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Rafińska K, Niedojadło K, Świdziński M, Bednarska-Kozakiewicz E. Distribution of exchangeable Ca 2+ during the process of Larix decidua Mill. pollination and germination. Sci Rep 2024; 14:5639. [PMID: 38454044 PMCID: PMC10920793 DOI: 10.1038/s41598-024-54903-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Accepted: 02/18/2024] [Indexed: 03/09/2024] Open
Abstract
The involvement of Ca2+ ions in angiosperms sexual processes is well established, while in gymnosperms, such knowledge remains limited and is still a topic of discussion. In this study, we focused on Larix decidua, using Alizarin-red S staining and the pyroantimonate method to examine the tissue and subcellular distribution of free and loosely bound Ca2+ ions at different stages of the male gametophyte's development and its interaction with the ovule. Our findings show that in larch, both the germination of pollen grains and the growth of pollen tubes occur in an environment rich in Ca2+. These ions play a crucial role in the adhesion of the pollen grain to the stigmatic tip and its subsequent movement to the micropylar canal. There is a significant presence of free and loosely bound Ca2+ ions in both the fluid of the micropylar canal and the extracellular matrix of the nucellus. As the pollen tube extends through the nucellus, we observed a notable accumulation of Ca2+ ions just above the entry to the mature archegonium, a region likely crucial for the male gametophyte's directional growth. Meanwhile, the localized presence of free and loosely bound Ca2+ ions within the egg cell cytoplasm may inhibit the pollen tubes growth and rupture, playing an important role in fertilization.
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Affiliation(s)
- Katarzyna Rafińska
- Department of Environmental Chemistry and Bioanalysis, Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, 87-100, Toruń, Poland
| | - Katarzyna Niedojadło
- Department of Cellular and Molecular Biology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Lwowska 1, 87-100, Toruń, Poland.
| | - Michał Świdziński
- Department of Cellular and Molecular Biology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Lwowska 1, 87-100, Toruń, Poland
| | - Elżbieta Bednarska-Kozakiewicz
- Department of Cellular and Molecular Biology, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, Lwowska 1, 87-100, Toruń, Poland
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2
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Chebli Y, Geitmann A. Pectate lyase-like lubricates the male gametophyte's path toward its mating partner. PLANT PHYSIOLOGY 2023; 194:124-136. [PMID: 37658849 DOI: 10.1093/plphys/kiad481] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 07/10/2023] [Accepted: 08/12/2023] [Indexed: 09/05/2023]
Abstract
The pollen tube is an extension of the male gametophyte in plants and mediates sexual reproduction by delivering the sperm cells to the female gametophyte. To accomplish this task, the elongating pollen tube must break through the thick wall of the pollen grain and penetrate multiple pistillar tissues. Both processes require the loosening of cell wall material-that of the pollen intine and that of the apoplast of the transmitting tract. The enzymatic toolbox for these cell wall modifying processes employed by the invading male gametophyte is elusive. We investigated the role of the pectin-digesting pectate lyase-like (PLL) by combining mutant analysis with microscopy observations, fluorescence recovery after photo-bleaching experiments, and immuno-detection. We show that in Arabidopsis (Arabidopsis thaliana), PLLs are required for intine loosening during the first steps of pollen tube germination. We provide evidence that during pollen tube elongation, PLLs are released by the pollen tube into the extracellular space, suggesting that they may be employed to soften the apoplast of the transmitting tissue. The synergistic enzymatic action of PLLs in the pollen grain, the pollen tube, and the transmitting track contribute to an effective fertilization process.
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Affiliation(s)
- Youssef Chebli
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Québec H9X 3V9, Canada
- ECP3-Multi-Scale Imaging Facility, McGill University, Ste-Anne-de-Bellevue, Québec H9X 3V9, Canada
| | - Anja Geitmann
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Québec H9X 3V9, Canada
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3
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Kawade K, Tabeta H, Ferjani A, Hirai MY. The Roles of Functional Amino Acids in Plant Growth and Development. PLANT & CELL PHYSIOLOGY 2023; 64:1482-1493. [PMID: 37489637 DOI: 10.1093/pcp/pcad071] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 06/04/2023] [Accepted: 07/03/2023] [Indexed: 07/26/2023]
Abstract
Plants incorporate acquired carbon and nitrogen into amino acid metabolism, whereby the building blocks of proteins and the precursors of various metabolites are produced. This fundamental demand requires tight amino acid metabolism to sustain physiological homeostasis. There is increasing evidence that amino acid metabolism undergoes plastic alteration to orchestrate specific growth and developmental events. Consequently, there has been a gradual exploration of the interface at which amino acid metabolism and plant morphogenesis are mutually affected. This research progress offers an opportunity to explore amino acid metabolism, with the goal to understand how it can be modulated to serve special cellular needs and regulate specific growth and developmental pathways. Continuous improvements in the sensitivity and coverage of metabolomics technology, along with the development of chemoinformatics, have allowed the investigation of these research questions. In this review, we summarize the roles of threonine, serine, arginine and γ-aminobutyric acid as representative examples of amino acids relevant to specific developmental processes in plants ('functional amino acids'). Our objective is to expand perspectives regarding amino acid metabolism beyond the conventional view that it is merely life-supporting machinery.
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Affiliation(s)
- Kensuke Kawade
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, Shimo-Okubo 255, Sakura-ku, Saitama, 338-8570 Japan
- Metabolic Systems Research Team, RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama, Kanagawa, 230-0045 Japan
| | | | - Ali Ferjani
- Department of Biology, Tokyo Gakugei University, 4-1-1 Nukuikita-machi, Koganei, Tokyo, 184-8501 Japan
- Metabolic Systems Research Team, RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama, Kanagawa, 230-0045 Japan
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902 Japan
| | - Masami Yokota Hirai
- Metabolic Systems Research Team, RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama, Kanagawa, 230-0045 Japan
- Department of Applied Biosciences, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
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4
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Robichaux KJ, Smith DK, Blea MN, Weigand C, Harper JF, Wallace IS. Disruption of pollen tube homogalacturonan synthesis relieves pollen tube penetration defects in the Arabidopsis O-FUCOSYLTRANSFERASE1 mutant. PLANT REPRODUCTION 2023:10.1007/s00497-023-00468-5. [PMID: 37222783 DOI: 10.1007/s00497-023-00468-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 05/05/2023] [Indexed: 05/25/2023]
Abstract
During angiosperm sexual reproduction, pollen tubes must penetrate through multiple cell types in the pistil to mediate successful fertilization. Although this process is highly choreographed and requires complex chemical and mechanical signaling to guide the pollen tube to its destination, aspects of our understanding of pollen tube penetration through the pistil are incomplete. Our previous work demonstrated that disruption of the Arabidopsis thaliana O-FUCOSYLTRANSFERASE1 (OFT1) gene resulted in decreased pollen tube penetration through the stigma-style interface. Here, we demonstrate that second site mutations of Arabidopsis GALACTURONOSYLTRANSFERASE 14 (GAUT14) effectively suppress the phenotype of oft1 mutants, partially restoring silique length, seed set, pollen transmission, and pollen tube penetration deficiencies in navigating the female reproductive tract. These results suggest that disruption of pectic homogalacturonan (HG) synthesis can alleviate the penetrative defects associated with the oft1 mutant and may implicate pectic HG deposition in the process of pollen tube penetration through the stigma-style interface in Arabidopsis. These results also support a model in which OFT1 function directly or indirectly modifies structural features associated with the cell wall, with the loss of oft1 leading to an imbalance in the wall composition that can be compensated for by a reduction in pectic HG deposition.
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Affiliation(s)
- Kayleigh J Robichaux
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA
| | - Devin K Smith
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA
| | - Madison N Blea
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA
| | - Chrystle Weigand
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA
| | - Jeffrey F Harper
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA
| | - Ian S Wallace
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, 1664 N. Virginia St. MS0330, Reno, NV, 89557, USA.
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5
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Wang L, Liang X, Dou S, Yi B, Fu T, Ma C, Dai C. Two aspartic proteases, BnaAP36s and BnaAP39s, regulate pollen tube guidance in Brassica napus. MOLECULAR BREEDING : NEW STRATEGIES IN PLANT IMPROVEMENT 2023; 43:27. [PMID: 37313529 PMCID: PMC10248713 DOI: 10.1007/s11032-023-01377-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 03/31/2023] [Indexed: 06/15/2023]
Abstract
Pollen tube (PT) growth towards the micropyle is critical for successful double fertilization. However, the mechanism of micropyle-directed PT growth is still unclear in Brassica napus. In this study, two aspartate proteases, BnaAP36s and BnaAP39s, were identified in B. napus. BnaAP36s and BnaAP39s were localized to the plasma membrane. The homologues of BnaAP36 and BnaAP39 were highly expressed in flower organs, especially in the anther. Sextuple and double mutants of BnaAP36s and BnaAP39s were then generated using CRISPR/Cas9 technology. Compared to WT, the seed-set of cr-bnaap36 and cr-bnaap39 mutants was reduced by 50% and 60%, respectively. The reduction in seed-set was also found when cr-bnaap36 and cr-bnaap39 were used as the female parent in a reciprocal cross assay. Like WT, cr-bnaap36 and cr-bnaap39 pollen were able to germinate and the relative PTs were able to elongate in style. Approximately 36% and 33% of cr-bnaap36 and cr-bnaap39 PTs, respectively, failed to grow towards the micropyle, indicating that BnaAP36s and BnaAP39s are essential for micropyle-directed PT growth. Furthermore, Alexander's staining showed that 10% of cr-bnaap39 pollen grains were aborted, but not cr-bnaap36, suggesting that BnaAP39s may also affect microspore development. These results suggest that BnaAP36s and BnaAP39s play a critical role in the growth of micropyle-directed PTs in B. napus. Supplementary Information The online version contains supplementary material available at 10.1007/s11032-023-01377-1.
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Affiliation(s)
- Lulin Wang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
- Hubei Hongshan Laboratory, Wuhan, 430070 China
| | - Xiaomei Liang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
- Hubei Hongshan Laboratory, Wuhan, 430070 China
| | - Shengwei Dou
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
- Hubei Hongshan Laboratory, Wuhan, 430070 China
| | - Bin Yi
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
| | - Tingdong Fu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
| | - Chaozhi Ma
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
- Hubei Hongshan Laboratory, Wuhan, 430070 China
| | - Cheng Dai
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070 China
- Hubei Hongshan Laboratory, Wuhan, 430070 China
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6
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Cheng Z, Song X, Liu X, Yan S, Song W, Wang Z, Han L, Zhao J, Yan L, Zhou Z, Zhang X. SPATULA and ALCATRAZ confer female sterility and fruit cavity via mediating pistil development in cucumber. PLANT PHYSIOLOGY 2022; 189:1553-1569. [PMID: 35389464 PMCID: PMC9237723 DOI: 10.1093/plphys/kiac158] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 03/12/2022] [Indexed: 06/03/2023]
Abstract
Fruits and seeds play essential roles in plant sexual reproduction and the human diet. Successful fertilization involves delivery of sperm in the pollen tube to the egg cell within the ovary along the transmitting tract (TT). Fruit cavity is an undesirable trait directly affecting cucumber (Cucumis sativus) commercial value. However, the regulatory genes underlying fruit cavity formation and female fertility determination remain unknown in crops. Here, we characterized a basic Helix-Loop-Helix (bHLH) gene C. sativus SPATULA (CsSPT) and its redundant and divergent function with ALCATRAZ (CsALC) in cucumber. CsSPT transcripts were enriched in reproductive organs. Mutation of CsSPT resulted in 60% reduction in female fertility, with seed produced only in the upper portion of fruits. Csspt Csalc mutants displayed complete loss of female fertility and fruit cavity due to carpel separation. Further examination showed that stigmas in the double mutant turned outward with defective papillae identity, and extracellular matrix contents in the abnormal TT were dramatically reduced, which resulted in no path for pollen tube extension and no ovules fertilized. Biochemical and transcriptome analysis showed that CsSPT and CsALC act in homodimers and heterodimers to confer fruit cavity and female sterility by mediating genes involved in TT development, auxin-mediated signaling, and cell wall organization in cucumber.
