Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer
Phosphorus (P) is among the most intractable constraints on plant fertility, particularly in acidic soils with high P fixation capacities. The effects of nutrient limitation and the adaptive strategies of plants in infertile soils are central topics in plant ecology. The development of tree cultivar...
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MDPI AG
2022-10-01
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| Series: | Forests |
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| Online Access: | https://www.mdpi.com/1999-4907/13/11/1769 |
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| author | Xianhua Zou Qingqing Liu Zhijun Huang Sitong Chen Pengfei Wu Xiangqing Ma Liping Cai |
| author_facet | Xianhua Zou Qingqing Liu Zhijun Huang Sitong Chen Pengfei Wu Xiangqing Ma Liping Cai |
| author_sort | Xianhua Zou |
| collection | DOAJ |
| description | Phosphorus (P) is among the most intractable constraints on plant fertility, particularly in acidic soils with high P fixation capacities. The effects of nutrient limitation and the adaptive strategies of plants in infertile soils are central topics in plant ecology. The development of tree cultivars with greater P use efficiency (PUE), defined as the ability of a tree to grow and be productive in soils with reduced P availability, would substantially improve forest development. The ability of plants to redistribute and transfer P across fractions determines their adaptability to P limitations. However, the mechanisms of P utilization and transport remain unknown in Chinese fir (<i>Cunninghamia lanceolata</i> (Lamb.) Hook.) from the perspective of P fraction distribution. In this study, we investigated the distribution and translocation patterns of exogenous P and different P fractions in the M1 Chinese fir, which was identified as exhibiting high P-deficient resistance ability and maintaining higher yield under low P stress relative to the average clones, using <sup>32</sup>P tracking, which can accurately trace the migration pathways of exogenous P after plant absorption. We found that exogenous P in the roots was higher than in the stems or leaves under low-P conditions in which the amount of the exogenous P absorbed by M1 was significantly reduced. Under low-P conditions, the plants optimized P allocation, which led to higher PUE than under high-P conditions, with the highest PUE in the leaves, followed by the stems and roots. The M1 clone maintained a high ratio of soluble P (i.e., inorganic P and ester P) in its leaves and stems, which improved P mobility and recycling under the conditions of limited P. In the roots, the P fractions shifted from soluble inorganic P and ester P to insoluble P (i.e., nucleic P), but the total P concentration was relatively stable, which may ensure root growth and exogenous P absorption under the conditions of limited P. Our results confirm that the M1 Chinese fir reduces P demand, optimizes the allocation of P among P fractions, and increases PUE to maintain aboveground productivity in response to limited P conditions. |
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| issn | 1999-4907 |
| language | English |
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| spelling | doaj.art-97f706930fbc4c5b9174750446571abc2023-11-24T04:42:53ZengMDPI AGForests1999-49072022-10-011311176910.3390/f13111769Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P TracerXianhua Zou0Qingqing Liu1Zhijun Huang2Sitong Chen3Pengfei Wu4Xiangqing Ma5Liping Cai6Jiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems and Watershed Ecohydrology, Nanchang Institute of Technology, Nanchang 330099, ChinaJiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems and Watershed Ecohydrology, Nanchang Institute of Technology, Nanchang 330099, ChinaJiangxi Provincial Key Laboratory for Restoration of Degraded Ecosystems and Watershed Ecohydrology, Nanchang Institute of Technology, Nanchang 330099, ChinaAnhui Transportation Research Institute, Hefei 230031, ChinaState Forestry Administration Engineering Research Center of Chinese Fir, Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaState Forestry Administration Engineering Research Center of Chinese Fir, Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaState Forestry Administration Engineering Research Center of Chinese Fir, Fujian Agriculture and Forestry University, Fuzhou 350002, ChinaPhosphorus (P) is among the most intractable constraints on plant fertility, particularly in acidic soils with high P fixation capacities. The effects of nutrient limitation and the adaptive strategies of plants in infertile soils are central topics in plant ecology. The development of tree cultivars with greater P use efficiency (PUE), defined as the ability of a tree to grow and be productive in soils with reduced P availability, would substantially improve forest development. The ability of plants to redistribute and transfer P across fractions determines their adaptability to P limitations. However, the mechanisms of P utilization and transport remain unknown in Chinese fir (<i>Cunninghamia lanceolata</i> (Lamb.) Hook.) from the perspective of P fraction distribution. In this study, we investigated the distribution and translocation patterns of exogenous P and different P fractions in the M1 Chinese fir, which was identified as exhibiting high P-deficient resistance ability and maintaining higher yield under low P stress relative to the average clones, using <sup>32</sup>P tracking, which can accurately trace the migration pathways of exogenous P after plant absorption. We found that exogenous P in the roots was higher than in the stems or leaves under low-P conditions in which the amount of the exogenous P absorbed by M1 was significantly reduced. Under low-P conditions, the plants optimized P allocation, which led to higher PUE than under high-P conditions, with the highest PUE in the leaves, followed by the stems and roots. The M1 clone maintained a high ratio of soluble P (i.e., inorganic P and ester P) in its leaves and stems, which improved P mobility and recycling under the conditions of limited P. In the roots, the P fractions shifted from soluble inorganic P and ester P to insoluble P (i.e., nucleic P), but the total P concentration was relatively stable, which may ensure root growth and exogenous P absorption under the conditions of limited P. Our results confirm that the M1 Chinese fir reduces P demand, optimizes the allocation of P among P fractions, and increases PUE to maintain aboveground productivity in response to limited P conditions.https://www.mdpi.com/1999-4907/13/11/1769Chinese firP fractionshigh- and low-P treatmentsisotopic tracking |
| spellingShingle | Xianhua Zou Qingqing Liu Zhijun Huang Sitong Chen Pengfei Wu Xiangqing Ma Liping Cai Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer Forests Chinese fir P fractions high- and low-P treatments isotopic tracking |
| title | Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer |
| title_full | Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer |
| title_fullStr | Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer |
| title_full_unstemmed | Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer |
| title_short | Allocation of Phosphorus Fractions in Chinese Fir in Response to Low Phosphorus Availability Using <sup>32</sup>P Tracer |
| title_sort | allocation of phosphorus fractions in chinese fir in response to low phosphorus availability using sup 32 sup p tracer |
| topic | Chinese fir P fractions high- and low-P treatments isotopic tracking |
| url | https://www.mdpi.com/1999-4907/13/11/1769 |
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