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Evidence of the predominance of passive symplastic phloem loading and sugar transport with leaf ageing in Camellia oleifera

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Horticultural Plant Journal 2023年第4期9卷 811-825页

作者： Shiwen Yang Kehao Liang Yongjiang Sun Jinshun Zhang Yibo Cao Jing Zhou Aibin Wang Lingyun Zhang Key Laboratory of Forest Silviculture and Conservation of the Ministry of Education The College of ForestryBeijing Forestry UniversityBeijing 100083China

phloem loading and transport of sugar from leaves to sink tissues such as fruits are crucial for yield *** oleifera is an evergreen horticultural crop with high value;however,its low production limits the development of the *** *** this study,using a combination of ultrastructural observation,fluorescence loss in photobleaching(FLIP)and inhibitor treatment,we revealed that *** leaves mainly adopt a symplastic loading route from mesophyll cells to the surrounding vascular bundle cells in minor *** assays showed that sucrose is the main sugar transported and only a small amount of raffinose or stachyose was detected in petioles,supporting a passive symplastic loading route in *** *** to leaves grown this year(LT),the carbohydrate synthesis capacity in leaves grown last year(LL)was decreased while LL retained more soluble sugar,suggesting a decrease in transport capacity with leaf *** and tissue staining showed that a reduction in plasmodesmata density leads to a decline in the degree of cellular coupling and is responsible for the weakening transport capacity in older ***-seq revealed several differentially expressed genes(DEGs)including CoPDCB1-1,CoSUT1 and CoSWEET12,which are likely involved in the regulation of phloem loading and sugar *** expression correlation network is constructed between PD-callose binding protein genes,sugar transporter genes and senescence-associated ***,this study provides the evidence of the passive symplastic phloem loading pathway in *** leaves and constructs the correlation between sugar transport and leaf ageing.

关键词： Camellia oleifera phloem loading Leaf Sugar transport Yield formation

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Rice Transcription Factor OsDOFll Modulates Sugar Transport by Promoting Expression of Sucrose Transporter and SWEET Genes

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Molecular Plant 2018年第6期11卷 833-845页

作者： Yunfei Wu Sang-Kyu Lee Youngchul Yoo Jinhuan Wei Suk-Yoon Kwon Sang-Won Lee Jong-Seong Jeon Gynheung An Crop Biotech Institute and Graduate School of Biotechnology Kyung Hee University Yongin 17104 Korea Plant Systems Engineering Research Center Korea Research Institute of Bioscience and Biotechnology Daejeon 34141 Korea

Sucrose is produced in mesophyll cells and transferred into phloem cells before it is delivered long- distance to sink tissues. However, little is known about how sucrose transport is regulated in plants. Here, we identified a T-DNA insertional mutant of Oryza sativa DNA BINDING WITH ONE FINGER 11 （OsDOF11）, which is expressed in the vascular cells of photosynthetic organs and in various sink tissues. The osdofll mutant plants are semi-dwarf and have fewer tillers and smaller panicles as compared with wild-type （WT） plants. Although sucrose enhanced root elongation in young WT seedlings, this enhance- ment did not occur in osdof11 seedlings due to reduced sucrose uptake. Sugar transport rate analyses revealed that less sugar was transported in osdofll plants than in the WT. Expression of four Sucrose Transporter （SUT） genes-OsSUT1, OsSUT3, OsSUT4, and OsSUT5-as well as two Sugars Will Eventually be Exported Transporters （SWEET） genes, OsSWEETll and OsSWEET14, was altered in various organs of the mutant, including the leaves. Chromatin immunoprecipitation assays showed that OsDOFll directly binds the promoter regions of SUT1, OsSWEETll, and OsSWEET14, indicating that the expression of these transporters responsible for sucrose transport via apopiastic loading is coordinately controlled by OsDOFll. We also observed that osdofll mutant plants were less susceptible to infection byXanthomonas oryzae pathovar oryzae, suggesting that OsDOFll participates in sugar distribution during pathogenic in- vasion. Collectively, these results suggest that OsDOFll modulates sugar transport by regulating the expression of both SUT and SWEET genes in rice.

关键词： OsDOF11 phloem loading rice SUT SWEET Xanthomonas oryzae

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