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Arico DS, Burachik NB, Wengier DL, Mazzella MA. Arabidopsis hypocotyl growth in darkness requires the phosphorylation of a microtubule-associated protein. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 118:1815-1831. [PMID: 38494883 DOI: 10.1111/tpj.16711] [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: 07/26/2023] [Revised: 02/23/2024] [Accepted: 02/28/2024] [Indexed: 03/19/2024]
Abstract
Rapid hypocotyl elongation allows buried seedlings to emerge, where light triggers de-etiolation and inhibits hypocotyl growth mainly by photoreceptors. Phosphorylation/dephosphorylation events regulate many aspects of plant development. Only recently we have begun to uncover the earliest phospho-signaling responders to light. Here, we reported a large-scale phosphoproteomic analysis and identified 20 proteins that changed their phosphorylation pattern following a 20 min light pulse compared to darkness. Microtubule-associated proteins were highly overrepresented in this group. Among them, we studied CIP7 (COP1-INTERACTING-PROTEIN 7), which presented microtubule (MT) localization in contrast to the previous description. An isoform of CIP7 phosphorylated at Serine915 was detected in etiolated seedlings but was undetectable after a light pulse in the presence of photoreceptors, while CIP7 transcript expression decays with long light exposure. The short hypocotyl phenotype and rearrangement of MTs in etiolated cip7 mutants are complemented by CIP7-YFP and the phospho-mimetic CIP7S915D-YFP, but not the phospho-null CIP7S915A-YFP suggesting that the phosphorylated S915CIP7 isoform promotes hypocotyl elongation through MT reorganization in darkness. Our evidence on Serine915 of CIP7 unveils phospho-regulation of MT-based processes during skotomorphogenic hypocotyl growth.
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Affiliation(s)
- Denise Soledad Arico
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular-Héctor Torres, Vuelta de obligado, 2490, Caba, Argentina
| | - Natalia B Burachik
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular-Héctor Torres, Vuelta de obligado, 2490, Caba, Argentina
| | - Diego Leonardo Wengier
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular-Héctor Torres, Vuelta de obligado, 2490, Caba, Argentina
| | - María Agustina Mazzella
- Instituto de Investigaciones en Ingeniería Genética y Biología Molecular-Héctor Torres, Vuelta de obligado, 2490, Caba, Argentina
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2
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Yue X, Su T, Xin X, Li P, Wang W, Yu Y, Zhang D, Zhao X, Wang J, Sun L, Jin G, Yu S, Zhang F. The Adaxial/Abaxial Patterning of Auxin and Auxin Gene in Leaf Veins Functions in Leafy Head Formation of Chinese Cabbage. FRONTIERS IN PLANT SCIENCE 2022; 13:918112. [PMID: 35755702 PMCID: PMC9224592 DOI: 10.3389/fpls.2022.918112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 05/17/2022] [Indexed: 06/15/2023]
Abstract
Leaf curling is an essential prerequisite for the formation of leafy heads in Chinese cabbage. However, the part or tissue that determines leaf curvature remains largely unclear. In this study, we first introduced the auxin-responsive marker DR5::GUS into the Chinese cabbage genome and visualized its expression during the farming season. We demonstrated that auxin response is adaxially/abaxially distributed in leaf veins. Together with the fact that leaf veins occupy considerable proportions of the Chinese cabbage leaf, we propose that leaf veins play a crucial supporting role as a framework for heading. Then, by combining analyses of QTL mapping and a time-course transcriptome from heading Chinese cabbage and non-heading pak choi during the farming season, we identified the auxin-related gene BrPIN5 as a strong candidate for leafy head formation. PIN5 displays an adaxial/abaxial expression pattern in leaf veins, similar to that of DR5::GUS, revealing an involvement of BrPIN5 in leafy head development. The association of BrPIN5 function with heading was further confirmed by its haplo-specificity to heading individuals in both a natural population and two segregating populations. We thus conclude that the adaxial/abaxial patterning of auxin and auxin genes in leaf veins functions in the formation of the leafy head in Chinese cabbage.
