低温胁迫对茄子幼苗生理指标的影响

为研究低温对茄子幼苗生理指标的影响,以6份茄子高代自交系幼苗为材料,进行低温处理,前2d内白天15℃,夜间10℃,光照度4000lx,从第3天开始白天10℃,夜间7℃,光照度4000lx,再连续处理10 d.调查其耐低温性、POD活性、SOD活性、APX活性、脯氨酸的质量分数、MDA的质量摩尔浓度、根系活力等生理指标.结果表明：各材料的上述生理指标在常温下均差异不显著,而在低温处理下差异极显著；与对照相比较,幼苗POD活性、SOD活性、APX活性、脯氨酸的质量分数及MDA的质量摩尔浓度上升；根系活力下降,各指标的变化幅度与其耐低温性密切相关,耐低温性强的材料POD活性、SOD活性、APX活性、脯氨酸的质量分数上升幅度较大,MDA的质量摩尔浓度上升幅度较小,根系活力下降幅度较小,耐低温性弱的材料则表现相反.可见,低温使茄子幼苗的生长受到一定程度的抑制,但耐低温强的材料能够通过调节自身的生理指标来减轻低温的伤害,维持植物体的正常生长及代谢功能.

Effects of Chilling Stress on Biochemical Indexes of Eggplant Seedlings

The biochemical indexes under low temperature stress were studied, 6 materials were carried on low-temperature treatments, 15/10 ℃ in day/night for 2 days, 10/7℃ in day/night for 10 days. Several bio- chemical indexes such as the chilling tolerance, POD activity, SOD activity, APX activity, Pro mass fraction, MDA molalities, root vitality were investigated. The results indicated that there were no big differences among characters at normal temperature, while the differences were extremely significant among all characters at low temperature, CK~ indexes POD activity, SOD activity, APX activity, Pro mass fraction, MDA molalities in- creased, and root vitality decreased after the low temperature treatment, relationship of chilling tolerance with uplift-descent scale of indexes ranging were osculation, the decrease range of POD activity, SOD activity, APX activity, Pro mass fraction of high resisted materials were larger, the decrease range of MDA molalities of high resisted materials were smaller, the increase range of root vitality were smaller, weak resisted materials revealed contrary trend. The growth of eggplant seedlings was negatively influenced by low temperature stress, but the high resisted materials could adjust themselves to avoid low temperature harms by regulating protective enzyme system, which led to some tolerant ability of eggplant to low temperature conditions.