Apple russeting as seen through the RNA-seq lens: strong alterations in the exocarp cell wall

Plant Molecular Biology
Sylvain LegayJean-Francois Hausman

Abstract

Russeting, a commercially important defect in the exocarp of apple (Malus × domestica), is mainly characterized by the accumulation of suberin on the inner part of the cell wall of the outer epidermal cell layers. However, knowledge on the underlying genetic components triggering this trait remains sketchy. Bulk transcriptomic profiling was performed on the exocarps of three russeted and three waxy apple varieties. This experimental design was chosen to lower the impact of genotype on the obtained results. Validation by qPCR was carried out on representative genes and additional varieties. Gene ontology enrichment revealed a repression of lignin and cuticle biosynthesis genes in russeted exocarps, concomitantly with an enhanced expression of suberin deposition, stress responsive, primary sensing, NAC and MYB-family transcription factors, and specific triterpene biosynthetic genes. Notably, a strong correlation (R(2) = 0.976) between the expression of a MYB93-like transcription factor and key suberin biosynthetic genes was found. Our results suggest that russeting is induced by a decreased expression of cuticle biosynthetic genes, leading to a stress response which not only affects suberin deposition, but also the entire structu...Continue Reading

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Citations

May 6, 2016·Frontiers in Plant Science·Gea GuerrieroSylvain Legay
Jul 14, 2016·Genomics Data·Máximo GonzálezErika Salazar
Oct 8, 2016·The New Phytologist·Sylvain LegayJean-Francois Hausman
Oct 17, 2017·Journal of Experimental Botany·Johann PetitChristophe Rothan
Aug 20, 2020·Plant Molecular Biology·Raquel FigueiredoPaulo Mazzafera
May 22, 2019·Frontiers in Plant Science·Priyanka TrivediKatja Karppinen
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