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Affiliation(s)
- Xiaozhen Yue
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
- Key Laboratory of the Vegetable Postharvest Treatment of Ministry of Agriculture, Beijing Key Laboratory of Fruits and Vegetable Storage and Processing, Institute of Agri-Food Processing and Nutrition (IAPN), Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Tongbing Su
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Xiaoyun Xin
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Peirong Li
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Weihong Wang
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Yangjun Yu
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Deshuang Zhang
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Xiuyun Zhao
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Jiao Wang
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
| | - Liling Sun
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
| | - Guihua Jin
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
| | - Shuancang Yu
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Fenglan Zhang
- Beijing Vegetable Research Center (BVRC), Beijing Academy of Agriculture and Forestry Science (BAAFS), Beijing, China
- National Engineering Research Center for Vegetables, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
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3
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Demirjian C, Razavi N, Desaint H, Lonjon F, Genin S, Roux F, Berthomé R, Vailleau F. Study of natural diversity in response to a key pathogenicity regulator of Ralstonia solanacearum reveals new susceptibility genes in Arabidopsis thaliana. MOLECULAR PLANT PATHOLOGY 2022; 23:321-338. [PMID: 34939305 PMCID: PMC8828461 DOI: 10.1111/mpp.13135] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 07/25/2021] [Accepted: 08/10/2021] [Indexed: 06/12/2023]
Abstract
Ralstonia solanacearum gram-negative phytopathogenic bacterium exerts its virulence through a type III secretion system (T3SS) that translocates type III effectors (T3Es) directly into the host cells. T3E secretion is finely controlled at the posttranslational level by helper proteins, T3SS control proteins, and type III chaperones. The HpaP protein, one of the type III secretion substrate specificity switch (T3S4) proteins, was previously highlighted as a virulence factor on Arabidopsis thaliana Col-0 accession. In this study, we set up a genome-wide association analysis to explore the natural diversity of response to the hpaP mutant of two A. thaliana mapping populations: a worldwide collection and a local population. Quantitative genetic variation revealed different genetic architectures in both mapping populations, with a global delayed response to the hpaP mutant compared to the GMI1000 wild-type strain. We have identified several quantitative trait loci (QTLs) associated with the hpaP mutant inoculation. The genes underlying these QTLs are involved in different and specific biological processes, some of which were demonstrated important for R. solanacearum virulence. We focused our study on four candidate genes, RKL1, IRE3, RACK1B, and PEX3, identified using the worldwide collection, and validated three of them as susceptibility factors. Our findings demonstrate that the study of the natural diversity of plant response to a R. solanacearum mutant in a key regulator of virulence is an original and powerful strategy to identify genes directly or indirectly targeted by the pathogen.
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Affiliation(s)
| | - Narjes Razavi
- LIPME, Université de ToulouseINRAECNRSCastanet‐TolosanFrance
| | - Henri Desaint
- LIPME, Université de ToulouseINRAECNRSCastanet‐TolosanFrance
- SYNGENTA SeedsSarriansFrance
| | - Fabien Lonjon
- LIPME, Université de ToulouseINRAECNRSCastanet‐TolosanFrance
- Present address:
Department of Cell & Systems BiologyUniversity of TorontoTorontoOntarioCanada
| | - Stéphane Genin
- LIPME, Université de ToulouseINRAECNRSCastanet‐TolosanFrance
| | - Fabrice Roux
- LIPME, Université de ToulouseINRAECNRSCastanet‐TolosanFrance
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4
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Li P, Lv S, Zhang D, Su T, Xin X, Wang W, Zhao X, Yu Y, Zhang Y, Yu S, Zhang F. The Carotenoid Esterification Gene BrPYP Controls Pale-Yellow Petal Color in Flowering Chinese Cabbage ( Brassica rapa L. subsp. parachinensis). FRONTIERS IN PLANT SCIENCE 2022; 13:844140. [PMID: 35592555 PMCID: PMC9111173 DOI: 10.3389/fpls.2022.844140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 02/14/2022] [Indexed: 05/13/2023]
Abstract
