Variability and limits of nitrogen and phosphorus resorption during foliar senescence  

作　　者：Marc Estiarte Matteo Campioli Maria Mayol Josep Penuelas 

机构地区：[1]CSIC,Global Ecology Unit CREAF-CSIC-UAB,08193 Bellaterra,Catalonia,Spain [2]CREAF,08193 Cerdanyola del Vallès,Catalonia,Spain [3]Research Group of Plant and Vegetation Ecology,Department of Biology,University of Antwerp,2610 Wilrijk,Belgium

出　　处：《Plant Communications》2023年第2期41-55,共15页植物通讯（英文）

基　　金：supported by Spanish Government grants PID2020-112738GB-I00,PID2019-110521GB-I00,and TED2021-132627B-I00;Fundacion Ramon Areces grant CIVP20A6621,and Catalan Government grant SGR2017-1005.

摘　　要：Foliar nutrient resorption(NuR)plays a key role in ecosystem functioning and plant nutrient economy.Most of this recycling occurs during the senescence of leaves and is actively addressed by cells.Here,we discuss the importance of cell biochemistry,physiology,and subcellular anatomy to condition the outcome of NuR at the cellular level and to explain the existence of limits to NuR.Nutrients are transferred from the leaf in simple metabolites that can be loaded into the phloem.Proteolysis is the main mechanism for mobilization of N,whereas P mobilization requires the involvement of different catabolic pathways,making the dynamics of P in leaves more variable than those of N before,during,and after foliar senescence.The biochemistry and fate of organelles during senescence impose constraints that limit NuR.The efficiency of NuR decreases,especially in evergreen species,as soil fertility increases,which is attributed to the relative costs of nutrient acquisition from soil decreasing with increasing soil nutrient availability,while the energetic costs of NuR from senescing leaves remain constant.NuR is genetically determined,with substantial interspecific variability,and is environmentally regulated in space and time,with nutrient availability being a key driver of intraspecific variability in NuR.

关 键 词：foliar nutrient resorption SENESCENCE NITROGEN PHOSPHORUS efficiency nutrient availability 

分 类 号：Q94[生物学—植物学]