1
|
Pham NN, Wu YH, Dai TA, Tu J, Liang RM, Hsieh HY, Chang CW, Hu YC. Auto-inducible synthetic pathway in E. coli enhanced sustainable indigo production from glucose. Metab Eng 2024; 85:14-25. [PMID: 38971492 DOI: 10.1016/j.ymben.2024.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 06/10/2024] [Accepted: 07/03/2024] [Indexed: 07/08/2024]
Abstract
Indigo is widely used in textile industries for denim garments dyeing and is mainly produced by chemical synthesis which, however, raises environmental sustainability issues. Bio-indigo may be produced by fermentation of metabolically engineering bacteria, but current methods are economically incompetent due to low titer and the need for an inducer. To address these problems, we first characterized several synthetic promoters in E. coli and demonstrated the feasibility of inducer-free indigo production from tryptophan using the inducer-free promoter. We next coupled the tryptophan-to-indigo and glucose-to-tryptophan pathways to generate a de novo glucose-to-indigo pathway. By rational design and combinatorial screening, we identified the optimal promoter-gene combinations, which underscored the importance of promoter choice and expression levels of pathway genes. We thus created a new E. coli strain that exploited an indole pathway to enhance the indigo titer to 123 mg/L. We further assessed a panel of heterologous tryptophan synthase homologs and identified a plant indole lyase (TaIGL), which along with modified pathway design, improved the indigo titer to 235 mg/L while reducing the tryptophan byproduct accumulation. The optimal E. coli strain expressed 8 genes essential for rewiring carbon flux from glucose to indole and then to indigo: mFMO, ppsA, tktA, trpD, trpC, TaIGL and feedback-resistant aroG and trpE. Fed-batch fermentation in a 3-L bioreactor with glucose feeding further increased the indigo titer (≈965 mg/L) and total quantity (≈2183 mg) at 72 h. This new synthetic glucose-to-indigo pathway enables high-titer indigo production without the need of inducer and holds promise for bio-indigo production.
Collapse
Affiliation(s)
- Nam Ngoc Pham
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Yi-Hsiu Wu
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Ting-An Dai
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Jui Tu
- Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan
| | - Ruei-Ming Liang
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Hsin-Yun Hsieh
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Chin-Wei Chang
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Yu-Chen Hu
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan; Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan.
| |
Collapse
|
2
|
Yasmin F, Cowie AE, Zerbe P. Understanding the chemical language mediating maize immunity and environmental adaptation. THE NEW PHYTOLOGIST 2024; 243:2093-2101. [PMID: 39049575 DOI: 10.1111/nph.20000] [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: 05/03/2024] [Accepted: 07/10/2024] [Indexed: 07/27/2024]
Abstract
Diverse networks of specialized metabolites promote plant fitness by mediating beneficial and antagonistic environmental interactions. In maize (Zea mays), constitutive and dynamically formed cocktails of terpenoids, benzoxazinoids, oxylipins, and phenylpropanoids contribute to plant defense and ecological adaptation. Recent research has highlighted the multifunctional nature of many specialized metabolites, serving not only as elaborate chemical defenses that safeguard against biotic and abiotic stress but also as regulators in adaptive developmental processes and microbiome interactions. Great strides have also been made in identifying the modular pathway networks that drive maize chemical diversity. Translating this knowledge into strategies for enhancing stress resilience traits has the potential to address climate-driven yield losses in one of the world's major food, feed, and bioenergy crops.
Collapse
Affiliation(s)
- Farida Yasmin
- Department of Plant Biology, University of California-Davis, Davis, CA, 95616, USA
| | - Anna E Cowie
- Department of Plant Biology, University of California-Davis, Davis, CA, 95616, USA
| | - Philipp Zerbe
- Department of Plant Biology, University of California-Davis, Davis, CA, 95616, USA
| |
Collapse
|
3
|
Zhang Y, Gong Z, Zhu Z, Sun J, Guo W, Zhang J, Ding P, Liu M, Gao Z. Identification of floral aroma components and molecular regulation mechanism of floral aroma formation in Phalaenopsis. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2024. [PMID: 39007364 DOI: 10.1002/jsfa.13742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 06/19/2024] [Accepted: 06/22/2024] [Indexed: 07/16/2024]
Abstract
BACKGROUND Most Phalaenopsis cultivars have almost no aroma, with a few exceptions. Phalaenopsis presents significant challenges in fragrance breeding due to its weak aroma and low fertility. It is therefore necessary to identify the aroma components and key regulatory genes in Phalaenopsis cultivars like 'Orange Beauty', 'Brother Sara Gold', 'Purple Martin', 'H026', 'SK16', 'SX098', and 'SH51', to improve the aroma of the common Phalaenopsis. RESULTS Floral aroma components were tested on nine Phalaenopsis species, using smell identification and headspace gas chromatography-mass spectrometry. The result showed that alcohols, esters, and alkenes were the key specific components in the different species and cultivar aromas and the aroma intensity and component content of cultivars with different colors were different. The main components of the floral aromas in Phalaenopsis were alcohols (including eucalyptol, linalool, citronellol, and 1-hexanol), esters (including hexyl acetate, leaf acetate, and dibutyl phthalate), alkenes (including pinene and sabinene) and arenes (like fluorene). The transcriptome of flowers in the bud stage and bloom stage of P. 'SH51' was sequenced and 5999 differentially expressed genes were obtained. The contributions of the phenylpropionic acid/phenyl ring compound and the terpene compound to the aroma were greater. Sixteen genes related to phalaenopsis aroma were found. TC4M, PAL, CAD6, and HR were related to phenylpropanoid synthesis pathway. SLS, TS10, and P450 were related to the synthesis pathway of terpenes. TS10 and YUCCA 10 were involved in tryptophan metabolism. CONCLUSION This is the first report on the floral aroma components and regulatory genes in Phalaenopsis. The proposed method and research data can provide technical support for Phalaenopsis breeding. © 2024 Society of Chemical Industry.
Collapse
Affiliation(s)
- Yingjie Zhang
- Yantai Academy of Agricultural Sciences, Yantai, China
- Nanjing Agricultural University, Nanjing, China
| | - Zihui Gong
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Zhiqi Zhu
- Laizhou Hongshun plum planting technology Co., LTD, Yantai, China
| | - Jixia Sun
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Wenjiao Guo
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Jingwei Zhang
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Pengsong Ding
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Minxiao Liu
- Yantai Academy of Agricultural Sciences, Yantai, China
| | - Zhihong Gao
- Nanjing Agricultural University, Nanjing, China
| |
Collapse
|
4
|
Lin YH, Silven JJM, Wybouw N, Fandino RA, Dekker HL, Vogel H, Wu YL, de Koster C, Große-Wilde E, Haring MA, Schuurink RC, Allmann S. A salivary GMC oxidoreductase of Manduca sexta re-arranges the green leaf volatile profile of its host plant. Nat Commun 2023; 14:3666. [PMID: 37380635 DOI: 10.1038/s41467-023-39353-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/08/2023] [Indexed: 06/30/2023] Open
Abstract
Green leaf volatiles (GLVs) are short-chain oxylipins that are emitted from plants in response to stress. Previous studies have shown that oral secretions (OS) of the tobacco hornworm Manduca sexta, introduced into plant wounds during feeding, catalyze the re-arrangement of GLVs from Z-3- to E-2-isomers. This change in the volatile signal however is bittersweet for the insect as it can be used by their natural enemies, as a prey location cue. Here we show that (3Z):(2E)-hexenal isomerase (Hi-1) in M. sexta's OS catalyzes the conversion of the GLV Z-3-hexenal to E-2-hexenal. Hi-1 mutants that were raised on a GLV-free diet showed developmental disorders, indicating that Hi-1 also metabolizes other substrates important for the insect's development. Phylogenetic analysis placed Hi-1 within the GMCβ-subfamily and showed that Hi-1 homologs from other lepidopterans could catalyze similar reactions. Our results indicate that Hi-1 not only modulates the plant's GLV-bouquet but also functions in insect development.
Collapse
Affiliation(s)
- Yu-Hsien Lin
- Green Life Sciences Research Cluster, Department of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Juliette J M Silven
- Green Life Sciences Research Cluster, Department of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Nicky Wybouw
- Terrestrial Ecology Unit, Department of Biology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Richard A Fandino
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Jena, Germany
- Department of Ecology & Evolutionary Biology, Cornell University, Ithaca, NY, US
| | - Henk L Dekker
- Laboratory for Mass Spectrometry of Biomolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Heiko Vogel
- Department of Insect Symbiosis, Max Planck Institute for Chemical Ecology, Jena, Germany
| | - Yueh-Lung Wu
- Department of Entomology, National Taiwan University, Taipei, Taiwan
| | - Chris de Koster
- Laboratory for Mass Spectrometry of Biomolecules, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Ewald Große-Wilde
- Department of Evolutionary Neuroethology, Max Planck Institute for Chemical Ecology, Jena, Germany
- EXTEMIT-K, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, 16500, Prague, Czech Republic
| | - Michel A Haring
- Green Life Sciences Research Cluster, Department of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Robert C Schuurink
- Green Life Sciences Research Cluster, Department of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Silke Allmann
- Green Life Sciences Research Cluster, Department of Plant Physiology, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands.
| |
Collapse
|
5
|
Genetic Variation, DIMBOA Accumulation, and Candidate Gene Identification in Maize Multiple Insect-Resistance. Int J Mol Sci 2023; 24:ijms24032138. [PMID: 36768464 PMCID: PMC9916695 DOI: 10.3390/ijms24032138] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Revised: 01/12/2023] [Accepted: 01/15/2023] [Indexed: 01/25/2023] Open
Abstract
Maize seedlings contain high amounts of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), and the effect of DIMBOA is directly associated with multiple insect-resistance against insect pests such as Asian corn borer and corn leaf aphids. Although numerous genetic loci for multiple insect-resistant traits have been identified, little is known about genetic controls regarding DIMBOA content. In this study, the best linear unbiased prediction (BLUP) values of DIMBOA content in two ecological environments across 310 maize inbred lines were calculated; and their phenotypic data and BLUP values were used for marker-trait association analysis. We identified nine SSRs that were significantly associated with DIMBOA content, which explained 4.30-20.04% of the phenotypic variation. Combined with 47 original genetic loci from previous studies, we detected 19 hot loci and approximately 11 hot loci (in Bin 1.04, Bin 2.00-2.01, Bin 2.03-2.04, Bin 4.00-4.03, Bin 5.03, Bin 5.05-5.07, Bin 8.01-8.03, Bin 8.04-8.05, Bin 8.06, Bin 9.01, and Bin 10.04 regions) supported pleiotropy for their association with two or more insect-resistant traits. Within the 19 hot loci, we identified 49 candidate genes, including 12 controlling DIMBOA biosynthesis, 6 involved in sugar metabolism/homeostasis, 2 regulating peroxidases activity, 21 associated with growth and development [(auxin-upregulated RNAs (SAUR) family member and v-myb avian myeloblastosis viral oncogene homolog (MYB)], and 7 involved in several key enzyme activities (lipoxygenase, cysteine protease, restriction endonuclease, and ubiquitin-conjugating enzyme). The synergy and antagonism interactions among these genes formed the complex defense mechanisms induced by multiple insect pests. Moreover, sufficient genetic variation was reported for DIMBOA performance and SSR markers in the 310 tested maize inbred lines, and 3 highly (DIMBOA content was 402.74-528.88 μg g-1 FW) and 15 moderate (DIMBOA content was 312.92-426.56 μg g-1 FW) insect-resistant genotypes were major enriched in the Reid group. These insect-resistant inbred lines can be used as parents in maize breeding programs to develop new varieties.
Collapse
|
6
|
Li Y, Tang J, Qi Y, Yang F, Su X, Fu J, Han X, He C, Xu Y, Zhan K, Xia H, Wu J, Wang L. Elevating herbivore-induced JA-Ile enhances potato resistance to the polyphagous beet armyworm but not to the oligophagous potato tuber moth. PEST MANAGEMENT SCIENCE 2023; 79:357-367. [PMID: 36176057 DOI: 10.1002/ps.7205] [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: 07/07/2022] [Revised: 08/23/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND The oligophagous potato tuber moth (PTM), Phthorimaea operculella, and the polyphagous beet armyworm (BAW), Spodoptera exigua, are two destructive pests of potato, and infestations can lead to serious reduction in potato yield. However, potato plant responses to the two herbivories are only poorly understood. Endogenous jasmonoyl-isoleucine (JA-Ile) is a signal responsible for the induction of plant anti-herbivore defenses. Elevation of JA-Ile by blocking its catabolism is considered to be an effective and sustainable approach to enhance plant resistance to insect pests. However, it is not clear whether this approach can enhance potato resistance to PTM and BAW. RESULTS We demonstrated that the transcriptional changes induced by simulated PTM and BAW feeding overlap to a large extent, and that 81.5% of the PTM- and 90.5% of the BAW-responsive genes were commonly regulated. We also generated potato transgenic lines, irStCYP94B3s, in which the three JA-Ile hydroxylases were all simultaneously silenced. These lines exhibited enhanced resistance only to BAW, but not to PTM, although levels of JA-Ile and its downstream induced defensive chemicals, including caffeoylputrescine, dicaffeoylspermidine, lyciumoside II, and the nicotianosides I, II, and VII, were all present at higher levels in PTM-infested than in BAW-infested irStCYP94B3s lines. CONCLUSION Our results provide support for the hypothesis that StCYP94B3 genes are able to act as potential targets for the control of polyphagous insect pests in potato, and reveal that the oligophagous PTM has evolved an effective mechanism to cope with JA-Ile-induced anti-herbivore defenses. © 2022 Society of Chemical Industry.
