
TY  - JOUR
A1  - Hubick, KT 
A1  - Farquhar, GD 
A1  - Shorter, R 
T1  - Correlation Between Water-Use Efficiency and Carbon Isotope Discrimination in Diverse Peanut (<I>Arachis</I>) Germplasm
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 1986
VL  - 13
IS  - 6
SP  - 803
EP  - 816
KW  - 
UR  - https://doi.org/10.1071/PP9860803 
N2  - Stable carbon isotope discrimination (&#916;) showed both intraspecific and interspecific variations in leaves collected from field plants representing a wide range of peanut germplasm grown in similar environments. It was predicted, on the basis of theoretical models relating &#916; and water-use efficiency (W), that there could be as much as 60% variation in W. The &#916; of leaf material was used as a guide to select peanut genotypes for testing, in the glasshouse, for a correlation between &#916; and W. Pot plants of nine peanut genotypes were grown in conditions of unlimited water availability or very restricted water supply. Water-use efficiency and &#916; of leaves was measured on all plants. A strong correlation (r = -0.81) was found between &#916; and W. Water-use efficiency actually varied as much as twofold. Carbon content and &#916; were measured in all parts of some plants. The &#916; values of all parts were highly correlated with and therefore well-represented by the &#916; of the leaves. Calculation of W on a molar basis removes variation associated with carbon content of dry matter. On this basis, W was correlated with the discrimination against 13C of the whole plant. The link between &#916; and W is not direct but the strong correlation between &#916; and W suggests that other factors, which are discussed, do not interfere greatly. The data provide more evidence that &#916; might be used as a selection technique for W in C3 species. 
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