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Transcriptome profiling of Arabidopsis tac1 and lazy1 mutant shoot tips under normal and gravistimulated conditions

ABSTRACT: Transcriptome profiling of Arabidopsis tac1 and lazy1 mutant shoot tips under normal and gravistimulated conditions

PROVIDER: PRJNA613599 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11356178.fastq.gz	Fastqsanger.gz
	SRR11356179.fastq.gz	Fastqsanger.gz
	SRR11356180.fastq.gz	Fastqsanger.gz
	SRR11356181.fastq.gz	Fastqsanger.gz
	SRR11356182.fastq.gz	Fastqsanger.gz

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Transcriptome profiling of Arabidopsis tac1 and lazy1 mutant shoot tips under normal and gravistimulated conditions

Project description:This data is was generated in connection with a study on the 'Opposing influences of TAC1 and LAZY1 on Lateral Shoot Orientation in Arabidopsis'. RNA was extracted from individual shoot tips from wild type (Columbia; Col), tac1, and lazy1 plants that experienced either 0 or 45 minutes of gravistimulation by 90-degree reorientation. The summary of the entire project is as follows: TAC1 and LAZY1 are members of a gene family that regulates lateral shoot orientation in plants. TAC1 promotes outward orientations in response to light, while LAZY1 promotes upward shoot orientations in response to gravity via altered auxin transport. We performed genetic, molecular, and biochemical assays to investigate possible interactions between these genes. In Arabidopsis they were expressed in similar tissues and double mutants revealed the wide-angled lazy1 branch phenotype, indicating it is epistatic to the tac1 shoot phenotype. Surprisingly, the lack of TAC1 did not influence gravitropic shoot curvature responses. Combined, these results suggest TAC1 might negatively regulate LAZY1 to promote outward shoot orientations. However, additional results revealed that TAC1- and LAZY1 influence on shoot orientation is more complex than a simple direct negative regulatory pathway. Transcriptomes of Arabidopsis tac1 and lazy1 mutants compared to wild type under normal and gravistimulated conditions revealed few overlapping differentially expressed genes. Overexpression of each gene did not result in major branch angle differences. Shoot tip hormone levels were similar between tac1, lazy1, and Col, apart from exceptionally elevated levels of salicylic acid in lazy1. The data presented here provide a foundation for future study of TAC1 and LAZY1 regulation of shoot architecture.

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Light quality affects the expression of stress and defense response genes in potato (Solanum tuberosum L.) shoot tips during post-cryopreservation recovery

Project description:Light intensity and spectral quality are two important factors that affect the cryopreservation success of plant germplasm. In a previous study, we found that LEDs with 90% red and 10% blue (RB) light have a positive effect on potato (Solanum tuberosum L.) shoot tip recovery during post-cryopreservation regeneration. In the present study, transcriptome profiles of non-cryopreserved (-) and cryopreserved (+) potato shoot tips exposed to RB, cool white fluorescent tubes (CW) and full darkness (D) were compared. Results indicated that light spectrum significantly affects transcript numbers in post-cryopreserved samples resulting in 3,284 differentially expressed genes of recovering shoot tips exposed to CW, RB and D. Gene ontology (GO) enrichment analysis revealed that several stress-related terms were more abundant in CW+, whereas morphogenesis-related processes were activated under RB+. Overall, cryopreservation had an extensive effect on gene expression, as 12,017 genes were differentially expressed in non-cryopreserved and cryopreserved shoot tips. Among all cryopreserved samples, enriched GO terms included various defense and stress responses to biotic stimuli and oxidative stress, whereas suppressed responses were mainly related to organ morphogenesis. The present study emphasizes that the optimization of light spectral properties to decrease light-related stress may greatly benefit the cryopreservation efficiency of plant germplasm.

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Gene expression in tissues of root tips from Pinus pinaster seedlings under nitrate nutrition

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