关键词: 茎痘病毒, 潜隐病毒, 生长, 内源激素(包括GA₃、IAA、ZT和KT), 梨

Abstract: Two growing speeds and four endogenous hormones of pear seedlings, infected by stem pitting virus and ones free of virus, have been detected in this paper. The results show that growth of inoculated trees with SPV decreased significantly, compared with those free of virus. Among them, diameter and height of one year pear seedlings infected with SPV decreased by 11 and 13 percent respectively; trunk diameter, stem height and total shooting length of two-year pear trees infected with SPV decreased by 60, 23 and 44 percent respectively. Four endogenous hormone contents of the infected plants, including GA₃, IAA, ZT and KT, were all obviously lower than those in the healthy ones. Among them, GA₃, IAA, ZT and KT reduced by 24.6, 54.0, 96.8 and 85.2 percent respectively. All these results also suggested that the poor growth might be closely related to the sharp decrease of endogenous hormones after being infected by stem pitting virus.

Key words: STEM PITTING VIRUS, LATENT VIRUS, GROWING SPEED, ENDOGENOUS HORMONES (INCLUDING GA₃,IAA,ZT AND KT), PEAR