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为探讨果实内源多胺对温度胁迫的响应及其与果实膨大之间的关系,以薄皮甜瓜(Cucumis melo L.)‘玉美人’为试材,研究了不同夜间温度对果实膨大及内源多胺含量的影响。结果表明,12℃处理的单果质量、果实横径、纵径最大,其次是15℃处理,18℃处理的单果质量、果实横径、纵径显著低于15℃处理,而9℃处理又显著低于18℃处理。从果实多胺含量变化情况看,除精胺外,果实总多胺、亚精胺、腐胺均随着果实的发育而减少,但不同夜温处理间存在差异,在夜温处理6d内的果实快速膨大期,腐胺、亚精胺、精胺和总多胺含量均是9℃夜温处理显著低于12℃、15℃和18℃处理,18℃处理又显著低于12℃和15℃处理,而15℃和12℃处理间无显著差异。腐胺、亚精胺、总多胺含量与单果质量增长率呈显著或极显著正相关。这些结果说明夜间温度对薄皮甜瓜果实膨大的影响可能与多胺含量的变化有关。
In order to investigate the response of endogenous polyamines to temperature stress and its relationship with fruit enlargement, the effect of different nocturnal temperature on fruit enlargement and endogenous Effect of polyamine content. The results showed that the fruit quality at 12 ℃, the diameter of the fruit and the vertical diameter of the fruit were the largest, followed by the treatment at 15 ℃. The fruit quality at 18 ℃, the fruit diameter and the longitudinal diameter were significantly lower than those at 15 ℃, while the treatments at 9 ℃ Below 18 ℃ treatment. From the changes of fruit polyamine content, except spermine, the total polyamines, spermidine and putrescine decreased with the development of fruit, but there were differences among different night-temperature treatments. The results showed that the contents of putrescine, spermidine, spermine and total polyamine were all significantly lower at 9 ℃ than at 12 ℃, 15 ℃ and 18 ℃, significantly lower than 12 ℃ and 15 ℃ at 18 ℃ ℃ treatment, but no significant difference between 15 ℃ and 12 ℃ treatment. Putrescine, spermidine, total polyamine content and fruit mass growth rate was significant or very significant positive correlation. These results indicate that the effect of night temperature on the enlargement of melon fruit may be related to the change of polyamine content.