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Affiliation(s)
- Zhihua Cheng
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Xiaofei Song
- College of Horticulture Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao, China
| | - Xiaofeng Liu
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Shuangshuang Yan
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Weiyuan Song
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Zhongyi Wang
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Lijie Han
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
| | - Jianyu Zhao
- Department of Vegetable Sciences, State Key Laboratories of Agrobiotechnology, Joint International Research Laboratory of Crop Molecular Breeding, Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops, China Agricultural University, Beijing 100193, China
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7
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Macgregor SR, Lee HK, Nelles H, Johnson DC, Zhang T, Ma C, Goring DR. Autophagy is required for self-incompatible pollen rejection in two transgenic Arabidopsis thaliana accessions. PLANT PHYSIOLOGY 2022; 188:2073-2084. [PMID: 35078230 PMCID: PMC8969033 DOI: 10.1093/plphys/kiac026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 12/22/2021] [Indexed: 05/16/2023]
Abstract
Successful reproduction in the Brassicaceae is mediated by a complex series of interactions between the pollen and the pistil, and some species have an additional layer of regulation with the self-incompatibility trait. While the initial activation of the self-incompatibility pathway by the pollen S-locus protein 11/S locus cysteine-rich protein and the stigma S Receptor Kinase is well characterized, the downstream mechanisms causing self-pollen rejection are still not fully understood. In previous studies, we detected the presence of autophagic bodies with self-incompatible (SI) pollinations in Arabidopsis lyrata and transgenic Arabidopsis thaliana lines, but whether autophagy was essential for self-pollen rejection was unknown. Here, we investigated the requirement of autophagy in this response by crossing mutations in the essential AUTOPHAGY7 (ATG7) and ATG5 genes into two different transgenic SI A. thaliana lines in the Col-0 and C24 accessions. By using these previously characterized transgenic lines that express A. lyrata and Arabidopsis halleri self-incompatibility genes, we demonstrated that disrupting autophagy weakened their SI responses in the stigma. When the atg7 or atg5 mutations were present, an increased number of SI pollen was found to hydrate and form pollen tubes that successfully fertilized the SI pistils. Additionally, we confirmed the presence of GFP-ATG8a-labeled autophagosomes in the stigmatic papillae following SI pollinations. Together, these findings support the requirement of autophagy in the self-incompatibility response and add to the growing understanding of the intracellular mechanisms employed in the transgenic A. thaliana stigmas to reject self-pollen.
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Affiliation(s)
- Stuart R Macgregor
- Department of Cell & Systems Biology, University of Toronto, Toronto, Canada M5S 3B2
| | | | - Hayley Nelles
- Department of Cell & Systems Biology, University of Toronto, Toronto, Canada M5S 3B2
| | - Daniel C Johnson
- Department of Cell & Systems Biology, University of Toronto, Toronto, Canada M5S 3B2
| | - Tong Zhang
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
| | - Chaozhi Ma
- National Key Laboratory of Crop Genetic Improvement, National Center of Rapeseed Improvement in Wuhan, Huazhong Agricultural University, Wuhan 430070, China
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8
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Gutiérrez-Valencia J, Fracassetti M, Horvath R, Laenen B, Désamore A, Drouzas AD, Friberg M, Kolář F, Slotte T. Genomic Signatures of Sexual Selection on Pollen-Expressed Genes in Arabis alpina. Mol Biol Evol 2021; 39:6456311. [PMID: 34878144 PMCID: PMC8788238 DOI: 10.1093/molbev/msab349] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Fertilization in angiosperms involves the germination of pollen on the stigma, followed by the extrusion of a pollen tube that elongates through the style and delivers two sperm cells to the embryo sac. Sexual selection could occur throughout this process when male gametophytes compete for fertilization. The strength of sexual selection during pollen competition should be affected by the number of genotypes deposited on the stigma. As increased self-fertilization reduces the number of mating partners, and the genetic diversity and heterozygosity of populations, it should thereby reduce the intensity of sexual selection during pollen competition. Despite the prevalence of mating system shifts, few studies have directly compared the molecular signatures of sexual selection during pollen competition in populations with different mating systems. Here we analyzed whole-genome sequences from natural populations of Arabis alpina, a species showing mating system variation across its distribution, to test whether shifts from cross- to self-fertilization result in molecular signatures consistent with sexual selection on genes involved in pollen competition. We found evidence for efficient purifying selection on genes expressed in vegetative pollen, and overall weaker selection on sperm-expressed genes. This pattern was robust when controlling for gene expression level and specificity. In agreement with the expectation that sexual selection intensifies under cross-fertilization, we found that the efficacy of purifying selection on male gametophyte-expressed genes was significantly stronger in genetically more diverse and outbred populations. Our results show that intra-sexual competition shapes the evolution of pollen-expressed genes, and that its strength fades with increasing self-fertilization rates.
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Affiliation(s)
- Juanita Gutiérrez-Valencia
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Marco Fracassetti
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Robert Horvath
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Benjamin Laenen
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Aurélie Désamore
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Andreas D Drouzas
- Laboratory of Systematic Botany and Phytogeography, School of Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Magne Friberg
- Department of Biology, Lund University, Lund, Sweden
| | - Filip Kolář
- Department of Botany, Faculty of Science, Charles University, Prague, Czech Republic
| | - Tanja Slotte
- Department of Ecology, Environment, and Plant Sciences, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
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9
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Signaling at Physical Barriers during Pollen-Pistil Interactions. Int J Mol Sci 2021; 22:ijms222212230. [PMID: 34830110 PMCID: PMC8622735 DOI: 10.3390/ijms222212230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 11/05/2021] [Accepted: 11/08/2021] [Indexed: 01/17/2023] Open
Abstract
In angiosperms, double fertilization requires pollen tubes to transport non-motile sperm to distant egg cells housed in a specialized female structure known as the pistil, mediating the ultimate fusion between male and female gametes. During this journey, the pollen tube encounters numerous physical barriers that must be mechanically circumvented, including the penetration of the stigmatic papillae, style, transmitting tract, and synergid cells as well as the ultimate fusion of sperm cells to the egg or central cell. Additionally, the pollen tube must maintain structural integrity in these compact environments, while responding to positional guidance cues that lead the pollen tube to its destination. Here, we discuss the nature of these physical barriers as well as efforts to genetically and cellularly identify the factors that allow pollen tubes to successfully, specifically, and quickly circumnavigate them.
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10
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Lara-Mondragón CM, MacAlister CA. Arabinogalactan glycoprotein dynamics during the progamic phase in the tomato pistil. PLANT REPRODUCTION 2021; 34:131-148. [PMID: 33860833 DOI: 10.1007/s00497-021-00408-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 04/02/2021] [Indexed: 06/12/2023]
Abstract
Pistil AGPs display dynamic localization patterns in response to fertilization in tomato. SlyFLA9 (Solyc07g065540.1) is a chimeric Fasciclin-like AGP with enriched expression in the ovary, suggesting a potential function during pollen-pistil interaction. During fertilization, the male gametes are delivered by pollen tubes to receptive ovules, deeply embedded in the sporophytic tissues of the pistil. Arabinogalactan glycoproteins (AGPs) are a diverse family of highly glycosylated, secreted proteins which have been widely implicated in plant reproduction, particularly within the pistil. Though tomato (Solanum lycopersicum) is an important crop requiring successful fertilization for production, the molecular basis of this event remains understudied. Here we explore the spatiotemporal localization of AGPs in the mature tomato pistil before and after fertilization. Using histological techniques to detect AGP sugar moieties, we found that accumulation of AGPs correlated with the maturation of the stigma and we identified an AGP subpopulation restricted to the micropyle that was no longer visible upon fertilization. To identify candidate pistil AGP genes, we used an RNA-sequencing approach to catalog gene expression in functionally distinct subsections of the mature tomato pistil (the stigma, apical and basal style and ovary) as well as pollen and pollen tubes. Of 161 predicted AGP and AGP-like proteins encoded in the tomato genome, we identified four genes with specifically enriched expression in reproductive tissues. We further validated expression of two of these, a Fasciclin-like AGP (SlyFLA9, Solyc07g065540.1) and a novel hybrid AGP (SlyHAE, Solyc09g075580.1). Using in situ hybridization, we also found SlyFLA9 was expressed in the integuments of the ovule and the pericarp. Additionally, differential expression analyses of the pistil transcriptome revealed previously unreported genes with enriched expression in each subsection of the mature pistil, setting the foundation for future functional studies.
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Affiliation(s)
| | - Cora A MacAlister
- Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.
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11
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Tonnabel J, David P, Janicke T, Lehner A, Mollet JC, Pannell JR, Dufay M. The Scope for Postmating Sexual Selection in Plants. Trends Ecol Evol 2021; 36:556-567. [PMID: 33775429 DOI: 10.1016/j.tree.2021.02.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 11/27/2022]
Abstract
Sexual selection is known to shape plant traits that affect access to mates during the pollination phase, but it is less well understood to what extent it affects traits relevant to interactions between pollen and pistils after pollination. This is surprising, because both of the two key modes of sexual selection, male-male competition and female choice, could plausibly operate during pollen-pistil interactions where physical male-female contact occurs. Here, we consider how the key processes of sexual selection might affect traits involved in pollen-pistil interactions, including 'Fisherian runaway' and 'good-genes' models. We review aspects of the molecular and cellular biology of pollen-pistil interactions on which sexual selection could act and point to research that is needed to investigate them.
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Affiliation(s)
- Jeanne Tonnabel
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France.
| | - Patrice David
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France
| | - Tim Janicke
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France; Applied Zoology, Technical University Dresden, Zellescher Weg 20b, 01062 Dresden, Germany
| | - Arnaud Lehner
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (GlycoMEV), SFR 4377 NORVEGE, IRIB, Carnot I2C, 76000 Rouen, France
| | - Jean-Claude Mollet
- Normandie Univ, UNIROUEN, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale (GlycoMEV), SFR 4377 NORVEGE, IRIB, Carnot I2C, 76000 Rouen, France
| | - John R Pannell
- Department of Ecology and Evolution, University of Lausanne, 1015 Lausanne, Switzerland
| | - Mathilde Dufay
- CEFE, Univ Montpellier, CNRS, Univ Paul Valéry Montpellier 3, EPHE, IRD, Montpellier, France
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12
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Calabrese EJ, Agathokleous E. Pollen biology and hormesis: Pollen germination and pollen tube elongation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 762:143072. [PMID: 33139003 DOI: 10.1016/j.scitotenv.2020.143072] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/09/2020] [Accepted: 10/11/2020] [Indexed: 06/11/2023]
Abstract
This paper evaluated the occurrence of hormetic dose responses in pollen reported over the past eight decades. Hormetic doses responses were induced by a wide range of chemical and physical agents in 34 plant species for pollen germination and pollen tube growth/elongation. Agents inducing such hormetic dose/concentration responses in pollen included nutrients, growth-promoting agents, plant and animal hormones, toxic substances, including heavy metals such as cadmium, gaseous pollutants such as ozone, as well as ionizing and non-ionizing radiation. This paper provides further evidence for the broad generality of the hormesis dose response, supporting substantial prior findings that the hormetic response is independent of biological model, inducing agent, and endpoints measured. Given the widespread potential of inducing hormetic dose responses in pollen, these findings indicate the need to explore their emerging biological, ecological, agricultural, economic and public health implications.
