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Chen H, Yuan YW. Genetic basis of nectar guide trichome variation between bumblebee- and self-pollinated monkeyflowers (Mimulus): role of the MIXTA-like gene GUIDELESS. BMC Plant Biol 2024; 24:62. [PMID: 38262916 PMCID: PMC10804488 DOI: 10.1186/s12870-024-04736-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/09/2024] [Indexed: 01/25/2024]
Abstract
Nectar guide trichomes play crucial ecological roles in bee-pollinated flowers, as they serve as footholds and guides for foraging bees to access the floral rewards. However, the genetic basis of natural variation in nectar guide trichomes among species remains poorly understood. In this study, we performed genetic analysis of nectar guide trichome variation between two closely related monkeyflower (Mimulus) species, the bumblebee-pollinated Mimulus lewisii and self-pollinated M. parishii. We demonstrate that a MIXTA-like R2R3-MYB gene, GUIDELESS, is a major contributor to the nectar guide trichome length variation between the two species. The short-haired M. parishii carries a recessive allele due to non-synonymous substitutions in a highly conserved motif among MIXTA-like MYB proteins. Furthermore, our results suggest that besides GUIDELESS, additional loci encoding repressors of trichome elongation also contribute to the transition from bumblebee-pollination to selfing. Taken together, these results suggest that during a pollination syndrome switch, changes in seemingly complex traits such as nectar guide trichomes could have a relatively simple genetic basis, involving just a few genes of large effects.
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Affiliation(s)
- Hongfei Chen
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269, USA.
| | - Yao-Wu Yuan
- Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, 06269, USA.
- Institute for Systems Genomics, University of Connecticut, Storrs, CT, 06269, USA.
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Lee S, Cassone BJ, Wijeratne A, Jun TH, Michel AP, Mian MR. Transcriptomic dynamics in soybean near-isogenic lines differing in alleles for an aphid resistance gene, following infestation by soybean aphid biotype 2. BMC Genomics 2017; 18:472. [PMID: 28645245 PMCID: PMC5481885 DOI: 10.1186/s12864-017-3829-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 05/30/2017] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Genetic resistance of soybean [Glycine max (L.) Merr] against Aphis glycines provides effective management of this invasive pest, though the underlying molecular mechanisms are largely unknown. This study aimed to investigate genome-wide changes in gene expressions of soybean near-isogenic lines (NILs) either with the Rag5 allele for resistance or the rag5 allele for susceptibility to the aphid following infestation with soybean aphid biotype 2. RESULTS The resistant (R)-NIL responded more rapidly to aphid infestation than the susceptible (S)-NIL, with differential expressions of 2496 genes during first 12 h of infestation (hai), compared to the aphid-free control. Although the majority of the differentially expressed genes (DEGs) in the R-NIL also responded to aphid infestation in S-NIL, overall the response time was longer and/or the magnitude of change was smaller in the S-NIL. In addition, 915 DEGs in R-NIL continued to be regulated at all time points (0, 6, 12, and 48 hai), while only 20 DEGs did so in S-NIL. Enriched gene ontology of the 2496 DEGs involved in plant defense responses including primary metabolite catalysis, oxidative stress reduction, and phytohormone-related signaling. By comparing R- vs. S-NIL, a total of 556 DEGs were identified. Of the 13 genes annotated in a 120-kb window of the Rag5 locus, two genes (Glyma.13 g190200 and Glyma.13 g190600) were differentially expressed (upregulated in S- or R-NIL), and another gene (Glyma.13 g190500) was induced up to 4-fold in the R-NIL at 6 and 12 h following aphid infestation. CONCLUSIONS This study strengthens our understanding of the defense dynamics in compatible and incompatible interactions of soybean and soybean aphid biotype 2. Several DEGs (e.g., Glyma.13 g190200, Glyma.13 g190500, and Glyma.13 g190600) near the Rag5 locus are strong candidate genes for further investigations.
