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Zuo X, Wang S, Liu X, Tang T, Li Y, Tong L, Shah K, Ma J, An N, Zhao C, Xing L, Zhang D. FLOWERING LOCUS T1 and TERMINAL FLOWER1 regulatory networks mediate flowering initiation in apple. PLANT PHYSIOLOGY 2024; 195:580-597. [PMID: 38366880 DOI: 10.1093/plphys/kiae086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 12/01/2023] [Accepted: 01/07/2024] [Indexed: 02/18/2024]
Abstract
Flower bud formation is a critical process that directly determines yield and fruit quality in fruit crops. Floral induction is modulated by the balance between 2 flowering-related proteins, FLOWERING LOCUS T (FT) and TERMINAL FLOWER1 (TFL1); however, the mechanisms underlying the establishment and maintenance of this dynamic balance remain largely elusive. Here, we showed that in apple (Malus × domestica Borkh.), MdFT1 is predominantly expressed in spur buds and exhibits an increase in expression coinciding with flower induction; in contrast, MdTFL1 exhibited downregulation in apices during flower induction, suggesting that MdTFL1 has a role in floral repression. Interestingly, both the MdFT1 and MdTFL1 transcripts are directly regulated by transcription factor basic HELIX-LOOP-HELIX48 (MdbHLH48), and overexpression of MdbHLH48 in Arabidopsis (Arabidopsis thaliana) and tomato (Solanum lycopersicum) results in accelerated flowering. Binding and activation analyses revealed that MdbHLH48 functions as a positive regulator of MdFT1 and a negative regulator of MdTFL1. Further studies established that both MdFT1 and MdTFL1 interact competitively with MdWRKY6 protein to facilitate and inhibit, respectively, MdWRKY6-mediated transcriptional activation of target gene APPLE FLORICAULA/LFY (AFL1, an apple LEAFY-like gene), ultimately regulating apple flower bud formation. These findings illustrate the fine-tuned regulation of flowering by the MdbHLH48-MdFT1/MdTFL1-MdWRKY6 module and provide insights into flower bud formation in apples.
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Affiliation(s)
- Xiya Zuo
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Shixiang Wang
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiuxiu Liu
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Ting Tang
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Youmei Li
- College of Horticulture and Landscape, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Lu Tong
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Kamran Shah
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Juanjuan Ma
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Na An
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Caiping Zhao
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Libo Xing
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Dong Zhang
- College of Horticulture, Yangling Sub-Center of National Center for Apple Improvement, Northwest A&F University, Yangling, Shaanxi 712100, China
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Guerrero C, Cerezo S, Feito I, Rodríguez L, Samach A, Mercado JA, Pliego-Alfaro F, Palomo-Ríos E. Effect of heterologous expression of FT gene from Medicago truncatula in growth and flowering behavior of olive plants. FRONTIERS IN PLANT SCIENCE 2024; 15:1323087. [PMID: 38455727 PMCID: PMC10917891 DOI: 10.3389/fpls.2024.1323087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 01/31/2024] [Indexed: 03/09/2024]
Abstract
Olive (Olea europaea L. subsp. europaea) is one of the most important crops of the Mediterranean Basin and temperate areas worldwide. Obtaining new olive varieties adapted to climatic changing conditions and to modern agricultural practices, as well as other traits such as biotic and abiotic stress resistance and increased oil quality, is currently required; however, the long juvenile phase, as in most woody plants, is the bottleneck in olive breeding programs. Overexpression of genes encoding the 'florigen' Flowering Locus T (FT), can cause the loss of the juvenile phase in many perennials including olives. In this investigation, further characterization of three transgenic olive lines containing an FT encoding gene from Medicago truncatula, MtFTa1, under the 35S CaMV promoter, was carried out. While all three lines flowered under in vitro conditions, one of the lines stopped flowering after acclimatisation. In soil, all three lines exhibited a modified plant architecture; e.g., a continuous branching behaviour and a dwarfing growth habit. Gene expression and hormone content in shoot tips, containing the meristems from which this phenotype emerged, were examined. Higher levels of OeTFL1, a gene encoding the flowering repressor TERMINAL FLOWER 1, correlated with lack of flowering. The branching phenotype correlated with higher content of salicylic acid, indole-3-acetic acid and isopentenyl adenosine, and lower content of abscisic acid. The results obtained confirm that heterologous expression of MtFTa1 in olive induced continuous flowering independently of environmental factors, but also modified plant architecture. These phenotypical changes could be related to the altered hormonal content in transgenic plants.
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Affiliation(s)
- Consuelo Guerrero
- Departamento de Botánica y Fisiología Vegetal, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga, Spanish National Research Council (IHSM-UMA-CSIC), Málaga, Spain
| | - Sergio Cerezo
- Departamento de Botánica y Fisiología Vegetal, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga, Spanish National Research Council (IHSM-UMA-CSIC), Málaga, Spain
| | - Isabel Feito
- Servicio Regional de Investigación y Desarrollo Agroalimentario de Asturias, Finca Experimental “La Mata”, Grado, Spain
| | - Lucía Rodríguez
- Servicio Regional de Investigación y Desarrollo Agroalimentario de Asturias, Finca Experimental “La Mata”, Grado, Spain
| | - Alon Samach
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - José A. Mercado
- Departamento de Botánica y Fisiología Vegetal, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga, Spanish National Research Council (IHSM-UMA-CSIC), Málaga, Spain
| | - Fernando Pliego-Alfaro
- Departamento de Botánica y Fisiología Vegetal, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga, Spanish National Research Council (IHSM-UMA-CSIC), Málaga, Spain
| | - Elena Palomo-Ríos
- Departamento de Botánica y Fisiología Vegetal, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga, Spanish National Research Council (IHSM-UMA-CSIC), Málaga, Spain
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Martín-Valmaseda M, Devin SR, Ortuño-Hernández G, Pérez-Caselles C, Mahdavi SME, Bujdoso G, Salazar JA, Martínez-Gómez P, Alburquerque N. CRISPR/Cas as a Genome-Editing Technique in Fruit Tree Breeding. Int J Mol Sci 2023; 24:16656. [PMID: 38068981 PMCID: PMC10705926 DOI: 10.3390/ijms242316656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 12/18/2023] Open
Abstract
CRISPR (short for "Clustered Regularly Interspaced Short Palindromic Repeats") is a technology that research scientists use to selectively modify the DNA of living organisms. CRISPR was adapted for use in the laboratory from the naturally occurring genome-editing systems found in bacteria. In this work, we reviewed the methods used to introduce CRISPR/Cas-mediated genome editing into fruit species, as well as the impacts of the application of this technology to activate and knock out target genes in different fruit tree species, including on tree development, yield, fruit quality, and tolerance to biotic and abiotic stresses. The application of this gene-editing technology could allow the development of new generations of fruit crops with improved traits by targeting different genetic segments or even could facilitate the introduction of traits into elite cultivars without changing other traits. However, currently, the scarcity of efficient regeneration and transformation protocols in some species, the fact that many of those procedures are genotype-dependent, and the convenience of segregating the transgenic parts of the CRISPR system represent the main handicaps limiting the potential of genetic editing techniques for fruit trees. Finally, the latest news on the legislation and regulations about the use of plants modified using CRISPR/Cas systems has been also discussed.
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Affiliation(s)
- Marina Martín-Valmaseda
- Fruit Biotechnology Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain (C.P.-C.); (N.A.)
| | - Sama Rahimi Devin
- Department of Horticultural Science, College of Agriculture, Shiraz University, Shiraz 7144165186, Iran; (S.R.D.); (S.M.E.M.)
| | - Germán Ortuño-Hernández
- Fruit Breeding Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain; (G.O.-H.); (J.A.S.)
| | - Cristian Pérez-Caselles
- Fruit Biotechnology Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain (C.P.-C.); (N.A.)
| | - Sayyed Mohammad Ehsan Mahdavi
- Department of Horticultural Science, College of Agriculture, Shiraz University, Shiraz 7144165186, Iran; (S.R.D.); (S.M.E.M.)
| | - Geza Bujdoso
- Research Centre for Fruit Growing, Hungarian University of Agriculture and Life Sciences, 1223 Budapest, Hungary;
| | - Juan Alfonso Salazar
- Fruit Breeding Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain; (G.O.-H.); (J.A.S.)
| | - Pedro Martínez-Gómez
- Fruit Breeding Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain; (G.O.-H.); (J.A.S.)
| | - Nuria Alburquerque
- Fruit Biotechnology Group, Department of Plant Breeding, CEBAS-CSIC (Centro de Edafología y Biología Aplicada del Segura-Consejo Superior de Investigaciones Científicas), Campus Universitario Espinardo, E-30100 Murcia, Spain (C.P.-C.); (N.A.)
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Rehman S, Bahadur S, Xia W. An overview of floral regulatory genes in annual and perennial plants. Gene 2023; 885:147699. [PMID: 37567454 DOI: 10.1016/j.gene.2023.147699] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/31/2023] [Accepted: 08/08/2023] [Indexed: 08/13/2023]
Abstract
The floral initiation in angiosperms is a complex process influenced by endogenous and exogenous signals. With this approach, we aim to provide a comprehensive review to integrate this complex floral regulatory process and summarize the regulatory genes and their functions in annuals and perennials. Seven primary paths leading to flowering have been discovered in Arabidopsis under several growth condition that include; photoperiod, ambient temperature, vernalization, gibberellins, autonomous, aging and carbohydrates. These pathways involve a series of interlinked signaling pathways that respond to both internal and external signals, such as light, temperature, hormones, and developmental cues, to coordinate the expression of genes that are involved in flower development. Among them, the photoperiodic pathway was the most important and conserved as some of the fundamental loci and mechanisms are shared even by closely related plant species. The activation of floral regulatory genes such as FLC, FT, LFY, and SOC1 that determine floral meristem identity and the transition to the flowering stage result from the merging of these pathways. Recent studies confirmed that alternative splicing, antisense RNA and epigenetic modification play crucial roles by regulating the expression of genes related to blooming. In this review, we documented recent progress in the floral transition time in annuals and perennials, with emphasis on the specific regulatory mechanisms along with the application of various molecular approaches including overexpression studies, RNA interference and Virus-induced flowering. Furthermore, the similarities and differences between annual and perennial flowering will aid significant contributions to the field by elucidating the mechanisms of perennial plant development and floral initiation regulation.
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Affiliation(s)
- Shazia Rehman
- Sanya Nanfan Research Institution, Hainan University, Haikou 572025, China; College of Tropical Crops, Hainan University, Haikou 570228, China
| | - Saraj Bahadur
- College of Forestry, Hainan University, Haikou 570228 China
| | - Wei Xia
- Sanya Nanfan Research Institution, Hainan University, Haikou 572025, China; College of Tropical Crops, Hainan University, Haikou 570228, China.
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Basu U, Parida SK. Restructuring plant types for developing tailor-made crops. PLANT BIOTECHNOLOGY JOURNAL 2023; 21:1106-1122. [PMID: 34260135 DOI: 10.1111/pbi.13666] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/08/2021] [Accepted: 07/12/2021] [Indexed: 05/27/2023]
Abstract
Plants have adapted to different environmental niches by fine-tuning the developmental factors working together to regulate traits. Variations in the developmental factors result in a wide range of quantitative variations in these traits that helped plants survive better. The major developmental pathways affecting plant architecture are also under the control of such pathways. Most notable are the CLAVATA-WUSCHEL pathway regulating shoot apical meristem fate, GID1-DELLA module influencing plant height and tillering, LAZY1-TAC1 module controlling branch/tiller angle and the TFL1-FT determining the floral fate in plants. Allelic variants of these key regulators selected during domestication shaped the crops the way we know them today. There is immense yield potential in the 'ideal plant architecture' of a crop. With the available genome-editing techniques, possibilities are not restricted to naturally occurring variations. Using a transient reprogramming system, one can screen the effect of several developmental gene expressions in novel ecosystems to identify the best targets. We can use the plant's fine-tuning mechanism for customizing crops to specific environments. The process of crop domestication can be accelerated with a proper understanding of these developmental pathways. It is time to step forward towards the next-generation molecular breeding for restructuring plant types in crops ensuring yield stability.
