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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
RESEARCH ARTICLE

Warming alters the positive impact of elevated CO2 concentration on cotton growth and physiology during soil water deficit

Katrina J. Broughton A B E , Renee A. Smith C , Remko A. Duursma C , Daniel K. Y. Tan B , Paxton Payton D , Michael P. Bange A B and David T. Tissue C
+ Author Affiliations
- Author Affiliations

A CSIRO Agriculture, Locked Bag 59, Narrabri, NSW 2390, Australia.

B Faculty of Agriculture and Environment, Plant Breeding Institute, School of Life and Environmental Sciences, University of Sydney, Sydney, NSW 2006, Australia.

C Hawkesbury Institute for the Environment, Western Sydney University, Richmond NSW 2753, Australia.

D United States Department of Agriculture, Cropping Systems Research Laboratory, Lubbock, TX 79415, USA.

E Corresponding author. Email: katie.broughton@csiro.au

Functional Plant Biology 44(2) 267-278 https://doi.org/10.1071/FP16189
Submitted: 23 May 2016  Accepted: 10 October 2016   Published: 23 November 2016

Abstract

Alterations in climate factors such as rising CO2 concentration ([CO2]), warming and reduced precipitation may have significant impacts on plant physiology and growth. This research investigated the interactive effects of elevated [CO2], warming and soil water deficit on biomass production, leaf-level physiological responses and whole-plant water use efficiency (WUEP) in cotton (Gossypium hirsutum L.). Cotton was grown in the glasshouse under two [CO2] treatments (CA, 400 µL L–1; CE, 640 µL L–1) and two temperature treatments (TA, 28°C : 17°C day : night; TE, 32°C : 21°C day : night). Plants were subjected to two progressive water deficit cycles, with a 5-day recovery period between the water deficit periods. CE increased vegetative biomass and photosynthetic rates, and decreased stomatal conductance in TA; however, these responses to CE were not evident under TE. CE increased whole-plant water loss under TA, but increased WUEp, whereas increased whole-plant water loss in TE decreased WUEp regardless of atmospheric [CO2]. CE may provide some positive growth and physiological benefits to cotton at TA if sufficient water is available but CE will not mitigate the negative effects of rising temperature on cotton growth and physiology in future environments.

Additional keywords: climate change, drought, elevated temperature Gossypium hirsutum, water deficit stress.


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