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Shumbusho A, Harrison CJ, Demko V. CLE peptides act via the receptor-like kinase CRINKLY 4 in Physcomitrium patens gametophore development. PLANT SIGNALING & BEHAVIOR 2024; 19:2386502. [PMID: 39082799 PMCID: PMC11296525 DOI: 10.1080/15592324.2024.2386502] [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: 05/30/2024] [Revised: 07/23/2024] [Accepted: 07/25/2024] [Indexed: 08/04/2024]
Abstract
The CLAVATA pathway plays a key role in the regulation of multicellular shoot and root meristems in flowering plants. In Arabidopsis, CLAVATA 3-like signaling peptides (CLEs) act via receptor-like kinases CLAVATA 1 and CRINKLY 4 (CR4). In the moss Physcomitrium patens, PpCLAVATA and PpCR4 were previously studied independently and shown to play conserved roles in the regulation of cell proliferation and differentiation. The plant calpain DEFECTIVE KERNEL 1 (DEK1) has been identified as another key regulator of cell division and cell fate in vascular plants and bryophytes. The functional interaction between CLAVATA, CR4, and DEK1 remains unknown. Here, we show that P. patens crinkly4 and dek1 mutants respond differently to CLE peptide treatments suggesting their distinct roles in the CLAVATA pathway. Reduced CLAVATA-mediated suppression of leafy shoot growth in Δcr4 mutants indicates that PpCR4 is involved in CLV3p perception, most likely as a receptor. The CLV3p strongly suppressed leaf vein development in Δcr4 mutants, suggesting that other receptors are involved in these processes and indicating a potential role of PpCR4 in organ sensitization to CLEs.
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Affiliation(s)
- Alain Shumbusho
- Faculty of Natural Sciences, Department of Plant Physiology, Comenius University in Bratislava, Bratislava, Slovak Republic
| | - C. Jill Harrison
- School of Biological Sciences, University of Bristol, Bristol, UK
| | - Viktor Demko
- Faculty of Natural Sciences, Department of Plant Physiology, Comenius University in Bratislava, Bratislava, Slovak Republic
- Plant Science and Biodiversity Center, Slovak Academy of Science, Bratislava, Slovak Republic
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2
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Tang S, Qian J, Lu B, He Y, Liu Y, Xu K, Shen J. Adsorption and uptake of functionalized nanoplastics (NPs) by wetland plant (Sphagnum): A unique pathway for polystyrene-NPs reduction in non-vascular plants. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 950:175367. [PMID: 39127200 DOI: 10.1016/j.scitotenv.2024.175367] [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: 01/16/2024] [Revised: 07/22/2024] [Accepted: 08/05/2024] [Indexed: 08/12/2024]
Abstract
Wetlands are sources and sinks for nanoplastics (NPs), where adsorption and uptake by plants constitute a crucial pathway for NPs accumulation. This study found that Sphagnum exhibited a high potential (~89.75 %) to intercept NPs despite the lack of root systems and stomata. Two pathways for 100nm polystyrene NPs accumulation in Sphagnum were located: (i) Spiral interception and foliar adsorption. Efficient adsorption is credited to the micro/nano-interlocked leaf structure, which is porous, hydrophilic and rough. (ii) Intracellular enrichment through pores. Fluorescence tracking indicates pseudo-leaves (lateral > cephalic branches) as primary organs for internalization. Accumulation of differently functionalized NPs was characterized: PS-Naked-NPs (PS), PS-COOH-NPs (PC) and PS-NH2-NPs (PN) were all largely retained by pathway (i), while pathway (ii) mainly uptake PN and PC. Unlike PS aggregation in transparent cells, PC enrichment in chloroplast cells and PN in intercellular spaces reduced pigment content and fluorescence intensity. Further, the effects of the accumulated NPs on the ecological functions of Sphagnum were evaluated. NPs reduce carbon flux (assimilation rate by 57.78 %, and respiration rate by 33.50%), significantly decreasing biomass (PS = 13.12 %, PC = 26.48 %, PN = 35.23 %). However, toxicity threshold was around 10 μg/mL, environmental levels (≤1 μg/mL) barely affected Sphagnum. This study advances understanding of the behavior and fate of NPs in non-vascular plants, and provides new perspectives for developing Sphagnum substrates for NPs interception.
