Short-term exposure to elevated CO2 stimulates growth and metabolic responses that alleviate early-stage iron deficiency symptoms in soybean

• Published in: Journal of plant interactions Vol. 17; no. 1; pp. 50 - 59
• Main Authors: Soares, José C., Pintado, Manuela, Vasconcelos, Marta W.
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 01.01.2022; Taylor & Francis Ltd; Taylor & Francis Group
• Subjects: acute exposure; Agricultural production; Barley; Biomass; Carbon dioxide; chlorophyll; Climate change; Dry weight; elevated CO; elevated co2; fe-deficiency; Gene expression; Iron; Iron deficiency; Leaves; Magnesium; Manganese; Metabolic response; Metabolism; Nutrient deficiency; Photosynthesis; Physiology; phytomass; Plant biomass; Plants; Roots; soybean; Soybeans; Stomata; Stomatal conductance; Transpiration; Water use; water use efficiency; Zinc
• ISSN: 1742-9145; 1742-9153; 1742-9153
• DOI: 10.1080/17429145.2021.2011445

Elevated CO 2 (eCO 2 ) increase plant biomass and might lead to nutritional losses. The results showed that eCO 2 under Fe-deficiency stimulates root dry weight from 0.37-0.80 g plant −1 and shoot dry weight from 0.82-2.10 g plant −1 , without compromising root/shoot ratio. Besides, eCO 2 improved the chlorophyl content of Fe-deficient plants. However, downregulation of photosynthesis, reduction in stomatal conductance and transpiration rate, and an increase in water-use efficiency was observed due to eCO 2 . Moreover, under Fe-deficiency, eCO 2 decreased K and Mg in roots, and Mg in leaves, whereas increased P and Zn in roots and leaves. In Fe-sufficient plants, eCO 2 increased K, P, Mn, Zn and Fe in leaves and did not change the concentration in roots. The Fe-deficiency-induced responses in roots, including the increase in FCR activity, and the expression of Fe-uptake genes were stimulated by eCO 2 , but were not sufficient to increase Fe concentration in Fe-deficient plants.