"3129","9","archive","65",,,"disk0/00/00/31/29","2011-10-23 08:05:51","2011-10-23 08:05:51","2011-10-23 08:05:51","article",,,"show","Library-ICRISAT@cgiar.org",,,"","","","","","","","","","","0",,,"Wright","G C","","","","","","","Nageswara Rao","R C","","","","",,,,,"","",,,,,"","","Res. School of Biological Sci.(Canberra)","Australia","Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions","pub","s1.3","","","restricted",,,,,,"Because of its relationship with water-use efficiency (W), carbon isotope discrimination in leaves (Δ) was proposed to be useful for identifying genotypes with greater water-use efficiency. In this study we examined the relationship between W and Δ in four peanut (Arachis hypogaea L.) genotypes. The genotypes were grown in and around mini-lysimeters embedded in soil and were subjected to two drought regimes, intermittent and prolonged water deficit conditions, by varying the irrigation timing and amount. Automated rain-out shelters prevented any rain from reaching the experimental plots during the treatment period. The mini-lysimeters allowed accurate measurement of water use and total dry matter (including roots) in a canopy environment. Water-use efficiency, which ranged from 1.81 to 3.15 g kg−1, was negatively correlated with Δ, which ranged from 19.1 to 21.8%. Tifton-8 had the highest W (3.15 g kg−1) and Chico the lowest (1.81 g kg−1, representing a variation in W of 74% among genotypes. Variation in W arose mainly from genotypic differences in total dry matter production rather than from differences in water use. It is concluded that δ is a useful trait for selecting genotypes of peanut with improved W under drought conditions in the field. A strong negative relationship existed between W and specific leaf area (SLA, cm3 g−1) and between Δ and SLA, indicating that genotypes with thicker leaves had greater W. SLA could therefore be used as a rapid and inexpensive selection index for high W in peanut where mass spectrometry facilities are not available.

","1994","published",,"Crop Science","34","1","Crop Science Society of America",,"92-97",,,,,,,,,,,"TRUE",,"0011-183X",,,,,,"","http://dx.doi.org/10.2135/cropsci1994.0011183X003400010016x","http://scholar.google.co.in/scholar?hl=en&q=allintitle%3A+Water-Use+Efficiency+and+Carbon+Isotope+Discrimination+in+Peanut+under+Water+Deficit+Conditions&btnG=Search&as_sdt=0%2C5&as_ylo=&as_vis=0","author",,"International Crops Research Institute for the Semi-Arid Tropics","",,,,,,"",,,,,,,"",,,,,"",,,,,"","",,,,,"","",,,,,
"3129",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"Nageswara Rao","R C","","",,,,,,,,,,,,,,,,,,,,,,,"ICRISAT(Patancheru)","India",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"Australian Centre for International Agricultural Research",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
"3129",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,"Farquhar","G D","","",,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,