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Affiliation(s)
- Sungwoo Lee
- Department of Entomology, Ohio Agricultural Research and Development Center (OARDC), The Ohio State University, Wooster, OH 44691 USA
- Present Address: Department of Crop Science, Chungnam National University, Daejeon, 34341 South Korea
| | - Bryan J. Cassone
- Department of Plant Pathology, Ohio Agricultural Research and Development Center (OARDC), The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691 USA
- Present Address: Department of Biology, Brandon University, Brandon, MB R7A 6A9 Canada
| | - Asela Wijeratne
- Molecular and Cellular Imaging Center, The Ohio State University/OARDC, Wooster, OH 44691 USA
- Present Address: Department of Biological Sciences, University of Memphis, 3774 Walker Avenue, Memphis, TN 38152 USA
| | - Tae-Hwan Jun
- Department of Entomology, Ohio Agricultural Research and Development Center (OARDC), The Ohio State University, Wooster, OH 44691 USA
- Present Address: Department of Plant Bioscience, Pusan National University, Busan, 609-735 South Korea
| | - Andrew P. Michel
- Department of Entomology, Ohio Agricultural Research and Development Center (OARDC), The Ohio State University, Wooster, OH 44691 USA
| | - M.A. Rouf Mian
- Corn, Soybean, Soft Wheat Quality Unit, USDA-ARS, Wooster, OH 44691 USA
- Present Address: Soybean Nitrogen Fixation Unit, USDA-ARS, 3127 Ligon Street, Raleigh, NC 27606 USA
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Xu P, Gao J, Cao Z, Chee PW, Guo Q, Xu Z, Paterson AH, Zhang X, Shen X. Fine mapping and candidate gene analysis of qFL-chr1, a fiber length QTL in cotton. Theor Appl Genet 2017; 130:1309-1319. [PMID: 28361363 DOI: 10.1007/s00122-017-2890-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2016] [Accepted: 03/02/2017] [Indexed: 05/20/2023]
Abstract
A fiber length QTL, qFL-chr1, was fine mapped to a 0.9 cM interval of cotton chromosome 1. Two positional candidate genes showed positive correlation between gene expression level and fiber length. Prior analysis of a backcross-self mapping population derived from a cross between Gossypium hirsutum L. and G. barbadense L. revealed a QTL on chromosome 1 associated with increased fiber length (qFL-chr1), which was confirmed in three independent populations of near-isogenic introgression lines (NIILs). Here, a single NIIL, R01-40-08, was used to develop a large population segregating for the target region. Twenty-two PCR-based polymorphic markers used to genotype 1672 BC4F2 plants identified 432 recombinants containing breakpoints in the target region. Substitution mapping using 141 informative recombinants narrowed the position of qFL-chr1 to a 1.0-cM interval between SSR markers MUSS084 and CIR018. To exclude possible effects of non-target introgressions on fiber length, different heterozygous BC4F3 plants introgressed between SSR markers NAU3384 and CGR5144 were selected to develop sub-NILs. The qFL-chr1 was further mapped at 0.9-cM interval between MUSS422 and CIR018 by comparisons of sub-NIL phenotype, and increased fiber length by ~1 mm. The 2.38-Mb region between MUSS422 and CIR018 in G. barbadense contained 19 annotated genes. Expression levels of two of these genes, GOBAR07705 (encoding 1-aminocyclopropane-1-carboxylate synthase) and GOBAR25992 (encoding amino acid permease), were positively correlated with fiber length in a small F2 population, supporting these genes as candidates for qFL-chr1.
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Affiliation(s)
- Peng Xu
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Jin Gao
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Zhibin Cao
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Peng W Chee
- Molecular Cotton Breeding Laboratory, University of Georgia, Tifton, GA, 3179, USA
| | - Qi Guo
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Zhenzhen Xu
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Andrew H Paterson
- Plant Genome Mapping Laboratory, University of Georgia, Athens, GA, 30602, USA
| | - Xianggui Zhang
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China
| | - Xinlian Shen
- Key Laboratory of Cotton and Rapeseed (Nanjing), Ministry of Agriculture, Nanjing, People's Republic of China.
- The Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, People's Republic of China.
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