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Affiliation(s)
- Edward J Calabrese
- Environmental Health Sciences, Morrill I, N344, University of Massachusetts, Amherst, MA 01007, United States of America.
| | - Evgenios Agathokleous
- Key Laboratory of Agrometeorology of Jiangsu Province, Institute of Ecology, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
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13
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Restricted Pollination for Tracing Individual Pollen Tubes in a Pistil. Methods Mol Biol 2021. [PMID: 32529429 DOI: 10.1007/978-1-0716-0672-8_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
As one of the essential steps to complete sexual reproduction, a pollen tube is precisely guided to an embryo sac to deliver the sperm cells. This ovule targeting by a pollen tube is one of the essential steps in pollen tube guidance. To assess the ovule targeting ability of the pollen tube from a certain mutant line, comparative analysis of pollen tube behaviors between wild-type and mutant genotypes is important. Here, we provide a protocol that traces all pollen tubes germinated from the quartet tetrad in a pistil by restricted pollination and aniline blue staining. By this analysis, statistical comparison between wild-type and the mutant pollen tube functions under the same in vivo condition is possible.
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14
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Characterization of Growth Behavior and the Resulting Forces Applied by Pollen Tubes in a 3D Matrix. Methods Mol Biol 2021. [PMID: 32529442 DOI: 10.1007/978-1-0716-0672-8_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The question of how pollen tubes orient themselves on their way to the egg cell is a major focus of plant reproduction research. The role of physical guidance through the tissues of the pistil in relation to the mechanical perception and growth adaptation of the pollen tubes has not been sufficiently investigated. In order to advance research on the mechanical perception of pollen tubes and their force application during invasive growth, we present simple methods for the observation and mechanical characterization of pollen tubes in vitro, which can be established with little effort in any biological laboratory with standard equipment. Pollen grains are germinated in a hydrogel containing agarose and their growth is recorded in 3D using brightfield microscopy. Using suitable analysis software, parameters such as growth rate and pollen tube diameter can then be determined to estimate the exerted penetration force.
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Paving the Way for Fertilization: The Role of the Transmitting Tract. Int J Mol Sci 2021; 22:ijms22052603. [PMID: 33807566 PMCID: PMC7961442 DOI: 10.3390/ijms22052603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/01/2021] [Accepted: 03/02/2021] [Indexed: 01/12/2023] Open
Abstract
Angiosperm reproduction relies on the precise growth of the pollen tube through different pistil tissues carrying two sperm cells into the ovules’ embryo sac, where they fuse with the egg and the central cell to accomplish double fertilization and ultimately initiate seed development. A network of intrinsic and tightly regulated communication and signaling cascades, which mediate continuous interactions between the pollen tube and the sporophytic and gametophytic female tissues, ensures the fast and meticulous growth of pollen tubes along the pistil, until it reaches the ovule embryo sac. Most of the pollen tube growth occurs in a specialized tissue—the transmitting tract—connecting the stigma, the style, and the ovary. This tissue is composed of highly secretory cells responsible for producing an extensive extracellular matrix. This multifaceted matrix is proposed to support and provide nutrition and adhesion for pollen tube growth and guidance. Insights pertaining to the mechanisms that underlie these processes remain sparse due to the difficulty of accessing and manipulating the female sporophytic tissues enclosed in the pistil. Here, we summarize the current knowledge on this key step of reproduction in flowering plants with special emphasis on the female transmitting tract tissue.
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Riglet L, Rozier F, Kodera C, Bovio S, Sechet J, Fobis-Loisy I, Gaude T. KATANIN-dependent mechanical properties of the stigmatic cell wall mediate the pollen tube path in Arabidopsis. eLife 2020; 9:57282. [PMID: 32867920 PMCID: PMC7462616 DOI: 10.7554/elife.57282] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 07/27/2020] [Indexed: 01/03/2023] Open
Abstract
Successful fertilization in angiosperms depends on the proper trajectory of pollen tubes through the pistil tissues to reach the ovules. Pollen tubes first grow within the cell wall of the papilla cells, applying pressure to the cell. Mechanical forces are known to play a major role in plant cell shape by controlling the orientation of cortical microtubules (CMTs), which in turn mediate deposition of cellulose microfibrils (CMFs). Here, by combining imaging, genetic and chemical approaches, we show that isotropic reorientation of CMTs and CMFs in aged Col-0 and katanin1-5 (ktn1-5) papilla cells is accompanied by a tendency of pollen tubes to coil around the papillae. We show that this coiled phenotype is associated with specific mechanical properties of the cell walls that provide less resistance to pollen tube growth. Our results reveal an unexpected role for KTN1 in pollen tube guidance on the stigma by ensuring mechanical anisotropy of the papilla cell wall. Flowering plants produce small particles known as pollen that – with the help of the wind, bees and other animals – carry male sex cells (sperm) to female sex cells (eggs) contained within flowers. When a grain of pollen lands on the female organ of a flower, called the pistil, it gives rise to a tube that grows through the pistil towards the egg cells at the base. The surface of the pistil is covered in a layer of long cells named papillae. Like most plant cells, the papillae are surrounded by a rigid structure known as the cell wall, which is mainly composed of strands known as microfibrils. The pollen tube exerts pressure on a papilla to allow it to grow through the cell wall towards the base of the pistil. Previous studies have shown that the pistil produces signals that guide pollen tubes to the eggs. However, it remains unclear how pollen tubes orient themselves on the surface of papillae to grow in the right direction through the pistil. Riglet et al. combined microscopy, genetic and chemical approaches to study how pollen tubes grow through the surface of the pistils of a small weed known as Arabidopsis thaliana. The experiments showed that an enzyme called KATANIN conferred mechanical properties to the cell walls of papillae that allowed pollen tubes to grow towards the egg cells, and also altered the orientation of the microfibrils in these cell walls. In A. thaliana plants that were genetically modified to lack KATANIN the pollen tubes coiled around the papillae and sometimes grew in the opposite direction to where the eggs were. KATANIN is known to cut structural filaments inside the cells of plants, animals and most other living things. By revealing an additional role for KATANIN in regulating the mechanical properties of the papilla cell wall, these findings indicate this enzyme may also regulate the mechanical properties of cells involved in other biological processes.
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Affiliation(s)
- Lucie Riglet
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
| | - Frédérique Rozier
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
| | - Chie Kodera
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
| | - Simone Bovio
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
| | - Julien Sechet
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Isabelle Fobis-Loisy
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
| | - Thierry Gaude
- Laboratoire de Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCBL, INRAE, Allée d'Italie, France
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17
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Internally Controlled Methods to Quantify Pollen Tube Growth and Penetration Defects in Arabidopsis thaliana. Methods Mol Biol 2020. [PMID: 32529433 DOI: 10.1007/978-1-0716-0672-8_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Double-fertilization in angiosperms requires precise communication between the male gametophyte (pollen), the female tissues, and the associated female gametophyte (embryo sac) to facilitate efficient fertilization. Numerous small molecules, proteins, and peptides have been shown to impact double-fertilization through the disruption of pollen germination, pollen tube growth, pollen tube guidance, or pollen tube penetration of the female tissues. The genetic basis of signaling events that lead to successful double-fertilization has been greatly facilitated by studies in the model organism Arabidopsis thaliana, which possesses a relatively simple reproductive physiology and a widely available T-DNA mutant seed collection. In this chapter, we detail methods for determining the effects of single gene loss-of-function mutations on pollen behavior through the creation of an internally controlled fluorescent hemizygous complement line. By transforming a single copy of the disrupted gene back into the homozygous mutant background, a precise endogenous control is generated due to the fact that pollen containing equal ratios of mutant and complemented pollen can be collected from a single flower. Using this experimental design, we describe multiple assays that can be performed in series to assess mutant pollen defects in germination, pollen tube elongation rate, and pistil penetration, which can be easily quantified alongside a "near-wildtype" complemented counterpart.
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18
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Guo J, Yang Z. Exocytosis and endocytosis: coordinating and fine-tuning the polar tip growth domain in pollen tubes. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:2428-2438. [PMID: 32173729 PMCID: PMC7178420 DOI: 10.1093/jxb/eraa134] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Accepted: 03/11/2020] [Indexed: 05/06/2023]
Abstract
Pollen tubes rapidly elongate, penetrate, and navigate through multiple female tissues to reach ovules for sperm delivery by utilizing a specialized form of polar growth known as tip growth. This process requires a battery of cellular activities differentially occurring at the apical growing region of the plasma membrane (PM), such as the differential cellular signaling involving calcium (Ca2+), phospholipids, and ROP-type Rho GTPases, fluctuation of ions and pH, exocytosis and endocytosis, and cell wall construction and remodeling. There is an emerging understanding of how at least some of these activities are coordinated and/or interconnected. The apical active ROP modulates exocytosis to the cell apex for PM and cell wall expansion differentially occurring at the tip. The differentiation of the cell wall involves at least the preferential distribution of deformable pectin polymers to the apex and non-deformable pectin polymers to the shank of pollen tubes, facilitating the apical cell expansion driven by high internal turgor pressure. Recent studies have generated inroads into how the ROP GTPase-based intracellular signaling is coordinated spatiotemporally with the external wall mechanics to maintain the tubular cell shape and how the apical cell wall mechanics are regulated to allow rapid tip growth while maintaining the cell wall integrity under the turgor pressure. Evidence suggests that exocytosis and endocytosis play crucial but distinct roles in this spatiotemporal coordination. In this review, we summarize recent advances in the regulation and coordination of the differential pectin distribution and the apical domain of active ROP by exocytosis and endocytosis in pollen tubes.
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Affiliation(s)
- Jingzhe Guo
- FAFU-UCR Joint Center for Horticultural Biology and Metabolomics, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, Fujian, China
- Department of Botany and Plant Sciences and Institute for Integrative Genome Biology, University of California, Riverside, CA, USA
| | - Zhenbiao Yang
- Department of Botany and Plant Sciences and Institute for Integrative Genome Biology, University of California, Riverside, CA, USA
- Correspondence:
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19
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Abstract
Reverse genetics approaches for characterizing phenotypes of mutants in a gene of interest (GOI) require thorough genotyping and phenotypic analysis. However, special challenges are encountered when a GOI is expressed in reproductive tissues: a variety of assays are required to characterize the phenotype and a mutant may show sporophytic and/or gametophytic defects in male and/or female reproductive tissues, which are structurally and functionally intertwined. Here, we present a streamlined workflow to characterize mutants with reproductive defects, primarily using Arabidopsis as a model, which can also be adapted to characterize mutants in other flowering plants. Procedures described here can be used to distinguish different kinds of reproductive defects and pinpoint the defective reproductive step(s) in a mutant. Although our procedures emphasize the characterization of mutants with male reproductive defects, they can nevertheless be used to identify female reproductive defects, as those defects could manifest alongside, and sometimes require, male reproductive tissues.