Collapse
Affiliation(s)
- Yi Li
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- College of Life Science, Shaanxi Normal University, Xi'an, China
| | - Jinxiang Tang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Yuechen Qi
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- School of Ecology and Environmental Science, Yunnan University, Kunming, China
| | - Fei Yang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Xiaohang Su
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jun Fu
- Yunnan State Farms Zhaotong Agricultural Investment Co., Ltd, Zhaotong, China
| | - Xiaonv Han
- Xuanwei Seed Potato Research and Development Center, Xuanwei, China
| | - Caihua He
- Xuanwei Seed Potato Research and Development Center, Xuanwei, China
| | - Youxian Xu
- Xuanwei Seed Potato Research and Development Center, Xuanwei, China
| | - Kang Zhan
- Xuanwei Seed Potato Research and Development Center, Xuanwei, China
| | - Haibin Xia
- College of Life Science, Shaanxi Normal University, Xi'an, China
| | - Jinsong Wu
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Lei Wang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| |
Collapse
|
7
|
Song S, Wood TK. Manipulating indole symbiont signalling. ENVIRONMENTAL MICROBIOLOGY REPORTS 2022; 14:691-696. [PMID: 35667868 DOI: 10.1111/1758-2229.13100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Affiliation(s)
- Sooyeon Song
- Department of Animal Science, Jeonbuk National University, Jeonju-si, Jeollabuk-do, Republic of Korea
- Agricultural Convergence Technology, Jeonbuk National University, Jeonju-si, Jeollabuk-do, Republic of Korea
| | - Thomas K Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, USA
| |
Collapse
|
8
|
Tang HV, Berryman DL, Mendoza J, Yactayo-Chang JP, Li QB, Christensen SA, Hunter CT, Best N, Soubeyrand E, Akhtar TA, Basset GJ, Block AK. Dedicated farnesyl diphosphate synthases circumvent isoprenoid-derived growth-defense tradeoffs in Zea mays. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2022; 112:207-220. [PMID: 35960639 DOI: 10.1111/tpj.15941] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 08/10/2022] [Indexed: 06/15/2023]
Abstract
Zea mays (maize) makes phytoalexins such as sesquiterpenoid zealexins, to combat invading pathogens. Zealexins are produced from farnesyl diphosphate in microgram per gram fresh weight quantities. As farnesyl diphosphate is also a precursor for many compounds essential for plant growth, the question arises as to how Z. mays produces high levels of zealexins without negatively affecting vital plant systems. To examine if specific pools of farnesyl diphosphate are made for zealexin synthesis we made CRISPR/Cas9 knockouts of each of the three farnesyl diphosphate synthases (FPS) in Z. mays and examined the resultant impacts on different farnesyl diphosphate-derived metabolites. We found that FPS3 (GRMZM2G098569) produced most of the farnesyl diphosphate for zealexins, while FPS1 (GRMZM2G168681) made most of the farnesyl diphosphate for the vital respiratory co-factor ubiquinone. Indeed, fps1 mutants had strong developmental phenotypes such as reduced stature and development of chlorosis. The replication and evolution of the fps gene family in Z. mays enabled it to produce dedicated FPSs for developmentally related ubiquinone production (FPS1) or defense-related zealexin production (FPS3). This partitioning of farnesyl diphosphate production between growth and defense could contribute to the ability of Z. mays to produce high levels of phytoalexins without negatively impacting its growth.
Collapse
Affiliation(s)
- Hoang V Tang
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - David L Berryman
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
- Department of Horticultural Sciences, University of Florida, Gainesville, FL, USA
| | - Jorrel Mendoza
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - Jessica P Yactayo-Chang
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - Qin-Bao Li
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - Shawn A Christensen
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - Charles T Hunter
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| | - Norman Best
- Plant Genetics Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Columbia, MO, USA
| | - Eric Soubeyrand
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada
| | - Tariq A Akhtar
- Molecular and Cellular Biology Department, University of Guelph, Guelph, ON, Canada
| | - Gilles J Basset
- Department of Horticultural Sciences, University of Florida, Gainesville, FL, USA
| | - Anna K Block
- Chemistry Research Unit, U.S. Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, USA
| |
Collapse
|
9
|
Yu J, Tu X, Huang AC. Functions and biosynthesis of plant signaling metabolites mediating plant-microbe interactions. Nat Prod Rep 2022; 39:1393-1422. [PMID: 35766105 DOI: 10.1039/d2np00010e] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Covering: 2015-2022Plants and microbes have coevolved since their appearance, and their interactions, to some extent, define plant health. A reasonable fraction of small molecules plants produced are involved in mediating plant-microbe interactions, yet their functions and biosynthesis remain fragmented. The identification of these compounds and their biosynthetic genes will open up avenues for plant fitness improvement by manipulating metabolite-mediated plant-microbe interactions. Herein, we integrate the current knowledge on their chemical structures, bioactivities, and biosynthesis with the view of providing a high-level overview on their biosynthetic origins and evolutionary trajectory, and pinpointing the yet unknown and key enzymatic steps in diverse biosynthetic pathways. We further discuss the theoretical basis and prospects for directing plant signaling metabolite biosynthesis for microbe-aided plant health improvement in the future.
Collapse
Affiliation(s)
- Jingwei Yu
- Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, SUSTech-PKU Institute of Plant and Food Science, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
| | - Xingzhao Tu
- Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, SUSTech-PKU Institute of Plant and Food Science, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
| | - Ancheng C Huang
- Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes, SUSTech-PKU Institute of Plant and Food Science, Department of Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
| |
Collapse
|
10
|
New molecules in plant defence against pathogens. Essays Biochem 2022; 66:683-693. [PMID: 35642866 DOI: 10.1042/ebc20210076] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 04/14/2022] [Accepted: 05/09/2022] [Indexed: 12/12/2022]
Abstract
Plants host a multipart immune signalling network to ward off pathogens. Pathogen attack upon plant tissues can often lead to an amplified state of (induced) defence against subsequent infections in distal tissues; this is known as systemic acquired resistance (SAR). The interaction of plants with beneficial microbes of the rhizosphere microbiome can also lead to an induced resistance in above-ground plant tissues, known as induced systemic resistance. Second messengers such as calcium (Ca2+), reactive oxygen species (ROS), and nitric oxide (NO) are necessary for cell-to-cell signal propagation during SAR and show emergent roles in the mediation of other SAR metabolites. These include the lysine-derived signals pipecolic acid (Pip) and N-hydroxypipecolic acid (NHP), which are key signalling metabolites in SAR. Emerging evidence additionally pinpoints plant volatiles as modulators of defence signalling within and between plants. Plant volatile organic compounds (VOCs) such as monoterpenes can promote SAR by functioning through ROS. Furthermore, plant-derived and additionally also microbial VOCs can target both salicylic acid and jasmonic acid signalling pathways in plants and modulate defence against pathogens. In this review, an overview of recent findings in induced defence signalling, with a particular focus on newer signalling molecules and how they integrate into these networks is discussed.
Collapse
|
11
|
Ferrer L, Mindt M, Suarez-Diez M, Jilg T, Zagorščak M, Lee JH, Gruden K, Wendisch VF, Cankar K. Fermentative Indole Production via Bacterial Tryptophan Synthase Alpha Subunit and Plant Indole-3-Glycerol Phosphate Lyase Enzymes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:5634-5645. [PMID: 35500281 PMCID: PMC9100643 DOI: 10.1021/acs.jafc.2c01042] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 04/14/2022] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
Indole is produced in nature by diverse organisms and exhibits a characteristic odor described as animal, fecal, and floral. In addition, it contributes to the flavor in foods, and it is applied in the fragrance and flavor industry. In nature, indole is synthesized either from tryptophan by bacterial tryptophanases (TNAs) or from indole-3-glycerol phosphate (IGP) by plant indole-3-glycerol phosphate lyases (IGLs). While it is widely accepted that the tryptophan synthase α-subunit (TSA) has intrinsically low IGL activity in the absence of the tryptophan synthase β-subunit, in this study, we show that Corynebacterium glutamicum TSA functions as a bona fide IGL and can support fermentative indole production in strains providing IGP. By bioprospecting additional bacterial TSAs and plant IGLs that function as bona fide IGLs were identified. Capturing indole in an overlay enabled indole production to titers of about 0.7 g L-1 in fermentations using C. glutamicum strains expressing either the endogenous TSA gene or the IGL gene from wheat.
Collapse
Affiliation(s)
- Lenny Ferrer
- Genetics
of Prokaryotes, Faculty of Biology & CeBiTec, Bielefeld University, 33615 Bielefeld, Germany
| | - Melanie Mindt
- Wageningen
Plant Research, Wageningen University &
Research, 6708PB Wageningen, The Netherlands
- Axxence
Aromatic GmbH, 46446 Emmerich am Rhein, Germany
| | - Maria Suarez-Diez
- Laboratory
of Systems and Synthetic Biology, Wageningen
University & Research, 6708WE Wageningen, The Netherlands
| | - Tatjana Jilg
- Genetics
of Prokaryotes, Faculty of Biology & CeBiTec, Bielefeld University, 33615 Bielefeld, Germany
| | - Maja Zagorščak
- Department
of Biotechnology and Systems Biology, National
Institute of Biology, 1000 Ljubljana, Slovenia
| | - Jin-Ho Lee
- Department
of Food Science & Biotechnology, Kyungsung
University, 608-736 Busan, Republic of Korea
| | - Kristina Gruden
- Department
of Biotechnology and Systems Biology, National
Institute of Biology, 1000 Ljubljana, Slovenia
| | - Volker F. Wendisch
- Genetics
of Prokaryotes, Faculty of Biology & CeBiTec, Bielefeld University, 33615 Bielefeld, Germany
| | - Katarina Cankar
- Wageningen
Plant Research, Wageningen University &
Research, 6708PB Wageningen, The Netherlands
| |
Collapse
|
12
|
Guo M, Ren X, Liu Y, Wang G. An Odorant Receptor from the Proboscis of the Cotton Bollworm Helicoverpa armigera (Lepidoptera: Noctuidae) Narrowly Tuned to Indole. INSECTS 2022; 13:insects13040385. [PMID: 35447827 PMCID: PMC9033110 DOI: 10.3390/insects13040385] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 04/09/2022] [Accepted: 04/11/2022] [Indexed: 01/18/2023]
Abstract
Simple Summary Odorant receptors (ORs) are at the core of the high-efficiency and sensitive olfactory system in insects. The expression and specific function of ORs largely contribute to the habits and speciation of one species. Although being predominantly expressed in the antennae, ORs in non-olfactory organs are suggested to have particular roles in promoting the reproduction or host fitness of insects. Our previous work has identified four ORs in the mouthpart organs of Helicoverpa armigera. Here, we amplified the full-length sequences of HarmORs from the proboscis. Further functional characterization suggested that HarmOR30 narrowly tuned to indole, the vital nitrogen-containing compounds that mediate tritrophic interactions. Our study deepens the insight into the olfactory perception of H. armigera, and explored a candidate functional receptor target for studying the interaction between insects and their plant hosts. Abstract Helicoverpa armigera is a serious agricultural pest with polyphagous diets, widespread distribution, and causing severe damage. Among sixty-five candidate ORs in H. armigera, the co-receptor HarmOrco and three specific ORs with partial sequences were identified to be expressed in the proboscis by our previous work, whereas their exact function is not known yet. In this study, we first confirmed the expression of these ORs in the proboscis by full-length cloning, which obtained the complete coding region of HarmOrco, OR24, and OR30. We then performed functional identification of HarmOR24 and OR30 by co-expressing them respectively with HarmOrco in Xenopus oocytes eukaryotic expression system combined with two-electrode voltage-clamp physiology. By testing the response of HarmOR24/OR30-expressing oocytes against eighty structural-divergent compounds, respectively, HarmOR30 was characterized to narrowly tune to indole and showed a specific tuning spectrum compared to its ortholog in Spodoptera littoralis. As indole is a distinctive herbivore-induced plant volatile and floral scent component, HarmOR30 might play roles in foraging and mediating the interactions between H. armigera with its surrounding environment.
Collapse
Affiliation(s)
- Mengbo Guo
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China;
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (X.R.); (Y.L.)
| | - Xueting Ren
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (X.R.); (Y.L.)
| | - Yang Liu
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (X.R.); (Y.L.)
| | - Guirong Wang
- Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen 518120, China;
- State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; (X.R.); (Y.L.)
