摘要
为探讨棒叶落地生根(Kalanchoe tubiflora)耐旱的机制,在干旱与复水条件下,对其叶片的一些生理生化指标进行了测定。结果表明,随干旱时间延长,棒叶落地生根叶片中O2-·生成速率增大,H2O2含量升高,导致脂质过氧化产物MDA含量增高;同时SOD活性升高,CAT活性降低;可溶性糖与脯氨酸含量增加,但复水后这些指标均恢复到干旱前的水平。这说明棒叶落地生根能够耐受干旱环境是通过积累渗透调节物质,提高活性氧的清除能力,从而减少氧化胁迫造成的伤害。
In order to understand the mechanism of drought tolerance in Kalanchoe tubiflora, some physiological and biochemical indexes in K. tubiflora leaves were determined under drought and rewatering conditions. The results showed that O2-＆#183; production rate, and H2O2 and malonaldehyde （MDA） content increased with prolonged droughts, and the contents of soluble sugar and proline, as well as SOD activity enhanced, while CAT activity reduced. All of these could restore to the level before drought under rewatering treatment. In conclusion, it was suggested that K. tubiflora tolerate drought stress by accumulation of osmoregulators, improving capacity of active oxygen scavenging, thus reducing the damage caused by oxidative stress.
出处
《热带亚热带植物学报》
CAS
CSCD
北大核心
2014年第4期391-398,共8页
Journal of Tropical and Subtropical Botany
基金
云南省教育厅科学研究基金项目(2010Y216)资助
关键词
棒叶落地生根
干旱
抗氧化酶
渗透调节
Kalanchoe tubiflora
Drought
Antioxidant enzyme
Osmoregulation