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Affiliation(s)
- Udita Basu
- Genomics-Assisted Breeding and Crop Improvement Laboratory, National Institute of Plant Genome Research (NIPGR), New Delhi, India
| | - Swarup K Parida
- Genomics-Assisted Breeding and Crop Improvement Laboratory, National Institute of Plant Genome Research (NIPGR), New Delhi, India
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Zhou H, Zeng RF, Liu TJ, Ai XY, Ren MK, Zhou JJ, Hu CG, Zhang JZ. Drought and low temperature-induced NF-YA1 activates FT expression to promote citrus flowering. PLANT, CELL & ENVIRONMENT 2022; 45:3505-3522. [PMID: 36117312 DOI: 10.1111/pce.14442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 06/16/2022] [Accepted: 06/20/2022] [Indexed: 06/15/2023]
Abstract
Flower induction in adult citrus is mainly regulated by drought and low temperatures. However, the mechanism of FLOWERING LOCUS T regulation of citrus flowering (CiFT) under two flower-inductive stimuli remains largely unclear. In this study, a citrus transcription factor, nuclear factor YA (CiNF-YA1), was found to specifically bind to the CiFT promoter by forming a complex with CiNF-YB2 and CiNF-YC2 to activate CiFT expression. CiNF-YA1 was induced in juvenile citrus by low temperature and drought treatments. Overexpression of CiNF-YA1 increased drought susceptibility in transgenic citrus, whereas suppression of CiNF-YA1 enhanced drought tolerance in silenced citrus plants. Furthermore, a GOLDEN2 - LIKE protein (CiFE) that interacts with CiFT protein was also isolated. Further experimental evidence showed that CiFE binds to the citrus LEAFY (CiLFY) promoter and activates its expression. In addition, the expressions of CiNF-YA1 and CiFE showed a seasonal increase during the floral induction period and were induced by artificial drought and low-temperature treatments at which floral induction occurred. These results indicate that CiNF-YA1 may activate CiFT expression in response to drought and low temperatures by binding to the CiFT promoter. CiFT then forms a complex with CiFE to activate CiLFY, thereby promoting the flowering of adult citrus.
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Affiliation(s)
- Huan Zhou
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Ren-Fang Zeng
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Tian-Jia Liu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Xiao-Yan Ai
- Institute of Pomology and Tea, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Meng-Ke Ren
- College of Life Science and Technology, Huazhong Agricultural University, Wuhan, China
| | - Jing-Jing Zhou
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Chun-Gen Hu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
| | - Jin-Zhi Zhang
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, China
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Gafni I, Rai AC, Halon E, Zviran T, Sisai I, Samach A, Irihimovitch V. Expression Profiling of Four Mango FT/TFL1-Encoding Genes under Different Fruit Load Conditions, and Their Involvement in Flowering Regulation. PLANTS 2022; 11:plants11182409. [PMID: 36145810 PMCID: PMC9506463 DOI: 10.3390/plants11182409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/05/2022] [Accepted: 09/14/2022] [Indexed: 11/16/2022]
Abstract
Plant flowering is antagonistically modulated by similar FLOWERING LOCUS T (FT) and TERMINAL FLOWER 1 (TFL1) proteins. In mango (Mangifera indica L.), flowering is induced by cold temperatures, unless the tree is juvenile or the adult tree had a high fruit load (HFL) in the summer. Here, we studied the effects of juvenility and fruit load on the expression of four MiFT/TFL1 genes cloned from the mango ‘Shelly’ cultivar. Ectopic expression of MiFT1 in Arabidopsis resulted in early flowering, whereas over-expression of MiFT2 and the two cloned MiTFL1 genes repressed flowering. Moreover, juvenility was positively correlated with higher transcript levels of MiFT2 and both MiTFL1s. In trees with a low fruit load, leaf MiFT1 expression increased in winter, whereas HFL delayed its upregulation. MiFT2 expression was upregulated in both leaves and buds under both fruit load conditions. Downregulation of both MITFL1s in buds was associated with a decrease in regional temperatures under both conditions; nevertheless, HFL delayed the decrease in their accumulation. Our results suggest that cold temperature has opposite effects on the expression of MiFT1 and the MiTFL1s, thereby inducing flowering, whereas HFL represses flowering by both suppressing MiFT1 upregulation and delaying MiTFL1s downregulation. The apparent flowering-inhibitory functions of MiFT2 are discussed.
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Affiliation(s)
- Itamar Gafni
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Avinash Chandra Rai
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
| | - Eyal Halon
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
| | - Tali Zviran
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
| | - Isaac Sisai
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
| | - Alon Samach
- The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Vered Irihimovitch
- Institute of Plant Sciences, Agricultural Research Organization (ARO), The Volcani Center, Rishon LeZion 7528809, Israel
- Correspondence: ; Tel.: +972-3-9683965; Fax: +972-3-9669583
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Agustí M, Reig C, Martínez-Fuentes A, Mesejo C. Advances in Citrus Flowering: A Review. FRONTIERS IN PLANT SCIENCE 2022; 13:868831. [PMID: 35463419 PMCID: PMC9024417 DOI: 10.3389/fpls.2022.868831] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 03/07/2022] [Indexed: 05/29/2023]
Abstract
Citrus are polycarpic and evergreen species that flower once in spring or several times a year depending on the genotype and the climatic conditions. Floral induction is triggered by low temperature and water-deficit stress and occurs 2-3 months before bud sprouting, whereas differentiation takes place at the same time as sprouting. The induced buds develop single flowers or determinate inflorescences, so that vegetative growth is required at the axillary buds to renew the polycarpic habit. The presence of fruits inhibits sprouting and flower induction from nearby axillary buds in the current season. In some species and cultivars, this results in low flowering intensity the following spring, thus giving rise to alternate bearing. A number of key flowering genes act in the leaf (CiFT3, CcMADS19, etc.) or in the bud (CsLFY, CsTFL1, etc.) to promote or inhibit both flowering time and reproductive meristem identity in response to these climatic factors, the fruit dominance, or the age of the plant (juvenility). The expression of some of these genes can be modified by gibberellin treatments, which reduce bud sprouting and flowering in adult trees, and constitute the main horticultural technique to control flowering in citrus. This review presents a comprehensive view of all aspects of the flowering process in citrus, converging the research published during the past half century, which focused on plant growth regulators and the nutritional source-sink relationships and guided research toward the study of gene transcription and plant transformation, and the advances made with the development of the tools of molecular biology published during the current century.
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Wang YH, He XH, Yu HX, Mo X, Fan Y, Fan ZY, Xie XJ, Liu Y, Luo C. Overexpression of four MiTFL1 genes from mango delays the flowering time in transgenic Arabidopsis. BMC PLANT BIOLOGY 2021; 21:407. [PMID: 34493220 PMCID: PMC8422776 DOI: 10.1186/s12870-021-03199-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 08/31/2021] [Indexed: 05/13/2023]
Abstract
BACKGROUND TERMINAL FLOWER 1 (TFL1) belongs to the phosphatidylethanolamine-binding protein (PEBP) family, which is involved in inflorescence meristem development and represses flowering in several plant species. In the present study, four TFL1 genes were cloned from the mango (Mangifera indica L.) variety 'SiJiMi' and named MiTFL1-1, MiTFL1-2, MiTFL1-3 and MiTFL1-4. RESULTS Sequence analysis showed that the encoded MiTFL1 proteins contained a conserved PEBP domain and belonged to the TFL1 group. Expression analysis showed that the MiTFL1 genes were expressed in not only vegetative organs but also reproductive organs and that the expression levels were related to floral development. Overexpression of the four MiTFL1 genes delayed flowering in transgenic Arabidopsis. Additionally, MiTFL1-1 and MiTFL1-3 changed the flower morphology in some transgenic plants. Yeast two-hybrid (Y2H) analysis showed that several stress-related proteins interacted with MiTFL1 proteins. CONCLUSIONS The four MiTFL1 genes exhibited a similar expression pattern, and overexpression in Arabidopsis resulted in delayed flowering. Additionally, MiTFL1-1 and MiTFL1-3 overexpression affected floral organ development. Furthermore, the MiTFL1 proteins could interact with bHLH and 14-3-3 proteins. These results indicate that the MiTFL1 genes may play an important role in the flowering process in mango.
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Affiliation(s)
- Yi-Han Wang
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Xin-Hua He
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Hai-Xia Yu
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Xiao Mo
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Yan Fan
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Zhi-Yi Fan
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Xiao-Jie Xie
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Yuan Liu
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China
| | - Cong Luo
- College of Agriculture, State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning, 530004, Guangxi, China.
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Orbović V, Ravanfar SA, Acanda Y, Narvaez J, Merritt BA, Levy A, Lovatt CJ. Stress-inducible Arabidopsis thaliana RD29A promoter constitutively drives Citrus sinensis APETALA1 and LEAFY expression and precocious flowering in transgenic Citrus spp. Transgenic Res 2021; 30:687-699. [PMID: 34053006 DOI: 10.1007/s11248-021-00260-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 05/17/2021] [Indexed: 11/28/2022]
Abstract
Transgenic 'Duncan' grapefruit (Citrus paradisi Macf.) and 'Valencia' sweet orange (Citrus sinensis [L.] Osbeck) plants ectopically expressing C. sinensis (cv. Washington navel orange) APETALA1 (CsAP1) or LEAFY (CsLFY) genes under control of the Arabidopsis thaliana stress-inducible promoter AtRD29A flowered under non-inductive (warm temperature, well-watered) greenhouse conditions, whereas their wild-type (WT) counterparts did not. The transgenic plants that flowered exhibited no altered morphological features, except the lack of thorns characteristic of juvenile WT plants. The most precocious T0 line, 'Duncan' grapefruit (Dun134-3) expressing the CsAP1 gene, flowered and fruited when it was 4.5 years old and the T1 siblings from this line flowered and fruited when they were just over 18 months old. In contrast, T1 seedlings from three lines of 'Duncan' grapefruit expressing the CsLFY gene flowered within 3 months after germination, but were unable to support fruit development. Transcript levels of corresponding transgenes in leaves were not correlated with earliness of flowering. To further study the activity of AtRD29A, leaves from three 'Carrizo' citrange (C. sinensis × Poncirus trifoliata) rootstock seedlings transformed with the green fluorescent protein (GFP) gene under regulation of the AtRD29A promoter were subjected to drought stress or well-watered conditions. Expression of GFP was not stress-dependent, consistent with the observation of flowering of CsAP1 and CsLFY transgenic plants under non-inductive conditions. Taken together, the results suggest that AtRD29A is constitutively expressed in a citrus background. Despite the loss of control over flowering time, transgenic citrus lines ectopically expressing C. sinensis AP1 or LFY genes under control of the A. thaliana RD29A promoter exhibit precocious flowering, fruit development and viable transgenic seed formation. These transformed lines can be useful tools to reduce the time between generations to accelerate breeding.
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Affiliation(s)
- Vladimir Orbović
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, 33850, USA.
| | - Seyed Ali Ravanfar
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, 33850, USA
| | - Yosvanis Acanda
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, 33850, USA
| | - Javier Narvaez
- Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521, USA
| | - Benjamin A Merritt
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, 33850, USA
| | - Amit Levy
- Citrus Research and Education Center, University of Florida/IFAS, Lake Alfred, FL, 33850, USA
| | - Carol J Lovatt
- Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521, USA
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11
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Zhang F, Wang Y, Irish VF. CENTRORADIALIS maintains shoot meristem indeterminacy by antagonizing THORN IDENTITY1 in Citrus. Curr Biol 2021; 31:2237-2242.e4. [PMID: 33761317 DOI: 10.1016/j.cub.2021.02.051] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/12/2021] [Accepted: 02/19/2021] [Indexed: 11/29/2022]
Abstract
Differential regulation of stem cell activity in shoot meristems contributes to the wide variation in shoot architecture.1-3 In most Citrus species, a thorn meristem and a dormant axillary meristem co-localize at each leaf base, offset from each other in a spiral phyllotactic pattern. We recently identified THORN IDENTITY1 (TI1) and THORN IDENTITY2 (TI2), encoding TEOSINTE BRANCHED1/CYCLOIDEA/PCF (TCP) transcription factors, as necessary for the termination of meristem proliferation and concomitant thorn production in Citrus.4 However, how the dormant axillary meristem at the same leaf axil maintains stem cell activity is still unknown. The phosphatidylethanolamine-binding protein (PEBP)-type transcription factors CENTRORADIALIS (CEN) and TERMINAL FLOWER1 (TFL1) maintain inflorescence meristem indeterminacy in many plant species by antagonizing floral meristem identity regulators.5-9 Here, we show that, in Citrus, Citrus CEN (CsCEN) maintains vegetative axillary meristem indeterminacy by antagonizing TI1. CsCEN is expressed in the axillary meristem, but not in the thorn meristem. Disruption of CsCEN function results in termination of the stem cell activity and conversion of dormant axillary meristems into thorns, although ectopic overexpression of CsCEN represses TI1 expression and converts thorns into dormant buds, a phenotype similar to the ti1 mutant. We further show that CsCEN interacts with Citrus FD (CsFD) to repress TI1 expression. CsCEN activity depends on the function of TI1 and TI2, as mutations in TI1 and TI2 rescue the cscen mutant phenotype. We suggest that the antagonistic roles of CsCEN and TI1 define the pattern of axillary meristem determinacy, which shapes vegetative Citrus tree shoot architecture.
