Crop growth, water-use efficiency and carbon isotope discrimination in groundnut (Arachis hypogaea L.) genotypes under end-of season drought conditions

Rao, R. C. Nageswara, Williams, J. H., Wadia, K. D. R., Hubick, K. T. and Farquhar, G. D. (1993) Crop growth, water-use efficiency and carbon isotope discrimination in groundnut (Arachis hypogaea L.) genotypes under end-of season drought conditions. Annals of Applied Biology, 122 213-222. doi:10.1111/j.1744-7348.1993.tb04041.x


Author Rao, R. C. Nageswara
Williams, J. H.
Wadia, K. D. R.
Hubick, K. T.
Farquhar, G. D.
Title Crop growth, water-use efficiency and carbon isotope discrimination in groundnut (Arachis hypogaea L.) genotypes under end-of season drought conditions
Formatted title
Crop growth, water-use efficiency and carbon isotope discrimination in groundnut (Arachis hypogaea L.) genotypes under end-of season drought conditions 
Journal name Annals of Applied Biology   Check publisher's open access policy
ISSN 0003-4746
1744-7348
Publication date 1993
Sub-type Article (original research)
DOI 10.1111/j.1744-7348.1993.tb04041.x
Open Access Status
Volume 122
Start page 213
End page 222
Total pages 10
Place of publication Chichester, West Sussex, United Kingdom
Publisher Wiley-Blackwell
Language eng
Abstract Ten groundnut genotypes were grown under adequately irrigated conditions or subjected to drought during the pod filling phase (83-113 days after sowing) in a medium deep Alfisol at the ICRISAT Centre during the 1986-1987 post-rainy season. Crop growth was measured in both treatments, but transpiration (T) and water-use efficiency (W) were quantified only in the drought treatment. Leaf samples from both treatments were assayed for discrimination against (CO2)-C-13 fixed in leaves (DELTA) to examine the relationships between DELTA, crop growth, and W under field conditions. The shoot dry matter accumulated during the period of drought (Y) ranged from 72-150 g m-2 and was closely related to transpiration. This indicates scope for selection of traits and practices to increase T. Water-use efficiencies ranged from 1.38-2.50 g kg-1 and were inversely related to DELTA in eight out of the 10 genotypes. For the other two genotypes, there was evidence that T was under-estimated by field measurements. Water-use efficiency and transpiration were not correlated suggesting that these two traits might be combined through breeding. Variation between genotypes was greatest for the partitioning of total dry matter to pods (73%), followed by water-use efficiency (31%) and transpiration (29%). Crop growth rates were negatively related to DELTA under irrigated conditions but not under drought.
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
 
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Created: Wed, 25 Jun 2014, 18:34:07 EST by Dr Rao Rachaputi on behalf of Centre for Plant Science