CAJ | 학술논문

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。
위탐토봉협락지생근(Kalanchoe tubiflora)내한적궤제，재간한여복수조건하，대기협편적일사생리생화지표진행료측정。결과표명，수간한시간연장，봉협락지생근협편중O2-·생성속솔증대，H2O2함량승고，도치지질과양화산물MDA함량증고；동시SOD활성승고，CAT활성강저；가용성당여포안산함량증가，단복수후저사지표균회복도간한전적수평。저설명봉협락지생근능구내수간한배경시통과적루삼투조절물질，제고활성양적청제능력，종이감소양화협박조성적상해。
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-· 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.