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Published online 27 October 2005
Published in Crop Sci 45:2517-2522 (2005)
© 2005 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Carbon Isotope Discrimination Accurately Reflects Variability in WUE Measured at a Whole Plant Level in Rice

S. M. Impa, S. Nadaradjan, P. Boominathan, G. Shashidhar, H. Bindumadhava and M. S. Sheshshayee*

Department of Crop Physiology, University of Agricultural Sciences, GKVK Campus, Bangalore 560 065, INDIA



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  		Fig. 1. Relationship between WUE and carbon isotope discrimination ({Delta}13C) among 34 genotypes of rice.

 


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  		Fig. 2. Relationship between WUE and carbon isotope discrimination ({Delta}13C) among six selected genotypes of rice (• = ALM 6; {blacksquare} = IET 15963; {blacktriangleup} = MRB-1; {square} = IET 16364; {Delta} = IET 15297; {circ} = MRB-2).

 



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  		Fig. 3. Relationship between (a) WUE and (b) {Delta}13C values for six selected genotypes of rice determined in 2 separate experiments (• = ALM 6; {blacksquare} = IET 15963; {blacktriangleup} = MRB-1; {square} = IET 16364; {Delta} = IET 15297; {circ} = MRB-2).

 


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  		Fig. 4. Relationship between WUE and mean transpiration rate (MTR) among 34 genotypes of rice.

 


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  		Fig. 5. Relationship between water use efficiency (WUE) and net assimilation rate (NAR) among 34 genotypes of rice (r = 0.14; n = 34, not significant)

 




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