Carotenoid esterification plays indispensable roles in preventing degradation and maintaining the stability of carotenoids. Although the carotenoid biosynthetic pathway has been well characterized, the molecular mechanisms underlying carotenoid esterification, especially in floral organs, remain poorly understood. In this study, we identified a natural mutant flowering Chinese cabbage (Caixin, Brassica rapa L. subsp. chinensis var. parachinensis) with visually distinguishable pale-yellow petals controlled by a single recessive gene. Transmission electron microscopy (TEM) demonstrated that the chromoplasts in the yellow petals were surrounded by more fully developed plastoglobules compared to the pale-yellow mutant. Carotenoid analyses further revealed that, compared to the pale-yellow petals, the yellow petals contained high levels of esterified carotenoids, including lutein caprate, violaxanthin dilaurate, violaxanthin-myristate-laurate, 5,6epoxy-luttein dilaurate, lutein dilaurate, and lutein laurate. Based on bulked segregation analysis and fine mapping, we subsequently identified the critical role of a phytyl ester synthase 2 protein (PALE YELLOW PETAL, BrPYP) in regulating carotenoid pigmentation in flowering Chinese cabbage petals. Compared to the yellow wild-type, a 1,148 bp deletion was identified in the promoter region of BrPYP in the pale-yellow mutant, resulting in down-regulated expression. Transgenic Arabidopsis plants harboring beta-glucuronidase (GUS) driven by yellow (BrPYP Y ::GUS) and pale-yellow type (BrPYP PY ::GUS) promoters were subsequently constructed, revealing stronger expression of BrPYP Y ::GUS both in the leaves and petals. Furthermore, virus-induced gene silencing of BrPYP significantly altered petal color from yellow to pale yellow. These findings demonstrate the molecular mechanism of carotenoid esterification, suggesting a role of phytyl ester synthase in carotenoid biosynthesis of flowering Chinese cabbage.
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Affiliation(s)
- Peirong Li
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Sirui Lv
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, China
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, China
| | - Deshuang Zhang
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Tongbing Su
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Xiaoyun Xin
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Weihong Wang
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Xiuyun Zhao
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Yangjun Yu
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
| | - Yaowei Zhang
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Northeast Region), Ministry of Agriculture, Harbin, China
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, China
| | - Shuancang Yu
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
- *Correspondence: Shuancang Yu,
| | - Fenglan Zhang
- Beijing Vegetable Research Center, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (North China), Ministry of Agriculture, Beijing, China
- Beijing Key Laboratory of Vegetable Germplasm Improvement, Beijing, China
- Fenglan Zhang,
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5
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Wang J, Huang X, Ge H, Wang Y, Chen W, Zheng L, Huang C, Yang H, Li L, Sui N, Wang Y, Zhang Y, Lu D, Fang L, Xu W, Jiang Y, Huang F, Wang Y. The Quantitative Proteome Atlas of a Model Cyanobacterium. J Genet Genomics 2021; 49:96-108. [PMID: 34775074 DOI: 10.1016/j.jgg.2021.09.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 09/23/2021] [Accepted: 09/25/2021] [Indexed: 12/17/2022]
Abstract
Cyanobacteria are a group of oxygenic photosynthetic bacteria with great potentials in biotechnological applications and advantages as models for photosynthesis research. The subcellular locations of the majority of proteins in any cyanobacteria remain undetermined, representing a major challenge in using cyanobacteria for both basic and industrial researches. Here, using label free quantitative proteomics we mapped 2027 proteins of Synechocystis sp. PCC6803, a model cyanobacterium, to different subcellular compartments, and generated a proteome atlas with such information. The atlas leads to numerous unexpected but important findings, including the predominant localization of the histidine kinases Hik33 and Hik27 on the thylakoid but not the plasma membrane. Such information completely changes the concept regarding how the two kinases are activated. Together, the atlas provides subcellular localization information for nearly 60% proteome of a model cyanobacterium, and will serve as an important resource for the cyanobacterial research community.
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Affiliation(s)
- Jinlong Wang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; School of Life Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China
| | - Xiahe Huang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Haitao Ge
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yan Wang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Weiyang Chen
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Limin Zheng
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chengcheng Huang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haomeng Yang
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Bejing 100093, China
| | - Lingyu Li
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Bejing 100093, China
| | - Na Sui
- Shandong Provincial Key Laboratory of Plant Stress, College of Life Science, Shandong Normal University, Jinan 250014, China
| | - Yu Wang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yuanya Zhang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Dandan Lu
- State Key Laboratory of Crop Stress Adaptation and Improvement, School of Life Sciences, Henan University, Kaifeng 475004, China
| | - Longfa Fang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wu Xu
- Department of Chemistry, University of Louisiana at Lafayette, Lafayette, LA 70504, USA
| | - Yuqiang Jiang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Fang Huang
- Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Bejing 100093, China.
