植物营养与肥料学报2017，Vol.23Issue(2)：502-511,10.DOI:10.11674/zwyy.16112
低磷胁迫下马尾松无性系磷效率性状对氮沉降的响应
Responses of phosphorus efficiency to simulated nitrogen deposition under phosphorus deficiency in Pinus massoniana clones
摘要
Abstract
[Objectives] This paper focused on how nitrogen (N) deposition impacts growth of different clones ofPinus massoniana under phosphorus (P) deficient soils.The results could formulate the breeding strategy of P.massoniana under N deposition.[Methods] Taking five representative clones ofP.massoniana which were cultivated for one year from full-sib progenies as test materials,a pot experiment was conducted to investigate variations of growth,root morphology and N/P efficiency in response to simulated N deposition under both homogeneous low P stress (low P level in all soil layers) and heterogeneous low P stress (high P level in the topsoil and low P level in the bottom soil),respectively.[Results] 1) Large variations were detected in seedling height and dry matter accumulation among the P.massoniana clones under both the homogeneous and heterogeneous low P stress,moreover,significant clone and N interaction effect was detected in the homogeneous P deficiency.2) The adaptive mechanism to the N deposition was different under different types of low soil phosphorus.Under the homogeneous low-P condition,the adaptive responses of root length (RL),root surface area (RSA) and APase activity were present in clones with strong growth vigor by simulated N deposition such as "33-4" and "19-5",while it was not observed in clones with weak growth vigor.Meanwhile,the correlation between dry matter accumulation and APase activity was enhanced by the simulated N deposition.Under the heterogeneous low-P condition,RL and RSA were significantly improved by the simulated N deposition,while the special root length (SRL) was decreased,thus having the greater ability for nutrition absorption and having lower consumption.3) The P absorption efficiency (PAE) ofP.massoniana clones was significantly affected by the nitrogen deposition and showed a significant positive correlation with nitrogen absorption efficiency (NAE) under different N and P conditions (P ＜ 0.01).It indicated that the nitrogen deposition could increase the P mobilization and uptake ofP.massoniana clones under the P deficiency.In contrast,there was no significant effect on P use efficiency (PUE).4) The amplitudes of variations of dry matter accumulation,RL,RSA and APase were wider and the repeatability (R) of these traits exceeded 0.75 (P ＜ 0.05),respectively.[Conclusions] Our results revealed the possibility of selecting clones with optimal root morphology and active APase was increased for wood production ofP.massoniana under the low-P and high-N conditions.关键词
马尾松/无性系/低磷胁迫/氮沉降/磷效率Key words
Pinus massoniana/clone/phosphorus deficiency/nitrogen deposition/phosphorus efficiency引用本文复制引用
宋平,张一,张蕊,周志春,丰忠平..低磷胁迫下马尾松无性系磷效率性状对氮沉降的响应[J].植物营养与肥料学报,2017,23(2):502-511,10.基金项目
“十二五”国家科技支撑计划项目(2012BAD01B02) （2012BAD01B02）
国家自然科学基金项目(31370671) （31370671）
浙江省农业新品种选育重大科技专项竹木育种协作组项目(2012C12908-12)资助. （2012C12908-12）
