1
|
Ichino L, Picard CL, Yun J, Chotai M, Wang S, Lin EK, Papareddy RK, Xue Y, Jacobsen SE. Single-nucleus RNA-seq reveals that MBD5, MBD6, and SILENZIO maintain silencing in the vegetative cell of developing pollen. Cell Rep 2022; 41:111699. [DOI: 10.1016/j.celrep.2022.111699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 09/28/2022] [Accepted: 10/28/2022] [Indexed: 11/23/2022] Open
|
2
|
Mattioli R, Palombi N, Funck D, Trovato M. Proline Accumulation in Pollen Grains as Potential Target for Improved Yield Stability Under Salt Stress. FRONTIERS IN PLANT SCIENCE 2020; 11:582877. [PMID: 33193531 PMCID: PMC7655902 DOI: 10.3389/fpls.2020.582877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/12/2020] [Indexed: 06/04/2023]
Abstract
Seed yield, a major determinant for the commercial success of grain crops, critically depends on pollen viability, which is dramatically reduced by environmental stresses, such as drought, salinity, and extreme temperatures. Salinity, in particular, is a major problem for crop yield known to affect about 20% of all arable land and cause huge economic losses worldwide. Flowering plants are particularly sensitive to environmental stress during sexual reproduction, and even a short exposure to stressing conditions can severely hamper reproductive success, and thus reduce crop yield. Since proline is required for pollen fertility and accumulates in plant tissues in response to different abiotic stresses, a role of proline in pollen protection under salt stress conditions can be envisaged. In this perspective, we analyze old and new data to evaluate the importance of pollen development under saline conditions, and discuss the possibility of raising proline levels in pollen grains as a biotechnological strategy to stabilize seed yield in the presence of salt stress. The overall data confirm that proline is necessary to preserve pollen fertility and limit seed loss under stressful conditions. However, at present, we have not enough data to conclude whether or not raising proline over wildtype levels in pollen grains can effectively ameliorate seed yield under saline conditions, and further work is still required.
Collapse
Affiliation(s)
- Roberto Mattioli
- Department of Biology and Biotechnology, Sapienza University of Rome, Rome, Italy
- Department of Science, Roma Tre University, Rome, Italy
| | - Noemi Palombi
- Department of Biology and Biotechnology, Sapienza University of Rome, Rome, Italy
| | - Dietmar Funck
- Department of Plant Physiology and Biochemistry, University of Konstanz, Konstanz, Germany
| | - Maurizio Trovato
- Department of Biology and Biotechnology, Sapienza University of Rome, Rome, Italy
| |
Collapse
|
3
|
Jaskolowski A, Iñigo S, Arellano SM, Arias LA, Fiol DF, Sede AR, Oldra MB, Lorenzi H, Muschietti JP, Pagnussat GC, Cerdán PD. The MED30 subunit of mediator complex is essential for early plant development and promotes flowering in Arabidopsis thaliana. Development 2019; 146:146/10/dev175224. [PMID: 31097434 DOI: 10.1242/dev.175224] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 04/15/2019] [Indexed: 02/05/2023]
Abstract
Mediator is a large multiprotein complex that is required for the transcription of most, if not all, genes transcribed by RNA Polymerase II. A core set of subunits is essential to assemble a functional Mediator in vitro and, therefore, the corresponding loss-of-function mutants are expected to be lethal. The MED30 subunit is essential in animal systems, but is absent in yeast. Here, we report that MED30 is also essential for both male gametophyte and embryo development in the model plant Arabidopsis thaliana Mutant med30 pollen grains were viable and some were able to germinate and target the ovules, although the embryos aborted shortly after fertilization, suggesting that MED30 is important for the paternal control of early embryo development. When gametophyte defects were bypassed by specific pollen complementation, loss of MED30 led to early embryo development arrest. Later in plant development, MED30 promotes flowering through multiple signaling pathways; its downregulation led to a phase change delay, downregulation of SQUAMOSA PROMOTER BINDING PROTEIN-LIKE 3 (SPL3), FLOWERING LOCUS T (FTI) and SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1), and upregulation of FLOWERING LOCUS C (FLC).