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Affiliation(s)
- Fei Zhang
- Department of Molecular, Cellular and Developmental Biology, Yale University, 260 Whitney Avenue, New Haven, CT 06520, USA
| | - Yewei Wang
- Department of Molecular, Cellular and Developmental Biology, Yale University, 260 Whitney Avenue, New Haven, CT 06520, USA
| | - Vivian F Irish
- Department of Molecular, Cellular and Developmental Biology, Yale University, 260 Whitney Avenue, New Haven, CT 06520, USA; Department of Ecology and Evolutionary Biology, Yale University, 165 Prospect Street, New Haven, CT 06520, USA.
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12
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Leichty AR, Sinha NR. Plant development: How competing modes of growth coexist in close proximity. Curr Biol 2021; 31:R472-R474. [PMID: 34033767 DOI: 10.1016/j.cub.2021.03.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2022]
Abstract
A new study in Citrus reveals how CENTRORADIALIS prevents axillary buds from terminating as thorns by directly inhibiting THORN IDENTITY1, thereby maintaining coexisting states of determinate and indeterminate growth at vegetative nodes.
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Affiliation(s)
- Aaron R Leichty
- Department of Plant Biology, University of California at Davis, Davis, CA 95616, USA.
| | - Neelima R Sinha
- Department of Plant Biology, University of California at Davis, Davis, CA 95616, USA
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13
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Kaldate S, Patel A, Modha K, Parekh V, Kale B, Vadodariya G, Patel R. Allelic characterization and protein structure analysis reveals the involvement of splice site mutation for growth habit differences in Lablab purpureus (L.) Sweet. J Genet Eng Biotechnol 2021; 19:34. [PMID: 33619637 PMCID: PMC7900342 DOI: 10.1186/s43141-021-00136-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 02/14/2021] [Indexed: 11/10/2022]
Abstract
BACKGROUND Interrelationship between growth habit and flowering played a key role in the domestication history of pulses; however, the actual genes responsible for these traits have not been identified in Indian bean. Determinate growth habit is desirable due to its early flowering, photo-insensitivity, synchronous pod maturity, ease in manual harvesting and short crop duration. The present study aimed to identify, characterize and validate the gene responsible for growth habit by using a candidate gene approach coupled with sequencing, multiple sequence alignment, protein structure prediction and binding pocket analysis. RESULTS Terminal flowering locus was amplified from GPKH 120 (indeterminate) and GNIB-21 (determinate) using the primers designed from PvTFL1y locus of common bean. Gene prediction revealed that the length of the third and fourth exons differed between the two alleles. Allelic sequence comparison indicated a transition from guanine to adenine at the end of the third exon in GNIB 21. This splice site single-nucleotide polymorphism (SNP) was validated in germplasm lines by sequencing. Protein structure analysis indicated involvement of two binding pockets for interaction of terminal flowering locus (TFL) protein with other proteins. CONCLUSION The splice site SNP present at the end of the third exon of TFL locus is responsible for the transformation of shoot apical meristem into a reproductive fate in the determinate genotype GNIB 21. The splice site SNP leads to absence of 14 amino acids in mutant TFL protein of GNIB 21, rendering the protein non-functional. This deletion disturbed previously reported anion-binding pocket and secondary binding pocket due to displacement of small β-sheet away from an external loop. This finding may enable the modulation of growth habit in Indian bean and other pulse crops through genome editing.
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Affiliation(s)
- Supriya Kaldate
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India
| | - Apexa Patel
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India
| | - Kaushal Modha
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India.
| | - Vipulkumar Parekh
- Department of Basic Science and Humanities, ASPEE College of Horticulture and Forestry, NAU, Navsari, Gujarat, 396 450, India
| | - Bhushan Kale
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India
| | - Gopal Vadodariya
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India
| | - Ritesh Patel
- Department of Genetics and Plant Breeding, N. M. College of Agriculture, Navsari Agricultural University, Navsari, Gujarat, 396 450, India
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14
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Haider S, Gao Y, Gao Y. Standardized Genetic Transformation Protocol for Chrysanthemum cv. 'Jinba' with TERMINAL FLOWER 1 Homolog CmTFL1a. Genes (Basel) 2020; 11:genes11080860. [PMID: 32731555 PMCID: PMC7463584 DOI: 10.3390/genes11080860] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 07/19/2020] [Accepted: 07/22/2020] [Indexed: 01/07/2023] Open
Abstract
Chrysanthemum (Chrysanthemum x morifolium Ramat.) cultivar Jinba is a distinctive short-day chrysanthemum that can be exploited as a model organism for studying the molecular mechanism of flowering. The commercial value of Jinba can be increased in global flower markets by developing its proper regeneration and genetic transformation system. By addressing typical problems associated with Agrobacterium-mediated transformation in chrysanthemum, that is, low transformation efficiency and high cultivar specificity, we designed an efficient, stable transformation system. Here, we identify the features that significantly affect the genetic transformation of Jinba and standardize its transformation protocol by using CmTFL1a as a transgene. The appropriate concentrations of various antibiotics (kanamycin, meropenem and carbenicillin) and growth regulators (6-BA, 2,4-D and NAA) for the genetic transformation were determined to check their effects on in vitro plant regeneration from leaf segments of Jinba; thus, the transformation protocol was standardized through Agrobacterium tumefaciens (EHA105). In addition, the presence of the transgene and its stable expression in CmTFL1a transgenic plants were confirmed by polymerase chain reaction (PCR) analysis. The CmTFL1a transgene constitutively expressed in the transgenic plants was highly expressed in shoot apices as compared to stem and leaves. Overexpression of CmTFL1a led to a delay in transition to the reproductive phase and significantly affected plant morphology. This study will help to understand the biological phenomenon of TFL1 homolog in chrysanthemum. Moreover, our findings can explore innovative possibilities for genetic engineering and breeding of other chrysanthemum cultivars.
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Affiliation(s)
- Saba Haider
- National Flower Engineering Research Centre, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Landscape Architecture of Beijing Forestry University, Beijing 100083, China;
| | - Yaohui Gao
- Architectural Institute, Inner Mongolia University of Science & Technology, Alding Street No.7, Kundulun District, Baotou 014010, China;
| | - Yike Gao
- National Flower Engineering Research Centre, Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, College of Landscape Architecture of Beijing Forestry University, Beijing 100083, China;
- Correspondence: ; Tel.: +86-138-0102-1804
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15
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Endo T, Fujii H, Omura M, Shimada T. Fast-track breeding system to introduce CTV resistance of trifoliate orange into citrus germplasm, by integrating early flowering transgenic plants with marker-assisted selection. BMC PLANT BIOLOGY 2020; 20:224. [PMID: 32429838 PMCID: PMC7238647 DOI: 10.1186/s12870-020-02399-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 04/15/2020] [Indexed: 05/26/2023]
Abstract
BACKGROUND Global warming will expand the range of new and invasive pathogens in orchards, and subsequently increase the risk of disease epidemics and economic losses. The development of new resistant plant varieties can help to reduce the impact of pathogens, however, the breeding speed can be extremely slow, due to the growth rates of the plants, and the availability of resistance genes. Citrus trees are suffering immense damage from serious diseases such as citrus canker (XCC), huanglongbing (HLB), and citrus tristeza virus (CTV). A fast-track breeding system, that aimed at shortening the duration for disease resistance breeding by incorporating the resistance genes from related species to commercial varieties, has been developed using the integration of precocious transgenic trifoliate orange with the overexpression of CiFT and MAS. It was applied here to incorporate CTV resistance of trifoliate orange into citrus germplasm. RESULTS One generation of backcrossed breeding, that would normally take at least 5 years, was achieved in a single year by fast-track breeding system. Linkage analysis using the corresponding DNA markers revealed that CTV resistance and T-DNA integrated regions were found in different linkage groups, and they were independently segregated in the BC progenies. The CTV resistant null segregants, in which the T-DNA integrated region was removed from their genome, were feasibly obtained by MAS in each generation of the BC progenies, and their CTV resistance was confirmed by immunological analysis. Several BC3 null segregants, whose genetic backgrounds had been substituted into citrus germplasm, except for the haplotype block of CTV resistance, were successfully obtained. CGH and NGS analyses revealed that the T-DNA integrated region was safely segregated out in null segregants. CONCLUSION Fast-track breeding systems are expected to shorten the required breeding time by more than one-fifth in comparison with conventional cross breeding techniques. Using this system, we obtained BC3-8, whose genetic background was successfully substituted except for the CTV resistance locus, and could be a novel mandarin breeding material. The fast-track breeding system will be useful to introduce important traits from related species to citrus germplasm while also drastically reducing the time required for breeding.
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Affiliation(s)
- Tomoko Endo
- National Agriculture and Food Research Organization, Institute of Fruit and Tea Tree Science (NIFTS), Shizuoka, Shimizu 424-0292 Japan
| | - Hiroshi Fujii
- National Agriculture and Food Research Organization, Institute of Fruit and Tea Tree Science (NIFTS), Shizuoka, Shimizu 424-0292 Japan
| | - Mitsuo Omura
- Faculty of Agriculture, Shizuoka University, Shizuoka, Suruga 422-8529 Japan
| | - Takehiko Shimada
- National Agriculture and Food Research Organization, Institute of Fruit and Tea Tree Science (NIFTS), Shizuoka, Shimizu 424-0292 Japan
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16
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Salonia F, Ciacciulli A, Poles L, Pappalardo HD, La Malfa S, Licciardello C. New Plant Breeding Techniques in Citrus for the Improvement of Important Agronomic Traits. A Review. FRONTIERS IN PLANT SCIENCE 2020; 11:1234. [PMID: 32922420 PMCID: PMC7456868 DOI: 10.3389/fpls.2020.01234] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 07/28/2020] [Indexed: 05/18/2023]
Abstract
New plant breeding techniques (NPBTs) aim to overcome traditional breeding limits for fruit tree species, in order to obtain new varieties with improved organoleptic traits and resistance to biotic and abiotic stress, and to maintain fruit quality achieved over centuries by (clonal) selection. Knowledge on the gene(s) controlling a specific trait is essential for the use of NPBTs, such as genome editing and cisgenesis. In the framework of the international scientific community working on fruit tree species, including citrus, NPBTs have mainly been applied to address pathogen threats. Citrus could take advantage of NPBTs because of its complex species biology (seedlessness, apomixis, high heterozygosity, and long juvenility phase) and aptitude for in vitro manipulation. To our knowledge, genome editing in citrus via transgenesis has successful for induced resistance to Citrus bacterial canker in sweet orange and grapefruit using the resistance gene CsLOB1. In the future, NPBTs will also be used to improve fruit traits, making them healthier. The regeneration of plants following the application of NPBTs is a bottleneck, making it necessary to optimize the efficiency of current protocols. The strengths and weaknesses of using explants from young in vitro plantlets, and from mature plants, will be discussed. Other major issues addressed in this review are related to the requirement for marker-free systems and shortening the long juvenility phase. This review aims to summarize methods and approaches available in the literature that are suitable to citrus, focusing on the principles observed before the use of NPBTs.
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Affiliation(s)
- Fabrizio Salonia
- CREA - Research Centre for Olive, Fruit and Citrus Crops, Acireale, Italy
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Catania, Italy
| | - Angelo Ciacciulli
- CREA - Research Centre for Olive, Fruit and Citrus Crops, Acireale, Italy
| | - Lara Poles
- CREA - Research Centre for Olive, Fruit and Citrus Crops, Acireale, Italy
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Catania, Italy
| | | | - Stefano La Malfa
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Catania, Italy
- *Correspondence: Stefano La Malfa, ; Concetta Licciardello,
| | - Concetta Licciardello
- CREA - Research Centre for Olive, Fruit and Citrus Crops, Acireale, Italy
- *Correspondence: Stefano La Malfa, ; Concetta Licciardello,
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Erpen-Dalla Corte L, M. Mahmoud L, S. Moraes T, Mou Z, W. Grosser J, Dutt M. Development of Improved Fruit, Vegetable, and Ornamental Crops Using the CRISPR/Cas9 Genome Editing Technique. PLANTS (BASEL, SWITZERLAND) 2019; 8:E601. [PMID: 31847196 PMCID: PMC6963220 DOI: 10.3390/plants8120601] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 12/06/2019] [Accepted: 12/11/2019] [Indexed: 02/06/2023]
Abstract
Horticultural crops, including fruit, vegetable, and ornamental plants are an important component of the agriculture production systems and play an important role in sustaining human life. With a steady growth in the world's population and the consequent need for more food, sustainable and increased fruit and vegetable crop production is a major challenge to guarantee future food security. Although conventional breeding techniques have significantly contributed to the development of important varieties, new approaches are required to further improve horticultural crop production. Clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated protein 9 (Cas9) has emerged as a valuable genome-editing tool able to change DNA sequences at precisely chosen loci. The CRISPR/Cas9 system was developed based on the bacterial adaptive immune system and comprises of an endonuclease guided by one or more single-guide RNAs to generate double-strand breaks. These breaks can then be repaired by the natural cellular repair mechanisms, during which genetic mutations are introduced. In a short time, the CRISPR/Cas9 system has become a popular genome-editing technique, with numerous examples of gene mutation and transcriptional regulation control in both model and crop plants. In this review, various aspects of the CRISPR/Cas9 system are explored, including a general presentation of the function of the CRISPR/Cas9 system in bacteria and its practical application as a biotechnological tool for editing plant genomes, particularly in horticultural crops.
