|ECHEVARRIA LAZA, HAYDEE - Texas Tech University|
|ROWLAND, DIANE - University Of Florida|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 2/23/2016
Publication Date: 2/2/2016
Citation: Echevarria Laza, H.J., Baker, J.T., Gitz, D.C., Mahan, J.R., Rowland, D., Payton, P.R. 2016. Interactive effects of deficit irrigation, elevated temperature, and elevated [CO2] on peanut growth in low irrigation production settings [abstract]. Meeting Abstract. 1(17):6.
Technical Abstract: Improving crop water use (both agronomic and biological) is critical to most cropping areas around the world. The persistance of adverse climate conditions and predicted decreased availability of fresh water for crop production are the largest challenges to agriculture in the coming decades. Our primary research objectives are to understand the physiology of abiotic stress responses in crop plants. Specifically, we are interested in those stresses that occur in low-irrigation and rainfed production systems. Our goals are to develop stress-tolerant cultivars and production models that mitigate the negative effects of deficit irrigation and elevated temperature stress. We have initiated a project to investigate the interactive effects of water deficit and elevated temperature with elevated [CO2]. Peanut breeding line C7616 was grown in Canopy Evapotranspiration and Assimilation (CETA) chambers at 400 and 650 ppm CO2 in the field during the 2015 cropping season. The CETA chambers are portable open, transparent chamber systems for measuring whole canopy gas-exchanges and are capable of controlling [CO2] and temperature. The positive effect of elevated [CO2] was enough to ameliorate the negative effect of three episodic drought events during the growing season, leading to a significant increase in above-ground biomass and seed yield compared to ambient growth conditions. Overall, elevated [CO2] stimulated canopy net assimilation (Anet), transpiration (E), and night respiration (Rd) by 41%, 57%, and 13% respectively, compared to plants grown under ambient conditions. During the water deficit and recovery phases, the plants grown under elevated [CO2] maintained daily Anet, E, and Rd, while plants under ambient conditions show significant decreases in these parameters. A detailed analysis of the diurnal responses and impact of water-deficit and stress recovery will be presented.