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Paphiopedilum armeniacum

ABSTRACT: Paphiopedilum armeniacum overview

PROVIDER: PRJNA427848 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24757357_1.fastq.gz	Fastqsanger.gz
	SRR24757357_2.fastq.gz	Fastqsanger.gz
	SRR24757358_1.fastq.gz	Fastqsanger.gz
	SRR24757358_2.fastq.gz	Fastqsanger.gz
	SRR24757359_1.fastq.gz	Fastqsanger.gz

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Abscisic Acid Inhibits Asymbiotic Germination of Immature Seeds of Paphiopedilum armeniacum.

Project description:Paphiopedilum armeniacum is a rare orchid native to China with high ornamental value. The germination of P. armeniacum seeds is difficult, especially for the mature seeds, which is the major limitation for their large-scale reproduction. This study explored the reasons for seed germination inhibition from the aspects of the important plant endogenous hormone-abscisic acid (ABA). The major endogenous hormone contents of seeds were determined at different developmental stages. The ABA content was 5.8 ng/g in 73 days after pollination (DAP) for the immature seeds, peaked at 14.6 ng/g in 129 DAP seeds, and dropped to 2.6 ng/g in the late mature stage of the 150 DAP seeds. The reduction of ABA content in the mature seed suggests a possible contribution to the increased expression of CYP707A, an ABA catabolism gene. The germination rate of the immature seeds was reduced to 9% from 69% when 5 μg/mL ABA was added to the Hyponex N026 germination medium. The result showed that ABA can inhibit the germination of P. armeniacum immature seeds. However, for the heavily lignified mature seeds, reduction in endogenous ABA level does not result in an increase in the germination rate. Lignin accumulation in the seed coat imposes the physical dormancy for P. armeniacum. In summary, the germination of P. armeniacum is regulated by both ABA and lignin accumulation.

| S-EPMC7768472 | biostudies-literature

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