- Correspondence: ; Tel.: +86-010-628-16947
| |
Collapse
|
13
|
Kerbs A, Burgardt A, Veldmann KH, Schäffer T, Lee JH, Wendisch VF. Fermentative production of halogenated tryptophan derivatives with Corynebacterium glutamicum overexpressing tryptophanase or decarboxylase genes. Chembiochem 2022; 23:e202200007. [PMID: 35224830 PMCID: PMC9315010 DOI: 10.1002/cbic.202200007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 02/25/2022] [Indexed: 11/24/2022]
Abstract
The aromatic amino acid l‐tryptophan serves as a precursor for many valuable compounds such as neuromodulators, indoleamines and indole alkaloids. In this work, tryptophan biosynthesis was extended by halogenation followed by decarboxylation to the respective tryptamines or cleavage to the respective indoles. Either the tryptophanase genes tnaAs from E. coli and Proteus vulgaris or the aromatic amino acid decarboxylase genes AADCs from Bacillus atrophaeus, Clostridium sporogenes, and Ruminococcus gnavus were expressed in Corynebacterium glutamicum strains producing (halogenated) tryptophan. Regarding indoles, final titers of 16 mg L−1 7‐Cl‐indole and 23 mg L−1 7‐Br‐indole were attained. Tryptamine production led to a much higher titer of 2.26 g L−1 upon expression of AADC from B. atrophaeus. AADC enzymes were shown to be active with halogenated tryptophan in vitro and in vivo and supported production of 0.36 g L−1 7‐Br‐tryptamine with a volumetric productivity of 8.3 mg L−1 h−1 in a fed‐batch fermentation.
Collapse
Affiliation(s)
- Anastasia Kerbs
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, GERMANY
| | - Arthur Burgardt
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, GERMANY
| | - Kareen H Veldmann
- Bielefeld University: Universitat Bielefeld, Genetisc of Prokaryotes, GERMANY
| | - Thomas Schäffer
- Bielefeld University: Universitat Bielefeld, Fermentation Technology, GERMANY
| | - Jin-Ho Lee
- Kyungsung University, Food Science and Biotechnology, KOREA, REPUBLIC OF
| | - Volker F Wendisch
- Bielefeld University: Universitat Bielefeld, Genetics of Prokaryotes, Universitätsstr. 25, 33615, Bielefeld, GERMANY
| |
Collapse
|
14
|
Zhou 周绍群 S, Jander G. Molecular ecology of plant volatiles in interactions with insect herbivores. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:449-462. [PMID: 34581787 DOI: 10.1093/jxb/erab413] [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: 07/07/2021] [Accepted: 09/08/2021] [Indexed: 06/13/2023]
Abstract
Plant-derived volatile organic compounds (VOCs) play pivotal roles in interactions with insect herbivores. Individual VOCs can be directly toxic or deterrent, serve as signal molecules to attract natural enemies, and/or be perceived by distal plant tissues as a priming signal to prepare for expected herbivory. Environmental conditions, as well as the specific plant-insect interaction being investigated, strongly influence the observed functions of VOC blends. The complexity of plant-insect chemical communication via VOCs is further enriched by the sophisticated molecular perception mechanisms of insects, which can respond to one or more VOCs and thereby influence insect behavior in a manner that has yet to be fully elucidated. Despite numerous gaps in the current understanding of VOC-mediated plant-insect interactions, successful pest management strategies such as push-pull systems, synthetic odorant traps, and crop cultivars with modified VOC profiles have been developed to supplement chemical pesticide applications and enable more sustainable agricultural practices. Future studies in this field would benefit from examining the responses of both plants and insects in the same experiment to gain a more complete view of these interactive systems. Furthermore, a molecular evolutionary study of key genetic elements of the ecological interaction phenotypes could provide new insights into VOC-mediated plant communication with insect herbivores.
Collapse
Affiliation(s)
- Shaoqun Zhou 周绍群
- Shenzhen Branch, Guangdong Laboratory of Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture and Rural Affairs, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, China
| | | |
Collapse
|
15
|
Hu L. Integration of multiple volatile cues into plant defense responses. THE NEW PHYTOLOGIST 2022; 233:618-623. [PMID: 34506634 DOI: 10.1111/nph.17724] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/26/2021] [Indexed: 06/13/2023]
Abstract
The ability to predict future risks is essential for many organisms, including plants. Plants can gather information about potential future herbivory by detecting volatiles that are emitted by herbivore-attacked neighbors. Several individual volatiles have been identified as active danger cues. Recent work has also shown that plants may integrate multiple volatiles into their defense responses. Here, I discuss how the integration of multiple volatiles can increase the capacity of plants to predict future herbivore attack. I propose that integration of multiple volatile cues does not occur at the perception stage, but may through downstream early defense signaling and then be further consolidated by hormonal crosstalk. Exploring plant volatile cue integration can facilitate our understanding and utilization of chemical information transfer.
Collapse
Affiliation(s)
- Lingfei Hu
- Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, 310058, China
- Institute of Plant Sciences, University of Bern, Bern, 3013, Switzerland
| |
Collapse
|
16
|
Kallure GS, Kumari A, Shinde BA, Giri AP. Characterized constituents of insect herbivore oral secretions and their influence on the regulation of plant defenses. PHYTOCHEMISTRY 2022; 193:113008. [PMID: 34768189 DOI: 10.1016/j.phytochem.2021.113008] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 10/09/2021] [Accepted: 11/04/2021] [Indexed: 06/13/2023]
Abstract
For more than 350 million years, there have been ongoing dynamic interactions between plants and insects. In several cases, insects cause-specific feeding damage with ensuing herbivore-associated molecular patterns that invoke characteristic defense responses. During feeding on plant tissue, insects release oral secretions (OSs) containing a repertoire of molecules affecting plant defense (effectors). Some of these OS components might elicit a defense response to combat insect attacks (elicitors), while some might curb the plant defenses (suppressors). Few reports suggest that the synthesis and function of OS components might depend on the host plant and associated microorganisms. We review these intricate plant-insect interactions, during which there is a continuous exchange of molecules between plants and feeding insects along with the associated microorganisms. We further provide a list of commonly identified inducible plant produced defensive molecules released upon insect attack as well as in response to OS treatments of the plants. Thus, we describe how plants specialized and defense-related metabolism is modulated at innumerable phases by OS during plant-insect interactions. A molecular understanding of these complex interactions will provide a means to design eco-friendly crop protection strategies.
Collapse
Affiliation(s)
- Gopal S Kallure
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune, 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, Uttar Pradesh, India
| | - Archana Kumari
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune, 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, Uttar Pradesh, India.
| | - Balkrishna A Shinde
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune, 411 008, Maharashtra, India; Department of Biotechnology, Shivaji University, Vidya Nagar, Kolhapur, 416004, Maharashtra, India
| | - Ashok P Giri
- Plant Molecular Biology Unit, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune, 411 008, Maharashtra, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, Uttar Pradesh, India.
| |
Collapse
|
17
|
Abramov A, Hoffmann T, Stark TD, Zheng L, Lenk S, Hammerl R, Lanzl T, Dawid C, Schön CC, Schwab W, Gierl A, Frey M. Engineering of benzoxazinoid biosynthesis in Arabidopsis thaliana: Metabolic and physiological challenges. PHYTOCHEMISTRY 2021; 192:112947. [PMID: 34534712 DOI: 10.1016/j.phytochem.2021.112947] [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: 06/22/2021] [Revised: 08/29/2021] [Accepted: 09/07/2021] [Indexed: 06/13/2023]
Abstract
Plant specialised metabolites constitute a layer of chemical defence. Classes of the defence compounds are often restricted to a certain taxon of plants, e.g. benzoxazinoids (BX) are characteristically detected in grasses. BXs confer wide-range defence by controlling herbivores and microbial pathogens and are allelopathic compounds. In the crops maize, wheat and rye high concentrations of BXs are synthesised at an early developmental stage. By transfer of six Bx-genes (Bx1 to Bx5 and Bx8) it was possible to establish the biosynthesis of 2,4-dihydroxy-1,4-benzoxazin-3-one glucoside (GDIBOA) in a concentration of up to 143 nmol/g dry weight in Arabidopsis thaliana. Our results indicate that inefficient channeling of substrates along the pathway and metabolisation of intermediates in host plants might be a general drawback for transgenic establishment of specialised metabolite biosynthesis pathways. As a consequence, BX levels required for defence are not obtained in Arabidopsis. We could show that indolin-2-one (ION), the first specific intermediate, is phytotoxic and is metabolised by hydroxylation and glycosylation by a wide spectrum of plants. In Arabidopsis, metabolic stress due to the enrichment of ION leads to elevated levels of salicylic acid (SA) and in addition to its intrinsic phytotoxicity, ION affects plant morphology indirectly via SA. We could show that Bx3 has a crucial role in the evolution of the pathway, first based on its impact on flux into the pathway and, second by C3-hydroxylation of the phytotoxic ION. Thereby BX3 interferes with a supposedly generic detoxification system towards the non-specific intermediate.
Collapse
Affiliation(s)
- Aleksej Abramov
- Chair of Plant Breeding, Technical University of Munich, Liesel-Beckman Str. 2, 85354, Freising, Germany
| | - Thomas Hoffmann
- Associate Professorship of Biotechnology of Natural Products, Technical University of Munich, Liesel-Beckmann Str. 1, 85354, Freising, Germany
| | - Timo D Stark
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner Str. 34, 85354, Freising, Germany
| | - Linlin Zheng
- Chair of Genetics, Technical University of Munich, Emil-Ramann Str. 8, 85354, Freising, Germany
| | - Stefan Lenk
- Chair of Genetics, Technical University of Munich, Emil-Ramann Str. 8, 85354, Freising, Germany
| | - Richard Hammerl
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner Str. 34, 85354, Freising, Germany
| | - Tobias Lanzl
- Chair of Plant Breeding, Technical University of Munich, Liesel-Beckman Str. 2, 85354, Freising, Germany
| | - Corinna Dawid
- Chair of Food Chemistry and Molecular Sensory Science, Technical University of Munich, Lise-Meitner Str. 34, 85354, Freising, Germany
| | - Chris-Carolin Schön
- Chair of Plant Breeding, Technical University of Munich, Liesel-Beckman Str. 2, 85354, Freising, Germany
| | - Wilfried Schwab
- Associate Professorship of Biotechnology of Natural Products, Technical University of Munich, Liesel-Beckmann Str. 1, 85354, Freising, Germany
| | - Alfons Gierl
- Chair of Genetics, Technical University of Munich, Emil-Ramann Str. 8, 85354, Freising, Germany
| | - Monika Frey
- Chair of Plant Breeding, Technical University of Munich, Liesel-Beckman Str. 2, 85354, Freising, Germany.
| |
Collapse
|
18
|
Development of Portable E-Nose System for Fast Diagnosis of Whitefly Infestation in Tomato Plant in Greenhouse. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9110297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
An electronic nose (E-nose) system equipped with a gas sensor array and real-time control panel was developed for a fast diagnosis of whitefly infestation in tomato plants. Profile changes of volatile organic compounds (VOCs) released from tomato plants under different treatments (i.e., whitefly infestation, mechanical damage, and no treatment) were successfully determined by the developed E-nose system. A rapid sensor response with high sensitivity towards whitefly-infested tomato plants was observed in the E-nose system. Results of principal component analysis (PCA) and hierarchical clustering analysis (HCA) indicated that the E-nose system was able to provide accurate distinguishment between whitefly-infested plants and healthy plants, with the first three principal components (PCs) accounting for 87.4% of the classification. To reveal the mechanism of whitefly infestation in tomato plants, VOC profiles of whitefly-infested plants and mechanically damaged plants were investigated by using the E-nose system and GC-MS. VOCs of 2-nonanol, oxime-, methoxy-phenyl, and n-hexadecanoic acid were only detected in whitefly-infested plants, while compounds of dodecane and 4,6-dimethyl were only found in mechanically damaged plant samples. Those unique VOC profiles of different tomato plant groups could be considered as bio-markers for diagnosing different damages. Moreover, the E-nose system was demonstrated to have the capability to differentiate whitefly-infested plants and mechanically damaged plants. The relationship between sensor performance and VOC profiles confirmed that the developed E-nose system could be used as a fast and smart device to detect whitefly infestation in greenhouse cultivation.
