Transcriptomics and co-expression networks reveal tissue-specific responses and regulatory hubs under mild and severe drought in papaya (Carica papaya L.).

Abstract:

:Plants respond to drought stress through the ABA dependent and independent pathways, which in turn modulate transcriptional regulatory hubs. Here, we employed Illumina RNA-Seq to analyze a total of 18 cDNA libraries from leaves, sap, and roots of papaya plants under drought stress. Reference and de novo transcriptomic analyses identified 8,549 and 6,089 drought-responsive genes and unigenes, respectively. Core sets of 6 and 34 genes were simultaneously up- or down-regulated, respectively, in all stressed samples. Moreover, GO enrichment analysis revealed that under moderate drought stress, processes related to cell cycle and DNA repair were up-regulated in leaves and sap; while responses to abiotic stress, hormone signaling, sucrose metabolism, and suberin biosynthesis were up-regulated in roots. Under severe drought stress, biological processes related to abiotic stress, hormone signaling, and oxidation-reduction were up-regulated in all tissues. Moreover, similar biological processes were commonly down-regulated in all stressed samples. Furthermore, co-expression network analysis revealed three and eight transcriptionally regulated modules in leaves and roots, respectively. Seventeen stress-related TFs were identified, potentially serving as main regulatory hubs in leaves and roots. Our findings provide insight into the molecular responses of papaya plant to drought, which could contribute to the improvement of this important tropical crop.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Gamboa-Tuz SD,Pereira-Santana A,Zamora-Briseño JA,Castano E,Espadas-Gil F,Ayala-Sumuano JT,Keb-Llanes MÁ,Sanchez-Teyer F,Rodríguez-Zapata LC

doi

10.1038/s41598-018-32904-2

subject

Has Abstract

pub_date

2018-09-28 00:00:00

pages

14539

issue

1

issn

2045-2322

pii

10.1038/s41598-018-32904-2

journal_volume

8

pub_type

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