玫瑰葉齡及品種對於光合作用之影響

Effects of Leaf Age and Cultivars on Photosynthesis of Rose (Rosa hybrida Hort.)

陳淑真(Shu-Cheng Chen) ； 熊同銓(Tung-Chuan Hsiung)

《華岡農科學報》 11期 (2003/06) Pp. 73-83

https://doi.org/10.29985/HKJA.200306.0006

摘要

玫瑰葉片展開後淨光合速率、蒸散速率、氣孔導度及葉肉內CO2濃度快速上升，第10天顯示最大值後隨著葉齡之土增加而下降，葉齡30天時，光合成速率只有高峰期之36%左右；葉綠素含量及a/b比值則未有隨葉齡而減少之傾向。品種間以'Escimo'光合成速率最高，其次為'Nobless'、'Pavarotti'、'Gland gala'之順序，品種間淨光合速率差距可達30%，光合成速率較高之品種，也顯示較高之蒸散速率、氣孔導度及葉肉內CO2濃度；不過品種間葉面積、葉綠素含量及氣孔密度之差異，則與光合成速率之高低沒有直接的關係。在同一品種上，開花枝淨光合成速率較低，但氣孔導度及葉肉內CO2含量則有高於發育枝之傾向；開花枝之葉面積較大但葉綠素含量及氣孔密度較低。

關鍵字

玫瑰 ； 葉齡 ； 淨光合速率

並列摘要

The net photosynthesis rate, transpiration rate, stomatal conductance and CO2 concentration in mesophyll of rose will reach maximum value at 10 days after leaves expansion. Then they will decrease by the age. At 30 days the photosynthesis rate will show only 36% compared to the high peak. The 'Escimo' indicated the highest photosynthesis rate, then the order will be 'Nobless', 'Pavarotti' and the lowest, 'Gland Gala'. In high photosynthesis rate cultivars they also indicated high transpiration rate, stomatal conductance and CO2 concentration in mesophyll. The difference of photosynthesis rate between the cultivars is near to 30%, but it is not concerned to the leaf area, chlorophyll content or the stomatal density of cultivars. In the same cultivar, the flowering shoot has higher photosynthesis rate than the vegetative shoot, but lower stomatal conductance and CO2 concentration in mesophyll. Also the flowering shoot has more extensive leaf area but lower chlorophyll content and stomatal density.

並列關鍵字

Rosa hybrida Hort. ； leaf age ； net photosynthesis rate