低温胁迫对4种景天属植物恢复生长后的生理影响

Effects of low temperature stress on the physiology in the recovery growth of four plants of sedum sp

以佛甲草、胭脂红景天、凹叶景天和中华景天4种景天属植物为试验材料进行人工低温处理(0,-3,-6,-9,-12,-15℃)24 h。低温处理后在20℃、相对湿度70%的人工气候箱内恢复生长15 d,再对其叶片各项生理指标进行测定。结果表明,恢复生长中,相对电导率由大到小依次是凹叶景天>佛甲草>中华景天>胭脂红景天;叶绿素由大到小依次是中华景天>胭脂红景天>凹叶景天>佛甲草;SOD活性由大到小依次是佛甲草>凹叶景天>中华景天>胭脂红景天;可溶性蛋白含量由大到小依次是佛甲草>凹叶景天>胭脂红景天>中华景天;MDA含量由大到小依次是佛甲草>凹叶景天>胭脂红景天>中华景天;脯氨酸含量由大到小依次是胭脂红景天>佛甲草>凹叶景天>中华景天。根据作者人工低温处理直接测定的结论,进一步论证了4种景天属植物抗寒能力依次为胭脂红景天>中华景天>佛甲草>凹叶景天。

The plants of Sedum lineare,S. spurium ‘Coccineum',S. emarginatum and S. hispanicum were treated with low temperature( 0,-3,-6,-9,-12,-15 ℃) for 24 h,then put in the artificial climate box with 20 ℃ and 70% of relative humidity and then the physiological indexes were tested.The results showed that in the recovery growth process,relative electric conductivity,from higher to lower,was S. emarginatum > S. lineare > S. hispanicum > S. spurium ‘Coccineum'. Total chlorophyll,in order,was S. hispanicum > S. spurium ‘Coccineum '> S. emarginatum > S. lineare. The order of SOD activities was S. lineare>S. emarginatum>S. hispanicum>S. spurium‘Coccineum'.Soluble protein content order was S. lineare>S. emarginatum > S. spurium‘Coccineum'> S. hispanicum. As for MDA content,the order was S. lineare > S. emarginatum>S. spurium‘Coccineum'> S. hispanicum. For proline content,the order was S. spurium‘Coccineum'> S. lineare >S. emarginatum>S. hispanicum. The cold resistance of S. spurium ‘Coccineum'and S. hispanicum were better than that of S. lineare and S. emarginatum. Combined with previous conclusions of low temperature treatment,the cold-resistance ability of them had been further demonstrated,showed in order as S. spurium‘Coccineum'>S. hispanicum>S. lineare>S. emarginatum.