Nitrogen fertilisation reduces sink strength of poplar ectomycorrhizae during recovery after drought more than phosphorus fertilisation
| Autor: | S. Mühlhans, U. T. Nickel, J. B. Winkler, Franz Buegger, J.C. Munch, Karin Pritsch |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
0301 basic medicine Soil Science chemistry.chemical_element Plant Science Cellulase Biology Photosynthesis 01 natural sciences Sink (geography) 03 medical and health sciences chemistry.chemical_compound Ectomycorrhizae Fertilisation geography geography.geographical_feature_category fungi food and beverages Plant physiology Nitrogen 030104 developmental biology chemistry Agronomy Chlorophyll biology.protein 010606 plant biology & botany |
| Zdroj: | Plant and Soil. 419:405-422 |
| ISSN: | 1573-5036 0032-079X |
| DOI: | 10.1007/s11104-017-3354-2 |
| Popis: | Drought reduces the carbon (C) flux from leaves (source) to mycorrhizal roots (sink); however, during recovery from drought, C flux exceeds the levels observed in irrigated controls. This process could be source- or sink-controlled. We studied this source–sink relationship in an agronomically used poplar clone grown at different levels of nitrogen (N) and phosphorus (P) fertilisation as used in silvoarable agroforestry systems. We conducted a fully factorial pot experiment combining four fertiliser and two drought regimes. Gas exchange and chlorophyll and flavonol indices were regularly monitored. One week after rewatering, we performed 13CO2 pulse labelling. At harvest, enzyme activities of ectomycorrhizal root tips were determined. After one week of recovery, we observed an excess in C allocation to ectomycorrhizae (ECM) in non-N-fertilised treatments. However, net photosynthesis only recovered to the level of continuously irrigated controls. Drought increased chitinase, cellulase, phosphatase and peptidase activities, but the latter only in N-fertilised treatments. We add evidence that the allocation of recently assimilated C is most likely sink-controlled. Less C allocation to recovering ECM supplied with fertiliser may be either due to better nutritional status and hence higher stress tolerance, or due to partitioning between above and below-ground sinks. |
| Databáze: | OpenAIRE |
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