Paternally imprinted LATE-FLOWERING2 transcription factor contributes to paternal-excess interploidy hybridization barriers in wheat∞  

作　　者：Guanghui Yang Man Feng Kuohai Yu Guangxian Cui Yan Zhou Lv Sun Lulu Gao Yumei Zhang Huiru Peng Yingyin Yao Zhaorong Hu Vincenzo Rossi Ive De Smet Zhongfu Ni Qixin Sun Mingming Xin 

机构地区：[1]State Key Laboratory for Agrobiotechnology,Key Laboratory of Crop Heterosis Utilization(MOE),Beijing Key Laboratory of Crop Genetic Improvement,China Agricultural University,Beijing 100193,China [2]Qingdao Agricultural University,Qingdao 266109,China [3]Council for Agricultural Research and Economics,Research Centre for Cereal and Industrial Crops,Bergamo 24126,Italy [4]Department of Plant Biotechnology and Bioinformatics,Ghent University,Ghent B‐9052,Belgium [5]VIB Center for Plant Systems Biology,Ghent B‐9052,Belgium

出　　处：《Journal of Integrative Plant Biology》2023年第12期2587-2603,共17页植物学报（英文版）

基　　金：This work was supported by the National Natural Science of China(31471479);the Chinese Universities Scientific Fund(2017TC035).

摘　　要：Interploidy hybridization between hexaploid and tetraploid genotypes occurred repeatedly during genomic introgression events throughout wheat evolution,and is commonly employed in wheat breeding programs.Hexaploid wheat usually serves as maternal parent because the reciprocal cross generates progeny with severe defects and poor seed germination,but the underlying mechanism is poorly understood.Here,we performed detailed analysis of phenotypic variation in endosperm between two interploidy reciprocal crosses arising from tetraploid(Triticum durum,AABB)and hexaploid wheat(Triticum aestivum,AABBDD).In the paternal‐versus the maternal‐excess cross,the timing of endosperm cellularization was delayed and starch granule accumulation in the endosperm was repressed,causing reduced germination percentage.The expression profiles of genes involved in nutrient metabolism differed strongly between these endosperm types.Furthermore,expression patterns of parental alleles were dramatically disturbed in interploidy versus intraploidy crosses,leading to increased number of imprinted genes.The endosperm‐specific TaLFL2 showed a paternally imprinted expression pattern in interploidy crosses partially due to allele‐specific DNA methylation.Paternal TaLFL2 binds to and represses a nutrient accumulation regulator TaNAC019,leading to reduced storage protein and starch accumulation during endosperm development in paternal‐excess cross,as confirmed by interploidy crosses between tetraploid wild‐type and clustered regularly interspaced palindromic repeats(CRISPR)–CRISPR‐associated protein 9 generated hexaploid mutants.These findings reveal a contribution of genomic imprinting to paternal‐excess interploidy hybridization barriers during wheat evolution history and explains why experienced breeders preferentially exploit maternal‐excess interploidy crosses in wheat breeding programs.

关 键 词：IMPRINTING interploidy cross WHEAT 

分 类 号：S512.1[农业科学—作物学]