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Activation of an endogenous pararetrovirus, petunia vein clearing virus, during long-term cultivation of host plants is associated with disturbance of star-type floral color pattern in Petunia hybrida

ABSTRACT: Activation of an endogenous pararetrovirus, petunia vein clearing virus, during long-term cultivation of host plants is associated with disturbance of star-type floral color pattern in Petunia hybrida

PROVIDER: PRJNA607027 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11095749.fastq.gz	Fastqsanger.gz
	SRR11095750.fastq.gz	Fastqsanger.gz
	SRR11095751.fastq.gz	Fastqsanger.gz
	SRR11095752.fastq.gz	Fastqsanger.gz
	SRR11095753.fastq.gz	Fastqsanger.gz

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Activation of an endogenous pararetrovirus, petunia vein clearing virus, during long-term cultivation of host plants is associated with disturbance of star-type floral color pattern in Petunia hybrida

Project description:White areas of star-type bicolor petals of petunia (Petunia hybrida) are caused by post-transcriptional gene silencing (PTGS) of the key enzyme of anthocyanin biosynthesis. We observed blotched flowers and vein-clearing symptom in leaves in 3- to 4-month-old petunia plants. In order to determine the cause of blotched flowers, we examined an endogenous pararetrovirus, petunia vein clearing virus (PVCV), because this virus causes vein-clearing symptom and may have a suppressor of PTGS. Transcripts and episomal DNA derived from proviral PVCV loci highly accumulated in 3- to 4-month-old plants, indicating that PVCV was activated as the host plant ages. Furthermore, CG and CHG sites of the promoter region of PVCV were highly methylated in 1-month-old plants but these cytosines were not methylated in 3- to 4-month-old plants, suggesting that poor maintenance of DNA methylation activates propagation of PVCV. In parallel, de novo methylation at CHH sites and 24-nt small RNAs were detected on the promoter region of PVCV, indicating that RNA-directed DNA methylation was induced by PVCV activation. Detections of transcripts and episomal DNA of PVCV in blotched regions and suppressor activity of PTGS support the mechanism that suppression of PTGS by activated PVCV causes blotched flowers.

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