茄子幼苗耐低温性生理机制的研究  

Studies onphysiological mechanism of eggplant under low temperature stress

作　　者：吴雪霞[1] 杨晓春[1] 查丁石[1] 朱宗文[1] 许爽[1] 

机构地区：[1]上海市农业科学院园艺研究所,上海市设施园艺技术重点实验室,上海201403

出　　处：《上海农业学报》2013年第5期45-49,共5页Acta Agriculturae Shanghai

基　　金：上海市科技兴农重点公关项目[沪农科攻字(2009)第2-1号];上海市自然科学基金项目(ZR1426800);现代农业产业技术体系建设专项资金资助

摘　　要：以5份耐低温性不同的茄子幼苗为材料,研究了低温胁迫对其冷害指数、生长指标和生理指标的影响。结果表明:(1)低温胁迫后,5份材料生物量(株高、茎粗和地上部鲜重)积累均受到显著抑制,耐低温材料的受抑制程度小于低温敏感材料;(2)低温胁迫下5份材料叶片的丙二醛(MDA)含量、超氧阴离子(Ο_2·-)产生速率、超氧化物歧化酶(SOD)、过氧化物酶(POD)活性及脯氨酸和可溶性蛋白含量均显著上升;耐低温材料的MDA含量、Ο_2·-产生速率的增加幅度小于低温敏感材料,SOD、POD活性的增加幅度大于低温敏感材料;脯氨酸和可溶性蛋白含量的增加幅度变化不规律;(3)茄子的耐冷性与茎粗、地上部鲜重降低值、叶绿素含量、SOD和POD活性均呈显著负相关;与MDA含量、Ο_2·-产生速率均呈显著正相关;与株高的降低值、脯氨酸和可溶性蛋白含量无显著相关。以上结果表明,低温胁迫使茄子幼苗的生长受到一定程度的抑制,但耐低温材料能够通过调节自身的保护酶系统活性来减轻低温胁迫的伤害,维持植物体的正常生长及生理代谢功能。Effects of low temperature stress on the chilling index, the growth and physiological in- dexes of five eggplant seedlings with differentlow temperature resistance were studied. The results showed that（l）all the biomass production （plant height, stem diameter and shoot fresh weight）of five materials were significantly inhibited under low temperature stress, and the inhibition degree of low temperature resistant materials were less than that of low temperature sensitive materials; （2）contents of malondialdehyde（MDA）and O2·-producing rate, activities of superoxide dismutase（SOD）and per- oxidase（POD） ,contents of proline and soluble protein in the leaves were significantly increased; the MDA content and O2·- production rate of low temperature resistant materials increased less than that of low temperature sensitive materials, the SOD and POD activities increased more than that of low temperature sensitive materials;the content of proline and soluble protein increased irregularly; （3）the chilling index of eggplants were significant negative correlation with the decrease ratio of stem diame- ter and shoot fresh weight, contents of chl, SOD and POD activities;the chilling index of eggplants were significant positive correlation with contents of MDA and O2·- producing rate;the chilling index of eggplants were not significant with the decrease ratio of plant height,contents of proline and solu- ble protein. The above results showed that the growth of eggplant seedlings were inhibited under low temperature stress, but the low temperature resistant materials could regulate the activity of enzyme system to alleviate the damage of low temperature stress and maintain normal growth and physiologi- cal metabolism in plants.

关 键 词：茄子幼苗 耐低温 生理机制 

分 类 号：S641.1[农业科学—蔬菜学] S601[农业科学—园艺学]