Hotspots in the genomic architecture of field drought responses in wheat as breeding targets

Sergio Gálvez, IWGSC The, Rosa Mérida-García, Carlos Camino, Philippa Borrill, Michael Abrouk, Ricardo H. Ramírez-González, Sezgi Biyiklioglu, Francisco Amil-Ruiz, Gabriel Dorado, Hikmet Budak, Victoria Gonzalez-Dugo, Pablo J. Zarco-Tejada, Rudi Appels, Cristobal Uauy, Pilar Hernandez

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Wheat can adapt to most agricultural conditions across temperate regions. This success is the result of phenotypic plasticity conferred by a large and complex genome composed of three homoeologous genomes (A, B, and D). Although drought is a major cause of yield and quality loss in wheat, the adaptive mechanisms and gene networks underlying drought responses in the field remain largely unknown. Here, we addressed this by utilizing an interdisciplinary approach involving field water status phenotyping, sampling, and gene expression analyses. Overall, changes at the transcriptional level were reflected in plant spectral traits amenable to field-level physiological measurements, although changes in photosynthesis-related pathways were found likely to be under more complex post-transcriptional control. Examining homoeologous genes with a 1:1:1 relationship across the A, B, and D genomes (triads), we revealed a complex genomic architecture for drought responses under field conditions, involving gene homoeolog specialization, multiple gene clusters, gene families, miRNAs, and transcription factors coordinating these responses. Our results provide a new focus for genomics-assisted breeding of drought-tolerant wheat cultivars.
Original languageEnglish (US)
Pages (from-to)295-309
Number of pages15
JournalFunctional & Integrative Genomics
Volume19
Issue number2
DOIs
StatePublished - Nov 16 2018

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