关键词: 苹果无病毒和带病毒品种, 光合作用, 矿质元素, 产量, 苹果

Abstract: The studies of photosynthesis, growing and fruit-setting properties reveal initiatively that the photosynthesis output, the total photosynthesis strength and the fruit yield of virus-free apple varieties are significantly higher than virus-infected varieties. How ever, the net photosynthesis of virus-infectde varieties tend tobe higher than that of virus-free varieties. In four virus-free apple varieties, the photosynthesis strength of variety 74-42 is the highest and FuJi's photosynthesis strength is the lowest, and that of Red starking and Golden Delicious is between 74-42 and FuJi's. The Fe, Cu, Mn and Ca contents of fruits are lower than normal in this study, but the Zn content is much higher than normal. Only the Ca content reveals virus-free fruits higher than virus-inrected fruits.

Key words: VIRUS-FREE AND VIRUS-INFECTED APPLE VARIETIES, PHOTOSYNTHESIS, ELEMENT, YIELD, APPLE