<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions"^^ . "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.\r\n\r\n"^^ . "1994" . . "34" . "1" . . "Crop Science Society of America"^^ . . . "Crop Science"^^ . . . "0011183X" . . . . . . . . . . . . . "G C"^^ . "Wright"^^ . "G C Wright"^^ . . "R C"^^ . "Nageswara Rao"^^ . "R C Nageswara Rao"^^ . . "G D"^^ . "Farquhar"^^ . "G D Farquhar"^^ . . . . . . "Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions (PDF)"^^ . . . . . . . . . . . "Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions (Image (JPEG))"^^ . . . . . . "Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions (Indexer Terms)"^^ . . . . . "HTML Summary of #3129 \n\nWater-use efficiency and carbon isotope discrimination in peanut under water deficit conditions\n\n" . "text/html" . . . "Groundnut"@en . .