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Multi-Omics Approaches Explain the Growth-Promoting Effect of the Apocarotenoid Growth Regulator Zaxinone in Rice

ABSTRACT: Multi-Omics Approaches Explain the Growth-Promoting Effect of the Apocarotenoid Growth Regulator Zaxinone in Rice

PROVIDER: PRJNA764923 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15993100_1.fastq.gz	Fastqsanger.gz
	SRR15993100_2.fastq.gz	Fastqsanger.gz
	SRR15993101_1.fastq.gz	Fastqsanger.gz
	SRR15993101_2.fastq.gz	Fastqsanger.gz
	SRR15993102_1.fastq.gz	Fastqsanger.gz

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Multi-Omics Approaches Explain the Growth-Promoting Effect of the Apocarotenoid Growth Regulator Zaxinone in Rice

2021-09-23 | GSE184529 | GEO

Multi-omics approaches explain the growth-promoting effect of the apocarotenoid growth regulator zaxinone in rice.

Project description:The apocarotenoid zaxinone promotes growth and suppresses strigolactone biosynthesis in rice. To shed light on the mechanisms underlying its growth-promoting effect, we employed a combined omics approach integrating transcriptomics and metabolomics analysis of rice seedlings treated with zaxinone, and determined the resulting changes at the cellular and hormonal levels. Metabolites as well as transcripts analysis demonstrate that zaxinone application increased sugar content and triggered glycolysis, the tricarboxylic acid cycle and other sugar-related metabolic processes in rice roots. In addition, zaxinone treatment led to an increased root starch content and induced glycosylation of cytokinins. The transcriptomic, metabolic and hormonal changes were accompanied by striking alterations of roots at cellular level, which showed an increase in apex length, diameter, and the number of cells and cortex cell layers. Remarkably, zaxinone did not affect the metabolism of roots in a strigolactone deficient mutant, suggesting an essential role of strigolactone in the zaxinone growth-promoting activity. Taken together, our results unravel zaxinone as a global regulator of the transcriptome and metabolome, as well as of hormonal and cellular composition of rice roots. Moreover, they suggest that zaxinone promotes rice growth most likely by increasing sugar uptake and metabolism, and reinforce the potential of this compound in increasing rice performance.

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Project description:Natural killer (NK) cells are present in large populations at the maternal-fetal interface during early pregnancy, but their roles in fetal growth are unclear. Here, we identify a CD49a+Eomes+ subset of NK cells that have the capability to secrete growth-promoting-factors (GPF), including pleiotrophin, osteoglycin and osteopontin in both humans and mice. Decreases in this GPF-secreting NK subset impair fetal development, and leads to fetal growth restriction. The transcriptional factor Nfil3 but not T-bet affects the function and the number of this decidual NK subset. The crosstalk of the HLA-G-ILT2-KIR2DL4 axis promotes the GPF-secreting function of this NK subset. Adoptive transfer of these induced CD49a+Eomes+NK cells can reverse the impaired fetal growth and rebuild an appropriate local microenvironment. These findings reveal new properties of NK cells in promoting fetal growth as well as novel approaches for therapeutically administering NK cells to reverse restricted nourishments within the microenvironment during early pregnancy. To investigate novel molecular signatures of human decidual NK cells, we performed microarray analysis on dNK cells (CD3−CD56+CD49a+CD49b−) and pNK cells (CD3−CD56+CD49a−CD49b+). dNK cells were purified from first-trimester deciduas. pNK cells were purified from adult peripheral blood mononuclear cells. Samples were collected from healthy adult donors after obtaining informed consent according to the Ethics Committee of the University of Science & Technology of China.

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Project description:The aim of our study is to elucidate the gene expression changes in rice in response to colonization by a plant growth promoting rhizobacteria such as the Bacillus subtilis through microarray high throughput technology. In particular, the effect of B.subtilis on root exudation (secretion of phytochemicals through roots) will be analysed. For this rice plantlets were grown in hydroponics and treated with B.subtilis RR4 for 48 hrs. The root samples of the control and treated plants were then used for the microarray experiment. The data obtained through microarray revealed genes related to cell wall modification, phytohormone synthesis, defense response, root exudation, etc. to be differentially regulated in response to B.subtilis RR4. Real time PCR analysis of few chosen genes (OsMS, OsALMT, OsABC, OsSDH, etc) also confirmed the validity of the microarray data. The initial responses of a plant in response to colonization by the microbe will be changes in cell wall of the plant tissues and the secretion of phytochemicals to attract/repel the colonizing beneficial/pathogenic organism. From analysis of microarray data we found the cell wall related genes which aid in root colonization and the root exudate related genes (biosynthesis and transport) which play a role in providing nutrition for the bacterial growth to be differentially regulated significantly. Analysis of specific genes and their biosynthesis pathways indicated that rice plants responded positively to root colonization by B.subtilis RR4. Notable among the exudation related genes such as Malate synthase and ALMT were found to be upregulated which indicates the significant role played by organic acids particularly malate in recruiting the PGPR towards the plant roots. This recruitment will thereby facilitate plant growth. Subsequently, these genes can be engineered in crop plants to recruit beneficial bacteria which might further open new avenues for improved crop production.

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