Identifying nitrogen-use efficient soft red winter wheat lines in high and low nitrogen environments
Identifying nitrogen-use efficient soft red winter wheat lines in high and low nitrogen environments
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DOI：
10.1016/j.fcr.2016.10.001
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发表时间：
2017-01-01
影响因子：
5.8
通讯作者：
Van Sanford, David A.
中科院分区：
文献类型：
--
作者：
Hitz, Katlyn;Clark, Anthony J.;Van Sanford, David A.
氮素利用效率（NUE）是小麦育种家的一个重要研究课题，因为它解决了在有限的土地资源和气候变暖的限制下养活迅速增长的人口的令人生畏的前景。在这项研究中，我们评估了2014年来自美国东部小麦地区的56个SRW育种系和品种的NUE和相关性状。在列克星敦和Princeton，KY以完全析因设计在两个氮水平（0和112 kg ha（-1））下生长56个条目的块。测定了归一化植被指数（NDVI）、生物量、收获指数、氮收获指数、氮吸收效率、氮利用效率、花后氮吸收、氮再动员效率和总氮利用效率。育种者通常在地块上施用高比例的氮肥，以最大限度地提高遗传产量潜力。我们的研究表明，如果不同时在低氮环境中筛选育种系，就不可能鉴定出高NUE基因型。高氮条件下，花后吸氮量与产量呈极显著正相关（r=0.79），但遗传力接近于零。NUE的遗传力较高（h（2）= 0.65）。在低氮和高氮环境下，5个育种系的NUE均排在前10位。NDVI被认为是遗传和高度相关的N环境中的产量（R-2 = 0.78）。全基因组关联研究表明，NUE和相关性状的QTL与NUE（染色体2B），吸收效率（染色体1B）和利用效率（染色体1A和3A）。与其他研究雅阁，这些QTL的作用很小，可能只在基因组选择中有用，而不是标记辅助选择。(C)2016爱思唯尔B. V.保留所有权利。
Nitrogen use efficiency (NUE) is of great interest to wheat (Triticum aestivum L) breeders because it addresses the daunting prospect of feeding the burgeoning population under the constraints of limited land resources and a warming climate. In this study, we evaluated a 56 entry panel of SRW breeding lines and cultivars from the eastern US wheat region in 2014 for NUE and related traits. The 56-entry block was grown at Lexington and Princeton, KY at two N rates (0 and 112 kg ha(-1)) in a complete factorial design. We measured normalized difference vegetative index (NDVI), biomass, harvest index, N harvest index, N uptake efficiency, N utilization efficiency, post-anthesis N uptake, N remobilization efficiency and overall NUE. Breeders usually apply high rates of N fertilizer to their plots in order to maximize genetic yield potential. Our study indicates that without screening breeding lines in low N environments concurrently, it will not be possible to identify high NUE genotypes. Post-anthesis N uptake, was highly correlated with yield (r=0.79) under high N, but heritability of this trait was close to zero. Heritability of NUE, on the other hand was moderately high (h(2) = 0.65). Five breeding lines ranked within the top 10 for NUE in both low and high N environments. NDVI was found to be both heritable and highly correlated with yield across N environments (R-2 = 0.78). Genome wide association studies of NUE and related traits revealed QTL associated with NUE (chromosome 2B), uptake efficiency (chromosome 1B) and utilization efficiency (chromosomes 1A and 3A). In accord with other studies, these QTL are of small effect and will likely only be useful in genomic selection as opposed to marker-assisted selection. (C) 2016 Elsevier B.V. All rights reserved.