Impact of phosphorus on rhizosphere organic anions of wheat at different growth stages under field conditions
Impact of phosphorus on rhizosphere organic anions of wheat at different growth stages under field conditions
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DOI：
10.1093/aobpla/plx008
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发表时间：
2017-03
期刊：
影响因子：
2.9
通讯作者：
Yanliang Wang;T. Krogstad;N. Clarke;A. F. Øgaard;J. Clarke
中科院分区：
文献类型：
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作者：
Yanliang Wang;T. Krogstad;N. Clarke;A. F. Øgaard;J. Clarke
。磷(P)是作物生产力的主要限制因素之一，而根际有机阴离子在磷的吸收中起着重要作用。为了解长期不同施磷量对fi田间条件下有机阴离子分泌的影响，进行了fi田间长期定位取样试验。从小麦三叶期到fl结实期，对1966年以来施磷0(P0)或48(P48)kg·ha(Cid：2)1 a(Cid：2)1的小麦(Triticum Aestivum)根际有机阴离子进行每周提取和分析。研究表明，从fi-ELD图谱中提取和定量根际有机阴离子是可能的。在P48小区中，与fi-RST采样相比，在早期(抽穗前)，根系P浓度下降了约40%，然后略有上升，而P0小区的植株表现出相反的趋势。苹果酸是小麦生长发育过程中分泌的主要有机阴离子。出苗后29天和42天，根际柠檬酸和苹果酸分别与根系磷浓度呈负相关和正相关(P<；0.05)。在29DAE之前，根际有机阴离子浓度很低，到42DAE时，根际有机阴离子浓度增加了4~10倍；后期这些浓度下降，表明根系释放的有机阴离子可能受到发育阶段和根磷浓度的影响。本研究为研究fi区小麦根际有机阴离子与不同磷浓度之间的关系提供了有价值的信息。
. Phosphorus (P) is one of the main limiting factors for crop productivity while rhizosphere organic anions have been hypothesized to play an important role in P acquisition. Sampling in a long-term field experiment was carried out in order to understand the impact of long-term differences in P fertilization on secretion of organic anions under field conditions. Rhizosphere organic anions were extracted and analyzed every week from three leaves stage to completed flowering stage of wheat ( Triticum aestivum ) grown on plots that have received 0 (P0) or 48 (P48) kg P ha (cid:2) 1 year (cid:2) 1 since 1966. The study showed that it is possible to extract and quantify rhizosphere organic anions from field plots. In P48 plots, root P concentrations decreased around 40 % at the early stages (before heading), compared with the first sampling, and then increased slightly, while plants grown in P0 plots showed the opposite trend. Malate was the main organic anion secreted throughout all the wheat growth stages. Rhizosphere citrate and malate showed negative and positive correlations ( P < 0.05) respectively with root P concentrations at 29 and 42 days after emergence (DAE). Rhizosphere organic anion concentrations were quite low until 29 DAE and then increased up to 4–10-fold until 42 DAE; these concentrations declined at later stages, indicating that root-released organic anions may have been affected by developmental stage and root P concentration. The present study provides valuable information about the relationship between rhizosphere organic anions and various P concentrations of wheat grown in the field.