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20
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Ge Z, Zhao Y, Liu MC, Zhou LZ, Wang L, Zhong S, Hou S, Jiang J, Liu T, Huang Q, Xiao J, Gu H, Wu HM, Dong J, Dresselhaus T, Cheung AY, Qu LJ. LLG2/3 Are Co-receptors in BUPS/ANX-RALF Signaling to Regulate Arabidopsis Pollen Tube Integrity. Curr Biol 2019; 29:3256-3265.e5. [PMID: 31564495 PMCID: PMC7179479 DOI: 10.1016/j.cub.2019.08.032] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 07/11/2019] [Accepted: 08/13/2019] [Indexed: 01/05/2023]
Abstract
In angiosperms, two sperm cells are transported and delivered by the pollen tube to the ovule to achieve double fertilization. Extensive communication takes place between the pollen tube and the female tissues until the sperm cell cargo is ultimately released. During this process, a pollen tube surface-located receptor complex composed of ANXUR1/2 (ANX1/2) and Buddha's Paper Seal 1/2 (BUPS1/2) was reported to control the maintenance of pollen tube integrity by perceiving the autocrine peptide ligands rapid alkalinization factor 4 and 19 (RALF4/19). It was further hypothesized that pollen-tube rupture to release sperm is caused by the paracrine RALF34 peptide from the ovule interfering with this signaling pathway. In this study, we identified two Arabidopsis pollen-tube-expressed glycosylphosphatidylinositol-anchored proteins (GPI-APs), LORELEI-like-GPI-anchored protein 2 (LLG2) and LLG3, as co-receptors in the BUPS-ANX receptor complex. llg2 llg3 double mutants exhibit severe fertility defects. Mutant pollen tubes rupture early during the pollination process. Furthermore, LLG2 and LLG3 interact with ectodomains of both BUPSs and ANXURs, and this interaction is remarkably enhanced by the presence of RALF4/19 peptides. We further demonstrate that the N terminus (including a YISY motif) of the RALF4 peptide ligand interacts strongly with BUPS-ANX receptors but weakly with LLGs and is essential for its biological function, and its C-terminal region is sufficient for LLG binding. In conclusion, we propose that LLG2/3 serve as co-receptors during BUPS/ANX-RALF signaling and thereby further establish the importance of GPI-APs as key regulators in plant reproduction processes.
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Affiliation(s)
- Zengxiang Ge
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Yuling Zhao
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Ming-Che Liu
- Department of Biochemistry and Molecular Biology, Molecular and Cell Biology Program, Plant Biology Program, University of Massachusetts, Amherst, MA 01003, USA
| | - Liang-Zi Zhou
- Cell Biology and Plant Biochemistry, University of Regensburg, 93053 Regensburg, Germany
| | - Lele Wang
- Cell Biology and Plant Biochemistry, University of Regensburg, 93053 Regensburg, Germany
| | - Sheng Zhong
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Saiying Hou
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Jiahao Jiang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Tianxu Liu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Qingpei Huang
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Junyu Xiao
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China
| | - Hongya Gu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China; The National Plant Gene Research Center (Beijing), Beijing 100101, China
| | - Hen-Ming Wu
- Department of Biochemistry and Molecular Biology, Molecular and Cell Biology Program, Plant Biology Program, University of Massachusetts, Amherst, MA 01003, USA
| | - Juan Dong
- The Waksman Institute of Microbiology, Rutgers the State University of New Jersey, Piscataway, NJ 08854, USA
| | - Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, University of Regensburg, 93053 Regensburg, Germany
| | - Alice Y Cheung
- Department of Biochemistry and Molecular Biology, Molecular and Cell Biology Program, Plant Biology Program, University of Massachusetts, Amherst, MA 01003, USA
| | - Li-Jia Qu
- State Key Laboratory for Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences at College of Life Sciences, Peking University, Beijing 100871, China; The National Plant Gene Research Center (Beijing), Beijing 100101, China.
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21
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Lopes AL, Moreira D, Ferreira MJ, Pereira AM, Coimbra S. Insights into secrets along the pollen tube pathway in need to be discovered. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2979-2992. [PMID: 30820535 DOI: 10.1093/jxb/erz087] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Accepted: 02/08/2019] [Indexed: 06/09/2023]
Abstract
The process of plant fertilization provides an outstanding example of refined control of gene expression. During this elegant process, subtle communication occurs between neighboring cells, based on chemical signals, that induces cellular mechanisms of patterning and growth. Having faced an immediate issue of self-incompatibility responses, the pathway to fertilization starts once the stigmatic cells recognize a compatible pollen grain, and it continues with numerous players interacting to affect pollen tube growth and the puzzling process of navigation along the transmitting tract. The pollen tube goes through a guidance process that begins with a preovular stage (i.e. prior to the influence of the target ovule), with interactions with factors from the transmitting tissue. In the subsequent ovular-guidance stage a specific relationship develops between the pollen tube and its target ovule. This stage is divided into the funicular and micropylar guidance steps, with numerous receptors working in signalling cascades. Finally, just after the pollen tube has passed beyond the synergids, fusion of the gametes occurs and the developing seed-the ultimate aim of the process-will start to mature. In this paper, we review the existing knowledge of the crucial biological processes involved in pollen-pistil interactions that give rise to the new seed.
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Affiliation(s)
- Ana Lúcia Lopes
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
- Biosystems and Integrative Sciences Institute - BioISI, Porto, Portugal
- Sustainable Agrifood Production Research Centre - GreenUPorto, Vairão, Portugal
| | - Diana Moreira
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
| | - Maria João Ferreira
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
| | - Ana Marta Pereira
- Dipartimento di Bioscienze, Università Degli Studi di Milano, Milano, Italy
| | - Sílvia Coimbra
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Porto, Portugal
- Sustainable Agrifood Production Research Centre - GreenUPorto, Vairão, Portugal
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22
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Johnson MA, Harper JF, Palanivelu R. A Fruitful Journey: Pollen Tube Navigation from Germination to Fertilization. ANNUAL REVIEW OF PLANT BIOLOGY 2019; 70:809-837. [PMID: 30822112 DOI: 10.1146/annurev-arplant-050718-100133] [Citation(s) in RCA: 134] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In flowering plants, pollen tubes undergo tip growth to deliver two nonmotile sperm to the ovule where they fuse with an egg and central cell to achieve double fertilization. This extended journey involves rapid growth and changes in gene activity that manage compatible interactions with at least seven different cell types. Nearly half of the genome is expressed in haploid pollen, which facilitates genetic analysis, even of essential genes. These unique attributes make pollen an ideal system with which to study plant cell-cell interactions, tip growth, cell migration, the modulation of cell wall integrity, and gene expression networks. We highlight the signaling systems required for pollen tube navigation and the potential roles of Ca2+ signals. The dynamics of pollen development make sexual reproduction highly sensitive to heat stress. Understanding this vulnerability may generate strategies to improve seed crop yields that are under threat from climate change.
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Affiliation(s)
- Mark A Johnson
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, Rhode Island 02912, USA;
| | - Jeffrey F Harper
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, Nevada 89557, USA;
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23
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Ponvert N, Goldberg J, Leydon A, Johnson MA. Iterative subtraction facilitates automated, quantitative analysis of multiple pollen tube growth features. PLANT REPRODUCTION 2019; 32:45-54. [PMID: 30543045 DOI: 10.1007/s00497-018-00351-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 11/22/2018] [Indexed: 06/09/2023]
Abstract
In flowering plants, successful reproduction and generation of seed depends on the delivery of immotile sperm to female gametes via the pollen tube. As reproduction in flowering plants is the cornerstone of our agricultural industry, there is a need to uncover the genes, small molecules, and environmental conditions that affect pollen tube growth dynamics. However, methods for measuring pollen tube phenotypes are labor intensive, and suffer from a tradeoff between workload and resolution. To approach these problems, we use an image analysis technique called Automated Stack Iterative Subtraction (ASIST). Our tool converts growing pollen tube tips into closed particles, making the automated simultaneous extraction of multiple pollen tube phenotypes from hundreds of individual cells tractable via existing particle identification technology. Here we use our tool to analyze growth dynamics of pollen tubes in vitro, and semi in vivo. We show that ASIST provides a framework for robust, high throughput analysis of pollen tube growth behaviors in populations of cells, thus facilitating pollen tube phenomics.
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Affiliation(s)
- Nathaniel Ponvert
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, 02912, USA
| | - Jacob Goldberg
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, 02912, USA
| | - Alexander Leydon
- Department of Biology, University of Washington, Seattle, WA, 98195, USA
| | - Mark A Johnson
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, RI, 02912, USA.
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24
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Zhang F, Zhang YC, Zhang JP, Yu Y, Zhou YF, Feng YZ, Yang YW, Lei MQ, He H, Lian JP, Chen YQ. Rice UCL8, a plantacyanin gene targeted by miR408, regulates fertility by controlling pollen tube germination and growth. RICE (NEW YORK, N.Y.) 2018; 11:60. [PMID: 30456598 PMCID: PMC6242803 DOI: 10.1186/s12284-018-0253-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 11/07/2018] [Indexed: 05/21/2023]
Abstract
BACKGROUND Pollen tube formation and growth are crucial steps that lead to seed production. Despite the importance of pollen tube growth, the molecular mechanisms implicated in its spatial and temporal control are not fully known. In this study, we found an uclacyanin gene, OsUCL8, that regulates pollen intine deposition and pollen tube growth. FINDINGS The overexpression of OsUCL8 led to a striking irregularity in pollen tube growth and pollination and thus affected the seed setting rate in rice; many pollen tubes appeared to lose the ability to grow directly into the style. Conversely, plants with OsUCL8 knocked out and plants overexpressing miR408, a negative regulator of OsUCL8, had vigorous pollens with a higher germination rate. We further demonstrated that OsUCL8 mainly affects pollen intine formation. The addition of Vitamin B1 (VB1) significantly contributed to the germination of OXUCL8 pollen grains, suggesting that OsUCL8 could be associated with VB1 production. Using a yeast two-hybrid system, we revealed that OsUCL8 interacts with the protein OsPKIWI, a homolog of the Arabidopsis FNRL protein. We thus hypothesized that OsUCL8 might regulate the production of VB components by interacting with OsPKIWI. This study revealed a novel molecular mechanism of pollen tube growth regulation. CONCLUSIONS The rice plantacyanin family member OsUCL8 plays an important role in pollen tube formation and growth and, in turn, regulates fertility and the seed setting rate.
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Affiliation(s)
- Fan Zhang
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yu-Chan Zhang
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Jin-Ping Zhang
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yang Yu
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yan-Fei Zhou
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yan-Zhao Feng
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yu-Wei Yang
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Meng-Qi Lei
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Huang He
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Jian-Pin Lian
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yue-Qin Chen
- Guangdong Provincial Key Laboratory of Plant Resources, State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.
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25
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Mizuta Y, Higashiyama T. Chemical signaling for pollen tube guidance at a glance. J Cell Sci 2018; 131:131/2/jcs208447. [DOI: 10.1242/jcs.208447] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
ABSTRACT
Pollen tube guidance is a unique navigating system that is required for the successful sexual reproduction of plants. As plant sperm cells are non-motile and egg cells are embedded deep inside the female tissues, a pollen tube delivers the two sperm cells that it contains by growing towards the ovule, in which the egg cell resides. Pollen tube growth towards the ovule is precisely controlled and divided into two stages, preovular and ovular guidance. In this Cell Science at a Glance article and accompanying poster, we provide a comprehensive overview of pollen tube guidance and highlight some of the attractant peptides used during ovular guidance. We further discuss the precise one-to-one guidance system that exists in multi-ovular plants. The pollen tube-blocking system, which is mediated by male–female crosstalk communication, to avoid attraction of multiple pollen tubes, is also reviewed.
