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| The mechanism of miR171b synergistic regulation of rice traits revealed |
Rice is one of the most important food crops
.
Yield, growth period and resistance are the three key factors that antagonize each other in rice production
Recently, the Wang Wenming team of Sichuan Agricultural University published a research paper online in Acta Agronomica Sinica (English Edition), revealing that rice miR171b synergistically regulates rice blast resistance, yield and growth period through the SCL6-IIs gene
.
miRNA is a single-stranded RNA with an endogenous length of 19-24 bases, which can bind to the reverse complementary DNA or RNA, mediate RNA cleavage and block mRNA translation, and regulate the expression of target genes
.
Therefore, miRNA can coordinate plant growth, development and immunity well by targeting different genes
Recent studies have shown that miRNAs play an important role in coordinating rice yield traits and resistance
.
The transgenic material (OX171b) overexpressing miR171b has improved resistance to rice blast, enhanced resistance, and delayed flowering
Correlation analysis of the mutants of miR171b's target genes SCL6-IIa, SCL6-IIb and SCL6-IIc revealed that the mutants of these three target genes all showed similar phenotypes to OX171b, including increased resistance to rice blast and decreased yield And the growth period is prolonged, indicating that miR171b coordinates production, growth period and resistance through the SCL6-II gene
.
Further analysis of miR171b accumulation and target gene mRNA transcription levels in different tissues of leaves and ears during the whole growth period of rice showed that the dynamic expression of miR171b–SCL6-IIs modules in different organs during the whole growth period is beneficial to balance the growth and resistance of rice
.
During the vegetative growth stage, the accumulation of miR171b in the leaves gradually increases, while the expression of SCL6-II gene gradually decreases, thereby increasing the resistance of the leaves, which is beneficial to the growth of rice; when the rice enters the reproductive growth stage, the accumulation of miR171b in the panicle gradually decreases.
Related paper information: https://doi.
https://doi.
org/10.
1016/j.
cj.
2021.
05.
004
