Plant dormancy in the perennial context

Rohde, Antje; Bhalerao, Rishikesh P.

doi:10.1016/j.tplants.2007.03.012

Cited by 568 publications

(490 citation statements)

References 68 publications

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“…In annual crops, such as wheat, the transition from vegetative to the reproductive phase converts all apical and axillary meristems from vegetative to inflorescence meristems (Hay and Kirby, 1991;Evers et al, 2006;Kebrom et al, 2012). In perennial plants, vegetative meristems in axillary buds do not transition to flowering before forming a vegetative shoot during the next growth cycle, which ensures a perennial growth habit (Rohde and Bhalerao, 2007). Grain sorghum is classified as weakly perennial (Dewet and Huckabay, 1967), but sorghum germplasm can exhibit a wide range of annual to perennial growth habits.…”

Section: Maintenance Of Bud Vegetative Meristems In Phyb-1 Sorghummentioning

confidence: 99%

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Kebrom

Mullet

2016

Plant Physiol.

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Phytochrome B (phyB) enables plants to modify shoot branching or tillering in response to varying light intensities and ratios of red and far-red light caused by shading and neighbor proximity. Tillering is inhibited in sorghum genotypes that lack phytochrome B (58M, phyB-1) until after floral initiation. The growth of tiller buds in the first leaf axil of wild-type (100M, PHYB) and phyB-1 sorghum genotypes is similar until 6 d after planting when buds of phyB-1 arrest growth, while wild-type buds continue growing and develop into tillers. Transcriptome analysis at this early stage of bud development identified numerous genes that were up to 50-fold differentially expressed in wild-type/phyB-1 buds. Up-regulation of terminal flower1, GA2oxidase, and TPPI could protect axillary meristems in phyB-1 from precocious floral induction and decrease bud sensitivity to sugar signals. After bud growth arrest in phyB-1, expression of dormancy-associated genes such as DRM1, GT1, AF1, and CKX1 increased and ENOD93, ACCoxidase, ARR3/6/9, CGA1, and SHY2 decreased. Continued bud outgrowth in wild-type was correlated with increased expression of genes encoding a SWEET transporter and cell wall invertases. The SWEET transporter may facilitate Suc unloading from the phloem to the apoplast where cell wall invertases generate monosaccharides for uptake and utilization to sustain bud outgrowth. Elevated expression of these genes was correlated with higher levels of cytokinin/sugar signaling in growing buds of wild-type plants.

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Section: Maintenance Of Bud Vegetative Meristems In Phyb-1 Sorghummentioning

confidence: 99%

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Kebrom

Mullet

2016

Plant Physiol.

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“…The annual alterations of growth and dormancy in forest trees from boreal and temperate regions in response to changing temperature and/or moisture regimes are well-known examples of such cyclical changes. The molecular mechanisms governing these cycles remain poorly understood (2).…”

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confidence: 99%

EARLY BUD-BREAK 1 (EBB1) is a regulator of release from seasonal dormancy in poplar trees

Yordanov

Strauss

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

131

119

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Trees from temperate latitudes transition between growth and dormancy to survive dehydration and freezing stress during winter months. We used activation tagging to isolate a dominant mutation affecting release from dormancy and identified the corresponding gene EARLY BUD-BREAK 1 (EBB1). We demonstrate through positioning of the tag, expression analysis, and retransformation experiments that EBB1 encodes a putative APETALA2/Ethylene responsive factor transcription factor. Transgenic up-regulation of the gene caused early bud-flush, whereas down-regulation delayed bud-break. Native EBB1 expression was highest in actively growing apices, undetectable during the dormancy period, but rapidly increased before bud-break. The EBB1 transcript was localized in the L1/L2 layers of the shoot meristem and leaf primordia. EBB1-overexpressing transgenic plants displayed enlarged shoot meristems, open and poorly differentiated buds, and a higher rate of cell division in the apex. Transcriptome analyses of the EBB1 transgenics identified 971 differentially expressed genes whose expression correlated with the EBB1 expression changes in the transgenic plants. Promoter analysis among the differentially expressed genes for the presence of a canonical EBB1-binding site identified 65 putative target genes, indicative of a broad regulatory context of EBB1 function. Our results suggest that EBB1 has a major and integrative role in reactivation of meristem activity after winter dormancy.adaptation | phenology | regeneration | climate change