Collapse
Affiliation(s)
- Aime Jaskolowski
- Fundación Instituto Leloir, IIBBA-CONICET, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina
| | - Sabrina Iñigo
- Fundación Instituto Leloir, IIBBA-CONICET, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina
| | - Sofía M Arellano
- Fundación Instituto Leloir, IIBBA-CONICET, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina
| | - Leonardo A Arias
- Instituto de Investigaciones Biológicas, IIB-CONICET- Universidad Nacional de Mar del Plata, Funes 3250 cuarto nivel, 7600, Mar del Plata, Argentina
| | - Diego F Fiol
- Instituto de Investigaciones Biológicas, IIB-CONICET- Universidad Nacional de Mar del Plata, Funes 3250 cuarto nivel, 7600, Mar del Plata, Argentina
| | - Ana R Sede
- Instituto de Ingeniería Genética y Biología Molecular 'Dr. Hector N. Torres', INGEBI-CONICET, Buenos Aires 1428, Argentina
| | - María B Oldra
- Fundación Instituto Leloir, IIBBA-CONICET, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina
| | | | - Jorge P Muschietti
- Instituto de Ingeniería Genética y Biología Molecular 'Dr. Hector N. Torres', INGEBI-CONICET, Buenos Aires 1428, Argentina.,Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, Argentina
| | - Gabriela C Pagnussat
- Instituto de Investigaciones Biológicas, IIB-CONICET- Universidad Nacional de Mar del Plata, Funes 3250 cuarto nivel, 7600, Mar del Plata, Argentina
| | - Pablo D Cerdán
- Fundación Instituto Leloir, IIBBA-CONICET, Avenida Patricias Argentinas 435, 1405-Buenos Aires, Argentina .,Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, Argentina
| |
Collapse
|
4
|
Mattioli R, Biancucci M, El Shall A, Mosca L, Costantino P, Funck D, Trovato M. Proline synthesis in developing microspores is required for pollen development and fertility. BMC PLANT BIOLOGY 2018; 18:356. [PMID: 30558541 PMCID: PMC6296085 DOI: 10.1186/s12870-018-1571-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 11/23/2018] [Indexed: 05/25/2023]
Abstract
BACKGROUND In many plants, the amino acid proline is strongly accumulated in pollen and disruption of proline synthesis caused abortion of microspore development in Arabidopsis. So far, it was unclear whether local biosynthesis or transport of proline determines the success of fertile pollen development. RESULTS We analyzed the expression pattern of the proline biosynthetic genes PYRROLINE-5-CARBOXYLATE SYNTHETASE 1 & 2 (P5CS1 & 2) in Arabidopsis anthers and both isoforms were strongly expressed in developing microspores and pollen grains but only inconsistently in surrounding sporophytic tissues. We introduced in a p5cs1/p5cs1 p5cs2/P5CS2 mutant background an additional copy of P5CS2 under the control of the Cauliflower Mosaic Virus (CaMV) 35S promoter, the tapetum-specific LIPID TRANSFER PROTEIN 12 (Ltp12) promoter or the pollen-specific At5g17340 promoter to determine in which site proline biosynthesis can restore the fertility of proline-deficient microspores. The specificity of these promoters was confirmed by β-glucuronidase (GUS) analysis, and by direct proline measurement in pollen grains and stage-9/10 anthers. Expression of P5CS2 under control of the At5g17340 promoter fully rescued proline content and normal morphology and fertility of mutant pollen. In contrast, expression of P5CS2 driven by either the Ltp12 or CaMV35S promoter caused only partial restoration of pollen development with little effect on pollen fertility. CONCLUSIONS Overall, our results indicate that proline transport is not able to fulfill the demand of the cells of the male germ line. Pollen development and fertility depend on local proline biosynthesis during late stages of microspore development and in mature pollen grains.
Collapse
Affiliation(s)
- Roberto Mattioli
- Department of Biology and Biotechnology, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Marco Biancucci
- Department of Biology and Biotechnology, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
- Department of Bioscience, University of Milan, Milan, Italy
| | - Amira El Shall
- Department of Biology and Biotechnology, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Luciana Mosca
- Department of Biochemical Sciences, Sapienza University of Rome, Rome, Italy
| | - Paolo Costantino
- Department of Biology and Biotechnology, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| | - Dietmar Funck
- Department of Biology, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany
| | - Maurizio Trovato
- Department of Biology and Biotechnology, Sapienza University of Rome, P.le A. Moro 5, 00185 Rome, Italy
| |
Collapse
|
5
|
Oo MM, Bae HK, Nguyen TD, Moon S, Oh SA, Kim JH, Soh MS, Song JT, Jung KH, Park SK. Evaluation of rice promoters conferring pollen-specific expression in a heterologous system, Arabidopsis. PLANT REPRODUCTION 2014; 27:47-58. [PMID: 24550073 DOI: 10.1007/s00497-014-0239-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 02/10/2014] [Indexed: 06/03/2023]
Abstract
Promoters can direct gene expression specifically to targeted tissues or cells. Effective with both crop species and model plant systems, these tools can help researchers overcome the practical obstacles associated with transgenic protocols. Here, we identified promoters that allow one to target the manipulation of gene expression during pollen development. Utilizing published transcriptomic databases for rice, we investigated the promoter activity of selected genes in Arabidopsis. From various microarray datasets, including those for anthers and pollen grains at different developmental stages, we selected nine candidate genes that showed high levels of expression in the late stages of rice pollen development. We named these Oryza sativa late pollen-specific genes. Their promoter regions contained various cis-acting elements that could be responsible for anther-/pollen-specific expression. Promoter::GUS-GFP reporters were constructed and introduced into Arabidopsis plants. Histochemical GUS staining revealed that six of the nine rice promoters conferred strong GUS expression that was restricted to the anthers in Arabidopsis. Further analysis showed that although the GUS signals were not detected at the unicellular stage, they strengthened in the bicellular or tricellular stages, peaking at the mature pollen stage. This paralleled their transcriptomic profiles in rice. Based on our results, we proposed that these six rice promoters, which are active in the late stages of pollen formation in the dicot Arabidopsis, can aid molecular breeders in generating new varieties of a monocot plant, rice.
Collapse
Affiliation(s)
- Moe Moe Oo
- School of Applied Biosciences, Kyungpook National University, Daegu, 702-701, Republic of Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|