eprintid: 3129
rev_number: 9
eprint_status: archive
userid: 65
dir: disk0/00/00/31/29
datestamp: 2011-10-23 08:05:51
lastmod: 2011-10-23 08:05:51
status_changed: 2011-10-23 08:05:51
type: article
metadata_visibility: show
contact_email: Library-ICRISAT@cgiar.org
item_issues_count: 0
creators_name: Wright, G C
creators_name: Nageswara Rao, R C
creators_name: Farquhar, G D
icrisatcreators_name: Nageswara Rao, R C
affiliation: Res. School of Biological Sci.(Canberra)
affiliation: ICRISAT(Patancheru)
country: Australia
country: India
title: Water-use efficiency and carbon isotope discrimination in peanut under water deficit conditions
ispublished: pub
subjects: s1.3
full_text_status: restricted
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.


date: 1994
date_type: published
publication: Crop Science
volume: 34
number: 1
publisher: Crop Science Society of America
pagerange: 92-97
refereed: TRUE
issn: 0011-183X
official_url: http://dx.doi.org/10.2135/cropsci1994.0011183X003400010016x
related_url_url: 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
related_url_type: author
funders: International Crops Research Institute for the Semi-Arid Tropics
funders: Australian Centre for International Agricultural Research
citation:   Wright, G C and 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).  pp. 92-97.  ISSN 0011-183X     
document_url: http://oar.icrisat.org/3129/1/JA_1389.pdf