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Affiliation(s)
- Sijing Tang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
| | - Jin Qian
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China.
| | - Bianhe Lu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
| | - Yuxuan He
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
| | - Yin Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
| | - Kailin Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
| | - Junwei Shen
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, People's Republic of China; College of Environment, Hohai University, Nanjing 210098, People's Republic of China
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Hata Y, Ohtsuka J, Hiwatashi Y, Naramoto S, Kyozuka J. Cytokinin and ALOG proteins regulate pluripotent stem cell identity in the moss Physcomitrium patens. SCIENCE ADVANCES 2024; 10:eadq6082. [PMID: 39196946 PMCID: PMC11352904 DOI: 10.1126/sciadv.adq6082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Accepted: 07/23/2024] [Indexed: 08/30/2024]
Abstract
The shoot apical meristem (SAM) contains pluripotent stem cells that produce all the aerial parts of the plant. Stem cells undergo asymmetric cell divisions to self-renew and to produce differentiating cells. Our research focused on unraveling the mechanisms governing the specification of these two distinct cell fates following the stem cell division. For this purpose, we used the model organism Physcomitrium patens, which features a singular pluripotent stem cell known as the gametophore apical cell. We show that the activity of cytokinins, critical stem cell regulators, is restricted to the gametophore apical cell due to the specific localization of PpLOG, the enzyme responsible for cytokinin activation. In turn, PpTAW, which promotes differentiating cell identity of the merophyte, is excluded from the gametophore apical cell by the action of cytokinins. We propose a cytokinin-based model for the establishment of asymmetry in the pluripotent stem cell division.
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Affiliation(s)
- Yuki Hata
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan
| | - Juri Ohtsuka
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan
| | - Yuji Hiwatashi
- School of Food Industrial Sciences, Miyagi University, Sendai 982-0215, Japan
| | - Satoshi Naramoto
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan
- Department of Biological Sciences, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
| | - Junko Kyozuka
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8577, Japan
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Scarpella E. Leaf Vein Patterning. ANNUAL REVIEW OF PLANT BIOLOGY 2024; 75:377-398. [PMID: 38382907 DOI: 10.1146/annurev-arplant-062923-030348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Leaves form veins whose patterns vary from a single vein running the length of the leaf to networks of staggering complexity where huge numbers of veins connect to other veins at both ends. For the longest time, vein formation was thought to be controlled only by the polar, cell-to-cell transport of the plant hormone auxin; recent evidence suggests that is not so. Instead, it turns out that vein patterning features are best accounted for by a combination of polar auxin transport, facilitated auxin diffusion through plasmodesma intercellular channels, and auxin signal transduction-though the latter's precise contribution remains unclear. Equally unclear remain the sites of auxin production during leaf development, on which that vein patterning mechanism ought to depend. Finally, whether that vein patterning mechanism can account for the variety of vein arrangements found in nature remains unknown. Addressing those questions will be the exciting challenge of future research.
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Affiliation(s)
- Enrico Scarpella
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;
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5
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Arnoux-Courseaux M, Coudert Y. Re-examining meristems through the lens of evo-devo. TRENDS IN PLANT SCIENCE 2024; 29:413-427. [PMID: 38040554 DOI: 10.1016/j.tplants.2023.11.003] [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: 07/26/2023] [Revised: 10/25/2023] [Accepted: 11/03/2023] [Indexed: 12/03/2023]
Abstract
The concept of the meristem was introduced in 1858 to characterize multicellular, formative, and proliferative tissues that give rise to the entire plant body, based on observations of vascular plants. Although its original definition did not encompass bryophytes, this concept has been used and continuously refined over the past 165 years to describe the diverse apices of all land plants. Here, we re-examine this matter in light of recent evo-devo research and show that, despite displaying high anatomical diversity, land plant meristems are unified by shared genetic control. We also propose a modular view of meristem function and highlight multiple evolutionary mechanisms that are likely to have contributed to the assembly and diversification of the varied meristems during the course of plant evolution.
