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Lanthanum nitrate improves phosphorus-use efficiency and tolerance to phosphorus-deficiency stress in Vigna angularis seedlings

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Abstract

Here, we examined the effects of La3+ on growth, photosynthetic ability, and phosphorus-use efficiency (PUE) in various organs of adzuki bean (Vigna angularis) seedlings. La3+ substantially alleviated P-deficiency symptoms. Treatment of young seedlings with La3+ at 150 mg L−1 effectively improved PUE in roots, stems, and leaves via the regulation of root elongation and activation of root physiological responses to P-deficiency, e.g., root activity and acid phosphatase (APase) activity. Root hydraulic conductivity (Lp) was also examined to elucidate the role of La3+ in the relationship between water and nutrition transport. We confirmed that La3+ increased the level of antioxidant protective enzymes, including superoxide dismutase (SOD) and peroxidase (POD), while it significantly decreased malondialdehyde (MDA) content. The use of La3+ to reduce photosynthesis damage under P-deficiency was examined. The negative effects of P-deficiency on net photosynthetic rate (Pn), transpiration rate (Tr), maximum photochemical efficiency (Fv/Fm), and chlorophyll content in leaves were alleviated by La3+ treatment. These results clarify the regulatory functions of La3+ in stress tolerance and P utilization in adzuki bean seedlings.

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Funding

This study received financial support from the National Science and Technology Supporting Programs (2015BAD22B01) and the Special Funds for Scientific Research Programs of the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau (A314021403-CS).

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Correspondence to Suiqi Zhang.

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The authors declare that they have no conflict of interest.

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Handling Editor: Bhumi Nath Tripathi

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Lian, H., Qin, C., Zhang, L. et al. Lanthanum nitrate improves phosphorus-use efficiency and tolerance to phosphorus-deficiency stress in Vigna angularis seedlings. Protoplasma 256, 383–392 (2019). https://doi.org/10.1007/s00709-018-1304-3

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  • DOI: https://doi.org/10.1007/s00709-018-1304-3

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