【作者】 滕开琼；

【导师】 杨秋生；

【作者基本信息】 河南农业大学 ， 植物学， 2000， 硕士

【摘要】 本文通过对樟科三种常绿阔叶树种（大叶楠、楠木、黑壳楠）在低温胁迫和施用外源脱落酸（ABA）处理下进行的O₂产生速率、MDA的含量和SOD、CAT活性水平变化的研究，结果表明：1．经ABA处理的大叶楠叶片的O₂产生速率、MDA的含量变化明显低于对照，而SOD、CAT活性明显高于对照，说明经ABA处理能提高植物的抗寒力。2．经ABA处理的楠木和大叶楠均能忍耐-50℃的低温，而黑壳楠至少能忍耐-10℃的低温，单就温度而言，黑壳楠更适于作为园林绿化植物引种。3．黑壳楠、楠木随着低温程度加大，植物幼苗叶片的衰老加速，表现在O₂产生速率增加、MDA含量增大、SOD活性下降等生理指标上。4．本试验表明，O₂产生速率、MDA的含量和SOD、CAT的活性等生理指标，能较好地反映植物幼苗耐低温的能力，可以作为鉴定植物抗寒性的生理指标。更多还原

【Abstract】 This paper studied the three aspects of seedling’s leaves of 3 broad-leaved evergreens in Lauraceae (1) the treatment of different low temperature; (2) the stress treatment of different time under the same low temperature; (3) the treatment of external ABA at the same time .It expounds the producing rate of Oz , the active level of SOD and CAT and the variety of MDA’s content. The results are followed.(1) The producing rate of O2 and variety of MDA’s content of Machilus Oichangensis leaf which were treated by ABA is lower than CK evidently but the active level of SOD and CAT is higher than CK thus the ability of chilling resistance of plants was increased.(2) By the treatment of ABA, the Phoebe Zhennan can endure -5癈 at least, but Lindera Megaphylla can endure -10C. For the temperature, the later is more suitable of introduction as gardens planting plant.(3) With the increment of the extent of low temperature, the aging rate of seedling’s leaf of Lindera megaphylla andphoehe zhennan also increase, the appearance is the increment of the producing rate of Ch and the content of MDA.(4) By correlation analysis, the producing rate of O2 the content of MDA and the activity of SOD are more adaptable index that are used to value the ability of chilling resistance of plant seedlings.更多还原