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Affiliation(s)
- Moïra Arnoux-Courseaux
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, INRIA, Lyon 69007, France; Laboratoire Physiologie Cellulaire et Végétale, Université Grenoble Alpes, CNRS, CEA, INRAE, IRIG-DBSCI-LPCV, 17 avenue des Martyrs, F-38054, Grenoble, France
| | - Yoan Coudert
- Laboratoire Reproduction et Développement des Plantes, Université de Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRA, INRIA, Lyon 69007, France.
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Mohanasundaram B, Palit S, Bhide AJ, Pala M, Rajoria K, Girigosavi P, Banerjee AK. PpSCARECROW1 (PpSCR1) regulates leaf blade and mid-vein development in Physcomitrium patens. PLANT MOLECULAR BIOLOGY 2024; 114:12. [PMID: 38324222 DOI: 10.1007/s11103-023-01398-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 12/11/2023] [Indexed: 02/08/2024]
Abstract
In plants, asymmetric cell divisions result in distinct cell fates forming large and small daughter cells, adding to the cellular diversity in an organ. SCARECROW (SCR), a GRAS domain-containing transcription factor controls asymmetric periclinal cell divisions in flowering plants by governing radial patterning of ground tissue in roots and cell proliferation in leaves. Though SCR homologs are present across land plant lineages, the current understanding of their role in cellular patterning and leaf development is mostly limited to flowering plants. Our phylogenetic analysis identified three SCR homologs in moss Physcomitrium patens, amongst which PpSCR1 showed highest expression in gametophores and its promoter activity was prominent at the mid-vein and the flanking leaf blade cells pointing towards its role in leaf development. Notably, out of the three SCR homologs, only the ppscr1 knock-out lines developed slender leaves with four times narrower leaf blade and three times thicker mid-vein. Detailed histology studies revealed that slender leaf phenotype is either due to the loss of anticlinal cell divisions or failure of periclinal division suppression in the leaf blade. RNA-Seq analyses revealed that genes responsible for cell division and differentiation are expressed differentially in the mutant. PpSCR1 overexpression lines exhibited significantly wider leaf lamina, further reconfirming the role in leaf development. Together, our data suggests that PpSCR1 is involved in the leaf blade and mid-vein development of moss and that its role in the regulation of cell division and proliferation is ancient and conserved among flowering plants and mosses.
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Affiliation(s)
- Boominathan Mohanasundaram
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
- Currently at Donald Danforth Plant Science Center, St. Louis, MO, USA
| | - Shirsa Palit
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
- Currently at Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, USA
| | - Amey J Bhide
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
| | - Madhusmita Pala
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
| | - Kanishka Rajoria
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
| | - Payal Girigosavi
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India
- Currently at National AIDS Research Institute, Pune, Maharashtra, India
| | - Anjan K Banerjee
- Indian Institute of Science Education and Research (IISER-Pune), Biology Division, Dr Homi Bhabha Road, Pune, 411008, Maharashtra, India.
