Genome-Wide Association Mapping of Prostrate/Erect Growth Habit in Winter Durum Wheat

International Journal of Molecular Sciences

Matthias Rapp¹  Roberto Papa²  Domenico Rau³  Monica Rodriguez³  Daniela Marone⁴  Ivano Pecorella⁴  Giovanni Laidò⁴  Nicola Pecchioni⁴  Sergio Saia⁴  Julia Lafferty⁵  Pasquale De Vita⁶  FriedrichH. Longin⁶ 

[1] CoKG, Saatzuchtstrasse 11, A-2301 Probstdorf, Austria;Department of Agricultural, Food and Environmental Sciences, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy;Department of Agriculture, University of Sassari, Via E. de Nicola, 14, 07100 Sassari, Italy;Research Centre for Cereal and Industrial Crops, CREA, SS 673, km 25.200, 71122 Foggia, Italy;;Saatzucht Donau GesmbH &State Plant Breeding Institute, University of Hohenheim, Fruwirthstraße 21, 70593 Stuttgart, Germany;

关键词: durum wheat;    juvenile growth habit;    tiller angle;    qtl;    candidate gene;   

DOI  :  10.3390/ijms21020394

来源: DOAJ

【 摘 要 】

By selecting for prostrate growth habit of the juvenile phase of the cycle, durum wheat cultivars could be developed with improved competitive ability against weeds, and better soil coverage to reduce the soil water lost by evaporation. A panel of 184 durum wheat (Triticum turgidum subsp. durum) genotypes, previously genotyped with DArT-seq markers, was used to perform association mapping analysis of prostrate/erect growth habit trait and to identify candidate genes. Phenotypic data of plant growth habit were recorded during three consecutive growing seasons (2014−2016), two different growth conditions (field trial and greenhouse) and two sowing periods (autumn and spring). Genome-wide association study revealed significant marker-trait associations, twelve of which were specific for a single environment/year, 4 consistent in two environments, and two MTAs for the LSmeans were identified across all environments, on chromosomes 2B and 5A. The co-localization of some MTAs identified in this study with known vernalization and photoperiod genes demonstrated that the sensitivity to vernalization and photoperiod response are actually not only key components of spring/winter growth habit, but they play also an important role in defining the magnitude of the tiller angle during the tillering stage. Many zinc-finger transcription factors, such as C2H2 or CCCH-domain zinc finger proteins, known to be involved in plant growth habit and in leaf angle regulation were found as among the most likely candidate genes. The highest numbers of candidate genes putatively related to the trait were found on chromosomes 3A, 4B, 5A and 6A. Moreover, a bioinformatic approach has been considered to search for functional ortholog genes in wheat by using the sequence of rice and barley tiller angle-related genes. The information generated could be used to improve the understanding of the mechanisms that regulate the prostrate/erect growth habit in wheat and the adaptive potential of durum wheat under resource-limited environmental conditions.

【 授权许可】

Unknown