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RNAseq analysis of Arabis alpina buds in the dormant zone (V2) and buds in the growing zone (V3) at the end of vernalization (+0) and 5 days later (+5d)

ABSTRACT: Arabis alpina, similar to woody perennials, has a complex architecture with a zone of axillary vegetative branches and a zone of dormant buds that serve as perennating organs. We show that floral development during vernalization is the key for shaping the dormant bud zone by facilitating a synchronized and rapid growth after vernalization and thereby causing an increase in auxin transport, response and endogenous indole-3-acetic acid (IAA) levels in the stem. Floral development during vernalization is associated with the development of axillary buds in subapical nodes. Our transcriptome analysis indicated that these buds are not dormant during vernalization but only reach sustained growth after the return to warm temperatures. Floral and subapical vegetative branches grow after vernalization and inhibit the development of the buds below. Dormancy in these buds is regulated across the A. alpina life cycle by low temperatures and by apical dominance in a BRANCHED 1 dependent mechanism.

ORGANISM(S): Arabis alpina

PROVIDER: GSE126944 | GEO | 2020/03/01

REPOSITORIES: GEO

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Keep a distance to be different: axillary bud initiating at a distance to the shoot apical meristem are crucial for the perennial life style of Arabis alpina

Project description:Purpose: In higher plants, perennialism is achieved through axillary buds and side-shoots that stay vegetative. This work aims to analyze the pattern of axillary bud (AB) formation in the perennial model plant Arabis alpina and to study the role of LATERAL SUPPRESSOR (AaLAS) gene in this process. Methods: This study combines stereomicroscopic analysis with RNA sequencing to monitor how patterns of AB formation and gene expression correlate. The role of AaLAS was studied using an RNAi approach. Results: During vegetative development, ABs initiate at a distance to the SAM, whereas after induction of flowering ABs initiate adjacent to the SAM. Dormant buds are established before onset of vernalization. Transcript profiles of ABs initiated at a distance were different from that of the SAM, whereas transcript patterns of buds initiated in close proximity were similar to the corresponding SAM. Knock-down of AaLAS leads to loss of both dormant buds and vegetative side-shoots, strongly compromising perennial life style. Conclusions: AB formation is regulated differently during vegetative and reproductive development. New meristems that show gene expression profiles different from the SAM are established at a distance to the SAM. AaLAS plays an essential role in perennial life cycle modulating the establishment of dormant buds and vegetative side-shoots.

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RNAseq analysis of Arabis alpina buds in the dormant zone (V2) and buds in the growing zone (V3) at the end of vernalization (+0) and 5 days later (+5d)

Project description:RNAseq analysis of Arabis alpina buds in the dormant zone (V2) and buds in the growing zone (V3) at the end of vernalization (+0) and 5 days later (+5d)

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