病毒对苹果生理生化及生长结果的影响

Effects of Virus Infection on the Physiologicaland Biochem i- calCharacters of Apple Trees

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。

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.