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Affiliation(s)
| | - Lamiaa M. Mahmoud
- Pomology Department, Faculty of Agriculture, Mansoura University, 35516 Mansoura, Egypt;
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, USA;
| | - Tatiana S. Moraes
- Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba 13416-000, SP, Brazil;
| | - Zhonglin Mou
- Department of Microbiology and Cell Sciences, University of Florida, Gainesville, FL 32603, USA;
| | - Jude W. Grosser
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, USA;
| | - Manjul Dutt
- Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, USA;
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18
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Bi Z, Tahir AT, Huang H, Hua Y. Cloning and functional analysis of five TERMINAL FLOWER 1/CENTRORADIALIS-like genes from Hevea brasiliensis. PHYSIOLOGIA PLANTARUM 2019; 166:612-627. [PMID: 30069883 DOI: 10.1111/ppl.12808] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/12/2018] [Accepted: 07/17/2018] [Indexed: 05/14/2023]
Abstract
Five TERMINAL FLOWER 1 (TFL1)/CENTRORADIALIS (CEN)-like genes were isolated and characterized from rubber tree (Hevea brasiliensis). All genes, except HbCEN1, were found to have conserved genomic organization, characteristic of the phosphatidyl ethanolamine-binding protein (PEBP) family. Overexpression of all of them delayed flowering and altered flower architecture compared with the wild-type (wt) counterpart. In addition, as premature-flowering of the terminal bud was successfully overcome in the tfl1-1 mutant of Arabidopsis, all these genes have a potential function similar to TFL1. Quantitative reverse transcriptase-polymerase chain reaction analysis showed higher expressions of HbCEN1 and HbCEN2 in the shoot apices and stems of both immature and mature rubber trees than in reproductive organs. HbTFL1-1 and HbTFL1-2 expression was confined to roots of 3-month-old seedlings and HbTFL1-3 was significantly higher in the shoot apices of these seedlings. These results suggested that HbCEN1 and HbCEN2 could be associated with the development of vegetative growth, whereas HbTFL1-1, HbTFL1-2 and HbTFL1-3 seem to be mainly related with maintenance of juvenility. In addition, four of the five genes displayed variable diurnal expression, HbTFL1-1 and HbTFL1-3 being mainly expressed during the night whereas HbCEN1 and HbCEN2 showed irregular diurnal rhythms.
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Affiliation(s)
- Zhenghong Bi
- Key Laboratory of Rubber Biology of the Ministry of Agriculture, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China
| | - Ayesha T Tahir
- Department of Biosciences, COMSATS University, Islamabad, Pakistan
| | - Huasun Huang
- Key Laboratory of Rubber Biology of the Ministry of Agriculture, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China
| | - Yuwei Hua
- Key Laboratory of Rubber Biology of the Ministry of Agriculture, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou, 571737, China
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Périlleux C, Bouché F, Randoux M, Orman-Ligeza B. Turning Meristems into Fortresses. TRENDS IN PLANT SCIENCE 2019; 24:431-442. [PMID: 30853243 DOI: 10.1016/j.tplants.2019.02.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 01/25/2019] [Accepted: 02/04/2019] [Indexed: 05/18/2023]
Abstract
TERMINAL FLOWER1 (TFL1) was named from knockout Arabidopsis thaliana mutants in which the inflorescence abnormally terminates into a flower. In wild type plants, the expression of TFL1 in the center of the inflorescence meristem represses the flower meristem identity genes LEAFY (LFY) and APETALA1 (AP1) to maintain indeterminacy. LFY and AP1 are activated by flowering signals that antagonize TFL1. Its characterization in numerous species revealed that the TFL1-mediated regulation of meristem fate has broader impacts on plant development than originally depicted in A. thaliana. By blocking floral transition, TFL1 genes participate in the control of juvenility, shoot growth pattern, inflorescence architecture, and the establishment of life history strategies. Here, we contextualize the role of the TFL1-mediated protection of meristem indeterminacy throughout plant development.
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Affiliation(s)
| | | | - Marie Randoux
- University of Liège, InBioS-PhytoSYSTEMS, Liège, Belgium
| | - Beata Orman-Ligeza
- University of Liège, InBioS-PhytoSYSTEMS, Liège, Belgium; Current address: National Institute of Agricultural Botany, Cambridge, UK
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20
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Gao Y, Gao Y, Wu Z, Bu X, Fan M, Zhang Q. Characterization of TEMINAL FLOWER1 homologs CmTFL1c gene from Chrysanthemum morifolium. PLANT MOLECULAR BIOLOGY 2019; 99:587-601. [PMID: 30762161 DOI: 10.1007/s11103-019-00838-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 02/05/2019] [Indexed: 05/21/2023]
Abstract
The CmTFL1c gene of Chrysanthemum morifolium inhibits flowering, regulates inflorescence architecture and floral development. The timing of flowering is an important ornamental trait of chrysanthemum. The gene TERMINAL FLOWER1 (TFL1) has been shown to be involved in the regulation of meristem fate and flowering time regulation. Here, a TFL1 gene named as CmTFL1c, was cloned from Chrysanthemum morifolium and further characterized. The open reading frame of CmTFL1c comprises 522 bp, which encodes a polypeptide of 173 amino acids. Phylogenetic analysis revealed that CmTFL1c belongs to the CEN/TFL1 clade. CmTFL1c protein localizes to the nucleus as well as to plasma membrane, which suggests that CmTFL1c may be a transcription factor. The CmTFL1c gene was most highly expressed in vegetative stems, and weakly expressed in leaves and flower buds; both shoot apices and stems had sensitivity to photoperiod. Overexpression of CmTFL1c in wild Arabidopsis and tfl1-13 mutant led to late flowering and altered architecture, including increased secondary branching, and abnormal inflorescences and flowers. The CmTFL1c gene negatively regulated flowering by inhibiting the up-regulation of the AtFT, AtLFY and AtAP1. The biological function of CmTFL1c was further characterized in C. morifolium via Agrobacterium-mediated transformation, which showed that CmTFL1c not only delayed flowering and promoted axillary bud formation, but also played an important role in inflorescence formation of chrysanthemum. These results showed that the CmTFL1c affects flowering time and regulates inflorescence architecture.
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Affiliation(s)
- Yaohui Gao
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China
| | - Yike Gao
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China.
| | - Zhiping Wu
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China
| | - Xianglong Bu
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China
| | - Min Fan
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China
| | - Qixiang Zhang
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, College of ornamental horticulture and landscape architecture, Beijing Forestry University, Beijing, 100083, China
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Muñoz-Fambuena N, Nicolás-Almansa M, Martínez-Fuentes A, Reig C, Iglesias DJ, Primo-Millo E, Mesejo C, Agustí M. Genetic inhibition of flowering differs between juvenile and adult Citrus trees. ANNALS OF BOTANY 2019; 123:483-490. [PMID: 30289429 PMCID: PMC6377094 DOI: 10.1093/aob/mcy179] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Accepted: 09/02/2018] [Indexed: 06/01/2023]
Abstract
BACKGROUND AND AIMS In woody species, the juvenile period maintains the axillary meristems in a vegetative stage, unable to flower, for several years. However, in adult trees, some 1-year-old meristems flower whereas others remain vegetative to ensure a polycarpic growth habit. Both types of trees, therefore, have non-flowering meristems, and we hypothesize that the molecular mechanism regulating flower inhibition in juvenile trees is different from that in adult trees. METHODS In adult Citrus trees, the main endogenous factor inhibiting flower induction is the growing fruit. Thus, we studied the expression of the main flowering time, identity and patterning genes of trees with heavy fruit load (not-flowering adult trees) compared to that of 6-month-old trees (not-flowering juvenile trees). Adult trees without fruits (flowering trees) were used as a control. Second, we studied the expression of the same genes in the meristems of 6-month, and 1-, 3-, 5- and 7-year-old juvenile trees compared to 10-year-old flowering trees. KEY RESULTS The axillary meristems of juvenile trees are unable to transcribe flowering time and patterning genes during the period of induction, although they are able to transcribe the FLOWERING LOCUS T citrus orthologue (CiFT2) in leaves. By contrast, meristems of not-flowering adult trees are able to transcribe the flowering network genes but fail to achieve the transcription threshold required to flower, due to CiFT2 repression by the fruit. Juvenile meristems progressively achieve gene expression, with age-dependent differences from 6 months to 7 years, FD-like and CsLFY being the last genes to be expressed. CONCLUSIONS During the juvenile period the mechanism inhibiting flowering is determined in the immature bud, so that it progressively acquires flowering ability at the gene expression level of the flowering time programme, whereas in the adult tree it is determined in the leaf, where repression of CiFT2 gene expression occurs.
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Affiliation(s)
- N Muñoz-Fambuena
- Instituto Agroforestal Mediterraneo, Universitat Politècnica de València, Camino de Vera s/n, CP, Valencia, Spain
| | | | - A Martínez-Fuentes
- Instituto Agroforestal Mediterraneo, Universitat Politècnica de València, Camino de Vera s/n, CP, Valencia, Spain
| | - C Reig
- Instituto Agroforestal Mediterraneo, Universitat Politècnica de València, Camino de Vera s/n, CP, Valencia, Spain
| | - D J Iglesias
- Instituto Valenciano de Investigaciones Agrarias, crta Moncada-Náquera, km 4.5, Moncada, CP, Spain
| | - E Primo-Millo
- Instituto Valenciano de Investigaciones Agrarias, crta Moncada-Náquera, km 4.5, Moncada, CP, Spain
| | - C Mesejo
- Instituto Agroforestal Mediterraneo, Universitat Politècnica de València, Camino de Vera s/n, CP, Valencia, Spain
| | - M Agustí
- Instituto Agroforestal Mediterraneo, Universitat Politècnica de València, Camino de Vera s/n, CP, Valencia, Spain
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Huang T, Long J, Liu SW, Yang ZW, Zhu QJ, Zhao XL, Peng C. Selection and Validation of Reference Genes for mRNA Expression by Quantitative Real-Time PCR Analysis in Neolamarckia cadamba. Sci Rep 2018; 8:9311. [PMID: 29915368 PMCID: PMC6006177 DOI: 10.1038/s41598-018-27633-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Accepted: 06/07/2018] [Indexed: 12/20/2022] Open
Abstract
Neolamarckia cadamba is an economically-important fast-growing tree species in South China and Southeast Asia. As a prerequisite first step for future gene expression studies, we have identified and characterized a series of stable reference genes that can be used as controls for quantitative real time PCR (qRT-PCR) expression analysis in this study. The expression stability of 15 candidate reference genes in various tissues and mature leaves under different conditions was evaluated using four different algorithms, i.e., geNorm, NormFinder, BestKeeper and RefFinder. Our results showed that SAMDC was the most stable of the selected reference genes across the set of all samples, mature leaves at different photosynthetic cycles and under drought stress, whereas RPL10A had the most stable expression in various tissues. PGK and RPS25 were considered the most suitable reference for mature leaves at different developmental stages and under cold treatment, respectively. Additionally, the gene expression profiles of sucrose transporter 4 (NcSUT4), and 9-cis-epoxycarotenoid dioxygenase 3 (NcNCED3) were used to confirm the validity of candidate reference genes. Collectively, our study is the first report to validate the optimal reference genes for normalization under various conditions in N. cadamba and will benefit the future discovery of gene function in this species.
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Affiliation(s)
- Tian Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Jianmei Long
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Si-Wen Liu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Zi-Wei Yang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Qi-Jin Zhu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, South China Agricultural University, Guangzhou, 510642, China
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Xiao-Lan Zhao
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China
| | - Changcao Peng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, South China Agricultural University, Guangzhou, 510642, China.
- Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China.