Collapse
|
19
|
Neuronal odor coding in the larval sensory cone of Anopheles coluzzii: Complex responses from a simple system. Cell Rep 2021; 36:109555. [PMID: 34407405 PMCID: PMC8420959 DOI: 10.1016/j.celrep.2021.109555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 05/18/2021] [Accepted: 07/28/2021] [Indexed: 11/20/2022] Open
Abstract
Anopheles mosquitoes are the sole vectors of malaria. Although adult females are directly responsible for disease transmission and accordingly have been extensively studied, the survival of pre-adult larval stages is vital. Mosquito larvae utilize a spectrum of chemosensory and other cues to navigate their aquatic habitats to avoid predators and search for food. Here we examine larval olfactory responses, in which the peripheral components are associated with the antennal sensory cone. Larval behavior and sensory cone responses to volatile stimuli in Anopheles coluzzii demonstrate the sensory cone is particularly tuned to alcohols, thiazoles, and heterocyclics, and these responses can be assigned to discrete groups of sensory cone neurons with distinctive profiles. These studies reveal that the anopheline larvae actively sample volatile odors above their aquatic habitats via a highly sophisticated olfactory system that is sensitive to a broad range of compounds with significant behavioral relevance. Sun et al. investigate larval sensory cone and behavioral responses to volatile stimuli in Anopheles coluzzii. They find that malaria mosquito larvae actively sample volatile odors above their aquatic habitats via a highly sophisticated olfactory system that is sensitive to a broad range of compounds with significant behavioral relevance.
Collapse
|
20
|
van Doan C, Züst T, Maurer C, Zhang X, Machado RAR, Mateo P, Ye M, Schimmel BCJ, Glauser G, Robert CAM. Herbivore-induced plant volatiles mediate defense regulation in maize leaves but not in maize roots. PLANT, CELL & ENVIRONMENT 2021; 44:2672-2686. [PMID: 33748996 PMCID: PMC8360093 DOI: 10.1111/pce.14052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 02/15/2021] [Accepted: 02/17/2021] [Indexed: 05/26/2023]
Abstract
Plant leaves that are exposed to herbivore-induced plant volatiles (HIPVs) respond by increasing their defenses, a phenomenon referred to as priming. Whether this phenomenon also occurs in the roots is unknown. Using maize plants, Zea mays, whose leaves respond strongly to leaf HIPVs, we measured the impact of belowground HIPVs, emanating from roots infested by the banded cucumber beetle, Diabrotica balteata, on constitutive and herbivore-induced levels of defense-related gene expression, phytohormones, volatile and non-volatile primary and secondary metabolites, growth and herbivore resistance in roots of neighbouring plants. HIPV exposure did not increase constitutive or induced levels of any of the measured root traits. Furthermore, HIPV exposure did not reduce the performance or survival of D. balteata on maize or its ancestor teosinte. Cross-exposure experiments between HIPVs from roots and leaves revealed that maize roots, in contrast to maize leaves, neither emit nor respond strongly to defense-regulating HIPVs. Together, these results demonstrate that volatile-mediated defense regulation is restricted to the leaves of maize. This finding is in line with the lower diffusibility of volatiles in the soil and the availability of other, potentially more efficient, information conduits below ground.
Collapse
Affiliation(s)
- Cong van Doan
- Institute of Plant SciencesUniversity of BernBernSwitzerland
- Oeschger Centre for Climate Change Research (OCCR)University of BernBernSwitzerland
| | - Tobias Züst
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | - Corina Maurer
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | - Xi Zhang
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | | | - Pierre Mateo
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | - Meng Ye
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | | | - Gaétan Glauser
- Neuchâtel Platform of Analytical ChemistryUniversité de NeuchâtelNeuchâtelSwitzerland
| | - Christelle A. M. Robert
- Institute of Plant SciencesUniversity of BernBernSwitzerland
- Oeschger Centre for Climate Change Research (OCCR)University of BernBernSwitzerland
| |
Collapse
|
21
|
Cadot S, Guan H, Bigalke M, Walser JC, Jander G, Erb M, van der Heijden MGA, Schlaeppi K. Specific and conserved patterns of microbiota-structuring by maize benzoxazinoids in the field. MICROBIOME 2021; 9:103. [PMID: 33962687 DOI: 10.1101/2020.05.03.075135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/15/2021] [Indexed: 05/20/2023]
Abstract
BACKGROUND Plants influence their root and rhizosphere microbial communities through the secretion of root exudates. However, how specific classes of root exudate compounds impact the assembly of root-associated microbiotas is not well understood, especially not under realistic field conditions. Maize roots secrete benzoxazinoids (BXs), a class of indole-derived defense compounds, and thereby impact the assembly of their microbiota. Here, we investigated the broader impacts of BX exudation on root and rhizosphere microbiotas of adult maize plants grown under natural conditions at different field locations in Europe and the USA. We examined the microbiotas of BX-producing and multiple BX-defective lines in two genetic backgrounds across three soils with different properties. RESULTS Our analysis showed that BX secretion affected the community composition of the rhizosphere and root microbiota, with the most pronounced effects observed for root fungi. The impact of BX exudation was at least as strong as the genetic background, suggesting that BX exudation is a key trait by which maize structures its associated microbiota. BX-producing plants were not consistently enriching microbial lineages across the three field experiments. However, BX exudation consistently depleted Flavobacteriaceae and Comamonadaceae and enriched various potential plant pathogenic fungi in the roots across the different environments. CONCLUSIONS These findings reveal that BXs have a selective impact on root and rhizosphere microbiota composition across different conditions. Taken together, this study identifies the BX pathway as an interesting breeding target to manipulate plant-microbiome interactions. Video Abstract.
Collapse
Affiliation(s)
- Selma Cadot
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland
- Department of Environmental Sciences, University of Basel, Bernoullistrasse 32, 4056, Basel, Switzerland
- Institute of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
| | - Hang Guan
- Institute of Geography, University of Bern, Bern, Switzerland
| | - Moritz Bigalke
- Institute of Geography, University of Bern, Bern, Switzerland
| | | | | | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Marcel G A van der Heijden
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland
- Institute of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
- Institute of Environmental Biology, Utrecht University, Utrecht, The Netherlands
| | - Klaus Schlaeppi
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland.
- Department of Environmental Sciences, University of Basel, Bernoullistrasse 32, 4056, Basel, Switzerland.
- Institute of Plant Sciences, University of Bern, Bern, Switzerland.
| |
Collapse
|
22
|
Cadot S, Guan H, Bigalke M, Walser JC, Jander G, Erb M, van der Heijden MGA, Schlaeppi K. Specific and conserved patterns of microbiota-structuring by maize benzoxazinoids in the field. MICROBIOME 2021; 9:103. [PMID: 33962687 PMCID: PMC8106187 DOI: 10.1186/s40168-021-01049-2] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/15/2021] [Indexed: 05/06/2023]
Abstract
BACKGROUND Plants influence their root and rhizosphere microbial communities through the secretion of root exudates. However, how specific classes of root exudate compounds impact the assembly of root-associated microbiotas is not well understood, especially not under realistic field conditions. Maize roots secrete benzoxazinoids (BXs), a class of indole-derived defense compounds, and thereby impact the assembly of their microbiota. Here, we investigated the broader impacts of BX exudation on root and rhizosphere microbiotas of adult maize plants grown under natural conditions at different field locations in Europe and the USA. We examined the microbiotas of BX-producing and multiple BX-defective lines in two genetic backgrounds across three soils with different properties. RESULTS Our analysis showed that BX secretion affected the community composition of the rhizosphere and root microbiota, with the most pronounced effects observed for root fungi. The impact of BX exudation was at least as strong as the genetic background, suggesting that BX exudation is a key trait by which maize structures its associated microbiota. BX-producing plants were not consistently enriching microbial lineages across the three field experiments. However, BX exudation consistently depleted Flavobacteriaceae and Comamonadaceae and enriched various potential plant pathogenic fungi in the roots across the different environments. CONCLUSIONS These findings reveal that BXs have a selective impact on root and rhizosphere microbiota composition across different conditions. Taken together, this study identifies the BX pathway as an interesting breeding target to manipulate plant-microbiome interactions. Video Abstract.
Collapse
Affiliation(s)
- Selma Cadot
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland
- Department of Environmental Sciences, University of Basel, Bernoullistrasse 32, 4056, Basel, Switzerland
- Institute of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
| | - Hang Guan
- Institute of Geography, University of Bern, Bern, Switzerland
| | - Moritz Bigalke
- Institute of Geography, University of Bern, Bern, Switzerland
| | | | | | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Bern, Switzerland
| | - Marcel G A van der Heijden
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland
- Institute of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland
- Institute of Environmental Biology, Utrecht University, Utrecht, The Netherlands
| | - Klaus Schlaeppi
- Division of Agroecology and Environment, Agroscope, Zurich, Switzerland.
- Department of Environmental Sciences, University of Basel, Bernoullistrasse 32, 4056, Basel, Switzerland.
- Institute of Plant Sciences, University of Bern, Bern, Switzerland.
| |
Collapse
|
23
|
Housh AB, Powell G, Scott S, Anstaett A, Gerheart A, Benoit M, Waller S, Powell A, Guthrie JM, Higgins B, Wilder SL, Schueller MJ, Ferrieri RA. Functional mutants of Azospirillum brasilense elicit beneficial physiological and metabolic responses in Zea mays contributing to increased host iron assimilation. THE ISME JOURNAL 2021; 15:1505-1522. [PMID: 33408368 PMCID: PMC8115672 DOI: 10.1038/s41396-020-00866-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 10/28/2020] [Accepted: 12/03/2020] [Indexed: 01/29/2023]
Abstract
Iron (Fe), an essential element for plant growth, is abundant in soil but with low bioavailability. Thus, plants developed specialized mechanisms to sequester the element. Beneficial microbes have recently become a favored method to promote plant growth through increased uptake of essential micronutrients, like Fe, yet little is known of their mechanisms of action. Functional mutants of the epiphytic bacterium Azospirillum brasilense, a prolific grass-root colonizer, were used to examine mechanisms for promoting iron uptake in Zea mays. Mutants included HM053, FP10, and ipdC, which have varying capacities for biological nitrogen fixation and production of the plant hormone auxin. Using radioactive iron-59 tracing and inductively coupled plasma mass spectrometry, we documented significant differences in host uptake of Fe2+/3+ correlating with mutant biological function. Radioactive carbon-11, administered to plants as 11CO2, provided insights into shifts in host usage of 'new' carbon resources in the presence of these beneficial microbes. Of the mutants examined, HM053 exhibited the greatest influence on host Fe uptake with increased plant allocation of 11C-resources to roots where they were transformed and exuded as 11C-acidic substrates to aid in Fe-chelation, and increased C-11 partitioning into citric acid, nicotianamine and histidine to aid in the in situ translocation of Fe once assimilated.
Collapse
Affiliation(s)
- A B Housh
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO, 65211, USA
| | - G Powell
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Department of Biochemistry, University of Missouri, Columbia, MO, 65211, USA
| | - S Scott
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Department of Biochemistry, University of Missouri, Columbia, MO, 65211, USA
| | - A Anstaett
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Department of Chemical Engineering, University of Missouri, Columbia, MO, 65211, USA
- Burns & McDonnell, Inc. 425 S, Woods Mill Rd., Chesterfield, MO, USA, 63017
| | - A Gerheart
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO, 65211, USA
- Idaho State Police 5255 S. 5th Ave, Pocatello, ID, 83204, USA
| | - M Benoit
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA
| | - S Waller
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- School of Natural Resources, University of Missouri, Columbia, MO, 65211, USA
| | - A Powell
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- School of Natural Resources, University of Missouri, Columbia, MO, 65211, USA
| | - J M Guthrie
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
| | - B Higgins
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
| | - S L Wilder
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
| | - M J Schueller
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA
- Chemistry Department, University of Missouri, Columbia, MO, 65211, USA
| | - R A Ferrieri
- Missouri Research Reactor Center, University of Missouri, Columbia, MO, 65211, USA.
- Chemistry Department, University of Missouri, Columbia, MO, 65211, USA.
- Division of Plant Sciences, University of Missouri, Columbia, MO, 65211, USA.
- Interdisciplinary Plant Group, University of Missouri, Columbia, MO, 65211, USA.
| |
Collapse
|
24
|
The Roots of Rye ( Secale cereale L.) Are Capable of Synthesizing Benzoxazinoids. Int J Mol Sci 2021; 22:ijms22094656. [PMID: 33925031 PMCID: PMC8124178 DOI: 10.3390/ijms22094656] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/26/2021] [Accepted: 04/26/2021] [Indexed: 11/17/2022] Open
Abstract
According to current opinion, the first step of benzoxazinoids (BXs) synthesis, that is, the conversion of indole-3-glycerol phosphate to indole, occurs exclusively in the photosynthesising parts of plants. However, the results of our previous work and some other studies suggest that this process may also occur in the roots. In this study, we provide evidence that the first step of BXs synthesis does indeed occur in the roots of rye seedlings. We detected ScBx1 transcripts, BX1 enzyme, and six BXs (2-hydroxy-1,4-benzoxazin-3-one, 2,4-dihydroxy-1,4-benzoxazin-3-one, (2R)-2-O-β-d-glucopyranosyl-4-hydroxy-(2H)-1,4-benzoxazin-3(4H)-one glucoside, 2,4-dihydroxy- 7-methoxy-1,4-benzoxazin-3-one, 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one glucoside, and 6-methoxy-2-benzoxazolinone) in the roots developed from seeds deprived of the coleoptile at 2 days after sowing (i.e., roots without contact with aerial parts). In roots regenerated in vitro, both ScBx1 transcripts and BX1 enzyme were detected at a low but still measurable levels. Thus, BXs are able to be synthesised in both the roots and above-ground parts of rye plants.
