Sex-specific phosphorus(P)-use and-acquisition in dioecious Populus euphratica under different soil moisture levels  

不同土壤水分条件下雌雄胡杨性别特异的磷素利用和吸收策略

作　　者：Shengwei Si Yue He Zongpei Li Zhichao Xia 

机构地区：[1]Postdoctoral Research Station Geographical Sciences,Key Laboratory of Humid Subtropical Eco-geographical Process,Ministry of Education,School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China [2]Anhui Province Key Laboratory of Forest Resources and Silviculture,School of Forestry&Landscape Architecture,Anhui Agricultural University,Hefei 230036,China [3]Key Laboratory for Bio-resources and Eco-environment of the Ministry of Education,College of Life Sciences,Sichuan University,Chengdu 610065,China

出　　处：《Journal of Plant Ecology》2024年第6期34-48,共15页植物生态学报(英文版)

基　　金：supported by the Key Laboratory of Humid Subtropical Eco-geographical Process(Fujian Normal University),Ministry of Education and Start-up Foundation for Advanced Talents of Anhui Agricultural University(rc372210).

摘　　要：Dioecious plants show sexual dimorphism in their phosphorus(P)availability responses.However,the understanding of sex-specific strategies for P utilization and acquisition under varying soil moisture levels remains unclear.Here,we assessed a range of root functional traits,soil P properties,total foliar P concentration([P])and leaf chemical P fractions-inorganic P([Pi]),metabolite P([PM]),lipid P([PL]),nucleic acid P([PN])and residual P([PR])-as well as other leaf functional traits in female and male trees under different soil moisture levels(25%for high and 7%for low).Our results showed that females had larger specific root length under well-watered conditions,resulting in greater root foraging capacity.This led to a 36.3%decrease in soil active[Pi]in the rhizosphere and a 66.9%increase in total foliar[P],along with all five foliar chemical P fractions([Pi],[PM],[PL],[PN]and[PR])compared with males.However,males exhibited significantly higher photosynthetic P utilization efficiency than females.Especially under low soil moisture levels,males exhibited a significant reduction in soil active organic P,coupled with a large increase in the exudation of soil phosphatases and carboxylates.Furthermore,the proportion of[PM]in total foliar[P]was 42.0%higher in males than in females.Mantel and Spearman correlation analyses revealed distinct coordination and trade-offs between foliar P fraction allocation and below-ground P acquisition strategies between the two sexes.Leveraging these sex-specific strategies could enhance the resilience of dioecious populations in forest plantations facing climate-induced variability.雌雄异株植物对土壤磷有效性的响应表现出性别二态性。然而,关于不同土壤水分条件下雌雄异株植物性别特异的磷利用和吸收策略尚不清楚。因此,本研究测定了不同土壤水分条件下(高25%和低7%)雌雄胡杨(Populus euphratica)的根系功能性状、土壤磷组分、叶片总磷、叶片磷组分(无机磷、代谢磷、脂质磷、核酸磷和残余磷)以及其它叶片功能性状。结果表明,水分充足时,雌性的比根长更大,具有更强的根系觅食能力,导致雌性根际的土壤活性无机磷下降了36.3%,叶片总磷升高了66.9%,其他叶片磷组分也相应升高。然而,雄性的光合磷利用效率(PPUE)显著高于雌性,尤其在土壤水分不足时。相对于雌性,雄性土壤活性有机磷含量显著减少,土壤磷酸酶和羧酸盐含量显著增加,叶片代谢磷比例提高42.0%。Mantel和Spearman相关分析显示,胡杨叶片磷分配和地下磷获取策略之间存在性别特异的协调和权衡。在气候变化背景下,利用这些性别特异策略可以有效帮助雌雄异株植物种群的恢复。

关 键 词：DIOECY foliar P fractions P acquisition P relative allocation photosynthetic P use efficiency soil moisture 

分 类 号：S718.43[农业科学—林学]