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23
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Endo T, Shimada T, Nakata Y, Fujii H, Matsumoto H, Nakajima N, Ikoma Y, Omura M. Abscisic acid affects expression of citrus FT homologs upon floral induction by low temperature in Satsuma mandarin (Citrus unshiu Marc.). TREE PHYSIOLOGY 2018; 38:755-771. [PMID: 29182786 DOI: 10.1093/treephys/tpx145] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 10/20/2017] [Indexed: 06/07/2023]
Abstract
After a long juvenile period, citrus trees undergo seasonal flowering cycles. Under natural conditions, citrus flowering is regulated mainly by low ambient temperatures around 15-20 °C and water deficit stress. Recent studies have revealed that fluctuations in the expression of citrus homologs of FLOWERING LOCUS T (FT, encoding a flowering integrator) are correlated with their presumed role as flower-promoting signals. Previous ectopic expression analyses have demonstrated the flower-promoting function of citrus FT homologs. In this study, we examined whether abscisic acid (ABA) affects the expression of FT homologs and the flowering induced by low ambient temperatures. Application of exogenous ABA to potted Satsuma mandarin (Citrus unshiu Marc.) trees resulted in transient accumulation of citrus FT homolog transcripts. The promoter of one citrus FT homolog, CiFT3, was active in transgenic A. thaliana (Arabidopsis thaliana) and responded to exogenous and endogenous ABA. CiFT3 is preferentially expressed in shoots, and its expression was affected by flower-inductive treatments. Endogenous ABA accumulated in mandarin shoots during the floral induction period at 15 °C and under field conditions. The accumulation of ABA was correlated with the accumulation of FT homolog transcripts and flowering intensity. It was consistent with changes in the expression of genes related to ABA metabolism. The abundance of carotenoid precursors that serve as substrates for ABA biosynthesis decreased in leaves during the accumulation of ABA. Our data indicate that ABA and carotenoid precursors in leaves influence the flowering of mandarin trees induced by low temperature.
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Affiliation(s)
- Tomoko Endo
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Takehiko Shimada
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Yumi Nakata
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Hiroshi Fujii
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Hikaru Matsumoto
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Naoko Nakajima
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Yoshinori Ikoma
- Institute of Fruit Tree and Tea Science (NIFTS), National Agriculture and Food Research Organization (NARO), Shizuoka 424-0292, Japan
| | - Mitsuo Omura
- Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan
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24
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Patil HB, Chaurasia AK, Azeez A, Krishna B, Subramaniam VR, Sane AP, Sane PV. Characterization of two TERMINAL FLOWER1 homologs PgTFL1 and PgCENa from pomegranate (Punica granatum L.). TREE PHYSIOLOGY 2018; 38:772-784. [PMID: 29281116 DOI: 10.1093/treephys/tpx154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 11/04/2017] [Indexed: 05/27/2023]
Abstract
FLOWERING LOCUS T (FT) and TERMINAL FLOWER1/CENTRORADIALIS (TFL1/CEN) are the key regulators of flowering time in plants with FT promoting flowering and TFL1 repressing flowering. TFL1 also controls floral meristem identity and its maintenance. In this study we have characterized two pomegranate (Punica granatum L.) TFL1/CEN-like genes designated as PgTFL1 and PgCENa. The expression of PgTFL1 and PgCENa fluctuated through alternate pruning and flowering cycles, being highly expressed during the vegetative phase (immediately after pruning) and decreasing gradually in the months thereafter such that their lowest levels, especially for PgCENa coincided with the flowering phase. Both the genes are able to functionally suppress the Arabidopsis tfl1-14 mutant flowering defect. Their expression in Arabidopsis resulted in delayed flowering time, increased plant height and leaf number, branches and shoot buds as compared with wild type, suggesting that PgTFL1 and PgCENa are bonafide homologs of TFL1. However, both the genes show distinct expression patterns, being expressed differentially in vegetative shoot apex and floral bud samples. While PgTFL1 expression was low in vegetative shoot apex and high in flower bud, PgCENa expression showed the opposite trend. These results suggest that the two TFL1s in pomegranate may be utilized to control distinct developmental processes, namely repression of flowering by PgCENa and development and growth of the reproductive tissues by PgTFL1 via distinct temporal and developmental regulation of their expression.
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Affiliation(s)
- Hemant B Patil
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
| | - Akhilesh K Chaurasia
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
| | - Abdul Azeez
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
| | - Bal Krishna
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
| | - V R Subramaniam
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
| | - Aniruddha P Sane
- Plant Gene Expression Lab, CSIR-National Botanical Research Institute, Lucknow 226001, India
| | - Prafullachandra V Sane
- Plant Molecular Biology Lab, Jain R&D Lab, Jain Hills, Jain Irrigation Systems Limited, Jalgaon 425001, India
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25
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H. C, J. JJ, S. S, L. MP, F. C, T. S. Induction of flowering in cassava through grafting. ACTA ACUST UNITED AC 2017. [DOI: 10.5897/jpbcs2016.0617] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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26
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Li C, Fu Q, Niu L, Luo L, Chen J, Xu ZF. Three TFL1 homologues regulate floral initiation in the biofuel plant Jatropha curcas. Sci Rep 2017; 7:43090. [PMID: 28225036 PMCID: PMC5320528 DOI: 10.1038/srep43090] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 01/18/2017] [Indexed: 11/17/2022] Open
Abstract
Recent research revealed that TERMINAL FLOWER 1 (TFL1) homologues are involved in the critical developmental process of floral initiation in several plant species. In this study, the functions of three putative TFL1 homologues (JcTFL1a, JcTFL1b and JcTFL1c) in the biofuel plant Jatropha curcas were analysed using the transgenic approach. JcTFL1b and JcTFL1c, but not JcTFL1a, could complement the TFL1 function and rescue early flowering and determinate inflorescence phenotype in tfl1-14 Arabidopsis mutant, thus suggesting that JcTFL1b and JcTFL1c may be homologues of TFL1. Transgenic Jatropha overexpressing JcTFL1a, JcTFL1b or JcTFL1c showed late flowering, whereas only JcTFL1b and JcTFL1c overexpression delayed flowering in transgenic Arabidopsis. JcTFL1b-RNAi transgenic Jatropha consistently exhibited moderately early flowering phenotype. JcFT and JcAP1 were significantly downregulated in transgenic Jatropha overexpressing JcTFL1a, JcTFL1b or JcTFL1c, which suggested that the late flowering phenotype of these transgenic Jatropha may result from the repressed expression of JcFT and JcAP1. Our results indicate that these three JcTFL1 genes play redundant roles in repressing flowering in Jatropha.
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Affiliation(s)
- Chaoqiong Li
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China.,College of Life Science and Agronomy, Zhoukou Normal University, Zhoukou, Henan, 466001, China
| | - Qiantang Fu
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China
| | - Longjian Niu
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China
| | - Li Luo
- Key Laboratory of Gene Engineering of the Ministry of Education, and State Key Laboratory for Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
| | - Jianghua Chen
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China
| | - Zeng-Fu Xu
- Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China
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27
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Omura M, Shimada T. Citrus breeding, genetics and genomics in Japan. BREEDING SCIENCE 2016; 66:3-17. [PMID: 27069387 PMCID: PMC4780800 DOI: 10.1270/jsbbs.66.3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 12/09/2015] [Indexed: 05/03/2023]
Abstract
Citrus is one of the most cultivated fruits in the world, and satsuma mandarin (Citrus unshiu Marc.) is a major cultivated citrus in Japan. Many excellent cultivars derived from satsuma mandarin have been released through the improvement of mandarins using a conventional breeding method. The citrus breeding program is a lengthy process owing to the long juvenility, and it is predicted that marker-assisted selection (MAS) will overcome the obstacle and improve the efficiency of conventional breeding methods. To promote citrus molecular breeding in Japan, a genetic mapping was initiated in 1987, and the experimental tools and resources necessary for citrus functional genomics have been developed in relation to the physiological analysis of satsuma mandarin. In this paper, we review the progress of citrus breeding and genome researches in Japan and report the studies on genetic mapping, expression sequence tag cataloguing, and molecular characterization of breeding characteristics, mainly in terms of the metabolism of bio-functional substances as well as factors relating to, for example, fruit quality, disease resistance, polyembryony, and flowering.
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Affiliation(s)
- Mitsuo Omura
- Faculty of Agriculture, Shizuoka University,
836 Ohya, Suruga, Shizuoka, Shizuoka 422-8529,
Japan
| | - Takehiko Shimada
- Citrus Research Division, NARO Institute of Fruit Tree Science,
485-6 Okitsunakacho, Shimizu, Shizuoka, Shizuoka 424-0292,
Japan
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28
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Huang H, Chen S, Li H, Jiang J. Next-generation transcriptome analysis in transgenic birch overexpressing and suppressing APETALA1 sheds lights in reproduction development and diterpenoid biosynthesis. PLANT CELL REPORTS 2015; 34:1663-1680. [PMID: 26063613 DOI: 10.1007/s00299-015-1817-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Revised: 05/08/2015] [Accepted: 06/01/2015] [Indexed: 06/04/2023]
Abstract
Overexpression of BpAP1 could cause early flowering in birch. BpAP1 affected the expression of many flowering-related unigenes and diterpenoid biosynthesis in transgenic birch, and BpPI was a putative target gene of BpAP1. APETALA1 (AP1) is an MADS-box transcription factor that is involved in the flowering process in plants and has been a focus of genetic studies examining flower development. Here, we carried out transcriptome analysis of birch (Betula platyphylla Suk.), including BpAP1 overexpression lines, BpAP1 suppression lines, and non-transgenic line (NT). Compared with NT, we detected 8302 and 7813 differentially expressed unigenes in 35S::BpAP1 and 35S::BpAP1RNAi transgenic lines, respectively. Overexpression and suppression of BpAP1 in birch affected diterpenoid biosynthesis and altered expression of many flowering-related unigenes. Moreover, combining information from the RNA-seq database and the birch genome, we predicted downstream target genes of BpAP1. Among the 166 putative target genes of BpAP1, there was a positive correlation between BpAP1 and BpPI. These results provide references for further examining the relationship between BpAP1 and its target genes, and reveal that BpAP1 functions as a transcription regulator in birch.
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Affiliation(s)
- Haijiao Huang
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China,
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29
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Wickland DP, Hanzawa Y. The FLOWERING LOCUS T/TERMINAL FLOWER 1 Gene Family: Functional Evolution and Molecular Mechanisms. MOLECULAR PLANT 2015; 8:983-97. [PMID: 25598141 DOI: 10.1016/j.molp.2015.01.007] [Citation(s) in RCA: 214] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 12/19/2014] [Accepted: 01/09/2015] [Indexed: 05/18/2023]
Abstract
In plant development, the flowering transition and inflorescence architecture are modulated by two homologous proteins, FLOWERING LOCUS T (FT) and TERMINAL FLOWER 1 (TFL1). The florigen FT promotes the transition to reproductive development and flowering, while TFL1 represses this transition. Despite their importance to plant adaptation and crop improvement and their extensive study by the plant community, the molecular mechanisms controlling the opposing actions of FT and TFL1 have remained mysterious. Recent studies in multiple species have unveiled diverse roles of the FT/TFL1 gene family in developmental processes other than flowering regulation. In addition, the striking evolution of FT homologs into flowering repressors has occurred independently in several species during the evolution of flowering plants. These reports indicate that the FT/TFL1 gene family is a major target of evolution in nature. Here, we comprehensively survey the conserved and diverse functions of the FT/TFL1 gene family throughout the plant kingdom, summarize new findings regarding the unique evolution of FT in multiple species, and highlight recent work elucidating the molecular mechanisms of these proteins.
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Affiliation(s)
- Daniel P Wickland
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Yoshie Hanzawa
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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30
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Martínez-Alcántara B, Iglesias DJ, Reig C, Mesejo C, Agustí M, Primo-Millo E. Carbon utilization by fruit limits shoot growth in alternate-bearing citrus trees. JOURNAL OF PLANT PHYSIOLOGY 2015; 176:108-17. [PMID: 25588695 DOI: 10.1016/j.jplph.2014.12.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Revised: 11/28/2014] [Accepted: 12/01/2014] [Indexed: 05/25/2023]
Abstract
Fruit load in alternate-bearing citrus trees is reported to alter shoot number and growth during spring, summer, and autumn flushes, and the source-sink balance, which affects the storage and mobilization of reserve nutrients. The aim of this work was to assess the extent of shoot growth inhibition resulting from the presence of fruits in 'Moncada' mandarin trees loaded with fruit (ON) or with very light fruit load (OFF), and to identify the role of carbohydrates and nitrogenous compounds in the competition between fruits and shoots. Growth of reproductive and vegetative organs was measured on a monthly basis. (13)C- and (15)N-labeled compounds were supplied to trace the allocation of reserve nutrients and subsequent translocation from source to sink. At the end of the year, OFF trees produced more abundant flushes (2.4- and 4.9-fold higher in number and biomass, respectively) than ON trees. Fruits from ON trees accumulated higher C amounts at the expense of developing flushes, whereas OFF trees exhibited the opposite pattern. An inverse relationship was identified between the amount of C utilized by fruits and vegetative flush growth. (13)C-labeling revealed an important role for mature leaves of fruit-bearing branches in supporting shoot/fruit growth, and the elevated sink strength of growing fruits on shoots. N availability for vegetative shoots was not affected by the presence or absence of fruits, which accumulated important amounts of (15)N. In conclusion, our results show that shoot growth is resource-limited as a consequence of fruit development, and vegetative-growth inhibition is caused by photoassimilate limitation. The competence for N is not a decisive factor in limiting vegetative growth under the experimental conditions of this study.