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Affiliation(s)
- Yoko Mizuta
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
| | - Tetsuya Higashiyama
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
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Moeder W, Yoshioka K. CNGCs break through-A rice cyclic nucleotide-gated channel paves the way for pollen tube growth. PLoS Genet 2017; 13:e1007066. [PMID: 29190294 PMCID: PMC5708612 DOI: 10.1371/journal.pgen.1007066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
- Wolfgang Moeder
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Keiko Yoshioka
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
- Center for the Analysis of Genome Evolution and Function (CAGEF), University of Toronto, Toronto, Ontario, Canada
- * E-mail:
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Zhu Q, Zhang XL, Nadir S, DongChen WH, Guo XQ, Zhang HX, Li CY, Chen LJ, Lee DS. A LysM Domain-Containing Gene OsEMSA1 Involved in Embryo sac Development in Rice ( Oryza sativa L.). FRONTIERS IN PLANT SCIENCE 2017; 8:1596. [PMID: 28979272 PMCID: PMC5611485 DOI: 10.3389/fpls.2017.01596] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/15/2017] [Accepted: 08/30/2017] [Indexed: 06/07/2023]
Abstract
The embryo sac plays a vital role in sexual reproduction of angiosperms. LysM domain containing proteins with multiple lysin motifs are widespread proteins and are involved in plant defense responses against fungal chitins and bacterial peptidoglycans. Various studies have reported the role of LysM domain-containing proteins in plant defense mechanisms but their involvement in sexual reproduction remains largely unknown. Here, we report the involvement of a LysM domain-containing gene, EMBRYO SAC 1 (OsEMSA1), in the sexual reproduction of rice. The gene encoded a LysM domain-containing protein that was necessary for embryo sac development and function. The gene was expressed in root, stem, leaf tissues, panicle and ovaries and had some putative role in hormone regulation. Suppression of OsEMSA1 expression resulted in a defective embryo sac with poor differentiation of gametophytic cells, which consequently failed to attract pollen tubes and so reduced the panicle seed-setting rate. Our data offers new insight into the functions of LysM domain-containing proteins in rice.
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Affiliation(s)
- Qian Zhu
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
| | - Xiao-Ling Zhang
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
| | - Sadia Nadir
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
- Department of Chemistry, University of Science and TechnologyBannu, Pakistan
| | - Wen-Hua DongChen
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
| | - Xiao-Qiong Guo
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
| | - Hui-Xin Zhang
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
| | - Cheng-Yun Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural UniversityKunming, China
- Key Laboratory for Agricultural Biodiversity and Pest Management of China Education Ministry, Yunnan Agricultural UniversityKunming, China
| | - Li-Juan Chen
- Rice Research Institute, Yunnan Agricultural UniversityKunming, China
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural UniversityKunming, China
| | - Dong-Sun Lee
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan Agricultural UniversityKunming, China
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28
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Pereira AM, Lopes AL, Coimbra S. Arabinogalactan Proteins as Interactors along the Crosstalk between the Pollen Tube and the Female Tissues. FRONTIERS IN PLANT SCIENCE 2016; 7:1895. [PMID: 28018417 PMCID: PMC5159419 DOI: 10.3389/fpls.2016.01895] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 11/30/2016] [Indexed: 05/19/2023]
Abstract
Arabinogalactan proteins (AGPs) have long been considered to be implicated in several steps of the reproductive process of flowering plants. Pollen tube growth along the pistil tissues requires a multiplicity of signaling pathways to be activated and turned off precisely, at crucial timepoints, to guarantee successful fertilization and seed production. In the recent years, an outstanding effort has been made by the plant reproduction scientific community in order to better understand this process. This resulted in the discovery of a fairly substantial number of new players essential for reproduction, as well as their modes of action and interactions. Besides all the indications of AGPs involvement in reproduction, there were no convincing evidences about it. Recently, several studies came out to prove what had long been suggested about this complex family of glycoproteins. AGPs consist of a large family of hydroxyproline-rich proteins, predicted to be anchored to the plasma membrane and extremely rich in sugars. These two last characteristics always made them perfect candidates to be involved in signaling mechanisms, in several plant developmental processes. New findings finally relate AGPs to concrete functions in plant reproduction. In this review, it is intended not only to describe how different molecules and signaling pathways are functioning to achieve fertilization, but also to integrate the recent discoveries about AGPs along this process.
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Affiliation(s)
- Ana M. Pereira
- Departamento de Biologia, Faculdade de Ciências da Universidade do PortoPorto, Portugal
- Biosystems and Integrative Sciences InstitutePorto, Portugal
| | - Ana L. Lopes
- Departamento de Biologia, Faculdade de Ciências da Universidade do PortoPorto, Portugal
- Biosystems and Integrative Sciences InstitutePorto, Portugal
| | - Sílvia Coimbra
- Departamento de Biologia, Faculdade de Ciências da Universidade do PortoPorto, Portugal
- Biosystems and Integrative Sciences InstitutePorto, Portugal
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Abstract
Compared with the animal kingdom, fertilization is particularly complex in flowering plants (angiosperms). Sperm cells of angiosperms have lost their motility and require transportation as a passive cargo by the pollen tube cell to the egg apparatus (egg cell and accessory synergid cells). Sperm cell release from the pollen tube occurs after intensive communication between the pollen tube cell and the receptive synergid, culminating in the lysis of both interaction partners. Following release of the two sperm cells, they interact and fuse with two dimorphic female gametes (the egg and the central cell) forming the major seed components embryo and endosperm, respectively. This process is known as double fertilization. Here, we review the current understanding of the processes of sperm cell reception, gamete interaction, their pre-fertilization activation and fusion, as well as the mechanisms plants use to prevent the fusion of egg cells with multiple sperm cells. The role of Ca(2+) is highlighted in these various processes and comparisons are drawn between fertilization mechanisms in flowering plants and other eukaryotes, including mammals.
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Affiliation(s)
- Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93040 Regensburg, Germany.
| | - Stefanie Sprunck
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, 93040 Regensburg, Germany
| | - Gary M Wessel
- Department of Molecular Biology, Cell Biology, and Biochemistry, Brown University, Providence, Rhode Island 02912, USA
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Ambrosino L, Bostan H, Ruggieri V, Chiusano ML. Bioinformatics resources for pollen. PLANT REPRODUCTION 2016; 29:133-147. [PMID: 27271281 DOI: 10.1007/s00497-016-0284-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 05/19/2016] [Indexed: 06/06/2023]
Abstract
Bioinformatics for Pollen. Pollen plays a key role in crop production, and its development is the most delicate phase in reproduction. Different metabolic pathways are involved in pollen development, and changes in the level of some metabolites, as well as responses to stress, are correlated with the reduction in pollen viability, leading consequently to a decrease in the fruit production. However, studies on pollen may be hard because gamete development and fertilization are complex processes that occur during a short window of time. The rise of the so-called -omics sciences provided key strategies to promote molecular research in pollen tissues, starting from model organisms and moving to increasing number of species. An integrated multi-level approach based on investigations from genomics, transcriptomics, proteomics and metabolomics appears now feasible to clarify key molecular processes in pollen development and viability. To this aim, bioinformatics has a fundamental role for data production and analysis, contributing varied and ad hoc methodologies, endowed with different sensitivity and specificity, necessary for extracting added-value information from the large amount of molecular data achievable. Bioinformatics is also essential for data management, organization, distribution and integration in suitable resources. This is necessary to catch the biological features of the pollen tissues and to design effective approaches to identifying structural or functional properties, enabling the modeling of the major involved processes in normal or in stress conditions. In this review, we provide an overview of the available bioinformatics resources for pollen, ranging from raw data collections to complete databases or platforms, when available, which include data and/or results from -omics efforts on the male gametophyte. Perspectives in the fields will also be described.
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Affiliation(s)
- Luca Ambrosino
- Department of Agricultural Sciences, University of Naples "Federico II", via Università 100, Portici (NA), 80055, Italy
| | - Hamed Bostan
- Department of Agricultural Sciences, University of Naples "Federico II", via Università 100, Portici (NA), 80055, Italy
| | - Valentino Ruggieri
- Department of Agricultural Sciences, University of Naples "Federico II", via Università 100, Portici (NA), 80055, Italy
| | - Maria Luisa Chiusano
- Department of Agricultural Sciences, University of Naples "Federico II", via Università 100, Portici (NA), 80055, Italy.
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31
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AtVPS41-mediated endocytic pathway is essential for pollen tube-stigma interaction in Arabidopsis. Proc Natl Acad Sci U S A 2016; 113:6307-12. [PMID: 27185920 DOI: 10.1073/pnas.1602757113] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
In flowering plants, extensive male-female interactions are required for successful fertilization in which various signaling cascades are involved. Prevacuolar compartments (PVC) and vacuoles are two types of subcellular compartments that terminate signal transduction by sequestrating signaling molecules in yeast and mammalian cells; however, the manner in which they might be involved in male-female interactions in plants is unknown. In this study, we identified Arabidopsis thaliana vacuolar protein sorting 41 (AtVPS41), encoded by a single-copy gene with sequence similarity to yeast Vps41p, as a new factor controlling pollen tube-stigma interaction. Loss of AtVPS41 function disrupted penetration of pollen tubes into the transmitting tissue and thus led to failed male transmission. In the pollen tubes, AtVPS41 protein is associated with PVCs and the tonoplast. We demonstrate that AtVPS41 is required for the late stage of the endocytic pathway (i.e., endomembrane trafficking from PVCs to vacuoles) because internalization of cell-surface molecules was normal in the vps41-deficient pollen tubes, whereas PVC-to-vacuole trafficking was impaired. We further show that the CHCR domain is required for subcellular localization and biological functioning of AtVPS41. These results indicate that the AtVPS41-mediated late stage of the endocytic pathway is essential for pollen tube-stigma interaction in Arabidopsis.
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Mizukami AG, Inatsugi R, Jiao J, Kotake T, Kuwata K, Ootani K, Okuda S, Sankaranarayanan S, Sato Y, Maruyama D, Iwai H, Garénaux E, Sato C, Kitajima K, Tsumuraya Y, Mori H, Yamaguchi J, Itami K, Sasaki N, Higashiyama T. The AMOR Arabinogalactan Sugar Chain Induces Pollen-Tube Competency to Respond to Ovular Guidance. Curr Biol 2016; 26:1091-7. [PMID: 27068416 DOI: 10.1016/j.cub.2016.02.040] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 01/24/2016] [Accepted: 02/12/2016] [Indexed: 01/26/2023]
Abstract
Precise directional control of pollen-tube growth by pistil tissue is critical for successful fertilization of flowering plants [1-3]. Ovular attractant peptides, which are secreted from two synergid cells on the side of the egg cell, have been identified [4-6]. Emerging evidence suggests that the ovular directional cue is not sufficient for successful guidance but that competency control by the pistil is critical for the response of pollen tubes to the attraction signal [1, 3, 7]. However, the female molecule for this competency induction has not been reported. Here we report that ovular methyl-glucuronosyl arabinogalactan (AMOR) induces competency of the pollen tube to respond to ovular attractant LURE peptides in Torenia fournieri. We developed a method for assaying the response capability of a pollen tube by micromanipulating an ovule. Using this method, we showed that pollen tubes growing through a cut style acquired a response capability in the medium by receiving a sufficient amount of a factor derived from mature ovules of Torenia. This factor, named AMOR, was identified as an arabinogalactan polysaccharide, the terminal 4-O-methyl-glucuronosyl residue of which was necessary for its activity. Moreover, a chemically synthesized disaccharide, the β isomer of methyl-glucuronosyl galactose (4-Me-GlcA-β-(1→6)-Gal), showed AMOR activity. No specific sugar-chain structure of plant extracellular matrix has been identified as a bioactive molecule involved in intercellular communication. We suggest that the AMOR sugar chain in the ovary renders the pollen tube competent to the chemotropic response prior to final guidance by LURE peptides.
