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Increased phosphate uptake but not resorption alleviates phosphorus deficiency induced by nitrogen deposition in temperate Larix principis-rupprechtii plantations.

Identifieur interne : 001118 ( Main/Exploration ); précédent : 001117; suivant : 001119

Increased phosphate uptake but not resorption alleviates phosphorus deficiency induced by nitrogen deposition in temperate Larix principis-rupprechtii plantations.

Auteurs : Meifeng Deng [République populaire de Chine] ; Lingli Liu [République populaire de Chine] ; Zhenzhong Sun [République populaire de Chine] ; Shilong Piao [République populaire de Chine] ; Yuecun Ma [République populaire de Chine] ; Yiwei Chen [République populaire de Chine] ; Jing Wang [République populaire de Chine] ; Chunlian Qiao [République populaire de Chine] ; Xin Wang [République populaire de Chine] ; Ping Li [République populaire de Chine]

Source :

RBID : pubmed:27400237

Descripteurs français

English descriptors

Abstract

The imbalance between nitrogen (N) and phosphorus (P) deposition may shift temperate ecosystems from N- to P-limitation. However, it is unclear how the imbalanced N : P input affects the strategies of plants to acquire P and, therefore, the growth of plants and the competition among species. We conducted a 4-yr N-addition experiment in young and mature larch (Larix principis-rupprechtii) stands. Plant growth and P acquisition strategies were assessed for larch and understorey vegetation. N addition stimulated the aboveground productivity of understorey vegetation in the young stand and larch in the mature stand, with other species unaffected. The competitive advantages of understorey vegetation in the young stand and larch in the mature stand were associated with their high stoichiometric homoeostasis. To maintain the N : P homoeostasis of these species, an increase in phosphatase activity but not P resorption efficiency increased the supply of P. Additionally, N addition accelerated P mineralization by decreasing the fungal-to-bacterial ratios and improved uptake of soil P by increasing the arbuscular mycorrhizas-to-ectomycorrhizas ratios. Our results suggest that plants with high stoichiometric homoeostasis could better cope with N deposition-induced P-deficiency. Although P resorption efficiency showed little plasticity in response, plants activated a variety of P-acquisition pathways to alleviate the P-deficiency caused by N deposition.

