Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Genomic Regions Associated with the Control of Flowering Time in Durum Wheat

Priyanka Gupta
ORCID logo ,
Hafssa Kabbaj
ORCID logo ,
Khaoula El Hassouni
,
Marco Maccaferri
,
Miguel Sabchez-Garcia
ORCID logo ,
Roberto Tuberosa
ORCID logo ,
Filippo Maria Bassi
* ORCID logo
Version 1 : Received: 2 October 2020 / Approved: 6 October 2020 / Online: 6 October 2020 (09:22:28 CEST)

A peer-reviewed article of this Preprint also exists.

Gupta, P.; Kabbaj, H.; El Hassouni, K.; Maccaferri, M.; Sanchez-Garcia, M.; Tuberosa, R.; Bassi, F.M. Genomic Regions Associated with the Control of Flowering Time in Durum Wheat. Plants 2020, 9, 1628. Gupta, P.; Kabbaj, H.; El Hassouni, K.; Maccaferri, M.; Sanchez-Garcia, M.; Tuberosa, R.; Bassi, F.M. Genomic Regions Associated with the Control of Flowering Time in Durum Wheat. Plants 2020, 9, 1628.

Abstract

Flowering time is a critical stage for crop development as it regulates the ability of plants to adapt to an environment. To understand the genetic control of flowering time, a genome wide association study (GWAS) was conducted to identify the genomic regions associated with the control of this trait in durum wheat (Triticum durum Desf.). A total of 96 landraces and 288 modern lines were evaluated for days to heading, growing degree days, and accumulated day length at flowering across 13 environments spread across Morocco, Lebanon, Mauritania, and Senegal. These environments were grouped into four pheno-environments based on temperatures, day length and other climatic variables. Genotyping with 35K Axiom array generated 7,652 polymorphic SNPs in addition to 3 KASP markers associated to known flowering genes. In total, 34 significant QTLs were identified in both landraces and modern lines. Some QTLs had strong association with already known regulatory photoperiod genes, Ppd-A and Ppd-B and vernalization genes Vrn-A1, and Vrn3. However, these loci explained only 5 to 20% of variance for days to heading. Seven QTLs overlapped between the two germplasm groups in which Q.ICD.Eps-03 and Q.ICD.Vrn-17 consistently affected flowering time in all the pheno-environments, while Q.ICD.Eps-11 and Q.ICD.Ppd-12 were significant only in two pheno-environments and the combined analysis across all environments. These results help clarify the genetic mechanism controlling flowering time in durum wheat and show some clear distinctions to what is known for common wheat (Triticum aestivum L.)

Keywords

durum wheat; flowering time; Pheno-environments; GWAS; QTL

Subject

Biology and Life Sciences, Anatomy and Physiology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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