1
|
Ferreira Ribas A, Volpi e Silva N, dos Santos TB, Lima Abrantes F, Castilho Custódio C, Barbosa Machado-Neto N, Esteves Vieira LG. Regulation of α-expansins genes in Arabidopsis thaliana seeds during post-osmopriming germination. Physiol Mol Biol Plants 2019; 25:511-522. [PMID: 30956432 PMCID: PMC6419704 DOI: 10.1007/s12298-018-0620-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/17/2018] [Accepted: 10/30/2018] [Indexed: 05/14/2023]
Abstract
Seed osmopriming is a pre-sowing treatment that involves limitation of the seed water imbibition, so that pre-germinative metabolic activities proceed without radicular protrusion. This technique is used for improving germination rate, uniformity of seedling growth and hastening the time to start germination. In Arabidopsis thaliana, seed germination has been associated with the induction of enzymes involved in cell wall modifications, such as expansins. The α-expansins (EXPAs) are involved in cell wall relaxation and extension during seed germination. We used online tools to identify AtEXPA genes with preferential expression during seed germination and RT-qPCR to study the expression of five EXPA genes at different germination stages of non-primed and osmoprimed seeds. In silico promoter analysis of these genes showed that motifs similar to cis-acting elements related to abiotic stress, light and phytohormone responses are the most overrepresented in promoters of these AtEXPA genes, showing that their expression is likely be regulated by intrinsic developmental and environmental signals during Arabidopsis seed germination. The osmopriming conditioning had a decreased time and mean to 50% germination without affecting the percentage of final seed germination. The dried PEG-treated seeds showed noticeable high mRNA levels earlier at the beginning of water imbibition (18 h), showing that transcripts of all five EXPA isoforms were significantly produced during the osmopriming process. The strong up-regulation of these AtEXPA genes, mainly AtEXPA2, were associated with the earlier germination of the osmoprimed seeds, which qualifies them to monitor osmopriming procedures and the advancement of germination.
Collapse
Affiliation(s)
- Alessandra Ferreira Ribas
- Agronomy Graduate Program, Molecular Genetic Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| | - Nathalia Volpi e Silva
- Department of Plant Biology, Institute of Biology, University of Campinas (UNICAMP), Cidade Universitária Zeferina Vaz, Campinas, SP 13083-970 Brazil
| | - Tiago Benedito dos Santos
- Agronomy Graduate Program, Molecular Genetic Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| | - Fabiana Lima Abrantes
- Agronomy Graduate Program, Seed Reserach Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| | - Ceci Castilho Custódio
- Agronomy Graduate Program, Seed Reserach Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| | - Nelson Barbosa Machado-Neto
- Agronomy Graduate Program, Seed Reserach Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| | - Luiz Gonzaga Esteves Vieira
- Agronomy Graduate Program, Molecular Genetic Laboratory, Universidade do Oeste Paulista (UNOESTE), Rod. Raposo Tavares, km 572, Limoeiro, Presidente Prudente, SP 19067-175 Brazil
| |
Collapse
|