温度对铁皮石斛生长及生理特性的影响

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。

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

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.