Collapse
|
25
|
Dudek B, Warskulat AC, Vogel H, Wielsch N, Menezes RC, Hupfer Y, Paetz C, Gebauer-Jung S, Svatoš A, Schneider B. An Integrated-Omics/Chemistry Approach Unravels Enzymatic and Spontaneous Steps to Form Flavoalkaloidal Nudicaulin Pigments in Flowers of Papaver nudicaule L. Int J Mol Sci 2021; 22:ijms22084129. [PMID: 33923591 PMCID: PMC8073789 DOI: 10.3390/ijms22084129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 03/26/2021] [Accepted: 04/13/2021] [Indexed: 11/16/2022] Open
Abstract
Flower colour is an important trait for plants to attract pollinators and ensure their reproductive success. Among yellow flower pigments, the nudicaulins in Papaver nudicaule L. (Iceland poppy) are unique due to their rarity and unparalleled flavoalkaloid structure. Nudicaulins are derived from pelargonidin glycoside and indole, products of the flavonoid and indole/tryptophan biosynthetic pathway, respectively. To gain insight into the molecular and chemical basis of nudicaulin biosynthesis, we combined transcriptome, differential gel electrophoresis (DIGE)-based proteome, and ultra-performance liquid chromatography-high resolution mass spectrometry (UPLC-HRMS)-based metabolome data of P. nudicaule petals with chemical investigations. We identified candidate genes and proteins for all biosynthetic steps as well as some key metabolites across five stages of petal development. Candidate genes of amino acid biosynthesis showed a relatively stable expression throughout petal development, whereas most candidate genes of flavonoid biosynthesis showed increasing expression during development followed by downregulation in the final stage. Notably, gene candidates of indole-3-glycerol-phosphate lyase (IGL), sharing characteristic sequence motifs with known plant IGL genes, were co-expressed with flavonoid biosynthesis genes, and are probably providing free indole. The fusion of indole with pelargonidin glycosides was retraced synthetically and promoted by high precursor concentrations, an excess of indole, and a specific glycosylation pattern of pelargonidin. Thus, nudicaulin biosynthesis combines the enzymatic steps of two different pathways with a spontaneous fusion of indole and pelargonidin glycoside under precisely tuned reaction conditions.
Collapse
|
26
|
Richter A, Powell AF, Mirzaei M, Wang LJ, Movahed N, Miller JK, Piñeros MA, Jander G. Indole-3-glycerolphosphate synthase, a branchpoint for the biosynthesis of tryptophan, indole, and benzoxazinoids in maize. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2021; 106:245-257. [PMID: 33458870 DOI: 10.1111/tpj.15163] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 12/22/2020] [Accepted: 01/07/2021] [Indexed: 06/12/2023]
Abstract
The maize (Zea mays) genome encodes three indole-3-glycerolphosphate synthase enzymes (IGPS1, 2, and 3) catalyzing the conversion of 1-(2-carboxyphenylamino)-l-deoxyribulose-5-phosphate to indole-3-glycerolphosphate. Three further maize enzymes (BX1, benzoxazinoneless 1; TSA, tryptophan synthase alpha subunit; and IGL, indole glycerolphosphate lyase) convert indole-3-glycerolphosphate to indole, which is released as a volatile defense signaling compound and also serves as a precursor for the biosynthesis of tryptophan and defense-related benzoxazinoids. Phylogenetic analyses showed that IGPS2 is similar to enzymes found in both monocots and dicots, whereas maize IGPS1 and IGPS3 are in monocot-specific clades. Fusions of yellow fluorescent protein with maize IGPS enzymes and indole-3-glycerolphosphate lyases were all localized in chloroplasts. In bimolecular fluorescence complementation assays, IGPS1 interacted strongly with BX1 and IGL, IGPS2 interacted primarily with TSA, and IGPS3 interacted equally with all three indole-3-glycerolphosphate lyases. Whereas IGPS1 and IGPS3 expression was induced by insect feeding, IGPS2 expression was not. Transposon insertions in IGPS1 and IGPS3 reduced the abundance of both benzoxazinoids and free indole. Spodoptera exigua (beet armyworm) larvae show improved growth on igps1 mutant maize plants. Together, these results suggest that IGPS1 and IGPS3 function mainly in the biosynthesis of defensive metabolites, whereas IGPS2 may be involved in the biosynthesis of tryptophan. This metabolic channeling is similar to, though less exclusive than, that proposed for the three maize indole-3-glycerolphosphate lyases.
Collapse
Affiliation(s)
| | | | | | | | | | - Julia K Miller
- Plant Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA
| | - Miguel A Piñeros
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Ithaca, NY, USA
| | | |
Collapse
|
27
|
Perez-Sanz F, Ruiz-Hernández V, Terry MI, Arce-Gallego S, Weiss J, Navarro PJ, Egea-Cortines M. gcProfileMakeR: An R Package for Automatic Classification of Constitutive and Non-Constitutive Metabolites. Metabolites 2021; 11:metabo11040211. [PMID: 33807334 PMCID: PMC8065537 DOI: 10.3390/metabo11040211] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 03/29/2021] [Accepted: 03/29/2021] [Indexed: 11/16/2022] Open
Abstract
Metabolomes comprise constitutive and non-constitutive metabolites produced due to physiological, genetic or environmental effects. However, finding constitutive metabolites and non-constitutive metabolites in large datasets is technically challenging. We developed gcProfileMakeR, an R package using standard Excel output files from an Agilent Chemstation GC-MS for automatic data analysis using CAS numbers. gcProfileMakeR has two filters for data preprocessing removing contaminants and low-quality peaks. The first function NormalizeWithinFiles, samples assigning retention times to CAS. The second function NormalizeBetweenFiles, reaches a consensus between files where compounds in close retention times are grouped together. The third function getGroups, establishes what is considered as Constitutive Profile, Non-constitutive by Frequency i.e., not present in all samples and Non-constitutive by Quality. Results can be plotted with the plotGroup function. We used it to analyse floral scent emissions in four snapdragon genotypes. These included a wild type, Deficiens nicotianoides and compacta affecting floral identity and RNAi:AmLHY targeting a circadian clock gene. We identified differences in scent constitutive and non-constitutive profiles as well as in timing of emission. gcProfileMakeR is a very useful tool to define constitutive and non-constitutive scent profiles. It also allows to analyse genotypes and circadian datasets to identify differing metabolites.
Collapse
Affiliation(s)
- Fernando Perez-Sanz
- Instituto Murciano de Investigaciones Biomédicas El Palmar, 30120 Murcia, Spain;
| | | | - Marta I. Terry
- Genética Molecular, Instituto de Biotecnología Vegetal, Edificio I+D+I, Plaza del Hospital s/n, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain; (M.I.T.); (J.W.)
| | | | - Julia Weiss
- Genética Molecular, Instituto de Biotecnología Vegetal, Edificio I+D+I, Plaza del Hospital s/n, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain; (M.I.T.); (J.W.)
| | - Pedro J. Navarro
- DSIE Cuartel de Antiguones, Plaza del Hospital s/n, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain;
| | - Marcos Egea-Cortines
- Genética Molecular, Instituto de Biotecnología Vegetal, Edificio I+D+I, Plaza del Hospital s/n, Universidad Politécnica de Cartagena, 30202 Cartagena, Spain; (M.I.T.); (J.W.)
- Correspondence: ; Tel.: +34-868071078
| |
Collapse
|
28
|
Johnson SD, Sivechurran J, Doarsamy S, Shuttleworth A. Dung mimicry: the function of volatile emissions and corolla patterning in fly-pollinated Wurmbea flowers. THE NEW PHYTOLOGIST 2020; 228:1662-1673. [PMID: 33460187 DOI: 10.1111/nph.16791] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/26/2020] [Indexed: 06/12/2023]
Abstract
It has been suggested that flowers of some angiosperms mimic vertebrate faeces (dung) in order to exploit insect pollinators that utilize faeces as a source of food and/or oviposition sites. We investigated a potential case of mimicry in Wurmbea elatior (Colchicaceae), a lily that exhibits a faecal odour and pattern of dark spots on the corolla. We found that W. elatior is pollinated by a broad assemblage of coprophagous flies and is dependent on pollinator visits for seed production. The flowers emit volatiles that are characteristic of vertebrate faeces, and three of these compounds - skatole, indole, and an unidentified compound - elicited electrophysiological antennal responses from flies. Artificial flowers laced with indole and skatole or skatole alone attracted the same assemblage of flies as was recorded on flowers of W. elatior. Spotted artificial flowers attracted twice as many flies as did those lacking spots. Experimental addition of indole and skatole to flowers of Wurmbea kraussii, a congener with unscented flowers pollinated by hoverflies, induced a shift to an insect visitor assemblage dominated by coprophagous flies. This study clarifies the roles of volatile emissions (particularly skatole) and visual signals in floral dung mimicry.
Collapse
Affiliation(s)
- Steven D Johnson
- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Post Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Jadine Sivechurran
- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Post Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Sachin Doarsamy
- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Post Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| | - Adam Shuttleworth
- Centre for Functional Biodiversity, School of Life Sciences, University of KwaZulu-Natal, Post Bag X01, Scottsville, Pietermaritzburg, 3209, South Africa
| |
Collapse
|
29
|
van Doan C, Züst T, Maurer C, Zhang X, Machado RAR, Mateo P, Ye M, Schimmel BCJ, Glauser G, Robert CAM. Volatile-mediated defence regulation occurs in maize leaves but not in maize root. PLANT, CELL & ENVIRONMENT 2020:pce.13919. [PMID: 33073385 DOI: 10.1111/pce.13919] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The above article was published in error by the publisher before a final editorial decision had been reached. It has therefore been removed temporarily while the editorial process concludes. The publisher apologizes for the inconvenience.
Collapse
|
30
|
Song S, Wood TK. Combatting Persister Cells With Substituted Indoles. Front Microbiol 2020; 11:1565. [PMID: 32733426 PMCID: PMC7358577 DOI: 10.3389/fmicb.2020.01565] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/16/2020] [Indexed: 12/14/2022] Open
Abstract
Given that a subpopulation of most bacterial cells becomes dormant due to stress, and that the resting cells of pathogens can revive and reconstitute infections, it is imperative to find methods to treat dormant cells to eradicate infections. The dormant bacteria that are not spores or cysts are known as persister cells. Remarkably, in contrast to the original report that incorrectly indicated indole increases persistence, a large number of indole-related compounds have been found in the last few years that kill persister cells. Hence, in this review, along with a summary of recent results related to persister cell formation and resuscitation, we focus on the ability of indole and substituted indoles to combat the persister cells of both pathogens and non-pathogens.
Collapse
Affiliation(s)
- Sooyeon Song
- Department of Animal Science, Jeonbuk National University, Jeonju, South Korea
| | - Thomas K. Wood
- Department of Chemical Engineering, Pennsylvania State University, University Park, PA, United States
| |
Collapse
|
31
|
Zhou Y, Zeng L, Hou X, Liao Y, Yang Z. Low temperature synergistically promotes wounding-induced indole accumulation by INDUCER OF CBF EXPRESSION-mediated alterations of jasmonic acid signaling in Camellia sinensis. JOURNAL OF EXPERIMENTAL BOTANY 2020; 71:2172-2185. [PMID: 31900491 PMCID: PMC7242085 DOI: 10.1093/jxb/erz570] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 12/31/2019] [Indexed: 05/02/2023]
Abstract
Plants have to cope with various environmental stress factors which significantly impact plant physiology and secondary metabolism. Individual stresses, such as low temperature, are known to activate plant volatile compounds as a defense. However, less is known about the effect of multiple stresses on plant volatile formation. Here, the effect of dual stresses (wounding and low temperature) on volatile compounds in tea (Camellia sinensis) plants and the underlying signalling mechanisms were investigated. Indole, an insect resistance volatile, was maintained at a higher content and for a longer time under dual stresses compared with wounding alone. CsMYC2a, a jasmonate (JA)-responsive transcription factor, was the major regulator of CsTSB2, a gene encoding a tryptophan synthase β-subunit essential for indole synthesis. During the recovery phase after tea wounding, low temperature helped to maintain a higher JA level. Further study showed that CsICE2 interacted directly with CsJAZ2 to relieve inhibition of CsMYC2a, thereby promoting JA biosynthesis and downstream expression of the responsive gene CsTSB2 ultimately enhancing indole biosynthesis. These findings shed light on the role of low temperature in promoting plant damage responses and advance knowledge of the molecular mechanisms by which multiple stresses coordinately regulate plant responses to the biotic and abiotic environment.
