内翻性腭裂
生物
生物量(生态学)
外生菌根
磷
营养物
菌根
植物
殖民地化
生物量分配
园艺
共生
农学
生态学
化学
细菌
有机化学
遗传学
作者
Huidong Shi,Ulrike Lipka,Andrea Polle
出处
期刊:Tree Physiology
[Oxford University Press]
日期:2024-06-25
标识
DOI:10.1093/treephys/tpae074
摘要
Abstract Tree growth is often limited by phosphorus (P) availability. The trade-off between P homeostasis and growth is unknown. Ectomycorrhizal (EM) fungi facilitate P availability but this trait varies among different fungal species and isolates. Here, we tested the hypotheses that (i) colonization with EMF boosts plant growth under P-limited conditions and that (ii) the poplars show P homeostasis because increased P uptake is used for growth and not for P accumulation in the tissues. We used two P treatments (HP: 64 μM Pi, LP: 0.64 μM Pi in the nutrient solution) and four fungal treatments (Paxillus involutus MAJ, Paxillus involutus NAU, Laccaria bicolor dikaryon LBD, Laccaria bicolor monokaryon LBM) in addition to non-inoculated poplar plants (NI) to measure growth, biomass, gas exchange and P contents. HP stimulated growth compared with LP conditions. Poplars colonized with MAJ, NAU and NI showed higher growth and biomass production than those with LBD or LBM. Photosynthesis rates of poplars with lower biomass production were similar to or higher than those of plants with higher growth rates. The tissue concentrations of P were higher under HP than LP conditions and rarely affected by ectomycorrhizal colonization. Under LP, the plants produced 44% greater biomass per unit of P than under HP. At a given P supply, the tissue concentration was stable irrespective of the growth rate indicating P homeostasis. L. bicolor caused growth inhibition, irrespective the P availabilities. These results suggest that in young poplars distinct species-specific ectomycorrhizal traits overshadowed potential growth benefits.
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