Sex-specific strategies of phosphorus (P) acquisition in Populus cathayana as affected by soil P availability and distribution
Sex-specific strategies of phosphorus (P) acquisition in Populus cathayana as affected by soil P availability and distribution
复制标题
受土壤磷有效性和分布影响的青杨磷（P）获取的性别特异性策略
DOI：
10.1111/nph.16170
复制
发表时间：
2020
期刊：
影响因子：
9.4
通讯作者：
Li Chunyang
中科院分区：
文献类型：
--
作者：
Xia Zhichao;He Yue;Yu Lei;Lv Rubing;Korpelainen Helena;Li Chunyang
土壤磷素的有效性及其分布影响着植物的生长和生产力，但对雌雄异株植物的生长动态和磷素吸收策略的影响尚不清楚。在高磷条件下，雌株的总根长、比根长、生物量和叶片磷浓度均高于雌株。缺磷条件下，雄性根系比雌性根系小，但土壤酸性磷酸酶分泌量大，定殖率和丛枝菌根菌丝生物量高，表明雄性具有更好的挖掘磷的能力，并与丛枝菌根真菌有较强的关联，以获得磷。雌根增殖在P丰富的补丁有关增加叶片P同化。局部施磷不能提高雄虫根系的生物量积累和形态可塑性，但能提高菌丝生物量，表明雄虫获取磷的性别特异性策略与根系形态、根系分泌物和菌根共生有关，并可能影响雄虫的资源利用模式和生态位分离。
Soil phosphorus (P) availability and its distribution influence plant growth and productivity, but how they affect the growth dynamics and sex‐specific P acquisition strategies of dioecious plant species is poorly understood.In this study, the impact of soil P availability and its distribution on dioeciousPopulus cathayanawas characterized.P. cathayanamales and females were grown under three levels of P supply, and with homogeneous or heterogeneous P distribution.Females had a greater total root length, specific root length (SRL), biomass and foliar P concentration under high P supply. Under P deficiency, males had a smaller root system than females but a greater exudation of soil acid phosphatase, and a higher colonization rate and arbuscular mycorrhizal hyphal biomass, suggesting a better capacity to mine P and a stronger association with arbuscular mycorrhizal fungi to forage P. Heterogeneous P distribution enhanced growth and root length density (RLD) in females. Female root proliferation in P‐rich patches was related to increased foliar P assimilation. Localized P application for increasing P availability did not enhance the biomass accumulation and the morphological plasticity of roots in males, but it raised hyphal biomass.The findings herein indicate that sex‐specific strategies in P acquisition relate to root morphology, root exudation and mycorrhizal symbioses, and they may contribute to sex‐specific resource utilization patterns and niche segregation.