Collapse
Affiliation(s)
- Ying Zhou
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
| | - Lanting Zeng
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
| | - Xingliang Hou
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
| | - Yinyin Liao
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
| | - Ziyin Yang
- Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
- Center of Economic Botany, Core Botanical Gardens, Chinese Academy of Sciences, Tianhe District, Guangzhou, China
- Correspondence:
| |
Collapse
|
32
|
Wlazło A, Święcicka M, Koter MD, Krępski T, Bolibok L, Stochmal A, Kowalczyk M, Rakoczy-Trojanowska M. Genes ScBx1 and ScIgl-Competitors or Cooperators? Genes (Basel) 2020; 11:genes11020223. [PMID: 32093268 PMCID: PMC7074272 DOI: 10.3390/genes11020223] [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: 12/30/2019] [Revised: 02/03/2020] [Accepted: 02/05/2020] [Indexed: 12/16/2022] Open
Abstract
Two genes, Bx1 and Igl, both encoding indole-3-glycerol phosphate lyase (IGL), are believed to control the conversion of indole-3-glycerol phosphate (IGP) to indole. The first of these has generally been supposed to be regulated developmentally, being expressed at early stages of plant development with the indole being used in the benzoxazinoid (BX) biosynthesis pathway. In contrast, it has been proposed that the second one is regulated by stresses and that the associated free indole is secreted as a volatile. However, our previous results contradicted this. In the present study, we show that the ScIgl gene takes over the role of ScBx1 at later developmental stages, between the 42nd and 70th days after germination. In the majority of plants with silenced ScBx1 expression, ScIgl was either expressed at a significantly higher level than ScBx1 or it was the only gene with detectable expression. Therefore, we postulate that the synthesis of indole used in BX biosynthesis in rye is controlled by both ScBx1 and ScIgl, which are both regulated developmentally and by stresses. In silico and in vivo analyses of the promoter sequences further confirmed our hypothesis that the roles and modes of regulation of the ScBx1 and ScIgl genes are similar.
Collapse
Affiliation(s)
- Anna Wlazło
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, 02-787 Warsaw, Poland; (A.W.); (M.Ś.); (M.D.K.); (T.K.)
| | - Magdalena Święcicka
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, 02-787 Warsaw, Poland; (A.W.); (M.Ś.); (M.D.K.); (T.K.)
| | - Marek D. Koter
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, 02-787 Warsaw, Poland; (A.W.); (M.Ś.); (M.D.K.); (T.K.)
| | - Tomasz Krępski
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, 02-787 Warsaw, Poland; (A.W.); (M.Ś.); (M.D.K.); (T.K.)
| | - Leszek Bolibok
- Department of Silviculture, Institute of Forest Sciences, Warsaw University of Life Sciences, 02-787 Warsaw, Poland;
| | - Anna Stochmal
- Department of Biochemistry and Crop Quality, Institute of Soil Science and Plant Cultivation, State Research Institute, 24-100 Puławy, Poland; (A.S.); (M.K.)
| | - Mariusz Kowalczyk
- Department of Biochemistry and Crop Quality, Institute of Soil Science and Plant Cultivation, State Research Institute, 24-100 Puławy, Poland; (A.S.); (M.K.)
| | - Monika Rakoczy-Trojanowska
- Department of Plant Genetics, Breeding and Biotechnology, Institute of Biology, Warsaw University of Life Sciences, 02-787 Warsaw, Poland; (A.W.); (M.Ś.); (M.D.K.); (T.K.)
- Correspondence: ; Tel.: +48-225932150
| |
Collapse
|
33
|
Hunter CT, Block AK, Christensen SA, Li QB, Rering C, Alborn HT. Setaria viridis as a model for translational genetic studies of jasmonic acid-related insect defenses in Zea mays. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2020; 291:110329. [PMID: 31928686 DOI: 10.1016/j.plantsci.2019.110329] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 10/24/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
Little is known regarding insect defense pathways in Setaria viridis (setaria), a model system for panicoid grasses, including Zea mays (maize). It is thus of interest to compare insect herbivory responses of setaria and maize. Here we use metabolic, phylogenetic, and gene expression analyses to measure a subset of jasmonic acid (JA)-related defense responses to leaf-chewing caterpillars. Phylogenetic comparisons of known defense-related maize genes were used to identify putative orthologs in setaria, and candidates were tested by quantitative PCR to determine transcriptional responses to insect challenge. Our findings show that while much of the core JA-related metabolic and genetic responses appear conserved between setaria and maize, production of downstream secondary metabolites such as benzoxazinoids and herbivore-induced plant volatiles are dissimilar. This diversity of chemical defenses and gene families involved in secondary metabolism among grasses presents new opportunities for cross species engineering. The high degree of genetic similarity and ease of orthologous gene identification between setaria and maize make setaria an excellent species for translational genetic studies, but the species specificity of downstream insect defense chemistry makes some pathways unamenable to cross-species comparisons.
Collapse
Affiliation(s)
- Charles T Hunter
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA.
| | - Anna K Block
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA
| | - Shawn A Christensen
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA
| | - Qin-Bao Li
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA
| | - Caitlin Rering
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA
| | - Hans T Alborn
- Chemistry Research Unit, USDA Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, Gainesville, FL, 32608, USA
| |
Collapse
|
34
|
Meents AK, Mithöfer A. Plant-Plant Communication: Is There a Role for Volatile Damage-Associated Molecular Patterns? FRONTIERS IN PLANT SCIENCE 2020; 11:583275. [PMID: 33178248 PMCID: PMC7593327 DOI: 10.3389/fpls.2020.583275] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 09/17/2020] [Indexed: 05/16/2023]
Abstract
Damage-associated molecular patterns (DAMPs) are an ancient form of tissue-derived danger or alarm signals that initiate cellular signaling cascades, which often initiate defined defense responses. A DAMP can be any molecule that is usually not exposed to cells such as cell wall components, peptides, nucleic acid fragments, eATP and other compounds. DAMPs might be revealed upon tissue damage or during attack. Typically, DAMPs are derived from the injured organism. Almost all eukaryotes can generate and respond to DAMPs, including plants. Besides the molecules mentioned, certain volatile organic compounds (VOCs) can be considered as DAMPs. Due to their chemical nature, VOCs are supposed to act not only locally and systemically in the same plant but also between plants. Here, we focus on damage-induced volatiles (DIVs) that might be regarded as DAMPs; we will review their origin, chemical nature, physiochemical properties, biological relevance and putative function in plant-plant communications. Moreover, we discuss the possibility to use such airborne DAMPs as eco-friendly compounds to stimulate natural defenses in agriculture in order to avoid pesticides.
Collapse
|
35
|
Schupfner M, Busch F, Wysocki VH, Sterner R. Generation of a Stand-Alone Tryptophan Synthase α-Subunit by Mimicking an Evolutionary Blueprint. Chembiochem 2019; 20:2747-2751. [PMID: 31090986 DOI: 10.1002/cbic.201900323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Indexed: 11/05/2022]
Abstract
The αββα tryptophan synthase (TS), which is part of primary metabolism, is a paradigm for allosteric communication in multienzyme complexes. In particular, the intrinsically low catalytic activity of the α-subunit TrpA is stimulated several hundredfold through the interaction with the β-subunit TrpB1. The BX1 protein from Zea mays (zmBX1), which is part of secondary metabolism, catalyzes the same reaction as that of its homologue TrpA, but with high activity in the absence of an interaction partner. The intrinsic activity of TrpA can be significantly increased through the exchange of several active-site loop residues, which mimic the corresponding loop in zmBX1. The subsequent identification of activating amino acids in the generated "stand-alone" TrpA contributes to an understanding of allostery in TS. Moreover, findings suggest an evolutionary trajectory that describes the transition from a primary metabolic enzyme regulated by an interaction partner to a self-reliant, stand-alone, secondary metabolic enzyme.
Collapse
Affiliation(s)
- Michael Schupfner
- Institute of Biophysics and Physical Biochemistry, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Florian Busch
- Department of Chemistry and Biochemistry and, Resource for Native Mass Spectrometry Guided Structural Biology, The Ohio State University, 473 W 12th Ave, Columbus, OH, 43210, USA
| | - Vicki H Wysocki
- Department of Chemistry and Biochemistry and, Resource for Native Mass Spectrometry Guided Structural Biology, The Ohio State University, 473 W 12th Ave, Columbus, OH, 43210, USA
| | - Reinhard Sterner
- Institute of Biophysics and Physical Biochemistry, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| |
Collapse
|
36
|
Miao Y, Xu L, He X, Zhang L, Shaban M, Zhang X, Zhu L. Suppression of tryptophan synthase activates cotton immunity by triggering cell death via promoting SA synthesis. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 98:329-345. [PMID: 30604574 DOI: 10.1111/tpj.14222] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 02/11/2019] [Accepted: 12/17/2018] [Indexed: 05/14/2023]
Abstract
Primary metabolism plays an important role in plant growth and development, however the relationship between primary metabolism and the adaptive immune response is largely unknown. Here, we employed RNA interference (RNAi), virus-induced gene silencing (VIGS) technology, phytohormone profiling, genetic studies, and transcriptome and metabolome analysis to investigate the function of the tryptophan synthesis pathway in the resistance of cotton to V. dahliae. We found that knock-down of GbTSA1 (Tryptophan Synthase α) and GbTSB1 (tryptophan synthase β) induced a spontaneous cell death phenotype in a salicylic acid (SA)-dependent manner and enhanced resistance to V. dahliae in cotton plants. Metabolome analysis showed that indole and indolic metabolites were highly accumulated in GbTSA1- or GbTSB1-silenced plants. Transcriptomic analysis showed that exogenous indole promotes the expression levels of genes involved in SA synthesis and the defense response. Similarly, indole application strongly enhanced cotton resistance to V. dahliae. These results suggested that metabolic intermediates in the Trp synthesis pathway may be a signal to activate SA synthesis. These results also provided a strategy to elicit plant defense responses by the application of indole.
Collapse
Affiliation(s)
- Yuhuan Miao
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Lian Xu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Xin He
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Lin Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Muhammad Shaban
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Xianlong Zhang
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| | - Longfu Zhu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei, 430070, China
| |
Collapse
|
37
|
Hu L, Ye M, Erb M. Integration of two herbivore-induced plant volatiles results in synergistic effects on plant defence and resistance. PLANT, CELL & ENVIRONMENT 2019; 42:959-971. [PMID: 30195252 PMCID: PMC6392123 DOI: 10.1111/pce.13443] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 08/25/2018] [Accepted: 09/02/2018] [Indexed: 05/03/2023]
Abstract
Plants can use induced volatiles to detect herbivore- and pathogen-attacked neighbors and prime their defenses. Several individual volatile priming cues have been identified, but whether plants are able to integrate multiple cues from stress-related volatile blends remains poorly understood. Here, we investigated how maize plants respond to two herbivore-induced volatile priming cues with complementary information content, the green leaf volatile (Z)-3-hexenyl acetate (HAC) and the aromatic volatile indole. In the absence of herbivory, HAC directly induced defence gene expression, whereas indole had no effect. Upon induction by simulated herbivory, both volatiles increased jasmonate signalling, defence gene expression, and defensive secondary metabolite production and increased plant resistance. Plant resistance to caterpillars was more strongly induced in dual volatile-exposed plants than plants exposed to single volatiles.. Induced defence levels in dual volatile-exposed plants were significantly higher than predicted from the added effects of the individual volatiles, with the exception of induced plant volatile production, which showed no increase upon dual-exposure relative to single exposure. Thus, plants can integrate different volatile cues into strong and specific responses that promote herbivore defence induction and resistance. Integrating multiple volatiles may be beneficial, as volatile blends are more reliable indicators of future stress than single cues.
Collapse
Affiliation(s)
- Lingfei Hu
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | - Meng Ye
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| | - Matthias Erb
- Institute of Plant SciencesUniversity of BernBernSwitzerland
| |
Collapse
|
38
|
Ruel DM, Yakir E, Bohbot JD. Supersensitive Odorant Receptor Underscores Pleiotropic Roles of Indoles in Mosquito Ecology. Front Cell Neurosci 2019; 12:533. [PMID: 30733668 PMCID: PMC6353850 DOI: 10.3389/fncel.2018.00533] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 12/31/2018] [Indexed: 11/13/2022] Open
Abstract
Mosquitoes exhibit highly diverse and fast evolving odorant receptors (ORs). The indole-sensitive OR gene clade, comprised of Or2 and Or10 is a notable exception on account of its conservation in both mosquito subfamilies. This group of paralogous genes exhibits a complex developmental expression pattern in Aedes aegypti: AaegOr2 is expressed in both adults and larvae, AaegOr10 is adult-specific and a third member named AaegOr9 is larva-specific. OR2 and OR10 have been deorphanized and are selectively activated by indole and skatole, respectively. Using the two-electrode voltage clamp of Xenopus oocytes expressing Ae. aegypti ORs, we show that AaegOR9 is supersensitive and narrowly tuned to skatole. Our findings suggest that Ae. aegypti has evolved two distinct molecular strategies to detect skatole in aquatic and terrestrial environments, highlighting the central ecological roles of indolic compounds in the evolutionary and life histories of these insects.
