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MiR2118-triggered phased siRNAs are differentially expressed during the panicle development of wild and domesticated African rice species

ABSTRACT: miR2118-triggered phased siRNAs are differentially expressed during the panicle development of wild and domesticated African rice species

OTHER RELATED OMICS DATASETS IN: GSE48346

PROVIDER: PRJNA209731 | ENA |

REPOSITORIES: ENA

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miR2118-triggered phased siRNAs are differentially expressed during the panicle development of wild and domesticated African rice species

Project description:Rice was domesticated independently in Asia and Africa, leading to two distinct but closely related crop species, Oryza sativa and Oryza glaberrima, respectively. The two domestications lead to morphological changes, in which a higher branching complexity of the panicles, influencing seed production and crop yield. Although much emphasis was placed on changes in transcriptional regulation during rice domestication and improvement, no large-scale study of small RNA regulation changes during domestication has been reported so far. To analyze whether rice domestication has altered the expression of small RNAs, we performed deep sequencing of small RNA transcriptomes from early developmental stages of panicles from 10 genotypes of the cultivated African species and 10 genotypes of its wild-relative O. barthii. Our study shows a drastic expression change of the 21-nucleotide smallRNA population. A total of 29% of these smallRNAs are overexpressed in panicles of O. barthii vs. O. glaberrima, corresponding mainly to 21-nucleotide phased siRNAs (or phasiRNAs). We also show that these changes are associated with a differential expression of a known regulator of phased siRNAs, miR2118 during early panicle development. Finally, these changes are associated to a heterochronic alteration of phasiRNAs and miR2118 expression pattern, during panicle development with a delayed expression in the domesticated species. Our study suggests a major reshaping of the regulation network from a specific class of small RNA during African rice domestication.

2016-04-18 | GSE48346 | GEO

miR2118-triggered phased siRNAs are differentially expressed during the panicle development of wild and domesticated African rice species.

Project description: Not available

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Down-regulated expression of OsDCL3b affects small RNA biogenesis and panicle development in rice

Project description:Two types of small (18-24 nt) non-coding RNAs (ncRNAs), microRNAs (miRNAs) and small interfering RNAs (siRNAs) have been found to exist widely in higher plants. OsDCL3b has just been reported to process the 24-nt phased small RNAs in rice, which are preferentially expressed in panicle. In this study, we find that down-regulated expression of OsDCL3b leads to lower pollen sterility and seed setting rate, which results in decreased grain yield per plant in rice. Next, small RNA and mRNA sequencing were performed to study the decrease of pollen fertility and seed setting rate. 942 differentially expressed genes were identified, and some of them have already been known to be involved in rice panicle development. Our results indicate that there is a close correlation between small RNA and rice yield.

2019-04-12 | GSE102747 | GEO

TarDB: an online database for plant miRNA targets and miRNA-triggered phased siRNAs.

Project description: Not available

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The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs [mRNA]

Project description:Plants evolved an array of disease resistance genes (R genes) to fight pathogens. In the absence of pathogen infection, NBS-LRR genes, which comprise a major subfamily of R genes, are suppressed by a small RNA cascade involving microRNAs (miRNAs) that trigger the biogenesis of phased siRNAs (phasiRNAs) from R gene transcripts. However, whether or how R genes influence small RNA biogenesis is unknown. In this study, we isolated a mutant with global defects in the biogenesis of miRNAs and phasiRNAs in Arabidopsis thaliana and traced the defects to the over accumulation and nuclear localization of an R protein SNC1. We showed that nuclear SNC1 represses the transcription of miRNA and phasiRNA loci, probably through the transcriptional corepressor TPR1. Intriguingly, nuclear SNC1 reduces the accumulation of phasiRNAs from three source R genes and concomitantly, the expression of a majority of the ~170 R genes was up-regulated. Taken together, this study reveals a new R gene-miRNA-phasiRNA regulatory module that regulates plants' growth-defense trade-off.

2018-10-09 | GSE111238 | GEO

The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs [small RNA]

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The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs [mRNA]

Project description:The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs [mRNA]

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bulked RILs with high and low grain number per panicle derived from 2 cultivars at panicle primordia stage

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ABERRANT PANICLE ORGANIZATION2 controls multiple steps in panicle formation through common direct-target genes

Project description:At the transition from vegetative to reproductive growth in rice, a developmental program change occurs, resulting in panicle (rice inflorescence) formation. The initial event of the transition is the change of the shoot apical meristem (SAM) to an inflorescence meristem (IM), accompanied by a rapid increase in the meristem size. Suppression of leaf growth also occurs, resulting in the formation of bracts. The IM generates branch meristems (BMs), indeterminate meristems that reiteratively generate next-order meristems. All meristems eventually acquire a determinate spikelet meristem identity and terminate after producing a floret. ABERRANT PANICLE ORGANIZATION2 (APO2) is the rice ortholog of Arabidopsis (Arabidopsis thaliana) LEAFY (LFY), a plant-specific transcription factor. APO2 is a positive regulator of panicle branch formation. Here, we show that APO2 is also required to increase the meristem size of the IM and suppress bract outgrowth. We identified genes directly and indirectly regulated by APO2 and identified APO2-binding sites by ChIP-seq analysis. These analyses showed that APO2 directly controls known regulators of panicle development, including SQUAMOSA PROMOTER BINDING PROTEIN LIKE14 and NECK LEAF1. Furthermore, we revealed that a set of genes act as downstream regulators of APO2 in controlling meristem cell proliferation at the reproductive transition, bract suppression, and panicle branch formation. Our findings indicate that APO2 acts as a master regulator of rice panicle development by regulating multiple steps in the reproductive transition through directly controlling a set of genes.

2024-04-09 | GSE263431 | GEO

The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs in Arabidopsis

Project description:The disease resistance protein SNC1 represses the biogenesis of microRNAs and phased siRNAs in Arabidopsis

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