温度对铁皮石斛生长及生理特性的影响

Effects of Temperature on the Growth and Physiological Characteristics of Dendrobium officinale(Orchidaceae)

通过不同温度下的控制实验,研究了铁皮石斛光合作用与生长对温度的响应,以期为铁皮石斛的栽培提供理论依据。温度对铁皮石斛的光合速率(Pn)有明显影响,30℃处理的植株具有最高的饱和光合速率(Pmax),其较高的光合速率与RuBP电子传递速率与羧化速率间相对平衡有关。温度对铁皮石斛茎的生长及多糖含量有明显影响,20℃处理的石斛多糖含量显著性的高于其他两个处理,而茎长、茎节数、茎鲜重等则是在30℃下最高。结果表明,30℃的温度对铁皮石斛的光合作用较为适宜,但在20℃条件下植株具有更高的多糖含量。

In this paper,we studied the response of photosynthesis and growth in Dendrobium officinale to temperature under the control experiment to provide a theoretical basis for its cultivation.Temperature had a significant effect on the photosynthetic rate（Pn）of D.officinale.The light saturated photosynthesis at ambient CO2 concentration（Pmax）of the plants were highest at 30℃.High photosynthetic rate at 30℃ were related to the more balance between the maximum rate of electron transport and maximum rate of RuBP-mediated carboxylation.Moreover temperature also showed a significant effect on the growth and polysaccharide content of D.officinale＇s stem.The polysaccharide content of D.officinale at 20℃ was significantly higher than that at other temperatures,while the stem length,stem node number,stem fresh weight and stem dry weight were achieved the highest point at 30℃.The results showed that,the temperature of 30℃ was more appropriate for the photosynthesis of D.officinale,while the plants at 20℃ have higher polysaccharide content.