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Effects of Nitrogen and Phosphorus Limitation on the Growth and Phosphorus Allocation of Alfalfa (Medicago sativa L.)

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Abstract

As phosphorus (P) is one of the most limiting elements for crop growth and development, investigating the P allocation strategy of legume species with the nitrogen (N)-fixing functions is particularly important under N and P limitation. In this study, a pot experiment in a greenhouse was conducted in 2021 with three nutrient application treatments including N and P balanced situations, N limitation, and P limitation. The growth, photosynthetic properties, and P content of three organs (leaf, stem, and root P content) and four fractions within leaves (metabolic, nucleic, lipid, and residual P content) were measured for two cultivars of the legume forage crop alfalfa. In our results, plant growth and photosynthetic capacity all decreased under nutrient limitation (P < 0.05), but photosynthetic P-use efficiency was not significantly changed under P limitation. The further analysis showed that P allocation to leaves (ranged from 22% to 29%) significantly decreased but allocations to stems (ranged from 32% to 45%) or roots (ranged from 30% to 43%) increased under nutrient limitation, and the proportions of leaf metabolic P (ranged from 45% to 75%) and nucleic acid P (ranged from 15% to 20%) were increased under P and N limitations (P < 0.05), respectively. In addition, leaf acid phosphatase activity was strongly negatively correlated with leaf residual P (r =  − 0.884, P < 0.01). Our results revealed that P allocation of alfalfa was changed by nutrient limitation to increase plant P-use efficiencies, and that the allocation strategy also differed between N and P limitation, in which leaf acid phosphatase played an important role in conversion among leaf P fractions.

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Data Availability

The data that support the findings of this study are available from the corresponding author XL upon reasonable request.

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Funding

This study was supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province (Yangzhou University) (Grant number: KYCX22_3559).

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Contributions

XL conceived and designed the experiment; YH and CQ conducted these experiments; YH and XL wrote the manuscript and further revision; XZ, DL, JL, and LW helped in the greenhouse and laboratory experiments. YH and CQ contributed equally.

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Correspondence to **n’e Li.

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The authors declare no competing interests.

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Yafei Hu and Cheng Qian are contributed equally to this work and share first authorship.

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Hu, Y., Qian, C., Zhao, X. et al. Effects of Nitrogen and Phosphorus Limitation on the Growth and Phosphorus Allocation of Alfalfa (Medicago sativa L.). J Soil Sci Plant Nutr 24, 343–353 (2024). https://doi.org/10.1007/s42729-023-01541-8

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  • DOI: https://doi.org/10.1007/s42729-023-01541-8

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