库大小对春小麦不同物候期15N和13C分配的影响

Nitrogen Pub Date : 2023-01-19 DOI:10.3390/nitrogen4010004
K. Götz, Osman Erekul
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摘要

本研究的科学目的是回答库限制是否也适用于优质小麦品种的问题。研究了优质小麦triiso (E)和优质小麦naaxos (A)穗部减少一半后,物候期营养部分和籽粒中15N和13C的含量变化情况。在EC 11, EC 30, EC 59处施用三次肥料,其中EC 30和EC 59处10%为15N,植物也被标记为13CO2。与对照(0.437 mg15N/g DM)相比,仅施用第三段15N,并结合减半穗处理,15N含量显著提高(+11%),达到0.486 mg15N/g DM。与纳克索斯(0.160 mg 13C/g DM)相比,在EC 59下用13CO2标记整株植株,Triso在完全成熟阶段(EC 89)籽粒的13C含量显著高于Naxos (0.223 mg 13C/g DM),达到40% (0.223 mg 13C/g DM)。这种优势被降低到34%,并且也被证明是峰值减半(0.226 mg 13C/g DM, 0.169 mg 13C/g DM)。对照和减穗处理15N的再利用率分别为68.2%和61.1%。这清楚地表明,通过穗型减半减少汇大小导致15N从营养组织到生殖组织的再动员减少7%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Sink Size on 15N and 13C Allocation during Different Phenological Phases of Spring Wheat Cultivars
The scientific objective of this study was to answer the question of whether sink limitation is also true for high quality wheat varieties. We examined the incorporation of 15N and 13C during phenological phases into vegetative parts and grains of Elite wheat Triso (E) and Quality wheat Naxos (A) when the spike is halved. Three splits of fertilizer were applied at EC 11, EC 30, EC 59, whereby 10% at EC 30 and EC 59 was 15N, and plants were also labelled with 13CO2. The application of only the third split as 15N, combined with spike-halving, resulted in a significantly higher 15N-content (+11%) of 0.486 mg 15N/g DM, compared to the control (0.437 mg15N/g DM). Labelling whole plants with 13CO2 at EC 59 resulted in a significantly higher 13C-content—40%—(0.223 mg 13C/g DM) of the grains of the control for Triso at the fully-ripe stage (EC 89), compared to Naxos (0.160 mg 13C/g DM). This superiority was reduced to 34%, and was also demonstrated by spike-halving (0.226 mg 13C/g DM, 0.169 mg 13C/g DM). Remobilization of 15N for control and spike-halving treatments were 68.2% and 61.1%, respectively. This clearly demonstrates that the reduction of the sink size by spike-halving leads to a 7% reduction in the remobilization of 15N from vegetative to reproductive tissues.
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