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Affiliation(s)
- Akane G Mizukami
- JST ERATO, Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Rie Inatsugi
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jiao Jiao
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Toshihisa Kotake
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan
| | - Keiko Kuwata
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Kento Ootani
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Satohiro Okuda
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Subramanian Sankaranarayanan
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Yoshikatsu Sato
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Daisuke Maruyama
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Hiroaki Iwai
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan
| | - Estelle Garénaux
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
| | - Chihiro Sato
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
| | - Ken Kitajima
- Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
| | - Yoichi Tsumuraya
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama City, Saitama 338-8570, Japan
| | - Hitoshi Mori
- Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan
| | - Junichiro Yamaguchi
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Kenichiro Itami
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Narie Sasaki
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Tetsuya Higashiyama
- JST ERATO, Higashiyama Live-Holonics Project, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan; Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan.
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Lora J, Hormaza JI, Herrero M. The Diversity of the Pollen Tube Pathway in Plants: Toward an Increasing Control by the Sporophyte. FRONTIERS IN PLANT SCIENCE 2016; 7:107. [PMID: 26904071 PMCID: PMC4746263 DOI: 10.3389/fpls.2016.00107] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 01/20/2016] [Indexed: 05/06/2023]
Abstract
Plants, unlike animals, alternate multicellular diploid, and haploid generations in their life cycle. While this is widespread all along the plant kingdom, the size and autonomy of the diploid sporophyte and the haploid gametophyte generations vary along evolution. Vascular plants show an evolutionary trend toward a reduction of the gametophyte, reflected both in size and lifespan, together with an increasing dependence from the sporophyte. This has resulted in an overlooking of the importance of the gametophytic phase in the evolution of higher plants. This reliance on the sporophyte is most notorious along the pollen tube journey, where the male gametophytes have to travel a long way inside the sporophyte to reach the female gametophyte. Along evolution, there is a change in the scenery of the pollen tube pathway that favors pollen competition and selection. This trend, toward apparently making complicated what could be simple, appears to be related to an increasing control of the sporophyte over the gametophyte with implications for understanding plant evolution.
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Affiliation(s)
- Jorge Lora
- Department of Subtropical Fruit Crops, Instituto de Hortofruticultura Subtropical y Mediterránea La Mayora – University of Málaga – Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - José I. Hormaza
- Department of Subtropical Fruit Crops, Instituto de Hortofruticultura Subtropical y Mediterránea La Mayora – University of Málaga – Consejo Superior de Investigaciones CientíficasMálaga, Spain
| | - María Herrero
- Department of Pomology, Estación Experimental Aula Dei, Consejo Superior de Investigaciones CientíficasZaragoza, Spain
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Duan Q, Kita D, Johnson EA, Aggarwal M, Gates L, Wu HM, Cheung AY. Reactive oxygen species mediate pollen tube rupture to release sperm for fertilization in Arabidopsis. Nat Commun 2015; 5:3129. [PMID: 24451849 DOI: 10.1038/ncomms4129] [Citation(s) in RCA: 215] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 12/17/2013] [Indexed: 11/09/2022] Open
Abstract
In flowering plants, sperm are transported inside pollen tubes to the female gametophyte for fertilization. The female gametophyte induces rupture of the penetrating pollen tube, resulting in sperm release and rendering them available for fertilization. Here we utilize the Arabidopsis FERONIA (FER) receptor kinase mutants, whose female gametophytes fail to induce pollen tube rupture, to decipher the molecular mechanism of this critical male-female interactive step. We show that FER controls the production of high levels of reactive oxygen species at the entrance to the female gametophyte to induce pollen tube rupture and sperm release. Pollen tube growth assays in vitro and in the pistil demonstrate that hydroxyl free radicals are likely the most reactive oxygen molecules, and they induce pollen tube rupture in a Ca(2+)-dependent process involving Ca(2+) channel activation. Our results provide evidence for a RHO GTPase-based signalling mechanism to mediate sperm release for fertilization in plants.
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Affiliation(s)
- Qiaohong Duan
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2]
| | - Daniel Kita
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2] Molecular Cell Biology Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [3] [4]
| | - Eric A Johnson
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2] Molecular Cell Biology Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA
| | - Mini Aggarwal
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2] Plant Biology Graduate Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA
| | - Laura Gates
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2]
| | - Hen-Ming Wu
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2] Molecular Cell Biology Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA
| | - Alice Y Cheung
- 1] Department of Biochemistry and Molecular Biology, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [2] Molecular Cell Biology Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA [3] Plant Biology Graduate Program, University of Massachusetts, 710N. Pleasant Street, Lederle Graduate Research Tower, Amherst, Massachusetts 01003, USA
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35
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Same same but different: sperm-activating EC1 and ECA1 gametogenesis-related family proteins. Biochem Soc Trans 2015; 42:401-7. [PMID: 24646251 DOI: 10.1042/bst20140039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
During double fertilization in Arabidopsis thaliana, the egg cell secretes small cysteine-rich EC1 (egg cell 1) proteins, which enable the arriving sperm pair to rapidly interact with the two female gametes. EC1 proteins are members of the large and unexplored group of ECA1 (early culture abundant 1) gametogenesis-related family proteins, characterized by a prolamin-like domain with six conserved cysteine residues that may form three pairs of disulfide bonds. The distinguishing marks of egg-cell-expressed EC1 proteins are, however, two short amino acid sequence motifs present in all EC1-like proteins. EC1 genes appear to encode the major CRPs (cysteine-rich proteins) expressed by the plant egg cell, and they are restricted to flowering plants, including the most basal extant flowering plant Amborella trichopoda. Many other ECA1 gametogenesis-related family genes are preferentially expressed in the synergid cell. Functional diversification among the ECA1 gametogenesis-related family is suggested by the different patterns of expression in the female gametophyte and the low primary sequence conservation.
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36
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Zhan H, Zhong Y, Yang Z, Xia H. Enzyme activities of Arabidopsis inositol polyphosphate kinases AtIPK2α and AtIPK2β are involved in pollen development, pollen tube guidance and embryogenesis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2015; 82:758-71. [PMID: 25846941 DOI: 10.1111/tpj.12846] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 03/16/2015] [Accepted: 03/31/2015] [Indexed: 05/27/2023]
Abstract
Inositol polyphosphate kinase (IPK2) is a key component of inositol polyphosphate signaling. There are two highly homologous inositol polyphosphate kinases (AtIPK2α and AtIPK2β) in Arabidopsis. Previous studies that overexpressed or reduced the expression of AtIPK2α and AtIPK2β revealed their roles in auxiliary shoot branching, abiotic stress responses and root growth. Here, we report that AtIPK2α and AtIPK2β act redundantly during pollen development, pollen tube guidance and embryogenesis. Single knock-out mutants of atipk2α and atipk2β were indistinguishable from the wild type, whereas the atipk2α atipk2β double mutant could not be obtained. Detailed genetic and cytological investigations showed that the mutation of AtIPK2α and AtIPK2β resulted in severely reduced transmission of male gametophyte as a result of abnormal pollen development and defective pollen tube guidance. In addition, the early embryo development of the atipk2α atipk2β double mutant was also aborted. Expressing either catalytically inactive or substrate specificity-altered variants of AtIPK2β could not rescue the male gametophyte and embryogenesis defects of the atipk2α atipk2β double mutant, implying that the kinase activity of AtIPK2 is required for pollen development, pollen tube guidance and embryogenesis. Taken together, our results provide genetic evidence for the requirement of inositol polyphosphate signaling in plant sexual reproduction.
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Affiliation(s)
- Huadong Zhan
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, Hubei, 430072, China
| | - Yujiao Zhong
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, Hubei, 430072, China
| | - Zhongnan Yang
- College of Life and Environment Sciences, Shanghai Normal University, Shanghai, 200234, China
| | - Huijun Xia
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, Hubei, 430072, China
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37
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Rutley N, Twell D. A decade of pollen transcriptomics. PLANT REPRODUCTION 2015; 28:73-89. [PMID: 25761645 PMCID: PMC4432081 DOI: 10.1007/s00497-015-0261-7] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 02/24/2015] [Indexed: 05/19/2023]
Abstract
KEY MESSAGE Overview of pollen transcriptome studies. Pollen development is driven by gene expression, and knowledge of the molecular events underlying this process has undergone a quantum leap in the last decade through studies of the transcriptome. Here, we outline historical evidence for male haploid gene expression and review the wealth of pollen transcriptome data now available. Knowledge of the transcriptional capacity of pollen has progressed from genetic studies to the direct analysis of RNA and from gene-by-gene studies to analyses on a genomic scale. Microarray and/or RNA-seq data can now be accessed for all phases and cell types of developing pollen encompassing 10 different angiosperms. These growing resources have accelerated research and will undoubtedly inspire new directions and the application of system-based research into the mechanisms that govern the development, function and evolution of angiosperm pollen.
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Affiliation(s)
- Nicholas Rutley
- Department of Biology, University of Leicester, Leicester, LE1 7RH UK
| | - David Twell
- Department of Biology, University of Leicester, Leicester, LE1 7RH UK
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Pereira AM, Pereira LG, Coimbra S. Arabinogalactan proteins: rising attention from plant biologists. PLANT REPRODUCTION 2015; 28:1-15. [PMID: 25656950 DOI: 10.1007/s00497-015-0254-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 01/09/2015] [Indexed: 05/21/2023]
Abstract
Key message: AGP update: plant reproduction. Arabinogalactan proteins (AGPs) are a large family of hydroxyproline-rich proteins, heavily glycosylated, ubiquitous in land plants, including basal angiosperms and also in many algae. They have been shown to serve as important molecules in several steps of the reproductive process in plants. Due to their special characteristics, such as high sugar content and their means of association with the membrane, they are often perceived as likely candidates for many different aspects of the reproductive process such as signalling molecules, cell identity determinants, morphogens, nutrient sources and support for pollen tube growth, among others. Nevertheless, the study of these proteins pose many difficulties when it comes to studying them individually. Most of the work done involved the use of the β-glucosyl Yariv reagent and antibodies that recognize the carbohydrate epitopes only. Recently, new approaches have been used to study AGPs largely based in the remarkable growing volume of microarray data made available. Either using older techniques or the most recent ones, a clearer picture is emerging for the functions and mode of action of these molecules in the plant reproductive processes. Here, we present an overview about the most important studies made in this area, focusing on the latest advances and the possibilities for future studies in the field.
