Elevated CO2 reduces whole transpiration and substantially improves root production of cassava grown under water deficit. Issue 12 (15th October 2018)

• Record Type: Journal Article
• Authors: Cruz, Jailson L.; LeCain, Daniel R.; Alves, Alfredo A. C.; Coelho Filho, Mauricio Antônio; Coelho, Eugênio Ferreira
• Is Part Of: Archives of agronomy and soil science. Volume 64:Issue 12(2018)
• Page Start: 1623
• Page End: 1634
• Publication Date: 2018-10-15
• Subjects: Drought -- photosynthesis -- harvest index -- water-use efficiency -- climate change; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2018.1446523
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: We evaluated the possibility of elevated CO2 concentration ([CO2 ]) to reduce the negative effect of drought on growth and physiological parameters of cassava ( Manihot esculenta Crantz). Plants were grown with 390 ppm or 750 ppm of CO2, under well-watered or under water deficit conditions. The study was conducted in a climate-controlled greenhouse using 14 L pots, for 100 days. For any value of fraction of transpirable soil water (FTSW) the carbon assimilation was always higher for plants grown under elevated [CO2 ]. Still, elevated [CO2 ] reduced the negative effect of drought on transpiration, water use efficiency, all growth measures and harvest index. Elevated [CO2 ] increased the dry matter of tuber roots (DMTR) of well-watered plants by 17.4%. The DMTR of plants grown under water deficit were 124.4 g and 58.9 g, respectively, for plants under elevated and ambient CO2, an increase of 112%. Thus, the CO2 effect was relatively stronger to the production of tuberous roots when cassava were subjected to water-deficit. Our results suggest that cassava tuber production might be resilient to changes in precipitation that will accompany higher atmospheric CO2 and reinforce cassava as a specie that can significantly contribute to mitigate hunger in a changing climate environment.