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Int J Mol Sci
2022 Sep 10;2318:. doi: 10.3390/ijms231810485.
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Genome-Wide Analysis of the Growth-Regulating Factor (GRF) Family in Aquatic Plants and Their Roles in the ABA-Induced Turion Formation of Spirodela polyrhiza.
Li G
,
Chen Y
,
Zhao X
,
Yang J
,
Wang X
,
Li X
,
Hu S
,
Hou H
.
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Growth-regulating factors (GRFs) are plant-specific transcription factors that play essential roles in regulating plant growth and stress response. The GRF gene families have been described in several terrestrial plants, but a comprehensive analysis of these genes in diverse aquatic species has not been reported yet. In this study, we identified 130 GRF genes in 13 aquatic plants, including floating plants (Azolla filiculoides, Wolffia australiana, Lemna minuta, Spirodela intermedia, and Spirodela polyrhiza), floating-leaved plants (Nymphaea colorata and Euryale ferox), submersed plants (Zostera marina, Ceratophyllum demersum, Aldrovanda vesiculosa, and Utricularia gibba), an emergent plant (Nelumbo nucifera), and an amphibious plant (Cladopus chinensis). The gene structures, motifs, and cis-acting regulatory elements of these genes were analyzed. Phylogenetic analysis divided these GRFs into five clusters, and ABRE cis-elements were highly enriched in the promoter region of the GRFs in floating plants. We found that abscisic acid (ABA) is efficient at inducing the turion of Spirodela polyrhiza (giant duckweed), accompanied by the fluctuated expression of SpGRF genes in their fronds. Our results provide information about the GRF gene family in aquatic species and lay the foundation for future studies on the functions of these genes.
2017YFE0128800 National Key Research and Development Program of China, 31870384 National Natural Science Foundation of China, 32101254 National Natural Science Foundation of China, 152342KYSB20200021 International Partnership Program of the Chinese Academy of Sciences
Figure 1. Calculations of the GRFs in A. thaliana and 13 aquatic plants.
Figure 2. Phylogenetic analysis of the GRFs in A. thaliana and 13 aquatic plants. The neighbor-joining (NJ) phylogenetic tree was generated by MEGA 7.0 with 1000 bootstrap replications on the JTT model. The 139 GRFs were divided into five groups (A–E named by numbers of genes and indicated by five different colors), and the GRFs from different species were labeled with different colored symbols. Tomato circles indicate genes from A. thaliana; Dark orange circles indicate genes from A. filiculoides; Maroon circles indicate genes from A. vesiculosa; Gold circles indicate genes from C. chinensis; Yellow circles indicate genes from C. demersum; Dark gold circles indicate genes from E. ferox; Blue circles indicate genes from U. gibba; Dodger blue circles indicate genes from N. colorata; Medium orchid circles indicate genes from N. nucifera; Cyan circles indicate genes from Z. marina; Deep sky blue triangles indicate genes from L. minuta; Purple triangles indicate genes from S. intermedia; Black triangles indicate genes from S. polyrhiza; Yellow triangles indicate genes from W. australiana.
Figure 3. Gene structures of the GRFs. The GRFs from different species were labeled with different colored symbols. Tomato circles indicate genes from A. thaliana; Dark orange circles indicate genes from A. filiculoides; Maroon circles indicate genes from A. vesiculosa; Gold circles indicate genes from C. chinensis; Yellow circles indicate genes from C. demersum; Dark gold circles indicate genes from E. ferox; Blue circles indicate genes from U. gibba; Dodger blue circles indicate genes from N. colorata; Medium orchid circles indicate genes from N. nucifera; Cyan circles indicate genes from Z. marina; Deep sky blue triangles indicate genes from L. minuta; Purple triangles indicate genes from S. intermedia; Black triangles indicate genes from S. polyrhiza; Yellow triangles indicate genes from W. australiana.
Figure 4. Conserved motifs of the GRFs. The GRFs from different species were labeled with different colored symbols. Tomato circles indicate genes from A. thaliana; Dark orange circles indicate genes from A. filiculoides; Maroon circles indicate genes from A. vesiculosa; Gold circles indicate genes from C. chinensis; Yellow circles indicate genes from C. demersum; Dark gold circles indicate genes from E. ferox; Blue circles indicate genes from U. gibba; Dodger blue circles indicate genes from N. colorata; Medium orchid circles indicate genes from N. nucifera; Cyan circles indicate genes from Z. marina; Deep sky blue triangles indicate genes from L. minuta; Purple triangles indicate genes from S. intermedia; Black triangles indicate genes from S. polyrhiza; Yellow triangles indicate genes from W. australiana.
Figure 5. Frequency of the main cis-elements in the 1.5 kb promoter of the 139 GRFs.
Figure 6. Chromosomal localization, gene collinearity, and synteny analysis of the SpGRFs. (A) Distribution of the SpGRF genes on the chromosomes of S. polyrhiza. The scale bar indicates chromosome length (Mb). (B) Gene collinearity of the SpGRF genes on the chromosomes of S. polyrhiza.
Figure 7. Synteny relationship of the GRF gene pairs between S. polyrhiza and four other plants. The red colour represents syntenic GRFs, and the gray lines show the collinear blocks of the plant genome. The chromosome number was labeled near each chromosome.
Figure 8. Phenotypes and expression of the SpGRFs in the frond and turion of S. polyrhiza. (A) Phenotypes of turion (left) and whole plant (right) of S. polyrhiza. Bar = 1 mm. Arrows indicate frond or roots of S. polyrhiza, separately. (B) Expression of the SpGRFs in the frond and turion. F1: SpGRF1 in the frond; F2: SpGRF2 in the frond; F3: SpGRF3 in the frond; F4: SpGRF4 in the frond; F5: SpGRF5 in the frond; F6: SpGRF6 in the frond; T1: SpGRF1 in the turion; T2: SpGRF2 in the turion; T3: SpGRF3 in the turion; T4: SpGRF4 in the turion; T5: SpGRF5 in the turion; T6: SpGRF6 in the turion. The different letters indicate statistically significant differences relative to F1, as determined by the Duncan test (p < 0.05).
Figure 9. Phenotypes and expression of the SpGRFs during the ABA-induced turion formation of S. polyrhiza. (A) Phenotypes of S. polyrhiza during the ABA-induced turion formation. Bars = 1 cm. (B) Expression of the SpGRFs in the fronds after the treatment. The different letters indicate statistically significant differences relative to 0 days, as determined by the Duncan test (p < 0.05).
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