基质温度对三角梅插穗生根及其叶片光合作用的影响

摘要

The effects of media temperature(18 ℃ ,20 ℃ ,25 ℃ ,30 ℃ and 33 ℃) on rooting and leaf photosynthesis of Bougainvillea glabra cuttings were measured under the condition of intelligent monitor and control. The results showed that with the increasing of media temperature,an increasing of the net photosynthesis rate,transpiration rate,stomatal conductance and intercellular CO2 concentration in B. glabra cuttings leaves, while the stomatal limitation decreased. The net photosynthesis rate was lower and there was no obvious differences of treatment 18 ℃ and 20 ℃.The differences of net photosynthesis rate among treatment 25 ℃ ,30 ℃ and 33 ℃ were obvious. The rooting number per cutting was less,and the root length was shorter,while the survival rate of the cutting was lower when the media temperature was lower than 20 ℃. When the media temperature was higher than 30 ℃, the fallen number and the basal sterns rotting rate of cutting increased,while the survival rate decreased. In summary,25-30 ℃ is the optimal media temperature for rooting of Bougainvillea glabra cuttings.%探讨了智能调控下18、20、25、30、33℃的5个基质温度处理对三角梅叶片光合作用及插穗生根的影响.结果表明:随着基质温度上升,三角梅插穗叶片净光合速率增加,18、20℃处理的净光合速率较低,两处理间未见显著性差异,但均显著地低于处理间未见明显差异的25、30、33℃处理.随着基质温度上升,叶片蒸腾速率、气孔导度及胞间CO2浓度增加,气孔限制值下降.低于20℃基质温度处理插穗生根数较少、根长度较短,同时成活率较低.高于30℃基质温度处理插穗落叶数及茎基腐烂率明显提高,成活率显著下降.三角梅插穗生根的基质温度以25～30℃为适宜.