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In plants, high disease resistance often results in a fitness penalty to plant growth. Therefore, breeding crops with a balanced yield and disease resistance has become a major challenge. Recently, microRNA (miRNA)-mediated R gene turnover has been shown to be a protective mechanism for plants to prevent autoimmunity in the absence of pathogens. However, whether these miRNAs play a role in plant growth and how miRNA-mediated R gene turnover responds to pathogen infection have been rarely explored. Here, we identified the Brassica miRNA, miR1885, targets both immune receptor gene and development-related gene for negative regulation through distinct modes of action. MiR1885 directly silences a TIR-NBS-LRR class of R gene BraTNL1 but represses the expression of photosynthesis-related gene BraCP24 through Trans-Acting Silencing (TAS) gene BraTIR1-mediated silencing. We found that, under natural conditions, miR1885 was kept in low levels to maintain normal development and basal immunity but peaked during the floral transition to promote flowering. Interestingly, upon Turnip mosaic virus (TuMV) infection, miR1885-dependent trans-acting silencing of BraCP24 was enhanced to speed up floral transition, whereas miR1885-mediated R gene turnover was overwhelmed by TuMV-induced BraTNL1 expression, reflecting an integrative regulation of the arms race between plants and pathogens. Collectively, our results demonstrate that a single Brassica miRNA dynamically regulates both innate immunity and plant growth and responds to viral infection, therefore demonstrating an integrative strategy for Brassica in modulating the interplay between growth, immunity and pathogen infection.
This article was published in the following journal.
Name: Molecular plant
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A plant genus of the family Cruciferae. It contains many species and cultivars used as food including cabbage, cauliflower, broccoli, Brussel sprouts, kale, collard greens, MUSTARD PLANT; (B. alba, B. junica, and B. nigra), turnips (BRASSICA NAPUS) and rapeseed (BRASSICA RAPA).
Any of several BRASSICA species that are commonly called mustard. Brassica alba is white mustard, B. juncea is brown or Chinese mustard, and B. nigra is black, brown, or red mustard. The plant is grown both for mustard seed from which oil is extracted and for greens or animal feed. It was formerly used as an emetic, counter-irritant, and carminative. There is no relationship to MUSTARD COMPOUNDS.
Endogenous or exogenous substances which inhibit the normal growth of human and animal cells or micro-organisms, as distinguished from those affecting plant growth (= PLANT GROWTH REGULATORS).
An SH2 domain-containing non-receptor tyrosine kinase that regulates signal transduction downstream of a variety of receptors including B-CELL ANTIGEN RECEPTORS. It functions in both INNATE IMMUNITY and ADAPTIVE IMMUNITY and also mediates signaling in CELL ADHESION; OSTEOGENESIS; PLATELET ACTIVATION; and vascular development.
A plant species of the family BRASSICACEAE best known for the edible roots.
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