Association of stomatal conductance and root distribution with water use efficiency of peanut under different soil water regimes

Songsri, P. and Jogloy, S. and Junjittakarn, J. and et al, . (2013) Association of stomatal conductance and root distribution with water use efficiency of peanut under different soil water regimes. Australian Journal of Crop Science, 7 (7). pp. 948-955.

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Drought is a major abiotic stress limiting crop productivity worldwide especially in rain-fed areas. Plant physiologists and crop breeders have aimed to better understand the mechanisms underlying drought resistance to increase the success in breeding for drought resistant crops. The objectives of this study were to (i) determine the effects of different soil water availability on stomatal behavior and water use efficiency (WUE) of diverse peanut genotypes and (ii) to investigate associations between surrogate physiological traits for drought tolerance. Eleven peanut genotypes and three soil moisture levels (field capacity, 2/3 available water and 1/3 available water) were assigned in a split plot design with four replications for two experiments. WUE, stomatal traits and root distribution (indicated by root length density, RLD, in the soil layers at 0-40 cm and 40-100 cm depths) were measured at 37, 67 and 97 days after sowing (DAS). Drought reduced stomatal aperture and stomatal conductance but increased WUE. Differential responses among peanut genotypes were observed for WUE, and stomatal conductance. ICGV 98300 and Tifton 8 had high stomatal conductance and WUE under moderate water stress. Stomatal conductance and %RLD(40-100 cm) play an important roles in increasing WUE under mild drought stress.

Item Type: Article
Additional Information: Grateful acknowledgement is made to the Royal Golden Jubilee Ph.D. Program (Grant no. PHD/0190/2544) and the Peanut and Jerusalem Artichoke Improvement for Functional Food Research Group. Assistance was also received from the Plant Breeding Research Center for Sustainable Agriculture and Khon Kaen University Research Fund. An acknowledgement is extended to Khon Kaen University and the faculty of Agriculture for providing financial support for manuscript preparation activities. We also thank Miss Hannah Wright for assistance with editing our draft paper.
Uncontrolled Keywords: Drought tolerance, Gas exchange, Stomatal behavior, Water stress, WUE
Author Affiliation: Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University, Thailand.
Subjects: Soil Science and Microbiology
Plant Physiology and Biochemistry > Plant Physiology
Divisions: Groundnut
Depositing User: Mr Arbind Seth
Date Deposited: 02 Sep 2013 05:30
Last Modified: 02 Sep 2013 05:30
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