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“…The targets and signaling intermediates of the SD pathway downstream of these early-acting components in growth cessation and dormancy remain largely unexplored (7). Although ecodormant and endodormant states can be distinguished physiologically, the molecular mechanisms underlying the establishment of endodormancy and the inability of endodormant meristems to respond to growth-promotive signals have remained elusive.…”

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confidence: 99%

Activity–dormancy transition in the cambial meristem involves stage-specific modulation of auxin response in hybrid aspen

Baba

Karlberg²,

Schmidt³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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The molecular basis of short-day-induced growth cessation and dormancy in the meristems of perennial plants (e.g., forest trees growing in temperate and high-latitude regions) is poorly understood. Using global transcript profiling, we show distinct stagespecific alterations in auxin responsiveness of the transcriptome in the stem tissues during short-day-induced growth cessation and both the transition to and establishment of dormancy in the cambial meristem of hybrid aspen trees. This stage-specific modulation of auxin signaling appears to be controlled via distinct mechanisms. Whereas the induction of growth cessation in the cambium could involve induction of repressor auxin response factors (ARFs) and down-regulation of activator ARFs, dormancy is associated with perturbation of the activity of the SKP-Cullin-F-box TIR (SCF TIR ) complex, leading to potential stabilization of repressor auxin (AUX)/indole-3-acetic acid (IAA) proteins. Although the role of hormones, such as abscisic acid (ABA) and gibberellic acid (GA), in growth cessation and dormancy is well established, our data now implicate auxin in this process. Importantly, in contrast to most developmental processes in which regulation by auxin involves changes in cellular auxin contents, day-length-regulated induction of cambial growth cessation and dormancy involves changes in auxin responses rather than auxin content.short days | meristem identity P erennial plants growing in temperate and high-latitude regions anticipate the approach of winter by sensing the associated reduction in day length (1), and when the day length becomes shorter than the critical length permitting growth [short-day signal (SD)], cell division terminates in the meristems (1). Immediately following cessation of cell division, exposure of plants to permissive conditions (e.g., long days) leads to the reversal of growth arrest (2), and this stage of growth arrest is referred to as ecodormancy. Continued exposure of ecodormant plants to short days brings about the transition from ecodormancy to endodormancy (2). The endodormant state is characterized by the inability of the meristems to respond to growth-promotive signals in contrast to the ecodormant state. Exposure to chilling temperatures is required to restore the ability of endodormant meristems to respond to growth-promotive signals and to reinitiate growth subsequently (3).Recently, the photoreceptor PHYA (4) and homologs of the flowering time genes CONSTANS and FT (5, 6) have been shown to be early-acting components in SD-induced growth cessation in trees. The targets and signaling intermediates of the SD pathway downstream of these early-acting components in growth cessation and dormancy remain largely unexplored (7). Although ecodormant and endodormant states can be distinguished physiologically, the molecular mechanisms underlying the establishment of endodormancy and the inability of endodormant meristems to respond to growth-promotive signals have remained elusive.We investigated whether the SD-regulated induction o...

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Plant dormancy in the perennial context

Cited by 568 publications

References 68 publications

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

Transcriptome Profiling of Tiller Buds Provides New Insights into PhyB Regulation of Tillering and Indeterminate Growth in Sorghum

EARLY BUD-BREAK 1 (EBB1) is a regulator of release from seasonal dormancy in poplar trees

Activity–dormancy transition in the cambial meristem involves stage-specific modulation of auxin response in hybrid aspen

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