https://www.ahs.ac.cn/images/0513-353X/images/top-banner1.jpg|#|苹果
https://www.ahs.ac.cn/images/0513-353X/images/top-banner2.jpg|#|甘蓝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner3.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner4.jpg|#|灵芝
https://www.ahs.ac.cn/images/0513-353X/images/top-banner5.jpg|#|桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner6.jpg|#|黄瓜
https://www.ahs.ac.cn/images/0513-353X/images/top-banner7.jpg|#|蝴蝶兰
https://www.ahs.ac.cn/images/0513-353X/images/top-banner8.jpg|#|樱桃
https://www.ahs.ac.cn/images/0513-353X/images/top-banner9.jpg|#|观赏荷花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner10.jpg|#|菊花
https://www.ahs.ac.cn/images/0513-353X/images/top-banner11.jpg|#|月季
https://www.ahs.ac.cn/images/0513-353X/images/top-banner12.jpg|#|菊花

园艺学报 ›› 2006, Vol. 33 ›› Issue (2): 311-316.

• 研究论文 • 上一篇    下一篇

缺镁对菜薹光合作用特性的影响

刘厚诚;陈细明;陈日远*;宋世威;孙光闻

  

  1. (华南农业大学园艺学院, 广州510642)
  • 收稿日期:2005-04-19 修回日期:2005-06-17 出版日期:2006-04-25 发布日期:2006-04-25

Effects of Magnesium Def ic iency on Photosynthesis Characteristic of Flowering Chinese Cabbage

Liu Houcheng; Chen Ximing; Chen Riyuan*;Song Shiwei;Sun Guangwen

  

  1. (College of Horticulture, South China Agricultural University, Guangzhou 510642, China)
  • Received:2005-04-19 Revised:2005-06-17 Online:2006-04-25 Published:2006-04-25

摘要: 研究了缺镁对菜薹光合作用特性的影响, 结果表明, 菜薹叶片净光合速率( Pn) 、气孔导度和蒸腾速率的日变化均呈单峰曲线变化, 且均随缺镁程度的加大而降低, 缺镁还使Pn的高峰提早出现; 缺镁降低了叶片的光补偿点、光饱和点和饱和光强下的Pn max; 缺镁使叶片的CO2 补偿点提高, CO2 饱和点下降(Mg 1 mmol·L - 1 ) 或提高(Mg 0) , 饱和CO2 下的Pn max下降。菜薹叶片细胞间隙CO2 浓度的日变化、对光强和外界CO2 浓度的响应受缺镁处理的影响很小, 表明缺镁菜薹光合作用主要是受非气孔限制。

关键词: 菜薹, 缺镁, 光合作用

Abstract: The effects ofmagnesium deficiency on photosynthesis characteristic of flowering Chinese cabbage (Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee) were studied. Net photosynthesis rate (Pn) , stomatal conductance and transpiration rate changed in one-peak curve in daytime, and those decreased with the decrease of magnesium supply. The Pn peak reached earlier in Mg-deficiency leaves. Light compensation point, light saturation point and Pn maximum at saturated light decreased in Mg-deficiency leaves. CO2 compensation point increased, CO2 saturation point decreased (Mg 1 mmol·L - 1 ) or increased (Mg 0) , Pn maximum at saturated CO2 concentration decreased inMg-deficiency leaves. There were little effects in the changes of intracellular CO2 concentration (Ci) in daytime, the response of Ci to light and CO2 concentration byMg-deficiency, those indicated that photosynthesis inhibition in flowering Chinese cabbage by Mg-deficiency was mainly due to non-stomatal factors.

Key words: Flowering Chinese cabbage, Mg-deficiency, Photosynthesis