Journal
SCIENTIA HORTICULTURAE
Volume 119, Issue 2, Pages 113-116Publisher
ELSEVIER
DOI: 10.1016/j.scienta.2008.07.019
Keywords
Chlorocholine chloride; Solarium tuberosum L.; Photoassimilates partitioning; (CO2)-C-14 labelling
Categories
Funding
- State 863 High Technology Project of China [2006AA10A213]
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Treatment of potato (Solanum tuberosum L.) with chlorocholine chloride (CCC) applied twice as a foliar spray 25 and 30 days after planting has shown to decrease shoot and stolon growth but increase tuber yield. However, the regulatory role of CCC on translocation of recently fixed photoassimilates into different parts of potato plants has not been fully illustrated. In this study, C-14-isotope labelling technique was used to estimate the photosynthetic capacity and photoassimilate partitioning among leaves, stems, roots + stolons, and tubers of potted potatoes treated with 1.5 g l(-1) CCC. CCC treatment significantly increased tuber dry mass but reduced leaf dry mass. CCC-treated leaves had significantly higher chlorophyll and carotenoid contents and assimilated 22.0% more (CO2)-C-14 per leaf dry mass than the controls. Compared with the control, CCC treatment reduced the translocation of C-14-photoassimilates into leaves, steins and roots + stolons but increased that into tubers. CCC-treated leaves exported 14.6% more C-14-photoassimilates into other parts of the plants. In addition, CCC treatment reduced C-14-Soluble sugarand C-14-starch accumulation in leaves and stems but enhanced them in tubers and roots + stolons. Collectively, the results indicate that CCC treatment significantly improves the photosynthetic capacity of potato leaves and promotes photoassimilates partitioning into tubers thereby enhancing tuber growth. (C) 2008 Elsevier B.V. All rights reserved.
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