关键词: 番木瓜, 环斑花叶病毒, 可溶性蛋白, 还原糖

Abstract: An experiment was conducted to analyze the dynamic process of soluble protein and reducing sugar contents in papaya plants infected by Papaya Ring Spot Virus (PRSV), and their relationships to disease resistance. The results showed that peak value of the percentage of changes in soluble protein content in susceptible variety(‘Ling nan zhong’) appeared earlier and greater than that in resistant one (‘Shui zhong hong-48’) after inoculated with PRSV; as to the former, when the peak appeared at 24h after inoculation, its value was 54.6%, while the later, when the peak appeared at 48h, its value was 38.2%. The soluble protein bands appearing in uninoculated susceptible variety were one more than those in resistant one. But at early stage of infection by PRSV (at 24h after inoculation), the bands in resistant variety were one more than those in susceptible one, its Rf value was 0.602. The peak of percentage of changes in the reducing sugar content in resistant variety was at 48h after inoculation and the value was 12.3%. But the percentages of change in the reducing sugar content in susceptible variety were all negative after inoculation.

Key words: papaya, PRSV, soluble protein, reducing sugar