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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chen, Cheng Yuan, Yulin Zhang, Chen Li, Huixia Ma, Fengwang Li, Mingjun |
| Description | Country affiliation: China Author Affiliation: Chen C ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China.); Yuan Y ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China.); Zhang C ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China.); Li H ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China.); Ma F ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China.); Li M ( State Key Laboratory of Crop Stress Biology in Arid Areas/College of Horticulture, Northwest A&F University, Yangling 712100, Shaanxi, China. Electronic address: limingjun@nwsuaf.edu.cn.) |
| Abstract | Phloem unloading plays a pivotal role in photoassimilate partitioning and the accumulation of sugars in sink organs, e.g. fruit. Here, we investigated the pathway of sucrose unloading in kiwifruit (Actinidia deliciasa cv. Qinmei) using a combination of electron microscopy, transport of the phloem-mobile symplastic tracer carboxyfluorescein and enzyme activity and gene expression assays. Our structural investigation revealed that the sieve element-companion cell complex of bundles feeding the fruit flesh was symplastically isolated from its surrounding parenchyma cells throughout fruit development, whereas numerous plasmodesmata were present between the phloem parenchyma cells. Consistent with this, carboxyfluorescein unloading showed that the dye remained confined in the phloem strands during fruit development. The activities and expression of cell wall acid invertase in fruit flesh were lower than those of other enzymes that catalyze sucrose dissociation. However, sucrose synthase showed higher enzyme activities and mRNA expression in fruit flesh compared with other detected enzymes. These results imply that, in kiwifruit flesh, phloem unloading of sucrose is predominantly an apoplastic pathway during fruit development, and that sucrose synthase is a key enzyme for sucrose post-unloading pathways. |
| File Format | HTM / HTML |
| ISSN | 01689452 |
| Journal | Plant Science |
| Volume Number | 255 |
| e-ISSN | 18732259 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2017-02-01 |
| Publisher Place | Ireland |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany |
| Content Type | Text |
| Resource Type | Article |
| Subject | Genetics Plant Science Medicine Agronomy and Crop Science |
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