Full TGIF Record # 42065
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Web URL(s):https://www.crops.org/publications/cs/pdfs/38/1/CS0380010157
    Last checked: 08/05/2010
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Publication Type:
i
Refereed
Author(s):Ebdon, J. S.; Petrovic, A. M.; Dawson, T. E.
Author Affiliation:Dep. of Plant and Soil Sciences, 12F Stockbridge Hall, Univ. of Massachusetts, Amherst, MA 01003; Dep. of Floriculture and Ornamental Horticulture, Cornell Univ., and Dep. of Ecology and Systematics, Cornell Univ., Ithaca, NY 14853
Title:Relationship between carbon isotope discrimination, water use efficiency, and evapotranspiration in Kentucky bluegrass
Source:Crop Science. Vol. 38, No. 1, January/February 1998, p. 157-162.
Publishing Information:Madison, WI: Crop Science Society of America
# of Pages:6
Keywords:TIC Keywords: Relationships; Carbon; Isotopes; Water use; Efficiency; Evapotranspiration; Poa pratensis
Abstract/Contents:"Carbon isotope discrimination (Δ) is a negatively correlated with water use efficiency (WUE) in several C₃ grass species and was proposed as a selection criterion for improving WUE. Our objectives were to determine the relationship between Δ and WUE in cultivars of Kentucky bluegrass (Poa pratensis L., KBG) maintained as turf, and to determine the relationship between cultivar Δ and evapotranspiration (ET) rate measured under non-limiting soil moisture conditions. We view Δ as potential index of ET and an alternative to weighing lysimeters in selecting C₃ turfgrass for reduced ET. WUE of 11 cultivars was evaluated in 25-cm-diam., fritted clay filled lysimeters, over two 4-d harvest periods. Clipping dry weight accumulated above a 50-mm base mowing height for each 4-d period was used as the productivity component in calculating WUE. Gravimetric water loss determined by the water balanced method was used as the transpirational component. Cultivars differed significantly (P≤0.05) in WUE, Δ, and ET, depending on the harvest period. Also, the reliability of Δ in predicting WUE and ET was dependent on the harvest period. During the first harvest period, Δ was inversely related with WUE (r=-0.55**, significant at P≤0.01) and cultivar ET varied significantly with Δ (r=0.64*, significant at P≤0.05). During the second harvest period, no significant relationship (P>0.05) developed between Δ and WUE (r=-0.21), or between Δ and cultivar ET (r=0.32). Observations for the first and second harvest periods varied considerably in canopy temperature, with temperature ranging from 20.5 to 22.0 ± 1.3°C, and 27.3 to 36.0 ± 3.4°C, respectively. Theory predicts under the assumption of equal leaf temperature, Δ and WUE are correlated. It was likely that leaf temperature differences during the second harvest contributed significantly to the breakdown of the relationship between Δ and WUE. This assumption was likely met during the first harvest period only, therefore Δ and WUE (and ET) were related. Selecting for low Δ appears to have potential for identifying cool season turfgrass for reduced ET. However, further research is needed to determine the reliability of Δ in predicting ET under non-limiting and water limiting conditions."
Language:English
References:15
Note:Figures
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ebdon, J. S., A. M. Petrovic, and T. E. Dawson. 1998. Relationship between carbon isotope discrimination, water use efficiency, and evapotranspiration in Kentucky bluegrass. Crop Sci. 38(1):p. 157-162.
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https://www.crops.org/publications/cs/pdfs/38/1/CS0380010157
    Last checked: 08/05/2010
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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