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Zhang L, Sasaki-Sekimoto Y, Kosetsu K, Aoyama T, Murata T, Kabeya Y, Sato Y, Koshimizu S, Shimojima M, Ohta H, Hasebe M, Ishikawa M. An ABCB transporter regulates anisotropic cell expansion via cuticle deposition in the moss Physcomitrium patens. THE NEW PHYTOLOGIST 2024; 241:665-675. [PMID: 37865886 DOI: 10.1111/nph.19337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 09/29/2023] [Indexed: 10/23/2023]
Abstract
Anisotropic cell expansion is crucial for the morphogenesis of land plants, as cell migration is restricted by the rigid cell wall. The anisotropy of cell expansion is regulated by mechanisms acting on the deposition or modification of cell wall polysaccharides. Besides the polysaccharide components in the cell wall, a layer of hydrophobic cuticle covers the outer cell wall and is subjected to tensile stress that mechanically restricts cell expansion. However, the molecular machinery that deposits cuticle materials in the appropriate spatiotemporal manner to accommodate cell and tissue expansion remains elusive. Here, we report that PpABCB14, an ATP-binding cassette transporter in the moss Physcomitrium patens, regulates the anisotropy of cell expansion. PpABCB14 localized to expanding regions of leaf cells. Deletion of PpABCB14 resulted in impaired anisotropic cell expansion. Unexpectedly, the cuticle proper was reduced in the mutants, and the cuticular lipid components decreased. Moreover, induced PpABCB14 expression resulted in deformed leaf cells with increased cuticle lipid accumulation on the cell surface. Taken together, PpABCB14 regulates the anisotropy of cell expansion via cuticle deposition, revealing a regulatory mechanism for cell expansion in addition to the mechanisms acting on cell wall polysaccharides.
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Affiliation(s)
- Liechi Zhang
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
- School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, 444-8585, Japan
| | - Yuko Sasaki-Sekimoto
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, 226-8501, Japan
| | - Ken Kosetsu
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
| | - Tsuyoshi Aoyama
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
| | - Takashi Murata
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
- School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, 444-8585, Japan
| | - Yukiko Kabeya
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
| | - Yoshikatsu Sato
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
| | | | - Mie Shimojima
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, 226-8501, Japan
| | - Hiroyuki Ohta
- School of Life Science and Technology, Tokyo Institute of Technology, Yokohama, 226-8501, Japan
| | - Mitsuyasu Hasebe
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
- School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, 444-8585, Japan
| | - Masaki Ishikawa
- National Institute for Basic Biology, Okazaki, 444-8585, Japan
- School of Life Science, SOKENDAI (The Graduate University for Advanced Studies), Okazaki, 444-8585, Japan
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Organ Patterning at the Shoot Apical Meristem (SAM): The Potential Role of the Vascular System. Symmetry (Basel) 2023. [DOI: 10.3390/sym15020364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Auxin, which is transported in the outermost cell layer, is one of the major players involved in plant organ initiation and positioning at the shoot apical meristem (SAM). However, recent studies have recognized the role of putative internal signals as an important factor collaborating with the well-described superficial pathway of organogenesis regulation. Different internal signals have been proposed; however, their nature and transport route have not been precisely determined. Therefore, in this mini-review, we aimed to summarize the current knowledge regarding the auxin-dependent regulation of organ positioning at the SAM and to discuss the vascular system as a potential route for internal signals. In addition, as regular organ patterning is a universal phenomenon, we focus on the role of the vasculature in this process in the major lineages of land plants, i.e., bryophytes, lycophytes, ferns, gymnosperms, and angiosperms.
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Ge Y, Gao Y, Jiao Y, Wang Y. A conserved module in the formation of moss midribs and seed plant axillary meristems. SCIENCE ADVANCES 2022; 8:eadd7275. [PMID: 36399581 PMCID: PMC9674282 DOI: 10.1126/sciadv.add7275] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Different evolutionary lineages have evolved distinct characteristic body plans and anatomical structures, but their origins are largely elusive. For example, seed plants evolve axillary meristems to enable lateral branching. In moss, the phyllid (leaf) midrib containing specialized cells is responsible for water conduction and support. Midribs function like vascular tissues in flowering plants but may have risen from a different evolutionary path. Here, we demonstrate that midrib formation in the model moss Physcomitrium patens is regulated by orthologs of Arabidopsis LATERAL SUPPRESSOR (LAS), a key regulator of axillary meristem initiation. Midribs are missing in loss-of-function mutants, and ectopic formation of midrib-like structures is induced in overexpression lines. Furthermore, the PpLAS/AtLAS genes have conserved functions in the promotion of cell division in both lineages, which alleviates phenotypes in both Physcomitrium and Arabidopsis las mutants. Our results show that a conserved regulatory module is reused in divergent developmental programs, water-conducting and supporting tissues in moss, and axillary meristem initiation in seed plants.
