Journal of Food, Agriculture and Environment

Genetic variation of nitrogen-use efficiency in Aegilops tauschii and amphidiploids

Author(s):

Xiaocun Zhang, Fanmei Kong, Fengbo Xue, Jinglan Zhao, Anfei Li, Lingrang Kong

Recieved Date: 2013-06-12, Accepted Date: 2013-10-20

Abstract:

The wild grass Aegilops tauschii, the D-genome ancestor of bread wheat, provides novel variation for many useful traits in wheat breeding. Ae. tauschii is easily hybridized with tetraploid wheat Langdon to generate amphidiploids, incorporating the superior attributes of Ae. tauschii. However, little is known about the genetic potential of Ae. tauschii with regard to the tolerance/adaptation to abiotic stresses, especially low soil nitrogen (N). Furthermore, the effect on the N-use efficiency trait when the DD genome (Ae. tauschii) is introduced into the AABB genome (Langdon) remains to be determined. Here, we report the genetic variation of nitrogen-use efficiency (NUE) in forty Ae. tauschii accessions originating from different geographical areas, common wheat cultivar Yumai 47 and ten amphidiploids as well as their parents (i.e., ten Ae. tauschii accessions and Langdon) using hydroponic and pot experiments. A significant variation in the biomass accumulation-related traits, N accumulation-related traits and NUE under the low and high Nitrogen treatment was observed among the Ae. tauschii accessions at both the seedling and adult stages. Interestingly, we found that the amphidiploids derived from Ae. tauschii and Langdon had the potential ability to produce higher grain yields than either Langdon or wheat cultivar at the adult stage. Moreover, the grain yields of the amphidiploids was much larger than those of Langdon and Yumai 47 under the low nitrogen treatment at the adult stage. The more increased grain yield of the amphidiploids than Langdon might be attributable to the contribution of D genome, conferring adaption to severe environments, especially low-nitrogen environments. However, the grain N utilization efficiency (GNUtE) of the amphidiploids was always lower than that of their tetraploid parent Langdon and Yumai 47, regardless of the stage (seedling or adult) or treatment (low or high N), implying that the amphidiploids, as the newly generated species, will require further refinement of the gene expression related to N utilization.

Keywords:

Aegilops tauschii, amphidiploid, N-utilization efficiency, wheat improvement

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Agriculture
Pages: 1291-1300

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