关键词: 番茄, 耐热性, 多胺

Abstract: The changes of endogenous polyamine levels induced by high temperatures were investigated in tomato plants with diferent heat-tolerance. Plants were treated at temperatures of 25／20oC (day and night)，33/25 ℃ and 38/28℃ at seedling or blooming stage. The results showed that the levels of spe rmidine and spermine in heat-tolerant varieties significantly increased with increase of growing tempe rature． and the maximum was observed at 38/28℃．In contrast， in heat-sensitive varieties，the highest levels of spermine and spermidine occurred at 33/25℃. The temperature treatment of 38/28℃ remarkedly decreased spermine and spermidine contents both in leaves
and flowers compared with 33/25℃ in heat．sensitive varieties．The putrscine content showed no regular changes both in temperature treatments and varieties. The involvement of polyamines in tomato heat tolerance is discussed.

Key words: Tomato, Heat-tolerance, Polyamine