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Affiliation(s)
- Yanhua Ge
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
| | - Yi Gao
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuling Jiao
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research (Beijing), Institute of Genetics and Developmental Biology, The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100101, China
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, Center for Quantitative Biology, School of Life Sciences, Peking University, Beijing 100871, China
| | - Ying Wang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
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Jiang S, Tian X, Huang X, Xin J, Yan H. Physcomitrium patens CAD1 has distinct roles in growth and resistance to biotic stress. BMC PLANT BIOLOGY 2022; 22:518. [PMID: 36344936 PMCID: PMC9641914 DOI: 10.1186/s12870-022-03892-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 10/19/2022] [Indexed: 06/07/2023]
Abstract
BACKGROUND Physcomitrium patens provides an evolutionary link between green algae and vascular plants. Although the genome of P. patens includes orthologs of all the core lignin biosynthetic enzymes, the occurrence of lignin in moss is very controversial. Besides, little information is available about the lignin enzymes in moss to date. For example, cinnamyl alcohol dehydrogenase (CAD) is a crucial enzyme that catalyzes the last step of the lignin biosynthetic pathway, suggesting an ideal way to study the evolutionary process. By investigating the functions of CAD in evolution, this study will elucidate the evolutionary roles of lignin-like in the early stage of land colonization. RESULTS CAD multigene family in P. patens is composed of four genes. The PpCADs contain a conserved glycine-rich domain to catalyze NADPH-dependent reduction to their corresponding alcohols, indicating that PpCADs have the potential to synthesize monolignols by bioinformatics analysis. Even though PpCAD1 could produce lignin in theory, no conventional monomer was detected in the cell wall or cytoplasm of PpCAD1_OE plants. However, the phenylpropanoids were promoted in PpCAD1_OE transformants to modify gametophore architecture and development, making the distribution of phyllids more scarcity and the moss colony more giant, possibly due to the enhanced expression of the AUX-IAA family. The transcripts of at least one gene encoding the enzyme in the lignin biosynthetic pathway were increased in PpCAD1_OE plants. In addition, the PpCAD1_OE gametophore inhibited the Botrytis cinerea assault mainly by enhanced phenylpropanoids in the cell wall instead of influencing transcripts of defense genes pathogenesis-related 10 (PR10) and nonexpresser of PR genes 1 (NPR1). Likewise, ectopic expression of PpCAD1 in Arabidopsis led to a significant increase in lignin content, exhibiting chunky roots, robust seedlings, advanced flowering, and efficient resistance against pathogens. CONCLUSION PpCAD occurs in more than one copy, suggesting functional divergence in the ancestral plant. PpCAD1 catalyzes monolignol biosynthesis and has homologous functions with vascular plants. Despite no detected conventional monolignol, the increased phenylpropanoids in the PpCAD1_OE gametophore, possibly intermediate metabolites in the lignin pathway, had conserved functions during the evolution of terrestrial plants. The results inferred that the lignin enzyme of the early non-vascular plant played roles in stem elongation and resistance against pathogens of P. patens during the conquest of land.
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Affiliation(s)
- Shan Jiang
- School of Life Sciences, Guizhou Normal University, 550001 Guiyang, China
- School of International Education, Guizhou Normal University, 550001 Guiyang, China
| | - Xu Tian
- School of Life Sciences, Guizhou Normal University, 550001 Guiyang, China
| | - Xiaolong Huang
- School of Life Sciences, Guizhou Normal University, 550001 Guiyang, China
- Key Laboratory of Plant Physiology and Development Regulation, Guizhou Normal University, 550001 Guiyang, China
- Key Laboratory of National Forestry and Grassland Administration on Bioaffiliationersity Conservation in Karst Mountainous Areas of Southwestern China, Guizhou Normal University, 550001 Guiyang, China
| | - Jiankang Xin
- School of Life Sciences, Guizhou Normal University, 550001 Guiyang, China
| | - Huiqing Yan
- School of Life Sciences, Guizhou Normal University, 550001 Guiyang, China
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