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The existence of C-4-bundle-sheath-like photosynthesis in the mid-vein of C-3 rice

文献类型： 外文期刊

作者： Shen, Weijun 1 ; Ye, Luhuan 1 ; Ma, Jing 1 ; Yuan, Zhongyuan 1 ; Zheng, Baogang 1 ; Lv, Chuangen 2 ; Zhu, Ziqiang 1 ; Che 1 ;

作者机构： 1.Nanjing Normal Univ, Coll Life Sci, 1 Wenyuan Rd, Nanjing 210023, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Food & Crops, 50 Zhongling St, Nanjing 210014, Jiangsu, Peoples R China

3.Univ Illinois, Urbana, IL 61801 USA

关键词： C-3 and C-4 photosynthesis;Cyclic/linear electron flow;Dysfunctional PSII;Mid-vein;Rice

期刊名称：RICE （ 影响因子：4.783； 五年影响因子：5.23 ）

ISSN： 1939-8425

年卷期： 2016 年 9 卷

页码：

收录情况： SCI

摘要： Background: Recent studies have shown that C-4-like photosynthetic pathways partly reside in photosynthetic cells surrounding the vascular system of C-3 dicots. However, it is still unclear whether this is the case in C-3 monocots, especially at the molecular level. Results: In order to fill this gap, we investigated several characteristics required for C-4 photosynthesis, including C-4 pathway enzymes, cyclic/non-cyclic photophosphorylation rates, the levels and assembly state of photosynthetic machineries, in the mid-veins of C-3 monocots rice with leaf laminae used as controls. The signature of photosystem photochemistry was also recorded via non-invasive chlorophyll a fluorescence and reflectance changes at 820 nm in vivo. Our results showed that rice mid-veins were photosynthetically active with higher levels of three C-4 decarboxylases. Meanwhile, the linear electron transport chain was blocked in mid-veins due to the selective loss of dysfunctional photosystem II subunits. However, photosystem I was sufficient to support cyclic electron flow in mid-veins, reminiscent of the bundle sheath in C-4 plants. Conclusions: The photosynthetic attributes required for C-4 photosynthesis were identified for the first time in the monocotyledon model crop rice, suggesting that this is likely a general innate characteristic of C-3 plants which might be preconditioned for the C-4 pathway evolution. Understanding these attributes would provide a base for improved strategies for engineering C-4 photosynthetic pathways into rice.

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