Collapse
Affiliation(s)
| | | | - Jonathan D. Bohbot
- Department of Entomology, The Hebrew University of Jerusalem, Rehovot, Israel
| |
Collapse
|
39
|
Yang P, Praz C, Li B, Singla J, Robert CAM, Kessel B, Scheuermann D, Lüthi L, Ouzunova M, Erb M, Krattinger SG, Keller B. Fungal resistance mediated by maize wall-associated kinase ZmWAK-RLK1 correlates with reduced benzoxazinoid content. THE NEW PHYTOLOGIST 2019; 221:976-987. [PMID: 30178602 DOI: 10.1111/nph.15419] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 07/30/2018] [Indexed: 05/20/2023]
Abstract
Wall-associated kinases (WAKs) have recently been identified as major components of fungal and bacterial disease resistance in several cereal crop species. However, the molecular mechanisms of WAK-mediated resistance remain largely unknown. Here, we investigated the function of the maize gene ZmWAK-RLK1 (Htn1) that confers quantitative resistance to northern corn leaf blight (NCLB) caused by the hemibiotrophic fungal pathogen Exserohilum turcicum. ZmWAK-RLK1 was found to localize to the plasma membrane and its presence resulted in a modification of the infection process by reducing pathogen penetration into host tissues. A large-scale transcriptome analysis of near-isogenic lines (NILs) differing for ZmWAK-RLK1 revealed that several differentially expressed genes are involved in the biosynthesis of the secondary metabolites benzoxazinoids (BXs). The contents of several BXs including DIM2 BOA-Glc were significantly lower when ZmWAK-RLK1 is present. DIM2 BOA-Glc concentration was significantly elevated in ZmWAK-RLK1 mutants with compromised NCLB resistance. Maize mutants that were affected in overall BXs biosynthesis or content of DIM2 BOA-Glc showed increased NCLB resistance. We conclude that Htn1-mediated NCLB resistance is associated with a reduction of BX secondary metabolites. These findings suggest a link between WAK-mediated quantitative disease resistance and changes in biochemical fluxes starting with indole-3-glycerol phosphate.
Collapse
Affiliation(s)
- Ping Yang
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
- Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, 100081, Beijing, China
| | - Coraline Praz
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
| | - Beibei Li
- Institute of Plant Sciences, University of Bern, CH-3013, Bern, Switzerland
| | - Jyoti Singla
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
| | | | | | | | - Linda Lüthi
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
| | | | - Matthias Erb
- Institute of Plant Sciences, University of Bern, CH-3013, Bern, Switzerland
| | - Simon G Krattinger
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
- King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Beat Keller
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, CH-8008, Zurich, Switzerland
| |
Collapse
|
40
|
Gao L, Shen G, Zhang L, Qi J, Zhang C, Ma C, Li J, Wang L, Malook SU, Wu J. An efficient system composed of maize protoplast transfection and HPLC-MS for studying the biosynthesis and regulation of maize benzoxazinoids. PLANT METHODS 2019; 15:144. [PMID: 31798670 PMCID: PMC6882228 DOI: 10.1186/s13007-019-0529-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 11/18/2019] [Indexed: 05/05/2023]
Abstract
BACKGROUND Insect herbivory poses a major threat to maize. Benzoxazinoids are important anti-insect secondary metabolites in maize, whose biosynthetic pathway has been extensively studied. However, yet little is known about how benzoxazinoids are regulated in maize, partly due to lack of mutant resources and recalcitrance to genetic transformation. Transient systems based on mesophyll- or cultured cell-derived protoplasts have been exploited in several plant species and have become a powerful tool for rapid or high-throughput assays of gene functions. Nevertheless, these systems have not been exploited to study the regulation of secondary metabolites. RESULTS A protocol for isolation of protoplasts from etiolated maize seedlings and efficient transfection was optimized. Furthermore, a 10-min-run-time and highly sensitive HPLC-MS method was established to rapidly detect and quantify maize benzoxazinoids. Coupling maize protoplast transfection and HPLC-MS, we screened a few genes potentially regulating benzoxazinoid biosynthesis using overexpression or silencing by artificial microRNA technology. CONCLUSIONS Combining the power of maize protoplast transfection and HPLC-MS analysis, this method allows rapid screening for the regulatory and biosynthetic genes of maize benzoxazinoids in protoplasts, before the candidates are selected for in planta functional analyses. This method can also be applied to study the biosynthesis and regulation of other secondary metabolites in maize and secondary metabolites in other plant species, including those not amenable to transformation.
Collapse
Affiliation(s)
- Lei Gao
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
- School of Biological Science, Yunnan University, Kunming, 650091 China
| | - Guojing Shen
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Lingdan Zhang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Jinfeng Qi
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Cuiping Zhang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Canrong Ma
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Jing Li
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Lei Wang
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Saif Ul Malook
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| | - Jianqiang Wu
- Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201 China
| |
Collapse
|
41
|
Shen Q, Liu L, Wang L, Wang Q. Indole primes plant defense against necrotrophic fungal pathogen infection. PLoS One 2018; 13:e0207607. [PMID: 30444911 PMCID: PMC6239302 DOI: 10.1371/journal.pone.0207607] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 11/02/2018] [Indexed: 12/20/2022] Open
Abstract
Indole is a volatile compound and emitted from plants challenged by insect infestation or mechanic wounding. It has been shown to prime defense against herbivory. Here we identified that indole induced defense either directly or as a priming agent against necrotrophic pathogens Fusarium graminearum and F. moniliforme in maize and Magnaporthe oryzae in rice. With indole pretreatment, smaller lesions were developed in infected leaves, as well as less fungal growth. Indole induced H2O2 burst in the priming stage like other priming substances did. Such priming relied on mitogen-activated protein kinase (MAPK) cascade, which potentially activated downstream defense signaling. In addition, indole priming resulted in earlier and stronger defensive gene expression upon pathogen infection, including genes of jasmonate and phytoalexin biosynthesis, pathogenesis-related proteins (PRs) and anti-oxidant enzymes, which enhanced plant resistance. Meanwhile, H2O2 was also identified as the priming agent to induce plant defense. Taken together, indole exhibited priming function not only against herbivory but also necrotrophic pathogens. The common emission of indole in plants suggests that it plays important roles as the universal and endogenous priming substance in plant defense.
Collapse
Affiliation(s)
- Qinqin Shen
- Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu, China
| | - Lijun Liu
- Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu, China
| | - Liping Wang
- Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu, China
| | - Qiang Wang
- Institute of Ecological Agriculture, Sichuan Agricultural University, Chengdu, China
- * E-mail:
| |
Collapse
|
42
|
Ma Q, Zhang X, Qu Y. Biodegradation and Biotransformation of Indole: Advances and Perspectives. Front Microbiol 2018; 9:2625. [PMID: 30443243 PMCID: PMC6221969 DOI: 10.3389/fmicb.2018.02625] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 10/15/2018] [Indexed: 11/17/2022] Open
Abstract
Indole is long regarded as a typical N-heterocyclic aromatic pollutant in industrial and agricultural wastewater, and recently it has been identified as a versatile signaling molecule with wide environmental distributions. An exponentially growing number of researches have been reported on indole due to its significant roles in bacterial physiology, pathogenesis, animal behavior and human diseases. From the viewpoint of both environmental bioremediation and biological studies, the researches on metabolism and fates of indole are important to realize environmental treatment and illuminate its biological function. Indole can be produced from tryptophan by tryptophanase in many bacterial species. Meanwhile, various bacterial strains have obtained the ability to transform and degrade indole. The characteristics and pathways for indole degradation have been investigated for a century, and the functional genes for indole aerobic degradation have also been uncovered recently. Interestingly, many oxygenases have proven to be able to oxidize indole to indigo, and this historic and motivating case for biological applications has attracted intensive attention for decades. Herein, the bacteria, enzymes and pathways for indole production, biodegradation and biotransformation are systematically summarized, and the future researches on indole-microbe interactions are also prospected.
Collapse
Affiliation(s)
- Qiao Ma
- Institute of Environmental Systems Biology, College of Environmental Science and Engineering, Dalian Maritime University, Dalian, China
| | - Xuwang Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Food and Environment, Dalian University of Technology, Panjin, China
| | - Yuanyuan Qu
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian, China
| |
Collapse
|
43
|
Erb M. Volatiles as inducers and suppressors of plant defense and immunity-origins, specificity, perception and signaling. CURRENT OPINION IN PLANT BIOLOGY 2018; 44:117-121. [PMID: 29674130 DOI: 10.1016/j.pbi.2018.03.008] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Revised: 03/22/2018] [Accepted: 03/30/2018] [Indexed: 05/08/2023]
Abstract
Volatiles from attacked plants, microbes and herbivores can enhance plant defenses. However, the absence of volatiles rather than their presence has sometimes been associated with enhanced defense, suggesting that volatiles may also act as defense suppressors. Recent work provides a potential mechanistic explanation for these observations by showing that volatile cues can modulate different hormonal pathways, including jasmonate (JA), salicylic acid (SA) and auxin (IAA) signaling. Many of these pathways interact with each other through crosstalk. Thus, volatiles may suppress plant defenses through negative hormonal crosstalk. Hormonal crosstalk may also allow plants to integrate different volatile cues to respond specifically and appropriately to environmental change.
Collapse
Affiliation(s)
- Matthias Erb
- Institute of Plant Sciences, University of Bern, Switzerland.
| |
Collapse
|
44
|
Block AK, Hunter CT, Rering C, Christensen SA, Meagher RL. Contrasting insect attraction and herbivore-induced plant volatile production in maize. PLANTA 2018; 248:105-116. [PMID: 29616394 DOI: 10.1007/s00425-018-2886-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 03/29/2018] [Indexed: 06/08/2023]
Abstract
The maize inbred line W22 has lower herbivore-induced volatile production than B73 but both fall armyworm larvae and the wasps that parasitize them prefer W22 over B73. Maize inbred line W22 is an important resource for genetic studies due to the availability of the UniformMu mutant population and a complete genome sequence. In this study, we assessed the suitability of W22 as a model for tritrophic interactions between maize, Spodoptera frugiperda (fall armyworm) and the parasitoid wasp Cotesia marginiventris. W22 was found to be a good model for studying the interaction as S. frugiperda prefers W22 over B73 and a higher parasitism rate by C. marginiventris was observed on W22 compared to the inbred line B73. W22 also produced lower amounts of many herbivore-induced volatile terpenes and indole emission upon treatment with S. frugiperda oral secretions. We propose that some of the major herbivore-induced terpene volatiles are perhaps impeding S. frugiperda and C. marginiventris preference and that as yet unidentified compounds are produced at low abundance may be positively impacting these interactions.
Collapse
Affiliation(s)
- Anna K Block
- US Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA.
| | - Charles T Hunter
- US Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA
| | - Caitlin Rering
- US Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA
| | - Shawn A Christensen
- US Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA
| | - Robert L Meagher
- US Department of Agriculture-Agricultural Research Service, Center for Medical, Agricultural and Veterinary Entomology, 1700 SW 23rd Drive, Gainesville, FL, 32608, USA
| |
Collapse
|
45
|
Ye M, Veyrat N, Xu H, Hu L, Turlings TCJ, Erb M. An herbivore-induced plant volatile reduces parasitoid attraction by changing the smell of caterpillars. SCIENCE ADVANCES 2018; 4:eaar4767. [PMID: 29774237 PMCID: PMC5955622 DOI: 10.1126/sciadv.aar4767] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Accepted: 04/03/2018] [Indexed: 05/18/2023]
Abstract
Herbivore-induced plant volatiles (HIPVs) can mediate tritrophic interactions by attracting natural enemies of insect herbivores such as predators and parasitoids. Whether HIPVs can also mediate tritrophic interactions by influencing the attractiveness of the herbivores themselves remains unknown. We explored this question by studying the role of indole, a common HIPV in the plant kingdom. We found that herbivory-induced indole increases the recruitment of the solitary endoparasitoid Microplitis rufiventris to maize plants that are induced by Spodoptera littoralis caterpillars. Surprisingly, however, indole reduces parasitoid recruitment when the caterpillars themselves are present on the plants. Further experiments revealed that indole exposure renders S. littoralis caterpillars unattractive to M. rufiventris, leading to an overall reduction in attractiveness of plant-herbivore complexes. Furthermore, indole increases S. littoralis resistance and decreases M. rufiventris parasitization success. S. littoralis caterpillars are repelled by indole in the absence of M. rufiventris but specifically stop avoiding the volatile in the presence of the parasitoid. Our study shows how an HIPV can undermine tritrophic interactions by reducing the suitability and attractiveness of caterpillars to parasitoids.
