缺镁对龙眼光合作用的影响

园艺学报 ›› 2001, Vol. 28 ›› Issue (2): 101-106.

缺镁对龙眼光合作用的影响

李􀀁延¹；刘星辉²；庄卫民¹

(¹ 福建农业大学土地与环境学系, 福州350002; ² 福建农业大学园艺系, 福州350002)

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2001-04-25 发布日期:2001-04-25

The Effect of Magnesium Deficiency on Photosynthesis of Longan (Dimocarpus longana Lour. ) Seedlings

Li Yan, Liu Xinghui, and Zhuang Weimin

(¹Department of Land and Environmental Science, Fujian Agricultural University , Fuz hou 350002; ²Department of Horticulture , Fujian Agricultural University , Fuzhou 350002)

Received:1900-01-01 Revised:1900-01-01 Online:2001-04-25 Published:2001-04-25

摘要/Abstract

摘要： 缺镁胁迫下, 龙眼(Dimocarpus longana Lour. ) 幼苗叶片光合色素含量、叶绿体
对光吸收能力、表观量子产量和羧化效率下降; 光补偿点和CO₂ 补偿点提高, 光饱和点和CO₂饱和点下降; Chl. a 荧光动力学参数Fv/ Fo、Fv/ Fm 和Fd/ Fs 的降低说明缺镁龙眼PS活性下降; F₆₈₅/ F₇₃₆比值的下降则表明缺镁降低了激发能在两个光系统之间分配的调节能力。就缺镁对龙眼光合作用影响的机理进行了讨论。

关键词: 龙眼, 镁, 光合作用

Abstract: The effect of magnesium deficiency on photosynthesis of longan (Dimocarpus longana Lour.) seedlings was studied using hydroponic experiment. Magnesium def iciency led to the decline of the contents of chlorophyll and carotenoid, the capability of light energy absorption of chloroplast as well as maximum photosynthesis at both light and CO₂ saturation conditions. On the other hand, the apparent quantum yield, carboxylation efficiency and both light and CO₂ compensat ion points turned out to become higher as magnesium become deficient . The results of chlorophyll a fluorescence induction measurement showed a decrease of Fv/ Fo, Fv/Fm and Fd/ Fs in magnesium deficient longan leaves, indicating that primary light energy conversion ability and potential photosynthet ic activities of PSI were inhibited. The decrease in F₆₈₄/ F₇₃₆ under magnesium deficiency condit ion suggested that the regulat ion of excitation energy distribution between PS 􀀂 and PSII was reduced. The discussion was made on the responsive mechanism of longan to magnesium deficiency.

Key words: Longan, Magnesium, Photosynthesis

中图分类号:

李延;刘星辉;庄卫民. 缺镁对龙眼光合作用的影响[J]. 园艺学报, 2001, 28(2): 101-106.

Li Yan;Liu Xinghui;and Zhuang Weimin. The Effect of Magnesium Deficiency on Photosynthesis of Longan (Dimocarpus longana Lour. ) Seedlings[J]. ACTA HORTICULTURAE SINICA, 2001, 28(2): 101-106.

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