Elevated CO2 and phosphorus deficiency interactively enhance root exudation in Lupinus albus L
Autor: | Caixian Tang, Jian Jin, Dario Stefanelli, James B. O’Sullivan, Tim Plozza |
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Rok vydání: | 2021 |
Předmět: |
0106 biological sciences
chemistry.chemical_classification biology Soil Science Plant physiology Positive interaction Fructose 04 agricultural and veterinary sciences Plant Science biology.organism_classification 01 natural sciences Lupinus chemistry.chemical_compound Animal science Nutrient chemistry 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Phosphorus deficiency Sugar 010606 plant biology & botany Organic acid |
Zdroj: | Plant and Soil. 465:229-243 |
ISSN: | 1573-5036 0032-079X |
Popis: | Rising atmospheric CO2 levels associated with climate change increase plant nutrient demands. However, few studies have examined the interactions of atmospheric CO2 and P supply on root exudation which plays a crucial role in mobilising non-labile P in soil. This study aimed to examine the interactive effects of elevated CO2 and P deficiency on root exudation of organic acid anions and sugars over time. White lupin (Lupinus albus L.) was grown at 1, 5 and 50 µM P in solution culture under ambient (380 ppm) and elevated (700 ppm) CO2 levels. Root exudates were collected after 3, 4, 5 and 6 weeks of treatment, and organic acid anions and sugars were quantified using liquid chromatography-mass spectrometry. Elevated CO2 and P deficiency positively interacted to enhance citrate exudation between 3 and 5 weeks of growth, while malate was only sporadically affected by elevated CO2 and fumarate remained unaffected. Elevated CO2 also increased exudation of glucose and fructose with larger increases being observed in P-deficient plants, which was largely constrained after 4 weeks. Elevated CO2 had no effect on exudation rates as plants matured. The positive interaction between CO2 and P deficiency led to increases in organic acid anion and sugar exudation, indicating that rising atmospheric CO2 levels could allow plants to access greater amounts of non-labile P when faced with P deficiency thereby reducing their reliance on non-renewable fertiliser inputs. |
Databáze: | OpenAIRE |
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