，果肉硬度降低

Effects of Virus Infection on the Physiological and Biochemical Characters of Apple Trees

The effects ofthree latentvirus infections (CLSV, SGV and SPV) on the physiological and biochem ical characters of apple trees, on the grow th fruiting, yield and fruit quality w ere studied. The results show ed thatthe contents ofthe gibberellin (GA3), cytokinin(CTK),indole- 3-acetic acid (IAA), RNA and protein ofthe virus-infected apple trees w ere low er than the virus- free ones. In the virus-infected apple trees, the totalphotosynthesis rate and net photosynthesis rate w ere less than those ofthe virus-free apple trees. Butthe contentsofDNAin the virus-infect- ed apple trees w ere higherthan in the virus-free ones and also their respiration ratew ere stronger. The am ount ofgrow th for the virus-infected trees, including tree height, diam eter of trunk and canopy, yearly grow th of branches from one to five years w ere all w eaker than the virus-free trees. The fruit set and yield for the virus-infected trees w ere less than those of the virus-free trees. The flesh firm ness w as decreased too.