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Growth Responses of Nutrient-Stressed <em>Cenchrus ciliaris</em> Under Carbon Dioxide Enrichment | OMICS International | Abstract
ISSN: 2157-7617

Journal of Earth Science & Climatic Change
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Research Article

Growth Responses of Nutrient-Stressed Cenchrus ciliaris Under Carbon Dioxide Enrichment

Taou Saleh Ksiksi* and Noor Othman El-Shaigy
Biology Department, UAE University, Al-Ain, United Arab Emirates
Corresponding Author : Taoufik Saleh Ksiksi
Biology Department, Faculty of Science
UAE University, Al-Ain 175551
United Arab Emirates
Tel: +971507132808
Fax: +97137677535
Received August 31, 2012; Accepted October 19, 2012; Published October 21, 2012
Citation: Ksiksi TS, El-Shaigy NO (2012) Growth Responses of Nutrient-Stressed Cenchrus ciliaris Under Carbon Dioxide Enrichment. J Earth Sci Climate Change 3:127. doi:10.4172/2157-7617.1000127
Copyright: © 2012 Ksiksi TS, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


The response of plants to carbon dioxide (CO2) enrichment is an important aspect to be thoroughly investigated in order to accurately predict the impact on resource use as well ecosystem level responses. But the extent of response of individual plant species is dependent on the underlying biotic and abiotic stresses. In the current project, the response of Cenchrus ciliaris, a C4 grass, was investigated under CO2 enrichment conditions under nutrient stress. Eco-physiological growth parameters were assessed within two plastic chambers with one chamber kept at ambient CO2 conditions (500ppm) and the second enriched with CO2 (1000ppm). Three treatments were studied: ambient (ACO2), enriched (ECO2) and alternating (alternating two weeks in each chamber; ALCO2). High atmospheric CO2 concentrations did increase shoot and inflorescence production under nutrient stress. The blade area of ECO2 plants was significantly larger than that of ALCO2 plants on the 31st of March 2010 at P=0.06 and on the 7th of April 2010 (P=0.074). Stomatal density of C.ciliaris, however, did decrease for ECO2 and ALCO2. Under ACO2, average sheath biomass was signcantly higher under nutrient stressed condition than under non-stressed condition (65.81% vs. 52.96%; respectively). Growth allocations results revealed a rush toward reproductive production for ECO2 under nutrient stress conditions.


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