Collapse
Affiliation(s)
- Meng Ye
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
| | - Nathalie Veyrat
- Laboratory for Fundamental and Advanced Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2009 Neuchâtel, Switzerland
| | - Hao Xu
- Laboratory for Fundamental and Advanced Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2009 Neuchâtel, Switzerland
| | - Lingfei Hu
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
| | - Ted C. J. Turlings
- Laboratory for Fundamental and Advanced Research in Chemical Ecology, University of Neuchâtel, Rue Emile-Argand 11, 2009 Neuchâtel, Switzerland
- Corresponding author. (M.E.); (T.C.J.T.)
| | - Matthias Erb
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland
- Corresponding author. (M.E.); (T.C.J.T.)
| |
Collapse
|
46
|
Patt JM, Robbins PS, Niedz R, McCollum G, Alessandro R. Exogenous application of the plant signalers methyl jasmonate and salicylic acid induces changes in volatile emissions from citrus foliage and influences the aggregation behavior of Asian citrus psyllid (Diaphorina citri), vector of Huanglongbing. PLoS One 2018; 13:e0193724. [PMID: 29596451 PMCID: PMC5875780 DOI: 10.1371/journal.pone.0193724] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 02/18/2018] [Indexed: 11/18/2022] Open
Abstract
Huanglongbing, also known as citrus greening, is a destructive disease that threatens citrus production worldwide. It is putatively caused by the phloem-limited bacterium Candidatus Liberibacter asiaticus (Las). Currently, the disease is untreatable and efforts focus on intensive insecticide use to control the vector, Asian citrus psyllid (Diaphorina citri). Emerging psyllid resistance to multiple insecticides has generated investigations into the use of exogenously applied signaling compounds to enhance citrus resistance to D. citri and Las. In the present study, we examined whether foliar applications of methyl jasmonate (MJ), a volatile signaling compound associated with the induced systemic resistance pathway, and salicylic acid, a constituent of the systemic acquired resistance pathway, would elicit the emission of defense-related volatiles in citrus foliage, and what effect this might have on the host-plant searching behavior of D. citri. Comparisons were made of volatiles emitted from growing shoots of uninfected and Las-infected 'Valencia' sweet orange (Citrus sinensis) trees over two consecutive sampling days. A settling behavioral assay was used to compare psyllid attraction to MJ-treated vs. Tween-treated citrus sprigs. All three main effects, Las infection status, plant signaler application, and sampling day, influenced the proportions of individual volatile compounds emitted in different treatment groups. MJ- and SA-treated trees had higher emission rates than Tween-treated trees. Methyl salicylate (MeSA) and β-caryophyllene were present in higher proportions in the volatiles collected from Las-infected + trees. On the other hand, Las-infected + MJ-treated trees emitted lower proportions of MeSA than did Las-infected + Tween-treated trees. Because MeSA is a key D. citri attractant, this result suggests that MJ application could suppress MeSA emission from Las-infected trees, an approach that could be used to discourage psyllid colonization during shoot growth. MJ application enhanced emission of E-β-ocimene, indole, volatiles attractive to many of the psyllid's natural enemies, indicating that MJ application could be used in an 'attract and reward' conservation biological control strategy. Volatile emissions in SA-treated trees were dominated by MeSA. MJ application elicited aggregation behavior in D. citri. Similar numbers of psyllids settled on MJ-treated versus Tween-treated sprigs, but a significantly greater percentage of the MJ-treated sprigs had aggregations of nine or more psyllids on them. Taken together, the results of this study indicate that exogenous applications of MJ or SA could be used to influence Asian citrus psyllid settling behavior and attract its natural enemies.
Collapse
Affiliation(s)
- Joseph M. Patt
- United States Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America
- * E-mail:
| | - Paul S. Robbins
- United States Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America
| | - Randy Niedz
- United States Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America
| | - Greg McCollum
- United States Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America
| | - Rocco Alessandro
- United States Department of Agriculture, Agricultural Research Service, U.S. Horticultural Research Laboratory, Fort Pierce, Florida, United States of America
| |
Collapse
|
47
|
Wang X, Chen Q, Wu Y, Lemmon ZH, Xu G, Huang C, Liang Y, Xu D, Li D, Doebley JF, Tian F. Genome-wide Analysis of Transcriptional Variability in a Large Maize-Teosinte Population. MOLECULAR PLANT 2018; 11:443-459. [PMID: 29275164 DOI: 10.1016/j.molp.2017.12.011] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 10/21/2017] [Accepted: 12/11/2017] [Indexed: 05/18/2023]
Abstract
Gene expression regulation plays an important role in controlling plant phenotypes and adaptation. Here, we report a comprehensive assessment of gene expression variation through the transcriptome analyses of a large maize-teosinte experimental population. Genome-wide mapping identified 25 660 expression quantitative trait loci (eQTL) for 17 311 genes, capturing an unprecedented range of expression variation. We found that local eQTL were more frequently mapped to adjacent genes, displaying a mode of expression piggybacking, which consequently created co-regulated gene clusters. Genes within the co-regulated gene clusters tend to have relevant functions and shared chromatin modifications. Distant eQTL formed 125 significant distant eQTL hotspots with their targets significantly enriched in specific functional categories. By integrating different sources of information, we identified putative trans- regulators for a variety of metabolic pathways. We demonstrated that the bHLH transcription factor R1 and hexokinase HEX9 might act as crucial regulators for flavonoid biosynthesis and glycolysis, respectively. Moreover, we showed that domestication or improvement has significantly affected global gene expression, with many genes targeted by selection. Of particular interest, the Bx genes for benzoxazinoid biosynthesis may have undergone coordinated cis-regulatory divergence between maize and teosinte, and a transposon insertion that inactivates Bx12 was under strong selection as maize spread into temperate environments with a distinct herbivore community.
Collapse
Affiliation(s)
- Xufeng Wang
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Qiuyue Chen
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Yaoyao Wu
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Zachary H Lemmon
- Department of Genetics, University of Wisconsin, Madison, WI 53706, USA
| | - Guanghui Xu
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Cheng Huang
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Yameng Liang
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Dingyi Xu
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - Dan Li
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China
| | - John F Doebley
- Department of Genetics, University of Wisconsin, Madison, WI 53706, USA
| | - Feng Tian
- National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, Laboratory of Crop Heterosis and Utilization, Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing 100193, China.
| |
Collapse
|
48
|
Block A, Christensen SA, Hunter CT, Alborn HT. Herbivore-derived fatty-acid amides elicit reactive oxygen species burst in plants. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:1235-1245. [PMID: 29301018 DOI: 10.1093/jxb/erx449] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 11/27/2017] [Indexed: 05/07/2023]
Abstract
Reactive oxygen species (ROS) can be elicited by many forms of stress, including pathogen attack, abiotic stress, damage and insect infestation. Perception of microbe- or damage-associated elicitors triggers an ROS burst in many plant species; however, the impact of herbivore fatty-acid amides on ROS elicitation remains largely unexplored. In this study we show that the lepidopteran-derived fatty-acid amide elicitor N-linolenoyl-L-glutamine (GLN18:3) can induce a ROS burst in multiple plant species. Furthermore, in Arabidopsis this ROS burst is partially dependent on the plasma membrane localized NADPH oxidases RBOHD and RBOHF, and an Arabidopsis rbohD/F double mutant produces enhanced GLN18:3-induced jasmonic acid. Quantification of GLN18:3-induced ROS in phytohormone-deficient lines revealed that in Arabidopsis reduced levels of jasmonic acid resulted in a larger elicitor-induced ROS burst, while in tomato reduction of either jasmonic acid or salicylic acid led to higher induced ROS production. These data indicate that GLN18:3-induced ROS is antagonistic to jasmonic acid production in these species. In biological assays, rbohD/F mutant plants were more resistant to the generalist herbivores Spodoptera exigua and Trichoplusia ni but not to the specialist Plutella xylostella. Collectively, these results demonstrate that in Arabidopsis herbivore-induced ROS may negatively regulate plant defense responses to herbivory.
Collapse
Affiliation(s)
- Anna Block
- Center for Medical, Agricultural and Veterinary Entomology, US Department of Agriculture-Agricultural Research Service, Gainesville, FL, USA
| | - Shawn A Christensen
- Center for Medical, Agricultural and Veterinary Entomology, US Department of Agriculture-Agricultural Research Service, Gainesville, FL, USA
| | - Charles T Hunter
- Center for Medical, Agricultural and Veterinary Entomology, US Department of Agriculture-Agricultural Research Service, Gainesville, FL, USA
| | - Hans T Alborn
- Center for Medical, Agricultural and Veterinary Entomology, US Department of Agriculture-Agricultural Research Service, Gainesville, FL, USA
| |
Collapse
|
49
|
Nyasembe VO, Tchouassi DP, Pirk CWW, Sole CL, Torto B. Host plant forensics and olfactory-based detection in Afro-tropical mosquito disease vectors. PLoS Negl Trop Dis 2018; 12:e0006185. [PMID: 29462150 PMCID: PMC5834208 DOI: 10.1371/journal.pntd.0006185] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 03/02/2018] [Accepted: 12/20/2017] [Indexed: 11/23/2022] Open
Abstract
The global spread of vector-borne diseases remains a worrying public health threat, raising the need for development of new combat strategies for vector control. Knowledge of vector ecology can be exploited in this regard, including plant feeding; a critical resource that mosquitoes of both sexes rely on for survival and other metabolic processes. However, the identity of plant species mosquitoes feed on in nature remains largely unknown. By testing the hypothesis about selectivity in plant feeding, we employed a DNA-based approach targeting trnH-psbA and matK genes and identified host plants of field-collected Afro-tropical mosquito vectors of dengue, Rift Valley fever and malaria being among the most important mosquito-borne diseases in East Africa. These included three plant species for Aedes aegypti (dengue), two for both Aedes mcintoshi and Aedes ochraceus (Rift Valley fever) and five for Anopheles gambiae (malaria). Since plant feeding is mediated by olfactory cues, we further sought to identify specific odor signatures that may modulate host plant location. Using coupled gas chromatography (GC)-electroantennographic detection, GC/mass spectrometry and electroantennogram analyses, we identified a total of 21 antennally-active components variably detected by Ae. aegypti, Ae. mcintoshi and An. gambiae from their respective host plants. Whereas Ae. aegypti predominantly detected benzenoids, Ae. mcintoshi detected mainly aldehydes while An. gambiae detected sesquiterpenes and alkenes. Interestingly, the monoterpenes β-myrcene and (E)-β-ocimene were consistently detected by all the mosquito species and present in all the identified host plants, suggesting that they may serve as signature cues in plant location. This study highlights the utility of molecular approaches in identifying specific vector-plant associations, which can be exploited in maximizing control strategies such as such as attractive toxic sugar bait and odor-bait technology.
Collapse
Affiliation(s)
- Vincent O. Nyasembe
- International Centre of Insect Physiology and Ecology, Nairobi, Kenya
- Department of Zoology and Entomology, University of Pretoria, Hatfield, South Africa
| | | | - Christian W. W. Pirk
- Department of Zoology and Entomology, University of Pretoria, Hatfield, South Africa
| | - Catherine L. Sole
- Department of Zoology and Entomology, University of Pretoria, Hatfield, South Africa
| | - Baldwyn Torto
- International Centre of Insect Physiology and Ecology, Nairobi, Kenya
- Department of Zoology and Entomology, University of Pretoria, Hatfield, South Africa
| |
Collapse
|
50
|
Aljbory Z, Chen MS. Indirect plant defense against insect herbivores: a review. INSECT SCIENCE 2018; 25:2-23. [PMID: 28035791 DOI: 10.1111/1744-7917.12436] [Citation(s) in RCA: 130] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 12/06/2016] [Accepted: 12/20/2016] [Indexed: 05/09/2023]
Abstract
Plants respond to herbivore attack by launching 2 types of defenses: direct defense and indirect defense. Direct defense includes all plant traits that increase the resistance of host plants to insect herbivores by affecting the physiology and/or behavior of the attackers. Indirect defense includes all traits that by themselves do not have significant direct impact on the attacking herbivores, but can attract natural enemies of the herbivores and thus reduce plant loss. When plants recognize herbivore-associated elicitors, they produce and release a blend of volatiles that can attract predators, parasites, and other natural enemies. Known herbivore-associated elicitors include fatty acid-amino acid conjugates, sulfur-containing fatty acids, fragments of cell walls, peptides, esters, and enzymes. Identified plant volatiles include terpenes, nitrogenous compounds, and indoles. In addition, constitive traits including extrafloral nectars, food bodies, and domatia can be further induced to higher levels and attract natural enemies as well as provide food and shelter to carnivores. A better understanding of indirect plant defense at global and componential levels via advanced high throughput technologies may lead to utilization of indirect defense in suppression of herbivore damage to plants.
Collapse
Affiliation(s)
- Zainab Aljbory
- Department of Entomology, Kansas State University, Manhattan, Kansas, USA
| | - Ming-Shun Chen
- Department of Entomology, Kansas State University, Manhattan, Kansas, USA
- Hard Winter Wheat Genetics Research Unit, USDA-ARS, Kansas State University, Manhattan, Kansas, USA
| |
Collapse
|