四川农业大学首页 / 小麦所信箱 / 【中文/ English
新闻热点
当前位置:  网站首页 >>学术论著 >>近期论文 正文

The karyotype of Aegilops geniculata and its use to identify both addition and substitution lines of wheat

点击数:发布时间:2019-04-04 16:26:08 来源:

https://doi.org/10.1186/s13039-019-0428-2


Yingjin Yi†, Ke Zheng†, Shunzong Ning†, Laibin Zhao, Kai Xu, Ming Hao, Lianquan Zhang, Zhongwei Yuan and

Dengcai Liu


Abstract


Background: The annual allotetraploid species Aegilops geniculata harbors a number of traits relevant for wheat improvement. An effective cytogenetic method has yet to be developed to distinguish between each of its 14 chromosomes.


Results: A fluorescence in situ hybridization (FISH) approach was adopted to describe the karyotype of Ae. geniculata. Each of its 14 chromosomes was unequivocally recognized using a cocktail of three probes, namely pTa-713, (AAC)5 and pTa71. FISH karyotyping was then used to detect and characterize selections from an Ae. geniculata × bread wheat wide cross of a chromosome 1Mg disomic addition line and three 4Mg(4B) substitution lines. The identity of the addition line was confirmed by the presence of Glu-M1, detected both using an SDS-PAGE separation of endosperm proteins and by applying a PCR assay directed at the Glu-M1 locus. The status of the substitution lines was validated by genotyping using a wheat single nucleotide polymorphism chip.


Conclusion: FISH karyotyping based on pTa-713, (AAC)5 and pTa71 will be useful for determining the contribution of Ae. geniculata to derivatives of an Ae. geniculata × wheat wide cross. SNP chip-based genotyping is effective for confirming the status of whole chromosome wheat/alien substitution lines.


Keywords: Substitution line, Addition line, Fluorescence in situ hybridization, Single nucleotide polymorphism