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以烤烟(Ｎｉｃｏｔｉａｎａ ｔａｂａｃｕｍ)Ｋ３２６为材料,研究了低温诱导下烟株顶芽发育及顶芽内激素含量的变化,研究结果表明烤烟(Ｋ３２６)到第６片真叶时才对低温敏感,而低温诱导只有持续到７叶期才能维持低温诱导的结果。各处理的烟苗４~１０叶期顶芽的组织解剖特征没有明显差异,都处于营养分生组织阶段。但低温诱导影响了顶芽内几种激素的变化,苗期烟草顶芽内ＺＲｓ含量极低;各处理的烟苗在低温诱导期间,顶芽内ＩＡＡ含量低于对照,低温诱导结束后,ＩＡＡ含量高于对照,对照和６叶期前低温处理的烟苗顶芽内ＩＡＡ变化不大,低温诱导到６叶、７叶、８叶、９叶、１０叶的各处理顶芽内ＩＡＡ含量在７叶期出现高峰;对照和低温诱导到７叶期前的各处理顶芽内 ＧＡ３含量在６叶期出现峰值,低温诱导到７叶及７叶以后的各处理在６~７叶出现峰值,且在８叶之前ＧＡ３含量高于对照;ＡＢＡ的峰值出现在８叶期,低温诱导使顶芽内ＡＢＡ升高。
Tobacco (Nicotiana tabacum) K326 was used to study the development of the terminal buds and the contents of hormones in the apical buds of tobacco plants under low temperature. The results showed that the flue-cured tobacco (K326) Induction results in hypothermia induction only up to the 7-leaf stage. There was no significant difference in the anatomical characteristics of the apical buds between 4 and 10 leaf stages of the treated tobacco seedlings, all of which were in the vegetative meristem stage. However, the induction of low temperature affected the changes of several hormones in the apical bud, and the content of ZRs in the apical bud of seedlings was extremely low. During the induction of low temperature, the content of IAA in the apical bud was lower than that of the control. After the induction of low temperature, IAA The contents of IAA in the top buds of the control and 6-leaf low-temperature treatment did not change much. The IAA content of the 6-leaf, 7-leaf, 8-leaf, 9-leaf and 10- 7 leaf stage appeared peak; control and low temperature induced to 7 leaf stage before treatment GA3 content in the top bud peaked at 6 leaf stage, low temperature induced to 7 leaves and 7 leaves after the treatment of the peak in the 6 to 7 leaves, The content of GA3 was higher than that of the control before 8 leaves. The peak of ABA appeared at the 8-leaf stage, and the ABA of the top bud was induced by low temperature.