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AOBPreview originally published online on January 8, 2003
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Annals of Botany 91: 373-381, 2003
© 2003 Annals of Botany Company

Response of Potato Tuber Cell Division and Growth to Shade and Elevated CO2

CHIEN-TEH CHEN1 and TIM L. SETTER*,1

1 Department of Crop and Soil Science, Cornell University, Ithaca, New York 14853, USA

* For correspondence. Fax +1 607 255 2644, e-mail TLS1{at}cornell.edu

Received: 27 June 2002; Returned for revision: 12 September 2002; Accepted: 15 November 2002    Published electronically: 8 January 2003

Plants adjust their sink-organ growth rates, development and distribution of dry matter in response to whole-plant photosynthate status. To advance understanding of these processes, potato (Solanum tuberosum L.) plants were subjected to CO2 and light flux treatments, and early tuber growth was assessed. Atmospheric CO2 (700 or 350 µmol mol–1) and light flux (shade and control illumination) treatments were imposed at two growth stages: tuber initiation (TI) and tuber bulking (TB). Elevated CO2 increased accumulation of total net biomass when imposed at both stages, and increased tuber growth rate by about 36 %, but did not increase the number of tubers. Elevated CO2 increased the number of cells in tubers at both TI and TB stages, whereas shade substantially decreased the number of cells at both stages. Generally, treatments did not affect cell volume or the proportion of nuclei endoreduplicating (repeated nuclear DNA replication in the absence of cell division), but the shade treatment led to a decrease in cell volume at TB and a decrease in endoreduplication at TI. Elevated CO2 increased, and shade decreased, glucose concentration and soluble invertase activity in the cambial zones at both TI and TB, whereas sucrose concentration and activities of glucokinase, fructokinase, cell-wall-bound invertase and thymidine kinase were unaffected. Modulation of tuber cell division was responsible for much of the growth response to whole-plant photosynthate status, and treatments affected cambial-zone glucose and soluble invertase in a pattern suggesting involvement of a glucose signalling pathway.

Key words: Solanum tuberosum L., potato tuber, elevated atmospheric CO2, cell division, cell proliferation, sugar regulation, sink capacity, partitioning.


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