Is the remobilization of S and N reserves for seed filling of winter oilseed rape modulated by sulphate restrictions occurring at different growth stages?
Is the remobilization of S and N reserves for seed filling of winter oilseed rape modulated by sulphate restrictions occurring at different growth stages?
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DOI：
10.1093/jxb/erq233
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发表时间：
2010-10
影响因子：
6.9
通讯作者：
Avice JC
中科院分区：
文献类型：
--
作者：
Dubousset L;Etienne P;Avice JC
S和氮素储备的再动员如何满足S施肥限制下油菜种子的需要，目前尚不清楚。因此，本研究旨在研究抽苔期[生育期(GS)32]、可见蕾期(GS 53)和结荚开始(GS 70)施硫限制[低S(LS)]对S和N的源库关系的影响，以及内源/外源S和N对种子产量和品质的影响。在GS 32、GS 53和GS 70应用的硫酸盐限制被注释为LS32、LS53和LS70。采用长期34SO42−和15NO3−标记技术，探讨了S在全株水平上的氮素分配规律。在LS53中，种子硫再动员效率(SRE)有所提高，但不足以维持种子品质。在LS32中，早期的S叶片再动员为S提供了根、茎和豆荚的生长，但随后对种子发育的需求没有得到充分满足，氮素利用效率(NUTE)比高的S(HS)低。在不影响产量构成因素的条件下，叶面有效动员S的SRE最高(65±1.2%)，最低残留S浓度为0.1-0.2%干物质。
How the remobilization of S and N reserves can meet the needs of seeds of oilseed rape subject to limitation of S fertilization remains largely unclear. Thus, this survey aims to determine the incidence of sulphate restriction [low S (LS)] applied at bolting [growth stage (GS) 32], visible bud (GS 53), and start of pod filling (GS 70) on source–sink relationships for S and N, and on the dynamics of endogenous/exogenous S and N contributing to seed yield and quality. Sulphate restrictions applied at GS 32, GS 53, and GS 70 were annotated LS32, LS53, and LS70. Long-term 34SO42− and 15NO3− labelling was used to explore S and N partitioning at the whole-plant level. In LS53, the sulphur remobilization efficiency (SRE) to seeds increased, but not enough to maintain seed quality. In LS32, an early S remobilization from leaves provided S for root, stem, and pod growth, but the subsequent demand for seed development was not met adequately and the N utilization efficiency (NUtE) was reduced when compared with high S (HS). The highest SRE (65±1.2% of the remobilized S) associated with an efficient foliar S mobilization (with minimal residual S concentrations of 0.1–0.2% dry matter) was observed under LS70 treatment, which did not affect yield components.
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影响因子：
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