Book Title: | NA |
Year Published: | 2008 |
Month Published: | NA |
Author: | Fleisher, David H. ; Reddy, V.R. ; Timlin, Dennis J. |
Book Group Author: | NA |
Abstract: | Despite the agronomic importance of potato (Solanum tuberosum L.), the interaction of atmospheric carbon dioxide concentration ([CO₂]) and drought has not been well studied. Two soil-plant-atmosphere research (SPAR) chamber experiments were conducted concurrently at ambient (370Îơmolmol⁻℗£) and elevated (740Îơmolmol⁻℗£) [CO₂]. Daily irrigation for each chamber was applied according to a fixed percentage of the water uptake measured for a control chamber for each [CO₂] treatment. We monitored diurnal and seasonal canopy photosynthetic (A G) and transpiration rates and organ dry weights at harvest. Plants grown under elevated [CO₂] had consistently larger photosynthetic rates through most of the growth season, with the maximum A G at 1600Îơmolphotonsm⁻℗ø s⁻℗£ 14% higher at the well-watered treatments. Water stress influenced ambient [CO₂] plants to a larger extent, and reduced maximum canopy A G, growth season duration, and seasonal net carbon assimilation up to 50% of the control in both [CO₂] treatments. Water use efficiency increased with water stress, particularly at elevated [CO₂], ranging from 4.9 to 9.3gdrymassL⁻℗£. Larger photosynthetic rates for elevated [CO₂] resulted in higher seasonal dry mass and radiation use efficiency (RUE) as compared with ambient [CO₂] at the same irrigation level. This extra assimilate was partitioned to underground organs, resulting in higher harvest indices. Our findings indicate that increases in potato growth and productivity with elevated [CO₂] are consistent over most levels of water stress. This work can support various climate change scenarios that evaluate different management practices with potato. |
Pages: | 1109 - 1122 |
URL: | http://0-search.ebscohost.com.catalog.library.colostate.edu/login.aspx?direct=true&AuthType=cookie,ip,url,cpid&custid=s4640792&db=agr&AN=IND44061642&site=ehost-live |
Volume: | 148 |
Number: | 6-7 |
Journal: | Agricultural and forest meteorology |
Journal ISO: | NA |
Organization: | NA |
Publisher: | NA |
ISBN: | NA |
ISSN: | 01681923 |
DOI: | NA |
Keywords: | climate change, drought, plant-water relations, wateruptake, irrigation rates, net assimilation rate, radiation useefficiency, harvest index, dry matter partitioning, photosynthates,duration, crop yield, transpiration, photosynthesis, elevatedatmospheric gases, plant response, soil-plant-atmosphere interactions,carbon dioxide, Solanum tuberosum, potatoes, canopy, growing season,water use efficiency, dry matter accumulation, seasonal variation, waterstress, gas exchange, diurnal variation |
Source: | EBSCO |
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