Evaluation of Aegilops tauschii for Heading Date and Its Gene Location in a Re-synthesized Hexaploid Wheat  

作　　者：XIANG Zhi-guo ZHANG Lian-quan NING Shun-zong ZHENG You-Liang LIU Deng-cai 

机构地区：[1]Triticeae Research Institute, Sichuan Agricultural University, Dujiangyan 611830, P.R.China [2]Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education/Sichuan Agricultural University, Ya＇an 625014, P. R. China

出　　处：《Agricultural Sciences in China》2009年第1期1-7,共7页中国农业科学（英文版）

基　　金：supported by the New Century Excellent Talents in University (NCET-04-0908);Changjiang Scholars and Innovative Research Team in University (IRT0453) of Ministry of Education of China;National Natural Science Foundation of China(30700495);Key Technologies R&D Program of China(2006BAD13B02);Education Department,and Scienceand Technology Department of Sichuan Province(07ZZ025)

摘　　要：The successful worldwide cultivation of hexaploid wheat in a diverse range of environments is because of, in part, breeding and selection for appropriate heading date. To adjust and fine-tune the heading time of hexaploid wheat to particular geographical regions and specific environment within these, there is an urgent need to evaluate and use alternative alleles for heading time. Aegilops tauschii, the donor species of D-genome of hexaploid wheat, has a wide geographic distribution. The present study revealed a wide variation for heading time among 56 Ae. tauschii accessions. All the accessions with short heading dates belonged to the ssp. tauschii, whereas most of ssp. strangulata accessions showed very long heading date. The heading date was also related to distribution of this species. The monotelosomic and monosomic analysis of a synthetic hexaploid wheat showed that chromosome 2D derived from ssp. tauschii accession AS60 had a major effect on promoting heading time with a reduction of more than 5 days. It is postulated that this Ae. tauschii genotype possess the allele Ppd-D^t1 responsible for the insensitivity to photoperiod. This allele is probably different from Ppd-D1 existing in hexaploid wheat. The new allele Ppd-D^t1 derived from Ae. tauschii might be used as a source for hexaploid wheat breeding on photoperiod response.The successful worldwide cultivation of hexaploid wheat in a diverse range of environments is because of, in part, breeding and selection for appropriate heading date. To adjust and fine-tune the heading time of hexaploid wheat to particular geographical regions and specific environment within these, there is an urgent need to evaluate and use alternative alleles for heading time. Aegilops tauschii, the donor species of D-genome of hexaploid wheat, has a wide geographic distribution. The present study revealed a wide variation for heading time among 56 Ae. tauschii accessions. All the accessions with short heading dates belonged to the ssp. tauschii, whereas most of ssp. strangulata accessions showed very long heading date. The heading date was also related to distribution of this species. The monotelosomic and monosomic analysis of a synthetic hexaploid wheat showed that chromosome 2D derived from ssp. tauschii accession AS60 had a major effect on promoting heading time with a reduction of more than 5 days. It is postulated that this Ae. tauschii genotype possess the allele Ppd-D^t1 responsible for the insensitivity to photoperiod. This allele is probably different from Ppd-D1 existing in hexaploid wheat. The new allele Ppd-D^t1 derived from Ae. tauschii might be used as a source for hexaploid wheat breeding on photoperiod response.

关 键 词：genetic diversity monosomic analysis photoperiod response synthetic wheat wheat breeding 

分 类 号：S512.1[农业科学—作物学]