CO2 concentration and water availability alter the organic acid composition of root exudates in native Australian species
| العنوان: | CO2 concentration and water availability alter the organic acid composition of root exudates in native Australian species |
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| المؤلفون: | Hasegawa, Shun, Ryan, Megan H., Power, Sally A. |
| المصدر: | Plant and Soil. 485:507-524 |
| مصطلحات موضوعية: | Carboxylates, Cluster roots, Exudation, Hakea sericea, Microlaena stipoides, Phosphorus |
| الوصف: | Purpose: Root exudation of organic acids (OAs) facilitates plant P uptake from soil, playing a key role in rhizosphere nutrient availability. However, OA exudation responses to CO2 concentrations and water availability remain largely untested.Methods: We examined the effects of CO2 and water on OA exudates in three Australian woodland species: Eucalyptus tereticornis, Hakea sericea and Microlaena stipoides. Seedlings were grown in a glasshouse in low P soil, exposed to CO2 (400 ppm [aCO2] or 540 ppm [eCO2]) and water treatments (100% water holding capacity [high-watered] or 25–50% water holding capacity [low-watered]). After six weeks, we collected OAs from rhizosphere soil (OArhizo) and trap solutions in which washed roots were immersed (OAexuded).Results: For E. tereticornis, the treatments changed OArhizo composition, driven by increased malic acid in plants exposed to eCO2 and increased oxalic acid in low-watered plants. For H. sericea, low-watered plants had higher OAexuded per plant (+ 116%) and lower OArhizo per unit root mass (–77%) associated with larger root mass but fewer cluster roots. For M. stipoides, eCO2 increased OAexuded per plant (+ 107%) and per unit root mass (+ 160%), while low-watered plants had higher citric and lower malic acids for OArhizo and OAexuded: changes in OA amounts and composition driven by malic acid were positively associated with soil P availability under eCO2.Conclusion: We conclude that eCO2 and altered water availability shifted OAs in root exudates, modifying plant–soil interactions and the associated carbon and nutrient economy. |
| وصف الملف: | electronic |
| URL الوصول: | https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-204068 https://doi.org/10.1007/s11104-022-05845-z https://umu.diva-portal.org/smash/get/diva2:1732189/FULLTEXT02.pdf |
| قاعدة البيانات: | SwePub |
Find this article in full text from Springer Verlag. | تدمد: | 0032079X 15735036 |
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| DOI: | 10.1007/s11104-022-05845-z |