Abstract
Background and aims
Clonal integration between ramets under heterogeneous environment has crucial implications for the clonal plants, is widely distribute in the arid ecosystems because it helps to transfer water and nutrients from the habitats with high moisture or fertility to lower ones. How the clonal integration affects the plant productivity and nutrient uptake under heterogeneous environment still remains unclear.
Methods
Leymus chinensis and the neighbouring Stipa grandis grew at two soil moisture environments (homogeneous water content: 8% in both the donor and recipient compartments; or heterogeneous water content: 16% in the donor and 8% in the recipient compartments) and two root connections (connected or severed L. chinensis). After 4 weeks of growth, the plants of donor L. chinensis were labelled with either 15NH4+ or 15NO3−.
Results
The biomass of recipient L. chinensis and S. grandis and N uptake rate by S. grandis were larger under heterogeneous water water content with connected roots than that with severed roots. The NO3− uptake rate was 40 times faster than that of NH4+ by all the plants irrespective of soil moisture condition and root connection. Consequently, clonal integration increased N translocation from donor to recipient ramets and subsequent N utilization by neighbouring S. grandis. Unexpectedly, NH4+ uptake by recipient L. chinensis with severed roots was 1.5 times faster than that with connected roots under homogeneous environment, this largely ascribed to that the translocation of NH4+ from donor to recipient L. chinensis through common mycorrhizal networks (CMNs).
Conclusions
Clonal integration increases plant biomass and N uptake in heterogeneous environment and weakens them in homogeneous environment. Plants prefer direct NO3− uptake, whereas arbuscular mycorrhizal fungi preferentially translocate NH4+ to recipient clonal ramets. These findings indicate that clonal plants rely on the clonal integration of clonal roots and CMNs to acquire N from soil.
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This research was supported by Science and Technology Major Project of Inner Mongolia in China (Grant No. 2021ZD0011-04), the National Natural Science Foundation of China (Grant No. 42277319), National Key Research and Development Program of China (Grant No. 2022YFF1302804), Inner Mongolia Science and Technology Plan (Grant No. 2019GG008), and the Government Program of Competitive Growth of Kazan Federal University, and of the RUDN University Strategic Academic Leadership Program.
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Tian, Y., Cui, Y., Wen, S. et al. Clonal integration under heterogeneous water environment increases plant biomass and nitrogen uptake in a temperate steppe. Plant Soil 491, 145–159 (2023). https://doi.org/10.1007/s11104-023-06163-8
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DOI: https://doi.org/10.1007/s11104-023-06163-8