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The complex character of photosynthesis in cucumber fruit

文献类型： 外文期刊

作者： Sui, Xiaolei 1 ; Shan, Nan 1 ; Hu, Liping 2 ; Zhang, Cankui 3 ; Yu, Changqing 4 ; Ren, Huazhong 1 ; Turgeon, Robert 5 ; Z 1 ;

作者机构： 1.China Agr Univ, Coll Hort, Beijing Key Lab Growth & Dev Regulat Protected Ve, Beijing 100193, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Beijing Vegetable Res Ctr, Beijing 100097, Peoples R China

3.Purdue Univ, Dept Agron, W Lafayette, IN 47907 USA

4.Ecotech Ecol Technol Ltd, Ecol Lab, Beijing 100190, Peoples R China

5.Cornell Univ, Plant Biol Sect, Ithaca, NY 14853 USA

关键词： Chloroplast;cucumber;fruit photosynthesis;PEPC (phosphoenolpyruvate carboxylase);respiration;Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase)

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2017 年 68 卷 7 期

页码：

收录情况： SCI

摘要： The surface area of a mature green cucumber (Cucumis sativa L.) fruit is comparable with that of a functional leaf, but the characteristics of fruit photosynthesis and its contribution to growth are poorly understood. Here, the photosynthetic properties of two genotypes of cucumber (dark green and light green fruits) were studied using a combination of electron microscopy, immunogold enzyme localization, chlorophyll fluorescence imaging, isotope tracer, and fruit darkening techniques. Chlorophyll content of the exocarp is similar to that of leaves, but there are no distinctive palisade and spongy tissues. The efficiency of PSII is similar to that in leaves, but with lower non-photochemical quenching (NPQ). Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) is found mainly in the exocarp, while phosphoenolpyruvate carboxylase (PEPC) is primarily localized to vascular bundles and placenta tissue. Rubisco and PEPC expression at both transcriptional and translational levels increases concurrently during fruit growth. The contribution of fruit photosynthesis in exocarp to its own C accumulation is 9.4%, while similar to 88% of respiratory CO2 in fruit was captured and re-fixed. Photosynthesis by cucumber fruits, through direct fixation of atmospheric CO2 and recapture of respired CO2, as verified by (CO2)-C-14 uptake and gas exchange, makes an important contribution to fruit growth.

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