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Affiliation(s)
- Ana Marta Pereira
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal
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Leroux C, Bouton S, Kiefer-Meyer MC, Fabrice TN, Mareck A, Guénin S, Fournet F, Ringli C, Pelloux J, Driouich A, Lerouge P, Lehner A, Mollet JC. PECTIN METHYLESTERASE48 is involved in Arabidopsis pollen grain germination. PLANT PHYSIOLOGY 2015; 167:367-80. [PMID: 25524442 PMCID: PMC4326738 DOI: 10.1104/pp.114.250928] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 12/16/2014] [Indexed: 05/18/2023]
Abstract
Germination of pollen grains is a crucial step in plant reproduction. However, the molecular mechanisms involved remain unclear. We investigated the role of PECTIN METHYLESTERASE48 (PME48), an enzyme implicated in the remodeling of pectins in Arabidopsis (Arabidopsis thaliana) pollen. A combination of functional genomics, gene expression, in vivo and in vitro pollen germination, immunolabeling, and biochemical analyses was used on wild-type and Atpme48 mutant plants. We showed that AtPME48 is specifically expressed in the male gametophyte and is the second most expressed PME in dry and imbibed pollen grains. Pollen grains from homozygous mutant lines displayed a significant delay in imbibition and germination in vitro and in vivo. Moreover, numerous pollen grains showed two tips emerging instead of one in the wild type. Immunolabeling and Fourier transform infrared analyses showed that the degree of methylesterification of the homogalacturonan was higher in pme48-/- pollen grains. In contrast, the PME activity was lower in pme48-/-, partly due to a reduction of PME48 activity revealed by zymogram. Interestingly, the wild-type phenotype was restored in pme48-/- with the optimum germination medium supplemented with 2.5 mm calcium chloride, suggesting that in the wild-type pollen, the weakly methylesterified homogalacturonan is a source of Ca(2+) necessary for pollen germination. Although pollen-specific PMEs are traditionally associated with pollen tube elongation, this study provides strong evidence that PME48 impacts the mechanical properties of the intine wall during maturation of the pollen grain, which, in turn, influences pollen grain germination.
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Affiliation(s)
- Christelle Leroux
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Sophie Bouton
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Marie-Christine Kiefer-Meyer
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Tohnyui Ndinyanka Fabrice
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Alain Mareck
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Stéphanie Guénin
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Françoise Fournet
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Christoph Ringli
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Jérôme Pelloux
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Azeddine Driouich
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Patrice Lerouge
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Arnaud Lehner
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
| | - Jean-Claude Mollet
- Laboratoire Glycobiologie et Matrice Extracellulaire, Normandie Université, Institute for Research and Innovation in Biomedicine, Végétal, Agronomie, Sol, et Innovation, 76821 Mont-Saint-Aignan, France (C.L., M.-C.K.-M., A.M., A.D., P.L., A.L., J.-C.M.);Unité Biologie des Plantes et Innovation (S.B., S.G., F.F., J.P.) and Centre de Ressources Régionales en Biologie Moléculaire (S.G.), Université de Picardie Jules Verne, 80039 Amiens, France; andInstitute of Plant Biology, University of Zürich, 8008 Zurich, Switzerland (T.N.F., C.R.)
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Brito MS, Bertolino LT, Cossalter V, Quiapim AC, DePaoli HC, Goldman GH, Teixeira SP, Goldman MHS. Pollination triggers female gametophyte development in immature Nicotiana tabacum flowers. FRONTIERS IN PLANT SCIENCE 2015; 6:561. [PMID: 26257764 PMCID: PMC4510347 DOI: 10.3389/fpls.2015.00561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Accepted: 07/07/2015] [Indexed: 05/10/2023]
Abstract
In Nicotiana tabacum, female gametophytes are not fully developed at anthesis, but flower buds pollinated 12 h before anthesis produce mature embryo sacs. We investigated several pollination-associated parameters in N. tabacum flower buds to determine the developmental timing of important events in preparation for successful fertilization. First, we performed hand pollinations in flowers from stages 4 to 11 to study at which developmental stage pollination would produce fruits. A Peroxtesmo test was performed to correlate peroxidase activity on the stigma surface, indicative of stigma receptivity, with fruit set. Pollen tube growth and female gametophyte development were microscopically analyzed in pistils of different developmental stages. Fruits were obtained only after pollinations of flower buds at late stage 7 and older; fruit weight and seed germination capacity increased as the developmental stage of the pollinated flower approached anthesis. Despite positive peroxidase activity and pollen tube growth, pistils at stages 5 and 6 were unable to produce fruits. At late stage 7, female gametophytes were undergoing first mitotic division. After 24 h, female gametophytes of unpollinated pistils were still in the end of the first division, whereas those of pollinated pistils showed egg cells. RT-qPCR assay showed that the expression of the NtEC1 gene, a marker of egg cell development, is considerably higher in pollinated late stage 7 ovaries compared with unpollinated ovaries. To test whether ethylene is the signal eliciting female gametophyte maturation, the expression of ACC synthase was examined in unpollinated and pollinated stage 6 and late stage 7 stigmas/styles. Pollination induced NtACS expression in stage 6 pistils, which are unable to produce fruits. Our results show that pollination is a stimulus capable of triggering female gametophyte development in immature tobacco flowers and suggests the existence of a yet undefined signal sensed by the pistil.
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Affiliation(s)
- Michael S. Brito
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
- Programa de Pós-Graduação em Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
- Programa de Pós-Graduação em Genética e Melhoramento de Plantas, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista “Júlio de Mesquita Filho,”Jaboticabal, Brazil
| | - Lígia T. Bertolino
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
- Programa de Pós-Graduação em Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Viviane Cossalter
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Andréa C. Quiapim
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Henrique C. DePaoli
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
- Programa de Pós-Graduação em Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Gustavo H. Goldman
- Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Simone P. Teixeira
- Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
| | - Maria H. S. Goldman
- Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São PauloRibeirão Preto, Brazil
- *Correspondence: Maria H. S. Goldman, Departamento de Biologia, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Avenida Bandeirantes, 3900 Ribeirão Preto, SP – CEP 14040-901, Brazil,
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Higashiyama T, Takeuchi H. The mechanism and key molecules involved in pollen tube guidance. ANNUAL REVIEW OF PLANT BIOLOGY 2015; 66:393-413. [PMID: 25621518 DOI: 10.1146/annurev-arplant-043014-115635] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
During sexual reproduction of flowering plants, pollen tube guidance by pistil tissue is critical for the delivery of nonmotile sperm cells to female gametes. Multistep controls of pollen tube guidance can be divided into two phases: preovular guidance and ovular guidance. During preovular guidance, various female molecules, including stimulants for pollen germination and pollen tube growth, are provided to support tube growth toward the ovary, where the ovules are located. After entering the ovary, pollen tubes receive directional cues from their respective target ovules, including attractant peptides for precise, species-preferential attraction. Successful pollen tube guidance in the pistil requires not only nutritional and directional controls but also competency controls to make pollen tubes responsive to guidance cues, regulation to terminate growth once a pollen tube arrives at the target, and strategies to stop ovular attraction depending on the fertilization of female gametes.
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Dardelle F, Le Mauff F, Lehner A, Loutelier-Bourhis C, Bardor M, Rihouey C, Causse M, Lerouge P, Driouich A, Mollet JC. Pollen tube cell walls of wild and domesticated tomatoes contain arabinosylated and fucosylated xyloglucan. ANNALS OF BOTANY 2015; 115:55-66. [PMID: 25434027 PMCID: PMC4284112 DOI: 10.1093/aob/mcu218] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 09/22/2014] [Accepted: 09/23/2014] [Indexed: 05/24/2023]
Abstract
BACKGROUND AND AIMS In flowering plants, fertilization relies on the delivery of the sperm cells carried by the pollen tube to the ovule. During the tip growth of the pollen tube, proper assembly of the cell wall polymers is required to maintain the mechanical properties of the cell wall. Xyloglucan (XyG) is a cell wall polymer known for maintaining the wall integrity and thus allowing cell expansion. In most angiosperms, the XyG of somatic cells is fucosylated, except in the Asterid clade (including the Solanaceae), where the fucosyl residues are replaced by arabinose, presumably due to an adaptive and/or selective diversification. However, it has been shown recently that XyG of Nicotiana alata pollen tubes is mostly fucosylated. The objective of the present work was to determine whether such structural differences between somatic and gametophytic cells are a common feature of Nicotiana and Solanum (more precisely tomato) genera. METHODS XyGs of pollen tubes of domesticated (Solanum lycopersicum var. cerasiforme and var. Saint-Pierre) and wild (S. pimpinellifolium and S. peruvianum) tomatoes and tobacco (Nicotiana tabacum) were analysed by immunolabelling, oligosaccharide mass profiling and GC-MS analyses. KEY RESULTS Pollen tubes from all the species were labelled with the mAb CCRC-M1, a monoclonal antibody that recognizes epitopes associated with fucosylated XyG motifs. Analyses of the cell wall did not highlight major structural differences between previously studied N. alata and N. tabacum XyG. In contrast, XyG of tomato pollen tubes contained fucosylated and arabinosylated motifs. The highest levels of fucosylated XyG were found in pollen tubes from the wild species. CONCLUSIONS The results clearly indicate that the male gametophyte (pollen tube) and the sporophyte have structurally different XyG. This suggests that fucosylated XyG may have an important role in the tip growth of pollen tubes, and that they must have a specific set of functional XyG fucosyltransferases, which are yet to be characterized.
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Affiliation(s)
- Flavien Dardelle
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - François Le Mauff
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Arnaud Lehner
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Corinne Loutelier-Bourhis
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Muriel Bardor
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Christophe Rihouey
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Mathilde Causse
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Patrice Lerouge
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Azeddine Driouich
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
| | - Jean-Claude Mollet
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), EA 4358, Normandy University, IRIB, VASI, 76821 Mont-Saint-Aignan Cedex, France, COBRA, UMR6014 and FR3038, Normandy University, INSA Rouen, CNRS, IRCOF, 76821 Mont-Saint-Aignan Cedex, France, Laboratoire Polymères, Biopolymères, Surfaces, UMR CNRS 6270, Normandy University, 76821 Mont-Saint-Aignan Cedex, France and Génétique et Amélioration des Fruits et Légumes, INRA UR1052, 84143 Montfavet Cedex, France
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Onelli E, Idilli AI, Moscatelli A. Emerging roles for microtubules in angiosperm pollen tube growth highlight new research cues. FRONTIERS IN PLANT SCIENCE 2015; 6:51. [PMID: 25713579 PMCID: PMC4322846 DOI: 10.3389/fpls.2015.00051] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/20/2015] [Indexed: 05/21/2023]
Abstract
In plants, actin filaments have an important role in organelle movement and cytoplasmic streaming. Otherwise microtubules (MTs) have a role in restricting organelles to specific areas of the cell and in maintaining organelle morphology. In somatic plant cells, MTs also participate in cell division and morphogenesis, allowing cells to take their definitive shape in order to perform specific functions. In the latter case, MTs influence assembly of the cell wall, controlling the delivery of enzymes involved in cellulose synthesis and of wall modulation material to the proper sites. In angiosperm pollen tubes, organelle movement is generally attributed to the acto-myosin system, the main role of which is in distributing organelles in the cytoplasm and in carrying secretory vesicles to the apex for polarized growth. Recent data on membrane trafficking suggests a role of MTs in fine delivery and repositioning of vesicles to sustain pollen tube growth. This review examines the role of MTs in secretion and endocytosis, highlighting new research cues regarding cell wall construction and pollen tube-pistil crosstalk, that help unravel the role of MTs in polarized growth.
