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Media type:
E-Article
Title:
Physiological Responses in Potato Plants under Continuous Irradiation
Contributor:
Cao, Weixing;
Tibbitts, Theodore W.
imprint:
American Society for Horticultural Science, 1991
Published in:Journal of the American Society for Horticultural Science
Language:
Not determined
DOI:
10.21273/jashs.116.3.525
ISSN:
0003-1062;
2327-9788
Origination:
Footnote:
Description:
<jats:p>The physiological responses of four potato <jats:italic>(Solanum tuberosum</jats:italic> L.) cultivars to continuous irradiation were `determined in a controlled environment. Under a constant 18C and a constant photoperiod of 470 μmol·s<jats:sup>-1</jats:sup>·m<jats:sup>-2</jats:sup> of photosynthetic photon flux, `Denali' and `Haig' grew well and produced large plant and tuber dry weights when harvested 56 days after transplanting. `Kennebec' and `Superior' were severely stunted, producing only 10% of the plant dry matter produced by `Denali' and `Haig'. The differences in leaf chlorophyll concentration and stomatal conductance were not consistent between these two groups of cultivars. The leaf net CO<jats:sub>2</jats:sub> assimilation rates in `Kennebec' and `Superior' were lower, and intercellular CO<jats:sub>2</jats:sub> partial pressures were higher than in `Denali' and `Haig'. These results indicate that inhibition of net CO<jats:sub>2</jats:sub> assimilation in `Kennebec' and `Superior' was not due to a limiting amount of chlorophyll or to CO<jats:sub>2</jats:sub> in the leaf tissues. Concentrations of starch in leaflets of `Kennebec' and `Superior' plants were only 10% of those in `Denali' and `Haig' plants, although soluble sugar concentrations were similar in the four cultivars. Therefore, the lower net CO<jats:sub>2</jats:sub> assimilation rates in stunted `Kennebec' and `Superior' plants were not associated with an excess carbohydrate accumulation in the leaves.</jats:p>