title: Stage-dependent stoichiometric homeostasis and responses of nutrient resorption in Amaranthus mangostanus to nitrogen and phosphorus addition.
abstract: Stoichiometric homeostasis is the ability of plants remaining their element composition relatively stable regardless of changes in nutrient availability, via various physiological mechanisms. Nutrient resorption is one of such key mechanisms, but whether and how nitrogen and phosphorus homeostasis and resorption in plants would change with growth-stages under variable nutrient supply was unclear. A nitrogen (N) and phosphorus (P) fertilizer addition experiment was conducted to evaluate the dynamics of N and P homeostasis and resorption efficiency during different growth-stages of Amaranthus mangostanus in a greenhouse. The homeostasis regulation coefficient of green-leaf P varied significantly, while that of green-leaf N maintained relatively stable across growth stages. Moreover, homeostasis regulation coefficient of N was higher at seedling stage but lower at flowering stage than that of P at corresponding stages, suggesting that the growth of A. mangostanus may switch from being more N- to P-limited from vegetative to reproductive stage. N resorption efficiency (NRE) was higher and P resorption efficiency (PRE) was lower at flowering than seed-filling stage. The nutrient dynamics displayed here suggested contrasting nutrient homeostasis and resorption responses of plants to environmental nutrient availability across growth stages. These findings can improve the understanding of nutrition maintenance mechanism of plants during their growth.
authors.affiliation: Beijing Key Laboratory of Biodiversity and Organic Farming, Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.|Guizhou Institute of Biotechnology, Guiyang 550003, China.
authors.forename: Huiyuan
authors.initials: H
authors.lastname: Peng
authors.affiliation: Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
authors.forename: Yahan
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China.
authors.forename: Zhengbing
authors.initials: Z
authors.lastname: Yan
authors.affiliation: Beijing Key Laboratory of Biodiversity and Organic Farming, Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
authors.forename: Wenxuan
authors.initials: W
authors.lastname: Han
mesh_terms: D000465:Algorithms; D027721:Amaranthus / Q000254:growth & development / Q000378:metabolism*; D018533:Biomass; D017753:Ecosystem; D005308:Fertilizers; D035264:Flowers / Q000254:growth & development / Q000378:metabolism; D006706:Homeostasis; D009584:Nitrogen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D018515:Plant Leaves / Q000254:growth & development / Q000378:metabolism; D036226:Seedlings / Q000254:growth & development / Q000378:metabolism; D012987:Soil
chemical_list: D005308:Fertilizers; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen