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    金花茶幼苗光合生理生态特性研究

    Photosynthetic ecophysiological characteristics of Camellia nitidissima seedlings

    • 摘要: 采用Li-6400便携式光合作用系统对金花茶盆栽幼苗光合生理特性进行研究。结果表明:1)在不遮阴的条件下,幼苗夏季光合作用有午休现象,最高峰出现在08:00,其净光合速率为3.38 μmol/(m 2·s);2)光饱和点和光补偿点都较低,分别为476.46和6.13 μmol/(m 2·s),是一种典型的阴生植物;3)在温度为30℃,光照强度为1 000 μmol/(m 2·s),湿度为50%~60%的条件下,光合能力为12.58~13.50 μmol/(m 2·s),CO 2浓度在25~1 000 μmol/mol的范围内,其净光合速率随浓度升高而显著上升,CO 2饱和点约为1 50000 μmol/mol,CO 2补偿点为99.48 μmol/mol,最大羧化效率为0.011 8;4)幼苗喜热,在35℃下净光合速率最高,对低温有一定的适应能力,但不适应40℃的高温条件。5)幼苗不耐干旱,即使轻度水分亏缺也会抑制其光合作用。

       

      Abstract: The photosynthetic physiological characteristics of potcultured Camellia nitidissima seedlings were studied with a Li-6400 (LI-COR. Lincoln, Nebraska, USA) portable photosynthesis system. The results show that under open conditions without shade, the diurnal changes in the photosynthetic rate (Pn) showed a curve with two peaks and a clear phenomenon of midday depression in photosynthesis. The maximum photosynthetic rate (3.38 μmol/(m 2·s) appeared at 8:00 AM during the summer. The light saturation (LSP) and light compensation points (LCP) were 476.46 μmol/(m2·s) and 6.13 μmol/(m2·s), respectively. They were very low, indicating that these seedlings required shade condition. Under control condition (temperature 30℃, light 1 000 μmol/(m2·s) and humidity 50%-60%), the photosynthetic capacity was 12.58-13.50 μmol/(m 2·s) and the photosynthetic rate increased linearly when the concentration of CO 2 increased from 25 μmol/mol to 1 000 μmol/mol. The CO2 saturation point (CSP) was 1 50000 μmol/mol, the compensation point (Г) 99.48 μmol/mol and the maximum carboxylation rate (CE) 0.011 8 The seedlings tended to require heat, their photosynthetic rate reached its highest value at 35℃ and had a certain capacity to adapt to lowtemperatures, but could not tolerate 40℃. The seedlings were sensitive to drought stress and even a slight water deficit could depress their photosynthesis. 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