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Mycorrhizal symbiosis induces plant carbon reallocation differently in C3 and C4 Panicum grasses
- Řezáčová, Veronika, Slavíková, Renata, Zemková, Lenka, Konvalinková, Tereza, Procházková, Věra, Šťovíček, Václav, Hršelová, Hana, Beskid, Olena, Hujslová, Martina, Gryndlerová, Hana, Gryndler, Milan, Püschel, David, Jansa, Jan
- Plant and soil 2018 v.425 no.1-2 pp. 441-456
- C3 photosynthesis, C3 plants, C4 photosynthesis, C4 plants, Panicum, carbon, carbon dioxide, fertilizer application, fungi, grasses, harvesting, isotope labeling, phosphorus, phosphorus fertilizers, vesicular arbuscular mycorrhizae
- AIMS: Although arbuscular mycorrhizal symbiosis is common in many plants with either C₃ or C₄ photosynthesis, it remains poorly understood whether photosynthesis type has any significant impact on carbon (C) fluxes in mycorrhizal plants. Thus, we compared mycorrhizal and non-mycorrhizal (NM) plants belonging to Panicum bisulcatum (C₃) to its congeneric P. maximum (C₄). METHODS: Plants were or were not exposed to arbuscular mycorrhiza (AM) fungal inoculation and/or phosphorus (P) fertilization. Plants’ C budgets were assembled based on ¹³CO₂ pulse-chase labelling and sequential harvesting. RESULTS: Mycorrhizal plants allocated on average 3.9% more recently fixed C belowground than did their NM counterparts. At low P, mycorrhizal C₃-Panicum plants allocated less C to aboveground respiration as compared to their respective NM controls. In contrast, mycorrhizal C₄-Panicum increased the rates of photosynthesis and allocated more C to aboveground respiration than the respective NM controls. At high P, the differences were less prominent. CONCLUSIONS: We demonstrated consistent differences in aboveground C allocation due to AM symbiosis formation in congeneric C₃ and C₄ grasses. Both grasses benefited from AM symbiosis in terms of improved P uptake (at least at low P). These results advocate a holistic (whole-plant) perspective in studying C fluxes in mycorrhizal plants.