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Article

Genes Modulating the Increase in Sexuality in the Facultative Diplosporous Grass Eragrostis curvula under Water Stress Conditions

by
Juan Pablo Selva
1,†,
Diego Zappacosta
1,2,†,
José Carballo
1,2,†,
Juan Manuel Rodrigo
1,2,
Andrés Bellido
1,
Cristian Andrés Gallo
1,
Jimena Gallardo
1,2 and
Viviana Echenique
1,2,*
1
Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS—CCT—CONICET Bahía Blanca), Camino de la Carrindanga km 7, Bahía Blanca 8000, Argentina
2
Departamento de Agronomía, Universidad Nacional del Sur (UNS), San Andrés 800, Bahía Blanca 8000, Argentina
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Genes 2020, 11(9), 969; https://doi.org/10.3390/genes11090969
Submission received: 15 July 2020 / Revised: 14 August 2020 / Accepted: 17 August 2020 / Published: 21 August 2020
(This article belongs to the Special Issue Molecular Basis of Apomixis in Plants)
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Abstract

Eragrostis curvula presents mainly facultative genotypes that reproduce by diplosporous apomixis, retaining a percentage of sexual pistils that increase under drought and other stressful situations, indicating that some regulators activated by stress could be affecting the apomixis/sexual switch. Water stress experiments were performed in order to associate the increase in sexual embryo sacs with the differential expression of genes in a facultative apomictic cultivar using cytoembryology and RNA sequencing. The percentage of sexual embryo sacs increased from 4 to 24% and 501 out of the 201,011 transcripts were differentially expressed (DE) between control and stressed plants. DE transcripts were compared with previous transcriptomes where apomictic and sexual genotypes were contrasted. The results point as candidates to transcripts related to methylation, ubiquitination, hormone and signal transduction pathways, transcription regulation and cell wall biosynthesis, some acting as a general response to stress and some that are specific to the reproductive mode. We suggest that a DNA glycosylase EcROS1-like could be demethylating, thus de-repressing a gene or genes involved in the sexuality pathways. Many of the other DE transcripts could be part of a complex mechanism that regulates apomixis and sexuality in this grass, the ones in the intersection between control/stress and apo/sex being the strongest candidates.
Keywords: weeping lovegrass; apomixis; drought stress; RNA-seq; differentially expressed genes; sexuality weeping lovegrass; apomixis; drought stress; RNA-seq; differentially expressed genes; sexuality

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MDPI and ACS Style

Selva, J.P.; Zappacosta, D.; Carballo, J.; Rodrigo, J.M.; Bellido, A.; Gallo, C.A.; Gallardo, J.; Echenique, V. Genes Modulating the Increase in Sexuality in the Facultative Diplosporous Grass Eragrostis curvula under Water Stress Conditions. Genes 2020, 11, 969. https://doi.org/10.3390/genes11090969

AMA Style

Selva JP, Zappacosta D, Carballo J, Rodrigo JM, Bellido A, Gallo CA, Gallardo J, Echenique V. Genes Modulating the Increase in Sexuality in the Facultative Diplosporous Grass Eragrostis curvula under Water Stress Conditions. Genes. 2020; 11(9):969. https://doi.org/10.3390/genes11090969

Chicago/Turabian Style

Selva, Juan Pablo, Diego Zappacosta, José Carballo, Juan Manuel Rodrigo, Andrés Bellido, Cristian Andrés Gallo, Jimena Gallardo, and Viviana Echenique. 2020. "Genes Modulating the Increase in Sexuality in the Facultative Diplosporous Grass Eragrostis curvula under Water Stress Conditions" Genes 11, no. 9: 969. https://doi.org/10.3390/genes11090969

APA Style

Selva, J. P., Zappacosta, D., Carballo, J., Rodrigo, J. M., Bellido, A., Gallo, C. A., Gallardo, J., & Echenique, V. (2020). Genes Modulating the Increase in Sexuality in the Facultative Diplosporous Grass Eragrostis curvula under Water Stress Conditions. Genes, 11(9), 969. https://doi.org/10.3390/genes11090969

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