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Affiliation(s)
- Belén Martínez-Alcántara
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain.
| | - Domingo J Iglesias
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain.
| | - Carmina Reig
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Carlos Mesejo
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Manuel Agustí
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Eduardo Primo-Millo
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
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31
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Jia T, Wei D, Meng S, Allan AC, Zeng L. Identification of regulatory genes implicated in continuous flowering of longan (Dimocarpus longan L.). PLoS One 2014; 9:e114568. [PMID: 25479005 PMCID: PMC4257721 DOI: 10.1371/journal.pone.0114568] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 11/12/2014] [Indexed: 11/19/2022] Open
Abstract
Longan (Dimocarpus longan L.) is a tropical/subtropical fruit tree of significant economic importance in Southeast Asia. However, a lack of transcriptomic and genomic information hinders research on longan traits, such as the control of flowering. In this study, high-throughput RNA sequencing (RNA-Seq) was used to investigate differentially expressed genes between a unique longan cultivar 'Sijimi'(S) which flowers throughout the year and a more typical cultivar 'Lidongben'(L) which flowers only once in the season, with the aim of identifying candidate genes associated with continuous flowering. 36,527 and 40,982 unigenes were obtained by de novo assembly of the clean reads from cDNA libraries of L and S cultivars. Additionally 40,513 unigenes were assembled from combined reads of these libraries. A total of 32,475 unigenes were annotated by BLAST search to NCBI non-redundant protein (NR), Swiss-Prot, Clusters of Orthologous Groups (COGs) and Kyoto Encyclopedia of Genes and Genomes (KEGG) databases. Of these, almost fifteen thousand unigenes were identified as significantly differentially expressed genes (DEGs) by using Reads Per kb per Million reads (RPKM) method. A total of 6,415 DEGs were mapped to 128 KEGG pathways, and 8,743 DEGs were assigned to 54 Gene Ontology categories. After blasting the DEGs to public sequence databases, 539 potential flowering-related DEGs were identified. In addition, 107 flowering-time genes were identified in longan, their expression levels between two longan samples were compared by RPKM method, of which the expression levels of 15 were confirmed by real-time quantitative PCR. Our results suggest longan homologues of SHORT VEGETATIVE PHASE (SVP), GIGANTEA (GI), F-BOX 1 (FKF1) and EARLY FLOWERING 4 (ELF4) may be involved this flowering trait and ELF4 may be a key gene. The identification of candidate genes related to continuous flowering will provide new insight into the molecular process of regulating flowering time in woody plants.
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Affiliation(s)
- Tianqi Jia
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian, P. R. China
| | - Danfeng Wei
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian, P. R. China
| | - Shan Meng
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian, P. R. China
| | - Andrew C. Allan
- The New Zealand Institute for Plant & Food Research Limited (Plant & Food Research), Mt Albert, Auckland, New Zealand
| | - Lihui Zeng
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian, P. R. China
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Huang H, Wang S, Jiang J, Liu G, Li H, Chen S, Xu H. Overexpression of BpAP1 induces early flowering and produces dwarfism in Betula platyphylla × Betula pendula. PHYSIOLOGIA PLANTARUM 2014; 151:495-506. [PMID: 24200078 DOI: 10.1111/ppl.12123] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 09/27/2013] [Accepted: 10/27/2013] [Indexed: 05/04/2023]
Abstract
The involvement of APETALA1 (AP1) in the flowering transition has been the focus of much research. Here, we produced Betula platyphylla × Betula pendula (birch) lines that overexpressed BpAP1 using Agrobacterium-mediated transformation; we obtained five independent 35S::BpAP1 transgenic lines. Polymerase chain reaction (PCR), Southern, northern and western analyses were used to identify the transformants. As determined by quantitative real-time PCR (qRT-PCR), BpAP1 expression in roots, shoots, leaves and terminal buds of 35S::BpAP1 transgenic lines was significantly higher than that in the wild type (WT, P < 0.01). The average height of 2-year-old 35S::BpAP1 plants was significantly lower (41.17%) than that of non-transgenic plants. In the 35S::BpAP1 lines, inflorescences emerged successively beginning 2 months after transplanting. In addition, the length-diameter ratio of fully developed male and female inflorescences were both significantly less than those of the WT (P < 0.05), i.e. the morphological characteristic was stubby. The male inflorescences emerged early, with empty, draped anthers, and pollen was rarely produced, whereas the female floret structure was not different from WT. The pistils developed normally and could accept pollen, leading to the production of hybrid progeny (F1 ). F1 plants completed flowering within only 1 year after sowing. We demonstrate that BpAP1 can be inherited through sexual reproduction. Overexpression of BpAP1 caused early flowering and dwarfism; these lines had an obviously shortened juvenile phase. These results greatly increase our understanding of the mechanisms underlying the flowering transition and enhance genetic studies of birch traits, and they open up new possibilities for the breeding of birch and other woody plants.
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Affiliation(s)
- Haijiao Huang
- State Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University, 26 Hexing Road, Harbin, 150040, China
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Wang X, Zhang X, Zhao L, Guo Z. Morphology and quantitative monitoring of gene expression patterns during floral induction and early flower development in Dendrocalamus latiflorus. Int J Mol Sci 2014; 15:12074-93. [PMID: 25003644 PMCID: PMC4139830 DOI: 10.3390/ijms150712074] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 06/04/2014] [Accepted: 06/16/2014] [Indexed: 01/04/2023] Open
Abstract
The mechanism of floral transition in bamboo remains unclear. Dendrocalamus latiflorus (Bambusease, Bambusoideae, Poaceae) is an economically and ecologically important clumping bamboo in tropical and subtropical areas. We evaluated morphological characteristics and gene expression profiling to study floral induction and early flower development in D. latiflorus. The detailed morphological studies on vegetative buds and floral organography were completed using paraffin sectioning and scanning electron microscopy. The 3 mm floral buds commence the development of stamen primordia and pistil primordium. Furthermore, homologs of floral transition-related genes, including AP1, TFL1, RFL, PpMADS1, PpMADS2, SPL9, FT, ID1, FCA, and EMF2, were detected and quantified by reverse transcriptase PCR and real-time PCR in vegetative and floral buds, respectively. Distinct expression profiles of ten putative floral initiation homologues that corresponded to the developmental stages defined by bud length were obtained and genes were characterized. Six of the genes (including DlTFL1, DlRFL, DlMADS2, DlID1, DlFCA, DlEMF2) showed statistically significant changes in expression during floral transition. DlAP1 demonstrated a sustained downward trend and could serve as a good molecular marker during floral transition in D. latiflorus. The combined analysis provided key candidate markers to track the transition from the vegetative to reproductive phase.
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Affiliation(s)
- Xiaoyan Wang
- China Southwest Germplasm Bank of Wild Species, the Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
| | - Xuemei Zhang
- China Southwest Germplasm Bank of Wild Species, the Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
| | - Lei Zhao
- China Southwest Germplasm Bank of Wild Species, the Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
| | - Zhenhua Guo
- China Southwest Germplasm Bank of Wild Species, the Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
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Isolation and Characterization ofTerminal Flower1Homolog Promoter from Precocious Trifoliata Mutant (Poncirus TrifoliataL. Raf.) in Transgenic Arabidopsis. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.2478/v10133-009-0016-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Zhang JZ, Mei L, Liu R, Khan MRG, Hu CG. Possible involvement of locus-specific methylation on expression regulation of leafy homologous gene (CiLFY) during precocious trifoliate orange phase change process. PLoS One 2014; 9:e88558. [PMID: 24523915 PMCID: PMC3921215 DOI: 10.1371/journal.pone.0088558] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 01/07/2014] [Indexed: 01/06/2023] Open
Abstract
DNA methylation plays an essential role in regulating plant development. Here, we described an early flowering trifoliate orange (precocious trifoliate orange, Poncirus trifoliata L. Raf) was treated with 5-azacytidine and displayed a number of phenotypic and developmental abnormalities. These observations suggested that DNA methylation might play an important role in regulating many developmental pathways including early flowering trait, and then the expression level of five key or integrated citrus flowering genes were analyzed. Our results showed that FLOWERING LOCUS T (CiFT) relative expression level was increased with the increasing concentrations of 5-AzaC. However, LEAFY (CiLFY), APETELA1 (CiAP1), TERMINAL FLOWER1 (CiTFL1), and FLOWERING LOCUS C (CiFLC) showed highest relative expression levels at 250 µΜ treatment, while decreased sharply at higher concentrations. In order to further confirm DNA methylation affects the expression of these genes, their full-length sequences were isolated by genome-walker method, and then was analyzed by using bioinformatics tools. However, only one locus-specific methylation site was observed in CiLFY sequence. Therefore, DNA methylation level of the CiLFY was investigated both at juvenile and adult stages of precocious trifoliate orange by bisulfate sequencing PCR; it has been shown that the level of DNA methylation was altered during phase change. In addition, spatial and temporal expression patterns of CiLFY promoter and a series of 5′ deletions were investigated by driving the expression of a β-glucuronidase reporter gene in Arabidopsis. Exogenous GA3 treatment on transgenic Arabidopsis revealed that GA3 might be involved in the developmental regulation of CiLFY during flowering process of precocious trifoliate orange. These results provided insights into the molecular regulation of CiLFY gene expression, which would be helpful for studying citrus flowering.
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Affiliation(s)
- Jin-Zhi Zhang
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, Hubei Province, China
| | - Li Mei
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, Hubei Province, China
| | - Rong Liu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, Hubei Province, China
| | - Muhammad Rehman Gul Khan
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, Hubei Province, China
| | - Chun-Gen Hu
- Key Laboratory of Horticultural Plant Biology (Ministry of Education), College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, Hubei Province, China
- * E-mail:
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Muñoz-Fambuena N, Mesejo C, Reig C, Agustí M, Tárraga S, Lisón P, Iglesias DJ, Primo-Millo E, González-Mas MC. Proteomic study of 'Moncada' mandarin buds from on- versus off-crop trees. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 73:41-55. [PMID: 24056126 DOI: 10.1016/j.plaphy.2013.08.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Accepted: 08/21/2013] [Indexed: 06/02/2023]
Abstract
A proteomic analysis of buds from mandarin trees with contrasting fruit load (on- and off-crop trees) was carried out during the onset of low-temperature induction. The aim of the study was to find out more about the molecular mechanism relating to alternate bearing in Citrus and its relationship with flowering. The 'Moncada' variety (Clementine 'Oroval'x'Kara' mandarin), displaying remarkable behaviour in alternate production, was used in this study. From 2D DIGE gel, 192 spots were isolated: 97 showed increased expression in the off-crop buds as compared to the on-crop buds, while 95 exhibited enhanced expression in the on-crop buds versus the off-crop buds. These spots were identified by MALDI-MS or LC-MS-MS. The largest groups of proteins up-expressed in the off-crop buds were the proteins involved in carbohydrate and amino acid metabolism, and the proteins expressed in response to stimuli such as reactive oxygen species. The largest groups of proteins up-expressed in the on-crop buds were related to primary metabolism, oxidative stress and defence responses. Depending on their function, some of these proteins can stimulate the flowering, such as fructose-bisphosphate aldolase or leucine-rich repeat transmembrane protein kinase, while others can inhibit it, such as cytochrome c oxidase subunit II. Twenty-two other proteins with unknown functions were up-expressed in the on- or off-crop buds.
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Affiliation(s)
- Natalia Muñoz-Fambuena
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, C/Ingeniero Fausto Elio, E-46022 Valencia, Spain
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Castillo MC, Forment J, Gadea J, Carrasco JL, Juarez J, Navarro L, Ancillo G. Identification of transcription factors potentially involved in the juvenile to adult phase transition in Citrus. ANNALS OF BOTANY 2013; 112:1371-81. [PMID: 24052558 PMCID: PMC3806540 DOI: 10.1093/aob/mct211] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 08/05/2013] [Indexed: 06/01/2023]
Abstract
BACKGROUND AND AIMS The juvenile to adult transition (JAT) in higher plants is required for them to reach reproductive competence. However, it is a poorly understood process in woody plants, where only a few genes have been definitely identified as being involved in this transition. This work aims at increasing our understanding of the mechanisms regulating the JAT in citrus. METHODS Juvenile and adult plants from Pineapple sweet orange (Citrus sinensis) and Rough lemon (C. jambhiri) were used to screen for differentially expressed transcription factors (TFs) using a 1·15K microarray developed on the basis of the CitrusTF database. Murcott tangor (C. reticulata × C. sinensis) and Duncan grapefruit (C. paradisi) were incorporated into the quantitative real-time reverse transcription-PCR validation in order to select those genes whose phase-specific regulation was common to the four species. KEY RESULTS A browsable web database has been created with information about the structural and functional annotation related to 1152 unigenes of putative citrus TFs (CTFs). This database constitutes a valuable resource for research on transcriptional regulation and comparative genomics. Moreover, a microarray has been developed and used that contains these putative CTFs, in order to identify eight genes that showed differential expression in juvenile and adult meristems of four different species of citrus. Those genes have been characterized, and their expression pattern in vegetative and reproductive tissues has been analysed. Four of them are MADS-box genes, a family of TFs involved in developmental processes, whereas another one resembles MADS-box genes but lacks the MADS box itself. The other three showed high partial sequence similarity restricted to specific Arabidopsis protein domains but negligible outside those domains. CONCLUSIONS The work presented here indicates that the JAT in citrus could be controlled by mechanisms that are in part common to those of Arabidopsis, but also somehow different, since specific factors without Arabidopsis orthologues have also been characterized. The potential involvement of the genes in the JAT is discussed.
