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

Rao, R.C.N. and Williams, J.H. and Wadia, K.D.R. and 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 (2). pp. 357-367.

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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 (7) and water-use efficiency (W) were quantified only in the drought treatment. Leaf samples from both treatments were assayed for discrimination against 13CO2 fixed in leaves (Δ) to examine the relationships between Δ, 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 Δ in eight out of the 10 genotypes. For the other two genotypes, there was evidence that T was underestimated 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 Δ under irrigated conditions but not under drought.

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru P.O., Andhra Pradesh 502 324, India
Subjects: Crop Improvement > Plant Breeding
Plant Physiology and Biochemistry > Plant Physiology
Divisions: Groundnut
Depositing User: Sandhya Gir
Date Deposited: 17 Nov 2010 17:11
Last Modified: 17 Nov 2010 17:14
Official URL: http://dx.doi.org/10.1111/j.1744-7348.1993.tb04041...
URI: http://eprints.icrisat.ac.in/id/eprint/658

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