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Interacting effects of photoperiod and photosynthetic photon flux on net carbon assimilation and starch accumulation in potato leavesThe effect of photoperiod (PP) on net carbon assimilation rate (Anet) and starch accumulation in newly mature canopy leaves of 'Norland' potato (Solanum tuberosum L.) was determined under high (412 varies as mol m-2s-1) and low (263 varies as mol m-2s-1) photosynthetic photon flux (PPF) conditions. The Anet decreased from 13.9 to 11.6 and 9.3 micromoles m-2s-1, and leaf starch increased from 70 to 129 and 118 mg g-1 drymass (DM) as photoperiod (PP) was increased from 12/12 to 18/6, and 24/0, respectively. Longer PP had a greater effect with high PPF conditions than with low PPF treatments, with high PPF showing greater decline in Anet. Photoperiod did not affect either the CO2 compensation point (50 micromoles mol-1) or CO2 saturation point (1100-1200 micromoles mol-1) for Anet. These results show an apparent limit to the amount of starch that can be stored (approximately 15% DM) in potato leaves. An apparent feedback mechanism exists for regulating Anet under high PPF, high CO2, and long PP, but there was no correlation between Anet and starch concentration in individual leaves. This suggests that maximum Anet cannot be sustained with elevated CO2 conditions under long PP (> or = 12 hours) and high PPF conditions. If a physiological limit exists for the fixation and transport of carbon,then increasing photoperiod and light intensity under high CO2 conditions is not the most appropriate means to maximize the yield of potatoes.
Document ID
20040089749
Acquisition Source
Kennedy Space Center
Document Type
Reprint (Version printed in journal)
Authors
Stutte, G. W.
(NASA Kennedy Space Center Cocoa Beach FL United States)
Yorio, N. C.
Wheeler, R. M.
Date Acquired
August 21, 2013
Publication Date
March 1, 1996
Publication Information
Publication: Journal of the American Society for Horticultural Science. American Society for Horticultural Science
Volume: 121
Issue: 2
ISSN: 0003-1062
Subject Category
Man/System Technology And Life Support
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Number 61-20
NASA Center KSC
NASA Program Advanced Life Support
NASA Discipline Life Support Systems

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