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Affiliation(s)
- Mari-Cruz Castillo
- Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (IVIA), Carretera Moncada-Náquera, Km. 4·5, 46113 Moncada (Valencia), Spain
| | - Javier Forment
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia (CSIC-UPV), C/ Ingeniero Fausto Elio, s/n, 46022 Valencia, Spain
| | - José Gadea
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia (CSIC-UPV), C/ Ingeniero Fausto Elio, s/n, 46022 Valencia, Spain
| | - Jose Luis Carrasco
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia (CSIC-UPV), C/ Ingeniero Fausto Elio, s/n, 46022 Valencia, Spain
| | - José Juarez
- Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (IVIA), Carretera Moncada-Náquera, Km. 4·5, 46113 Moncada (Valencia), Spain
| | - Luís Navarro
- Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (IVIA), Carretera Moncada-Náquera, Km. 4·5, 46113 Moncada (Valencia), Spain
| | - Gema Ancillo
- Centro de Protección Vegetal y Biotecnología, Instituto Valenciano de Investigaciones Agrarias (IVIA), Carretera Moncada-Náquera, Km. 4·5, 46113 Moncada (Valencia), Spain
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Wang Y, Pijut PM. Isolation and characterization of a TERMINAL FLOWER 1 homolog from Prunus serotina Ehrh. TREE PHYSIOLOGY 2013; 33:855-65. [PMID: 23956129 DOI: 10.1093/treephys/tpt051] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Flowering control is one of the several strategies for gene containment of transgenic plants. TERMINAL FLOWER 1 (TFL1) is known to be involved in the transcriptional repression of genes for inflorescence development. Two TFL1 transcripts with different 3' UTR were cloned from black cherry (Prunus serotina Ehrh.) using reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). Corresponding to the two TFL1 transcripts, two PsTFL1 gene sequences, 1248 bp and 1579 bp, were obtained and both contained the same 519 bp coding region which encoded a putative protein of 172 amino acid residues. The phylogenetic analysis of the amino acid sequences showed high identity of PsTFL1 to TFL1 orthologs of other Prunus species, including Yoshino cherry (Prunus × yedoensis Matsum.), peach (Prunus persica (L.) Batsch), apricot (Prunus armeniaca L.) and Japanese apricot (Prunus mume Sieb. et Zucc.). The real-time quantitative PCR detected a single copy of PsTFL1 gene sequences in the black cherry genome with two alleles. The gene expression of PsTFL1 was examined in several tissues including the stems, leaves, shoot tips, and vegetative and floral buds. The highest mRNA level was detected in shoot tips, and the lowest level in the leaves. Transgenic Arabidopsis thaliana (L.) Heynh. plants overexpressing PsTFL1 showed significantly delayed flowering. These plants also showed largely increased vegetative growth, plant height, number of nodes, trichome density, and the conversion of flower to shoot was observed at each node and shoot apex.
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Affiliation(s)
- Ying Wang
- Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center (HTIRC), Purdue University, 715 West State St., West Lafayette, IN 47907, USA
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Goldberg-Moeller R, Shalom L, Shlizerman L, Samuels S, Zur N, Ophir R, Blumwald E, Sadka A. Effects of gibberellin treatment during flowering induction period on global gene expression and the transcription of flowering-control genes in Citrus buds. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2013. [PMID: 23199686 DOI: 10.1016/j.plantsci.2012.09.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Gibberellins (GAs) affect flowering in a species-dependent manner: in long-day and biennial plants they promote flowering, whereas in other plants, including fruit trees, they inhibit it. The mechanism by which GAs promote flowering in Arabidopsis is not fully understood, although there is increasing evidence that they may act through more than one pathway. In citrus, GA treatment during the flowering induction period reduces the number of flowers; the mechanism of flowering inhibition is not clear; the hormone may act directly in the bud to determine its fate toward vegetative growth, generate a mobile signal, or both. However, bud metabolic and regulatory pathways are expected to be altered upon GA treatment. We investigated the effect of GA treatments on global gene expression in the bud during the induction period, and on the expression of key flowering genes. Overall, about 2000 unigenes showed altered expression, with about 300 showing at least a two-fold change. Changes in flavonoids and trehalose metabolic pathways were validated, and among other altered pathways, such as cell-wall components, were discussed in light of GA's inhibition of flowering. Among flowering-control genes, GA treatment resulted in reduced mRNA levels of FT, AP1 and a few flower-organ-identity genes. mRNA levels of FLC-like and SOC1 were not altered by the treatment, whereas LEAFY mRNA was induced in GA-treated buds. Surprisingly, FT expression was higher in buds than leaves. Overall, our results shed light on changes taking place in the bud during flowering induction in response to GA treatment.
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Affiliation(s)
- Ravit Goldberg-Moeller
- Department of Fruit Trees Sciences, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
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Muñoz-Fambuena N, Mesejo C, González-Mas MC, Primo-Millo E, Agustí M, Iglesias DJ. Fruit load modulates flowering-related gene expression in buds of alternate-bearing 'Moncada' mandarin. ANNALS OF BOTANY 2012; 110:1109-18. [PMID: 22915579 PMCID: PMC3478051 DOI: 10.1093/aob/mcs190] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2012] [Accepted: 07/10/2012] [Indexed: 05/07/2023]
Abstract
BACKGROUND AND AIMS Gene determination of flowering is the result of complex interactions involving both promoters and inhibitors. In this study, the expression of flowering-related genes at the meristem level in alternate-bearing citrus trees is analysed, together with the interplay between buds and leaves in the determination of flowering. METHODS First defruiting experiments were performed to manipulate blossoming intensity in 'Moncada' mandarin, Citrus clementina. Further defoliation was performed to elucidate the role leaves play in the flowering process. In both cases, the activity of flowering-related genes was investigated at the flower induction (November) and differentiation (February) stages. KEY RESULTS Study of the expression pattern of flowering-genes in buds from on (fully loaded) and off (without fruits) trees revealed that homologues of FLOWERING LOCUS T (CiFT), TWIN SISTER OF FT (TSF), APETALA1 (CsAP1) and LEAFY (CsLFY) were negatively affected by fruit load. CiFT and TSF activities showed a marked increase in buds from off trees through the study period (ten-fold in November). By contrast, expression of the homologues of the flowering inhibitors of TERMINAL FLOWER 1 (CsTFL), TERMINAL FLOWER 2 (TFL2) and FLOWERING LOCUS C (FLC) was generally lower in off trees. Regarding floral identity genes, the increase in CsAP1 expression in off trees was much greater in buds than in leaves, and significant variations in CsLFY expression (approx. 20 %) were found only in February. Defoliation experiments further revealed that the absence of leaves completely abolished blossoming and severely affected the expression of most of the flowering-related genes, particularly decreasing the activity of floral promoters and of CsAP1 at the induction stage. CONCLUSIONS These results suggest that the presence of fruit affects flowering by greatly altering gene-expression not only at the leaf but also at the meristem level. Although leaves are required for flowering to occur, their absence strongly affects the activity of floral promoters and identity genes.
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Affiliation(s)
- Natalia Muñoz-Fambuena
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Carlos Mesejo
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - M. Carmen González-Mas
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
| | - Eduardo Primo-Millo
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
| | - Manuel Agustí
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Domingo J. Iglesias
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
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Shalom L, Samuels S, Zur N, Shlizerman L, Zemach H, Weissberg M, Ophir R, Blumwald E, Sadka A. Alternate bearing in citrus: changes in the expression of flowering control genes and in global gene expression in ON- versus OFF-crop trees. PLoS One 2012; 7:e46930. [PMID: 23071667 PMCID: PMC3469648 DOI: 10.1371/journal.pone.0046930] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2012] [Accepted: 09/06/2012] [Indexed: 11/20/2022] Open
Abstract
Alternate bearing (AB) is the process in fruit trees by which cycles of heavy yield (ON crop) one year are followed by a light yield (OFF crop) the next. Heavy yield usually reduces flowering intensity the following year. Despite its agricultural importance, how the developing crop influences the following year's return bloom and yield is not fully understood. It might be assumed that an ‘AB signal’ is generated in the fruit, or in another organ that senses fruit presence, and moves into the bud to determine its fate—flowering or vegetative growth. The bud then responds to fruit presence by altering regulatory and metabolic pathways. Determining these pathways, and when they are altered, might indicate the nature of this putative AB signal. We studied bud morphology, the expression of flowering control genes, and global gene expression in ON- and OFF-crop buds. In May, shortly after flowering and fruit set, OFF-crop buds were already significantly longer than ON-crop buds. The number of differentially expressed genes was higher in May than at the other tested time points. Processes differentially expressed between ON- and OFF-crop trees included key metabolic and regulatory pathways, such as photosynthesis and secondary metabolism. The expression of genes of trehalose metabolism and flavonoid metabolism was validated by nCounter technology, and the latter was confirmed by metabolomic analysis. Among genes induced in OFF-crop trees was one homologous to SQUAMOSA PROMOTER BINDING-LIKE (SPL), which controls juvenile-to-adult and annual phase transitions, regulated by miR156. The expression pattern of SPL-like, miR156 and other flowering control genes suggested that fruit load affects bud fate, and therefore development and metabolism, a relatively long time before the flowering induction period. Results shed light on some of the metabolic and regulatory processes that are altered in ON and OFF buds.
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Affiliation(s)
- Liron Shalom
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Sivan Samuels
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Naftali Zur
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Lyudmila Shlizerman
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Hanita Zemach
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Mira Weissberg
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Ron Ophir
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
| | - Eduardo Blumwald
- Department of Plant Sciences, University of California Davis, Davis, California, United States of America
| | - Avi Sadka
- Department of Fruit Tree Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel
- * E-mail:
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Iwata H, Gaston A, Remay A, Thouroude T, Jeauffre J, Kawamura K, Oyant LHS, Araki T, Denoyes B, Foucher F. The TFL1 homologue KSN is a regulator of continuous flowering in rose and strawberry. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 69:116-25. [PMID: 21895811 DOI: 10.1111/j.1365-313x.2011.04776.x] [Citation(s) in RCA: 156] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Flowering is a key event in plant life, and is finely tuned by environmental and endogenous signals to adapt to different environments. In horticulture, continuous flowering (CF) is a popular trait introduced in a wide range of cultivated varieties. It played an essential role in the tremendous success of modern roses and woodland strawberries in gardens. CF genotypes flower during all favourable seasons, whereas once-flowering (OF) genotypes only flower in spring. Here we show that in rose and strawberry continuous flowering is controlled by orthologous genes of the TERMINAL FLOWER 1 (TFL1) family. In rose, six independent pairs of CF/OF mutants differ in the presence of a retrotransposon in the second intron of the TFL1 homologue. Because of an insertion of the retrotransposon, transcription of the gene is blocked in CF roses and the absence of the floral repressor provokes continuous blooming. In OF-climbing mutants, the retrotransposon has recombined to give an allele bearing only the long terminal repeat element, thus restoring a functional allele. In OF roses, seasonal regulation of the TFL1 homologue may explain the seasonal flowering, with low expression in spring to allow the first bloom. In woodland strawberry, Fragaria vesca, a 2-bp deletion in the coding region of the TFL1 homologue introduces a frame shift and is responsible for CF behaviour. A diversity analysis has revealed that this deletion is always associated with the CF phenotype. Our results demonstrate a new role of TFL1 in perennial plants in maintaining vegetative growth and modifying flowering seasonality.
