Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions

Wright, G. C., Nageswara Rao, R. C. and Farquhar, G. D. (1994) Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions. Crop Science, 34 1: 92-97. doi:10.2135/cropsci1994.0011183X003400010016x


Author Wright, G. C.
Nageswara Rao, R. C.
Farquhar, G. D.
Title Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions
Journal name Crop Science   Check publisher's open access policy
ISSN 1435-0653
Publication date 1994-01
Sub-type Article (original research)
DOI 10.2135/cropsci1994.0011183X003400010016x
Open Access Status
Volume 34
Issue 1
Start page 92
End page 97
Total pages 6
Place of publication Madison, WI, United States
Publisher Crop Science Society of America
Language eng
Formatted abstract
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.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
Versions
Version Filter Type
Citation counts: Google Scholar Search Google Scholar
Created: Wed, 25 Jun 2014, 18:20:43 EST by Dr Rao Rachaputi on behalf of Centre for Plant Science