| | - Yingchun Wang
- State Key Laboratory of Molecular Developmental Biology, The Innovative Academy of Seed Design, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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6
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Song L, Wang Y, Guo Z, Lam SM, Shui G, Cheng Y. NCP2/RHD4/SAC7, SAC6 and SAC8 phosphoinositide phosphatases are required for PtdIns4P and PtdIns(4,5)P2 homeostasis and Arabidopsis development. THE NEW PHYTOLOGIST 2021; 231:713-725. [PMID: 33876422 DOI: 10.1111/nph.17402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 04/08/2021] [Indexed: 06/12/2023]
Abstract
Phosphoinositides play important roles in plant growth and development. Several SAC domain phosphoinositide phosphatases have been reported to be important for plant development. Here, we show functional analysis of SUPPRESSOR OF ACTIN 6 (SAC6) to SAC8 in Arabidopsis, a subfamily of phosphoinositide phosphatases containing SAC-domain and two transmembrane motifs. We isolated an Arabidopsis mutant ncp2 that lacked cotyledons in seedling and embryo in pid, a background defective in auxin signaling and transport. NCP2 encodes RHD4/SAC7 phosphoinositide phosphatase. SAC6, SAC7 and SAC8 exhibit overlapping and specific expression patterns in seedling and embryo. The sac6 sac7 embryos either fail to develop into seeds, or have three or four cotyledons. The embryo development of sac7 sac8 and sac6 sac7 sac8 mutants is significantly delayed or lethal, and the seedlings are arrested at early stages. Auxin maxima are decreased in double and triple sac mutants. The contents of PtdIns4P and PtdIns(4,5)P2 in sac6 sac7 and sac7 sac8 mutants are dramatically increased. Protein trafficking of the plasma membrane (PM)-localized protein PIN1 and PIN2 from trans-Golgi network/early endosome back to PM is delayed in sac7 sac8 mutants. These results indicate that SAC6-SAC8 are essential for maintaining homeostasis of PtdIns4P and PtdIns(4,5)P2, and auxin-mediated development in Arabidopsis.
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Affiliation(s)
- Lizhen Song
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Yanning Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhiai Guo
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Sin M Lam
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Guanghou Shui
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Youfa Cheng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, 100101, China
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7
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Liu J, Wang Y, Cheng Y. The ESCRT-I components VPS28A and VPS28B are essential for auxin-mediated plant development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 104:1617-1634. [PMID: 33058303 DOI: 10.1111/tpj.15024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 09/27/2020] [Accepted: 10/02/2020] [Indexed: 06/11/2023]
Abstract
The highly conserved endosomal sorting complex required for transport (ESCRT) pathway plays critical roles in endosomal sorting of ubiquitinated plasma membrane proteins for degradation. However, the functions of many components of the ESCRT machinery in plants remain unsolved. Here we show that the ESCRT-I subunits VPS28A and VPS28B are functionally redundant and required for embryonic development in Arabidopsis. We conducted a screen for genetic enhancers of pid, which is defective in auxin signaling and transport. We isolated a no--cotyledon in pid 104 (ncp104) mutant, which failed to develop cotyledons in a pid background. We discovered that ncp104 was a unique recessive gain-of-function allele of vps28a. VPS28A and VPS28B were expressed during embryogenesis and the proteins were localized to the trans-Golgi network/early endosome and post-Golgi/endosomal compartments, consistent with their functions in endosomal sorting and embryogenesis. The single vps28a and vps28b loss-of-function mutants did not display obvious developmental defects, but their double mutants showed abnormal cell division patterns and were arrested at the globular embryo stage. The vps28a vps28b double mutants showed altered auxin responses, disrupted PIN1-GFP expression patterns, and abnormal PIN1-GFP accumulation in small aberrant vacuoles. The ncp104 mutation may cause the VPS28A protein to become unstable and/or toxic. Taken together, our findings demonstrate that the ESCRT-I components VPS28A and VPS28B redundantly play essential roles in vacuole formation, endosomal sorting of plasma membrane proteins, and auxin-mediated plant development.
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Affiliation(s)
- Jianyang Liu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yanning Wang
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Youfa Cheng
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
- Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, 100101, China
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