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Affiliation(s)
| | - Aurora I. Idilli
- Institute of Biophysics, National Research Council and Fondazione Bruno Kessler, Trento, Italy
| | - Alessandra Moscatelli
- Department of Biosciences, University of Milan, Milan, Italy
- *Correspondence: Alessandra Moscatelli, Department of Biosciences, University of Milan, Via Celoria, 26, 20113 Milano, Italy e-mail:
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Kessler SA, Lindner H, Jones DS, Grossniklaus U. Functional analysis of related CrRLK1L receptor-like kinases in pollen tube reception. EMBO Rep 2014; 16:107-15. [PMID: 25490905 DOI: 10.15252/embr.201438801] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The Catharanthus roseus Receptor-Like Kinase 1-like (CrRLK1L) family of 17 receptor-like kinases (RLKs) has been implicated in a variety of signaling pathways in Arabidopsis, ranging from pollen tube (PT) reception and tip growth to hormonal responses. The extracellular domains of these RLKs have malectin-like domains predicted to bind carbohydrate moieties. Domain swap analysis showed that the extracellular domains of the three members analyzed (FER, ANX1, HERK1) are not interchangeable, suggesting distinct upstream components, such as ligands and/or co-factors. In contrast, their intercellular domains are functionally equivalent for PT reception, indicating that they have common downstream targets in their signaling pathways. The kinase domain is necessary for FER function, but kinase activity itself is not, indicating that other kinases may be involved in signal transduction during PT reception.
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Affiliation(s)
- Sharon A Kessler
- Institute of Plant Biology & Zürich-Basel Plant Science Center, University of Zürich, Zürich, Switzerland Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA
| | - Heike Lindner
- Institute of Plant Biology & Zürich-Basel Plant Science Center, University of Zürich, Zürich, Switzerland
| | - Daniel S Jones
- Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, USA
| | - Ueli Grossniklaus
- Institute of Plant Biology & Zürich-Basel Plant Science Center, University of Zürich, Zürich, Switzerland
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Martin MV, Distéfano AM, Bellido A, Córdoba JP, Soto D, Pagnussat GC, Zabaleta E. Role of mitochondria during female gametophyte development and fertilization in A. thaliana. Mitochondrion 2014; 19 Pt B:350-6. [DOI: 10.1016/j.mito.2014.01.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Revised: 01/27/2014] [Accepted: 01/31/2014] [Indexed: 10/25/2022]
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Sanati Nezhad A, Packirisamy M, Geitmann A. Dynamic, high precision targeting of growth modulating agents is able to trigger pollen tube growth reorientation. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2014; 80:185-95. [PMID: 25041411 DOI: 10.1111/tpj.12613] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 07/02/2014] [Accepted: 07/04/2014] [Indexed: 05/06/2023]
Abstract
The pollen tube is the most rapidly growing cell in the plant kingdom and has the function to deliver the sperm cells for fertilization. The growing tip region of the cell behaves in a chemotropic manner to respond to the guidance cues emitted by the pistil and the female gametophyte, but how it perceives and responds to these directional triggers is virtually unknown. Quantitative assessment of chemotropic behavior can greatly be enhanced by the administration of pharmacological or other biologically active agents at subcellular precision, which is a technical challenge when the target area moves as it grows. We developed a laminar flow based microfluidic device that allows for continuous administration of two different solutions with a movable interface that permits the dynamic targeting of the growing pollen tube apex over prolonged periods of time. Asymmetric administration of calcium revealed that rather than following the highest calcium concentration as would be expected with simple chemotropic behavior, the pollen tube of Camellia targets an optimal concentration suggesting the presence of two superimposed mechanisms. Subcellular application of pectin methyl esterase (PME), an enzyme that modifies the growth behavior by rigidifying the pollen tube cell wall, caused the tube to turn away from the agent - providing important evidence for a previously proposed conceptual model of the growth mechanism.
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Affiliation(s)
- Amir Sanati Nezhad
- Optical-Bio Microsystems Laboratory, Mechanical Engineering, Concordia University, 1515 St. Catherine St., West, Montreal, QC, H3G 1M8, Canada
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Pereira AM, Masiero S, Nobre MS, Costa ML, Solís MT, Testillano PS, Sprunck S, Coimbra S. Differential expression patterns of arabinogalactan proteins in Arabidopsis thaliana reproductive tissues. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:5459-71. [PMID: 25053647 PMCID: PMC4400541 DOI: 10.1093/jxb/eru300] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Revised: 06/12/2014] [Accepted: 06/15/2014] [Indexed: 05/05/2023]
Abstract
Arabinogalactan proteins (AGPs) are heavily glycosylated proteins existing in all members of the plant kingdom and are differentially distributed through distinctive developmental stages. Here, we showed the individual distributions of specific Arabidopsis AGPs: AGP1, AGP9, AGP12, AGP15, and AGP23, throughout reproductive tissues and indicated their possible roles in several reproductive processes. AGP genes specifically expressed in female tissues were identified using available microarray data. This selection was confirmed by promoter analysis using multiple green fluorescent protein fusions to a nuclear localization signal, β-glucuronidase fusions, and in situ hybridization as approaches to confirm the expression patterns of the AGPs. Promoter analysis allowed the detection of a specific and differential presence of these proteins along the pathway followed by the pollen tube during its journey to reach the egg and the central cell inside the embryo sac. AGP1 was expressed in the stigma, style, transmitting tract, and the chalazal and funiculus tissues of the ovules. AGP9 was present along the vasculature of the reproductive tissues and AGP12 was expressed in the stigmatic cells, chalazal and funiculus cells of the ovules, and in the septum. AGP15 was expressed in all pistil tissues, except in the transmitting tract, while AGP23 was specific to the pollen grain and pollen tube. The expression pattern of these AGPs provides new evidence for the detection of a subset of specific AGPs involved in plant reproductive processes, being of significance for this field of study. AGPs are prominent candidates for male-female communication during reproduction.
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Affiliation(s)
- Ana Marta Pereira
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal Center for Biodiversity, Functional & Integrative Genomics (BioFIG), Porto, Portugal Dipartimento di BioScienze, Università degli Studi di Milano, 20133 Milan, Italy
| | - Simona Masiero
- Dipartimento di BioScienze, Università degli Studi di Milano, 20133 Milan, Italy
| | - Margarida Sofia Nobre
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - Mário Luís Costa
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal Center for Biodiversity, Functional & Integrative Genomics (BioFIG), Porto, Portugal
| | - María-Teresa Solís
- Pollen Biotechnology of Crop Plants Group, Centro de Investigaciones Biológicas (CIB) CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Pilar S Testillano
- Pollen Biotechnology of Crop Plants Group, Centro de Investigaciones Biológicas (CIB) CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain
| | - Stefanie Sprunck
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
| | - Sílvia Coimbra
- Departamento de Biologia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal Center for Biodiversity, Functional & Integrative Genomics (BioFIG), Porto, Portugal
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Vogler F, Schmalzl C, Englhart M, Bircheneder M, Sprunck S. Brassinosteroids promote Arabidopsis pollen germination and growth. PLANT REPRODUCTION 2014; 27:153-67. [PMID: 25077683 DOI: 10.1007/s00497-014-0247-x] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 07/07/2014] [Indexed: 05/08/2023]
Abstract
Pollen tubes are among the fastest tip-growing plant cells and represent an excellent experimental system for studying the dynamics and spatiotemporal control of polarized cell growth. However, investigating pollen tube tip growth in the model plant Arabidopsis remains difficult because in vitro pollen germination and pollen tube growth rates are highly variable and largely different from those observed in pistils, most likely due to growth-promoting properties of the female reproductive tract. We found that in vitro grown Arabidopsis pollen respond to brassinosteroid (BR) in a dose-dependent manner. Pollen germination and pollen tube growth increased nine- and fivefold, respectively, when media were supplemented with 10 µM epibrassinolide (epiBL), resulting in growth kinetics more similar to growth in vivo. Expression analyses show that the promoter of one of the key enzymes in BR biosynthesis, CYP90A1/CPD, is highly active in the cells of the reproductive tract that form the pathway for pollen tubes from the stigma to the ovules. Pollen tubes grew significantly shorter through the reproductive tract of a cyp90a1 mutant compared to the wild type, or to a BR perception mutant. Our results show that epiBL promotes pollen germination and tube growth in vitro and suggest that the cells of the reproductive tract provide BR compounds to stimulate pollen tube growth.
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Affiliation(s)
- Frank Vogler
- Cell Biology and Plant Biochemistry, Biochemistry Center Regensburg, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
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Heydlauff J, Groß-Hardt R. Love is a battlefield: programmed cell death during fertilization. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:1323-30. [PMID: 24567492 DOI: 10.1093/jxb/eru030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Plant development and growth is sustained by the constant generation of tremendous amounts of cells, which become integrated into various types of tissues and organs. What is all too often overlooked is that this thriving life also requires the targeted degeneration of selected cells, which undergo cell death according to genetically encoded programmes or environmental stimuli. The side-by-side existence of generation and demise is particularly evident in the haploid phase of the flowering plants cycle. Here, the lifespan of terminally differentiated accessory cells contrasts with that of germ cells, which by definition live on to form the next generation. In fact, with research in recent years it is becoming increasingly clear that the gametophytes of flowering plants constitute an attractive and powerful system for investigating the molecular mechanisms underlying selective cell death.
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Affiliation(s)
- Juliane Heydlauff
- Center for Plant Molecular Biology (ZMBP), University of Tuebingen, Auf der Morgenstelle 1, D-72076 Tübingen, Germany
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Bleckmann A, Alter S, Dresselhaus T. The beginning of a seed: regulatory mechanisms of double fertilization. FRONTIERS IN PLANT SCIENCE 2014; 5:452. [PMID: 25309552 PMCID: PMC4160995 DOI: 10.3389/fpls.2014.00452] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 08/21/2014] [Indexed: 05/20/2023]
Abstract
THE LAUNCH OF SEED DEVELOPMENT IN FLOWERING PLANTS (ANGIOSPERMS) IS INITIATED BY THE PROCESS OF DOUBLE FERTILIZATION: two male gametes (sperm cells) fuse with two female gametes (egg and central cell) to form the precursor cells of the two major seed components, the embryo and endosperm, respectively. The immobile sperm cells are delivered by the pollen tube toward the ovule harboring the female gametophyte by species-specific pollen tube guidance and attraction mechanisms. After pollen tube burst inside the female gametophyte, the two sperm cells fuse with the egg and central cell initiating seed development. The fertilized central cell forms the endosperm while the fertilized egg cell, the zygote, will form the actual embryo and suspensor. The latter structure connects the embryo with the sporophytic maternal tissues of the developing seed. The underlying mechanisms of double fertilization are tightly regulated to ensure delivery of functional sperm cells and the formation of both, a functional zygote and endosperm. In this review we will discuss the current state of knowledge about the processes of directed pollen tube growth and its communication with the synergid cells resulting in pollen tube burst, the interaction of the four gametes leading to cell fusion and finally discuss mechanisms how flowering plants prevent multiple sperm cell entry (polyspermy) to maximize their reproductive success.
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Affiliation(s)
- Andrea Bleckmann
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of RegensburgRegensburg, Germany
| | - Svenja Alter
- Plant Breeding, Center of Life and Food Sciences Weihenstephan, Technische Universität MünchenFreising, Germany
| | - Thomas Dresselhaus
- Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of RegensburgRegensburg, Germany
- *Correspondence: Thomas Dresselhaus, Cell Biology and Plant Biochemistry, Biochemie-Zentrum Regensburg, University of Regensburg, Universitätsstrasse 18, 93053 Regensburg, Germany e-mail:
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