DOI: 10.1111/nph.14083
PubMed: 27400237


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Le document en format XML

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<country xml:lang="fr">République populaire de Chine</country>
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<term>Acid Phosphatase (metabolism)</term>
<term>Analysis of Variance (MeSH)</term>
<term>Bacteria (metabolism)</term>
<term>Biomass (MeSH)</term>
<term>Fatty Acids (metabolism)</term>
<term>Fungi (physiology)</term>
<term>Homeostasis (MeSH)</term>
<term>Larix (metabolism)</term>
<term>Mycorrhizae (physiology)</term>
<term>Nitrogen (metabolism)</term>
<term>Phosphates (metabolism)</term>
<term>Phospholipids (metabolism)</term>
<term>Phosphorus (deficiency)</term>
<term>Phosphorus (metabolism)</term>
<term>Plant Leaves (metabolism)</term>
<term>Plant Roots (metabolism)</term>
<term>Species Specificity (MeSH)</term>
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<term>Acid phosphatase (métabolisme)</term>
<term>Acides gras (métabolisme)</term>
<term>Analyse de variance (MeSH)</term>
<term>Azote (métabolisme)</term>
<term>Bactéries (métabolisme)</term>
<term>Biomasse (MeSH)</term>
<term>Champignons (physiologie)</term>
<term>Feuilles de plante (métabolisme)</term>
<term>Homéostasie (MeSH)</term>
<term>Larix (métabolisme)</term>
<term>Mycorhizes (physiologie)</term>
<term>Phosphates (métabolisme)</term>
<term>Phospholipides (métabolisme)</term>
<term>Phosphore (déficit)</term>
<term>Phosphore (métabolisme)</term>
<term>Racines de plante (métabolisme)</term>
<term>Spécificité d'espèce (MeSH)</term>
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<keywords scheme="MESH" type="chemical" qualifier="deficiency" xml:lang="en">
<term>Phosphorus</term>
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<term>Acid Phosphatase</term>
<term>Fatty Acids</term>
<term>Nitrogen</term>
<term>Phosphates</term>
<term>Phospholipids</term>
<term>Phosphorus</term>
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<term>Phosphore</term>
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<term>Acid phosphatase</term>
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<term>Phosphates</term>
<term>Phospholipides</term>
<term>Phosphore</term>
<term>Racines de plante</term>
</keywords>
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<term>Champignons</term>
<term>Mycorhizes</term>
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<term>Mycorrhizae</term>
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<term>Analysis of Variance</term>
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<term>Homeostasis</term>
<term>Species Specificity</term>
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<term>Analyse de variance</term>
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<div type="abstract" xml:lang="en">The imbalance between nitrogen (N) and phosphorus (P) deposition may shift temperate ecosystems from N- to P-limitation. However, it is unclear how the imbalanced N : P input affects the strategies of plants to acquire P and, therefore, the growth of plants and the competition among species. We conducted a 4-yr N-addition experiment in young and mature larch (Larix principis-rupprechtii) stands. Plant growth and P acquisition strategies were assessed for larch and understorey vegetation. N addition stimulated the aboveground productivity of understorey vegetation in the young stand and larch in the mature stand, with other species unaffected. The competitive advantages of understorey vegetation in the young stand and larch in the mature stand were associated with their high stoichiometric homoeostasis. To maintain the N : P homoeostasis of these species, an increase in phosphatase activity but not P resorption efficiency increased the supply of P. Additionally, N addition accelerated P mineralization by decreasing the fungal-to-bacterial ratios and improved uptake of soil P by increasing the arbuscular mycorrhizas-to-ectomycorrhizas ratios. Our results suggest that plants with high stoichiometric homoeostasis could better cope with N deposition-induced P-deficiency. Although P resorption efficiency showed little plasticity in response, plants activated a variety of P-acquisition pathways to alleviate the P-deficiency caused by N deposition.</div>
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<DateRevised>
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<Volume>212</Volume>
<Issue>4</Issue>
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<Year>2016</Year>
<Month>Dec</Month>
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<Title>The New phytologist</Title>
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<ArticleTitle>Increased phosphate uptake but not resorption alleviates phosphorus deficiency induced by nitrogen deposition in temperate Larix principis-rupprechtii plantations.</ArticleTitle>
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<AbstractText>The imbalance between nitrogen (N) and phosphorus (P) deposition may shift temperate ecosystems from N- to P-limitation. However, it is unclear how the imbalanced N : P input affects the strategies of plants to acquire P and, therefore, the growth of plants and the competition among species. We conducted a 4-yr N-addition experiment in young and mature larch (Larix principis-rupprechtii) stands. Plant growth and P acquisition strategies were assessed for larch and understorey vegetation. N addition stimulated the aboveground productivity of understorey vegetation in the young stand and larch in the mature stand, with other species unaffected. The competitive advantages of understorey vegetation in the young stand and larch in the mature stand were associated with their high stoichiometric homoeostasis. To maintain the N : P homoeostasis of these species, an increase in phosphatase activity but not P resorption efficiency increased the supply of P. Additionally, N addition accelerated P mineralization by decreasing the fungal-to-bacterial ratios and improved uptake of soil P by increasing the arbuscular mycorrhizas-to-ectomycorrhizas ratios. Our results suggest that plants with high stoichiometric homoeostasis could better cope with N deposition-induced P-deficiency. Although P resorption efficiency showed little plasticity in response, plants activated a variety of P-acquisition pathways to alleviate the P-deficiency caused by N deposition.</AbstractText>
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