Biological nitrification inhibition by root exudates of native species, Hibiscus splendens and Solanum echinatum

• Published in: PeerJ (San Francisco, CA) Vol. 6; p. e4960
• Main Authors: Janke, Chelsea K, Wendling, Laura A, Fujinuma, Ryosuke
• Format: Journal Article
• Language: English
• Published: United States PeerJ, Inc 19.06.2018; PeerJ Inc
• Subjects: Adaptation; Biological nitrification inhibition; Conservation Biology; Developmental stages; Ecology; Ecosystem biology; Ecosystems; Exudates; Flowers & plants; Germination; Hibiscus splendens; Indigenous species; Native species; Natural Resource Management; Nitrification; Nitrogen; Nutrient cycling; Organic acids; Phosphorus; Physiology; Plant Science; Rhizosphere; Rice; Root exudates; Solanum echinatum; Sorghum; Sorghum bicolor; Australia; Nutrient cycling; Biological nitrification inhibition; Ecology; Root exudates; Nitrogen; Native species
• ISSN: 2167-8359; 2167-8359
• DOI: 10.7717/peerj.4960

Australian native species grow competitively in nutrient limited environments, particularly in nitrogen (N) limited soils; however, the mechanism that enables this is poorly understood. Biological nitrification inhibition (BNI), which is the release of root exudates into the plant rhizosphere to inhibit the nitrification process, is a hypothesized adaptive mechanism for maximizing N uptake. To date, few studies have investigated the temporal pattern and components of root exudates by Australian native plant species for BNI. This study examined root exudates from two Australian native species, and and contrasted with exudates of , a plant widely demonstrated to exhibit BNI capacity. Root exudates were collected from plants at two, four, and six weeks after transplanting to solution culture. Root exudates contained three types of organic acids (OAs), oxalic, citric and succinic acids, regardless of the species. However, the two Australian natives species released larger amount of OAs in earlier development stages than . The total quantity of these OAs released per unit root dry mass was also seven-ten times greater for Australian native plant species compared to . The root exudates significantly inhibited nitrification activity over six weeks' growth in a potential nitrification assay, with ( . 81% inhibition) > ( . 80% inhibition) > ( . 78% inhibition). The narrow range of BNI capacity in the study plants limited the determination of a relationship between OAs and BNI; however, a lack of correlation between individual OAs and inhibition of nitrification suggests OAs may not directly contribute to BNI. These results indicate that Australian native species generate a strongly N conserving environment within the rhizosphere up to six weeks after germination, establishing a competitive advantage in severely N limited environments.