Growth coordination and the shoot epidermis

Savaldi-Goldstein, Sigal; Chory, Joanne

doi:10.1016/j.pbi.2007.10.009

Cited by 80 publications

(72 citation statements)

References 45 publications

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“…Both auxin and brassinosteroid action in the SAM is localized in the L1 layer (38), where we find the highest expression of EBB1. The putative positive interaction of EBB1 with auxin and brassinosteroid signaling is also supported by our microarray analysis.…”

Section: Discussionmentioning

confidence: 56%

“…L1/L2, particularly L1, from which epidermis is derived, may promote and restrict growth of the entire leaf/shoot by spreading growth-promoting signals to the inner layers (38). The enrichment of genes that encode epidermal cell fate specification and leaf shape in EBB1 transgenics supports this putative function.…”

Section: Discussionmentioning

confidence: 81%

“…The enrichment of genes that encode epidermal cell fate specification and leaf shape in EBB1 transgenics supports this putative function. Furthermore, because L1 interfaces most closely with the ambient environment, it may have a unique role in perception of environmental cues (38), particularly changes in temperature that typically are the sole drivers of bud-break. Consistent with this hypothesis, our microarray analysis indicates significant enrichment in EBB1 transgenics of GO categories associated with perception of various environmental cues, including temperature (discussed below).…”

Section: Discussionmentioning

confidence: 99%

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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.

139

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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Section: Discussionmentioning

confidence: 56%

Section: Discussionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

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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.

139

119

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“…Generating vascular embolism as could be because extinction gradient in leaf Ψ w [18]. The central idea developed in this paper is that water potential gradient is generated not only by force of suction sweating and increase activity extinction and increasing cell volume.…”

Section: General Remarksmentioning

confidence: 99%

Plants, Functions and Processes Adapt to Different Environments

Butnariu¹

2015

J Bioequiv Availab

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Executive SummaryBio processes that provide interactive relationships between plant organs are associated with self-regulation functions and maintaining a dynamic balance. The adaptation process is achieved indissoluble unity of the plant with the environment. Water connects all parts of the plant beginning with molecules and ending with tissues and organs, in one whole; appears to be the only substance in the plant, which suitably may perform the functions of regulating the growth, metabolic activity and controlling integration structure and functions at all levels of the organization. The main cause of impaired functional integrity during drought conditions is disruption of the internal liquid medium, donor-acceptor relations and change water gradients between organs, inhibition of metabolic reactions and biosynthesis. In drought conditions water has central role in coordinating and maintaining the integrity functions. General RemarksDrought, water shortage in soil and /or atmospheric temperature and high irradiation is most alarming factor limiting crop productivity and stability throughout world. Plants are affected when drought overlaps fund environmental pollution by harmful substances, salinity or cold weather. Study of functioning of adjustment of metabolic processes, plant growth and development under adverse conditions is a cardinal point in knowledge of plants to drought tolerance mechanisms that could serve as a basis for developing routing processes directed to functional status and optimization of production process. Problem assessment and adaptation mechanisms that provide plant resistance to adverse conditions and is considered a perpetual maximum value for both contemporary biological science and future of humanity.Researches reveal peculiarities explaining adaptation and drought resistance in plants of spontaneous basis. Characteristics relate to the development and shape of the plant, the number and depth of penetration of root system, xylem and phloem properties [1]; use and storage of assimilate reserves. There are great progress in understanding of perception and signalling mechanisms of water scarcity and genes involved in plant response to drought. Investigations carried out are focused on study of mechanisms of resistance, which is achieved at molecular and cellular levels, while elucidating principles of regulating at the level of plant resistance remains less addressed. It highlights several strategies to adapt to adverse conditions: one occurs at the cellular level and includes accommodation macromolecules and micro environment in which they operate, other-level plant, and reflects integrity of the inferior hierarchical components. As reported above, most of investigations are focused on highlighting deployment of first mechanisms of adaptation strategies and tolerance, while second remains the least addressed [2]. But an environmental change plant perceives the plant upright and resistant to stressogenic factors were studied is due to the retention of functional integrity of all orga...

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“…The cytokinin-related gene At3g55950 is specifically up-regulated in the epidermis of both top and base stem, similar to the cytokinin-regulated kinase 1 gene (Nicotiana tabacum) AAG25966. Cell growth mainly due to expansion can be controlled by a signal (s) initiated from the epidermis, and the epidermis could be a barrier to inner tissue growth; growth activity is coordinated between the shoot epidermis and the inner part [58]. These genes are possibly related to growth regulation.…”

Section: Expression Analysis Of Distribution Of Genesmentioning

confidence: 99%

Comparative gene expression analysis in stems of <i>Dolichos purpureus</i> and <i>Arabidopsis thaliana</i>

Yan¹,

Wang²,

Chu³

et al. 2012

AJMB

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The outermost layer epidermis of a plant stem plays an important role in protection and environmentsensing. The mechanisms of sensing and response to the environment through the stem epidermis remain unclear. Here we report enriched expression of genes involved in stress resistance and signal transduction functions in the stem epidermis of both D. purpureus and A. thaliana by cDNA cloning and QPCR in D. purpureus and by analysis using dataset from a genome-wide comparison with cDNAs differentially expressed between the epidermis and inner parts of top and base stem in A. thaliana. Among 188 cDNAs from the stem epidermis of D. purpureus, 13% and 17% were related to signal transduction and defense respectively. Most of them were up-regulated more in the stem epidermis than the inner stem, as well as in A. thaliana. Also, the distribution of the numbers and specificities of up-regulated genes related to signal transduction and regulatory networks in the epidermis and inner stem revealed the possibility of positional differences in regulation. The results revealed the importance of the epidermis in signal transduction and plant defence.

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Growth coordination and the shoot epidermis

Cited by 80 publications

References 45 publications

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

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

Plants, Functions and Processes Adapt to Different Environments

Comparative gene expression analysis in stems of <i>Dolichos purpureus</i> and <i>Arabidopsis thaliana</i>

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Growth coordination and the shoot epidermis

Cited by 80 publications

References 45 publications

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

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

Plants, Functions and Processes Adapt to Different Environments

Comparative gene expression analysis in stems of &lt;i&gt;Dolichos purpureus&lt;/i&gt; and &lt;i&gt;Arabidopsis thaliana&lt;/i&gt;

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Comparative gene expression analysis in stems of <i>Dolichos purpureus</i> and <i>Arabidopsis thaliana</i>