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Affiliation(s)
- Hikaru Iwata
- Wakunaga Pharmaceutical Co., Ltd. 1624 Shimokodachi, Akitakatashi, Hiroshima 739-1195, Japan
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Muñoz-Fambuena N, Mesejo C, Carmen González-Mas M, Primo-Millo E, Agustí M, Iglesias DJ. Fruit regulates seasonal expression of flowering genes in alternate-bearing 'Moncada' mandarin. ANNALS OF BOTANY 2011; 108:511-9. [PMID: 21856639 PMCID: PMC3158683 DOI: 10.1093/aob/mcr164] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Accepted: 05/03/2011] [Indexed: 05/07/2023]
Abstract
BACKGROUND AND AIMS The presence of fruit has been widely reported to act as an inhibitor of flowering in fruit trees. This study is an investigation into the effect of fruit load on flowering of 'Moncada' mandarin and on the expression of putative orthologues of genes involved in flowering pathways to provide insight into the molecular mechanisms underlying alternate bearing in citrus. METHODS The relationship between fruit load and flowering intensity was examined first. Defruiting experiments were further conducted to demonstrate the causal effect of fruit removal upon flowering. Finally, the activity of flowering-related genes was investigated to determine the extent to which their seasonal expression is affected by fruit yield. KEY RESULTS First observations and defruiting experiments indicated a significant inverse relationship between preceding fruit load and flowering intensity. Moreover, data indicated that when fruit remained on the tree from November onwards, a dramatic inhibition of flowering occurred the following spring. The study of the expression pattern of flowering-genes of on (fully loaded) and off (without fruits) trees revealed that homologues of FLOWERING LOCUS T (FT), SUPRESSOR OF OVEREXPRESSION OF CONSTANS 1 (SOC1), APETALA1 (AP1) and LEAFY (LFY) were negatively affected by fruit load. Thus, CiFT expression showed a progressive increase in leaves from off trees through the study period, the highest differences found from December onwards (10-fold). Whereas differences in the relative expression of SOC1 only reached significance from September to mid-December, CsAP1 expression was constantly higher in those trees through the whole study period. Significant variations in CsLFY expression only were found in late February (close to 20 %). On the other hand, the expression of the homologues of TERMINAL FLOWER 1 (TFL1) and FLOWERING LOCUS C (FLC) did not appear to be related to fruit load. CONCLUSIONS These results suggest for the first time that fruit inhibits flowering by repressing CiFT and SOC1 expression in leaves of alternate-bearing citrus. Fruit also reduces CsAP1 expression in leaves, and the significant increase in leaf CsLFY expression from off trees in late February was associated with the onset of floral differentiation.
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Affiliation(s)
- Natalia Muñoz-Fambuena
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Carlos Mesejo
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - M. Carmen González-Mas
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
| | - Eduardo Primo-Millo
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
| | - Manuel Agustí
- Instituto Agroforestal Mediterráneo, Universidad Politécnica de Valencia, E-46022 Valencia, Spain
| | - Domingo J. Iglesias
- Centro de Citricultura y Producción Vegetal, Instituto Valenciano de Investigaciones Agrarias, E-46113 Moncada, Valencia, Spain
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Wang LN, Liu YF, Zhang YM, Fang RX, Liu QL. The expression level of Rosa Terminal Flower 1 (RTFL1) is related with recurrent flowering in roses. Mol Biol Rep 2011; 39:3737-46. [PMID: 21739143 DOI: 10.1007/s11033-011-1149-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Accepted: 06/24/2011] [Indexed: 01/28/2023]
Abstract
We examined the relationship between the recurrent flowering character and the expression patterns of TERMINAL FLOWER 1 (TFL1) homologs in roses, using flower buds of Rosa multiflora, R. rugosa, R. chinensis, and six other rose species and nine rose cultivars. RTFL1 (Rosa TFL1) genes were amplified from rose genomic DNA using a combination of degenerate and gene-specific primers by thermal asymmetric interlaced-PCR and normal PCR, respectively. Their copy numbers in different species were determined by Southern blots. We used real-time PCR to analyze the expression patterns of RTFL1 genes at four developmental stages (pre-sprouting, young, mid-aged, and mature flower buds). Our results show that there are at least three RTFL1 homologs in roses; RTFL1a, RTFL1b, and RTFL1c. The sequences of the homologs were more similar among the same homolog in different species than among the different homologs in the same species. For RTFL1a, we detected two copies in R. multiflora, two copies in R. rugosa, and one copy in R. chinensis. For RTFL1c, we detected one copy in R. multiflora, two copies in R. rugosa, and three copies in R. chinensis. We detected only one copy of RTFL1b in R. chinensis. RTFL1c was expressed at high levels at all four flowering stages in R. multiflora and R. rugosa, which are non-recurrent flowering species, whereas it was barely detected in R. chinensis (a recurrent flowering species) at any stage. These results were further verified in six other non-recurrent flowering species and nine recurrent flowering cultivars. These results suggest that the recurrent flowering habit in roses results from lower expression of RTFL1c, which may be related to recurrent flowering character in roses.
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Affiliation(s)
- Li-Na Wang
- Department of Ornamental Horticulture and Landscape Architecture, China Agricultural University, Beijing, 100193, China
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Zhang JZ, Ai XY, Sun LM, Zhang DL, Guo WW, Deng XX, Hu CG. Molecular cloning and functional characterization of genes associated with flowering in citrus using an early-flowering trifoliate orange (Poncirus trifoliata L. Raf.) mutant. PLANT MOLECULAR BIOLOGY 2011; 76:187-204. [PMID: 21533840 DOI: 10.1007/s11103-011-9780-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2010] [Accepted: 04/18/2011] [Indexed: 05/30/2023]
Abstract
To isolate differentially expressed genes during the juvenile-to-adult phase transition of an early-flowering trifoliate orange mutant (precocious trifoliate orange, Poncirus trifoliata), suppression subtractive hybridization was performed. In total, 463 cDNA clones chosen by differential screening of 1,920 clones were sequenced and 178 differentially expressed genes were identified, among which 41 sequences did not match any known nucleotide sequence. Analysis of expression profiles of the differentially expressed genes through hybridization on customized chips revealed their expression change was associated with the phase transition from juvenile to adult in the mutant. Open reading frames of nine selected genes were successfully determined by rapid amplification of cDNA ends. Expression analysis of these genes by real-time RT-PCR showed that transcript levels of several genes were associated with floral induction and inflorescence development. Among these genes, HM596718, a sequence sharing a high degree of similarity with Arabidopsis EARLY FLOWERING 5 (AtELF5) was discovered. Real-time PCR and in situ hybridization indicated its expression pattern was closely correlated with floral induction and flowering of the mutant. Ectopic expression of the gene in Arabidopsis caused early flowering; however, its functional characterization is different than the role of AtELF5 observed in Arabidopsis. A yeast two-hybrid assay indicated that PtELF5 significantly interacted with DUF1336 domain of a hypothetical protein, which has not yet been functionally characterized in woody plants. These findings suggest that PtELF5 may be a novel gene that plays an important role during the early flowering of precocious trifoliate orange.
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Affiliation(s)
- Jin-Zhi Zhang
- Key Laboratory of Horticultural Plant Biology, Ministry of Education, College of Horticulture and Forestry Science, Huazhong Agricultural University, Wuhan, China.
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Danilevskaya ON, Meng X, Ananiev EV. Concerted modification of flowering time and inflorescence architecture by ectopic expression of TFL1-like genes in maize. PLANT PHYSIOLOGY 2010; 153:238-51. [PMID: 20200067 PMCID: PMC2862429 DOI: 10.1104/pp.110.154211] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Accepted: 02/26/2010] [Indexed: 05/18/2023]
Abstract
TERMINAL FLOWER1 (TFL1)-like genes are highly conserved in plants and are thought to function in the maintenance of meristem indeterminacy. Recently, we described six maize (Zea mays) TFL1-related genes, named ZEA CENTRORADIALIS1 (ZCN1) to ZCN6. To gain insight into their functions, we generated transgenic maize plants overexpressing their respective cDNAs driven by a constitutive promoter. Overall, ectopic expression of the maize TFL1-like genes produced similar phenotypes, including delayed flowering and altered inflorescence architecture. We observed an apparent relationship between the magnitude of the transgenic phenotypes and the degree of homology between the ZCN proteins. ZCN2, -4, and -5 form a monophylogenetic clade, and their overexpression produced the strongest phenotypes. Along with very late flowering, these transgenic plants produced a "bushy" tassel with increased lateral branching and spikelet density compared with nontransgenic siblings. On the other hand, ZCN1, -3, and -6 produced milder effects. Among them, ZCN1 showed moderate effects on flowering time and tassel morphology, whereas ZCN3 and ZCN6 did not change flowering time but still showed effects on tassel morphology. In situ hybridizations of tissue from nontransgenic plants revealed that the expression of all ZCN genes was associated with vascular bundles, but each gene had a specific spatial and temporal pattern. Expression of four ZCN genes localized to the protoxylem, whereas ZCN5 was expressed in the protophloem. Collectively, our findings suggest that ectopic expression of the TFL1-like genes in maize modifies flowering time and inflorescence architecture through maintenance of the indeterminacy of the vegetative and inflorescence meristems.
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Affiliation(s)
- Olga N Danilevskaya
- Pioneer Hi-Bred International, a DuPont Business, Johnston, Iowa 50131, USA.
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Nishikawa F, Endo T, Shimada T, Fujii H, Shimizu T, Kobayashi Y, Araki T, Omura M. Transcriptional changes in CiFT-introduced transgenic trifoliate orange (Poncirus trifoliata L. Raf.). TREE PHYSIOLOGY 2010; 30:431-439. [PMID: 20086118 DOI: 10.1093/treephys/tpp122] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Ectopic expression of a Flowering Locus T (CiFT) from Citrus confers an early flowering phenotype on trifoliate orange (Poncirus trifoliata L. Raf.). To profile transcriptional effects of CiFT, mRNA extracted from the shoots of the transgenic trifoliate orange was subjected to genetic analysis using a 22-K oligo DNA microarray. Microarray results and reverse transcription polymerase chain reaction analysis indicated that genes relating to transcription, cell wall modification and defense responses were expressed at higher levels in the transgenic shoots than in the control wild-type shoots. Of the genes showing ectopic mRNA accumulation, two SEPALLATA (SEP) and one FRUITFULL (FUL) homologues (CuSEP1, CuSEP3 or CuFUL) were introduced to Arabidopsis thaliana. Constitutive expression of each gene caused early flowering in transgenic Arabidopsis, suggesting that these genes could function as regulators of flowering time.
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Affiliation(s)
- Fumie Nishikawa
- Okitsu Citrus Research Station, National Institute of Fruit Tree Science, National Agricultural Research Organization, 424-0292, Okitsu Shimizu-ku, Shizuoka, Japan.
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Jaya ESKD, Clemens J, Song J, Zhang H, Jameson PE. Quantitative expression analysis of meristem identity genes in Eucalyptus occidentalis: AP1 is an expression marker for flowering. TREE PHYSIOLOGY 2010; 30:304-12. [PMID: 20038505 DOI: 10.1093/treephys/tpp117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A number of Eucalyptus species exhibit precocious flowering, flowering within a year of germination and often while still exhibiting juvenile foliage. To understand the nature of precocious flowering in Eucalyptus occidentalis, partial homologues of the inflorescence meristem identity gene TERMINAL FLOWER1 and of the floral meristem identity genes LEAFY and APETALA1 (EOTFL1, EOLFY and EOAP1, respectively) were isolated and characterized. The expression patterns of these meristem identity genes during the development of branched and single-stem plants were analysed by quantitative reverse transcriptase PCR. All E. occidentalis plants commenced flowering within 40 weeks of germination. However, the branched plants reached maximum flowering some 5-6 weeks earlier than did single-stem plants. Levels of EOTFL1 and EOLFY expression varied little during the study period irrespective of architecture treatment, whereas expression of EOAP1 reached a peak coincident with peak flowering in both branched and single-stem plants. AP1 is clearly an expression marker for flowering in this species.
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Affiliation(s)
- Elizabeth S K D Jaya
- Institute of Molecular Biosciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand
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50
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King RW, Heide OM. Seasonal flowering and evolution: the heritage from Charles Darwin. FUNCTIONAL PLANT BIOLOGY : FPB 2010; 36:1027-1036. [PMID: 32688714 DOI: 10.1071/fp09170] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2009] [Accepted: 09/02/2009] [Indexed: 06/11/2023]
Abstract
To survive, plants optimise their seasonal flowering time and set seed to avoid extremes of the environment including frost, heat and drought. Additionally, pollination may need to be tightly regulated in time so that it coincides with flowering of other individuals and/or with the presence of bird or insect pollinators. It is now clear that plants use seasonal changes in natural light intensity, daylight duration and temperature to achieve reproducible timing of flowering year-in-year-out. In more recent studies, genetic and molecular approaches are beginning to provide a basis for understanding heritability, an essential component of Darwin's concept of evolution.
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Affiliation(s)
- R W King
- CSIRO Plant Industry, P.O. Box 1600, Canberra, ACT 2601, Australia
| | - O M Heide
- Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, NO-1432 Ås, Norway
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