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Acta Agronomica Sinica ›› 2022, Vol. 48 ›› Issue (7): 1635-1644.doi: 10.3724/SP.J.1006.2022.14106


Functional validation of Bna-novel-miR36421 regulating plant architecture and flower organ development in Arabidopsis thaliana

DAI Li-Shi1,2(), CHANG Wei1,2(), ZHANG Sai1,2, QIAN Ming-Chao1,2, LI Xiao-Dong1,2, ZHANG Kai1,2, LI Jia-Na1,2,3, QU Cun-Min1,2,3,*(), LU Kun1,2,3,*()   

  1. 1College of Agronomy and Biotechnology, Southwest University, Chongqing 400715, China
    2Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing 400715, China
    3Academy of Agricultural Sciences, Southwest University, Chongqing, 400715, China
  • Received:2021-06-22 Accepted:2021-10-19 Online:2022-07-12 Published:2021-11-03
  • Contact: QU Cun-Min,LU Kun E-mail:dls375684@163.com;changwei1919@163.com;drqucunmin@swu.edu.cn;drlukun@swu.edu.cn
  • About author:First author contact:

    ** Contributed equally to this work

  • Supported by:
    National Natural Science Foundation of China(31871653);National Key Research and Development Plan(2018YFD0100500);Project of Intellectual Base for Discipline Innovation in Colleges and Universities “the 111 Project”(B12006);Key Project of Natural Science Foundation;Germplasm Creation Special Program of Southwest University


MicroRNA is involved in the regulation of various biological processes such as development, stress response, and embryonic development in rapeseed, however, only few studies focused on the regulation of miRNA on the plant architecture and floral organ development of rapeseed. In this study, Bna-novel-miR36421 that differentially expressed between the high and low harvest index accessions of rapeseed was identified, whose biological function and regulation mechanism were further characterized through phenotype analysis in transgenic plants, target gene prediction, expression pattern comparison, and dual luciferase reporter system. The results showed that Bna-novel-miR36421 was highly homologous to miR167 family members, and might be a novel miR167 member in rapeseed. The qRT-PCR and dual luciferase reporter system results indicated that Bna-novel-miR36421 could inhibit the relative expression levels of Bna.C03ARF6, Bna.C06ARF8, Bna.A09PATL2, and Bna.C03DUF581. In the overexpressing Arabidopsis plants, the expression of Bna-novel-miR36421 was significantly increased, while the transcription levels of the Arabidopsis orthologs of its target genes were decreased significantly. Phenotypic observation showed that the plant height of overexpression Arabidopsis plants were reduced, with shortened stems and curled leaves. The development of floral organs was abnormal, with enlarged pistil, shortened stamen filaments, unbreakable anthers, and aborted pollens. Hence, it could be proposed that Bna-novel-miR36421 may regulate plant architecture and floral organ development by repressing Bna.C03ARF6, Bna.C06ARF8, Bna.A09PATL2, and Bna.C03DUF581. The results laid a solid foundation for understanding the molecular mechanism of miRNA-mediated plant architecture and flower organ development, and mining the key genes involved in plant developmental processes.

Key words: Brassica napus, Bna-novel-miR36421, miRNA167, plant architecture, flower organ

Table S1

Bna-novel-miR36421 mature sequence and precursor sequence"

Sequence (5'-3')
Mature sequence
Precursor sequence-1
Precursor sequence-2

Table S2

Primers used in this study"

Prime name
Primer sequence (5'-3')
62sk-miR36421F taagcttgatatcgaattcCAATATGAGATTTCGCAGTGACT
62sk-miR36421R cgctctagaactagtggatccCAAACACAACTAACCTTC
0800-C03ARF6F ttctagagcggccgcggatccGGTACAATGACGACACCTTCTAG
0800-C03ARF6R actggtgatttcagcgaattcTCCCCAAGTCATCACAGTTC
0800-C06ARF8F ttctagagcggccgcggatccCTGGATTTCAGAACACTTTGC
0800-C06ARF8R actggtgatttcagcgaattcGAAATGGGTGAGGTTCTGTG
0800-C03DUF581F ttctagagcggccgcggatccATGACTAAAATCTCTGTTGG
0800-C03DUF581R actggtgatttcagcgaattcAGGAACTATAAATAGCTGGCGT
0800-A09PATL2R actggtgatttcagcgaattcGACACGTTGTGATCTACAGCTCGT

Fig. 1

Prediction of secondary stem-loop structure of precursors of Bna-novel-miR36421 A: secondary stem loop structure of Bna-novel-MIR36421-1, dG = -26.500 kcal mol-1; B: secondary stem loop structure of Bna-novel-MIR36421-2, dG = -63.90 kcal mol-1."

Fig. 2

Sequence alignment of mature miRNAs between Bna-novel-miR36421 and rapeseed Bna-miR167 family members A: mature miRNAs alignments; B: precursor miRNAs alignments."

Fig. 3

Relative expression level and phenotypic observation of Bna-novel-miR36421 overexpression transgenic plants inArabidopsis thaliana A: detection of the relative expression level of Bna-novel-miR36421 in transgenic Arabidopsis thaliana. B: phenotypic observation of Bna-novel-miR36421 overexpression transgenic plants in Arabidopsis thaliana. C: phenotypic data statistics of Bna-novel-miR36421 overexpression transgenic plants in Arabidopsis thaliana. *, **, and **** represent significant difference at the 0.05, 0.01, and 0.0001 probability levels, respectively. NS: not significant difference."

Fig. 4

Relative expression levels of Bna-novel-miR36421 and its target genes expression in different materials and tissues P130: high harvest index material of Brassica napus; P202: low harvest index material of Brassica napus; 14dSe: 14 d seed; 14dSp: 14 d silique pericarp; 28dSe: 28 d seed; 28dSp: 28 d silique pericarp. **: P < 0.01."

Fig. 5

Bna-novel-miR36421 negatively regulates its target genes A: the relationship between Bna-novel-miR36421 and target genes validated by dual-luciferase reporter assays; B: qRT-PCR detection of Bna-novel-miR36421 and its target genes expression. **: P < 0.01."

Fig. 6

Proposed model of Bna-novel-miR36421 involved in regulation of plant architecture and floral organ development in rapeseed"

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