Suppression of sorghum axillary bud outgrowth by shade, phyB and defoliation signalling pathways

Kebrom, Tesfamichael H.; Brutnell, Thomas P.; Finlayson, Scott A.

doi:10.1111/j.1365-3040.2009.02050.x

Cited by 104 publications

(145 citation statements)

References 96 publications

(203 reference statements)

Supporting

Mentioning

134

Contrasting

Unclassified

Order By: Relevance

“…Studies on bud dormancy induced by apically derived auxin in pea and dormancy induced by shade signals and defoliation in sorghum have documented downregulation of cell division-related genes in dormant buds (Devitt and Stafstrom, 1995;Kebrom et al, 2010). However, results from other systems indicated that not all types of dormancy are associated with downregulation of the expression of cell cycle-related genes (Espinosa-Ruiz et al, 2004;Kebrom et al, 2010).…”

Section: Expression Of Cell Cycle-related Genes In Dormant Buds Of Tinmentioning

confidence: 86%

“…However, results from other systems indicated that not all types of dormancy are associated with downregulation of the expression of cell cycle-related genes (Espinosa-Ruiz et al, 2004;Kebrom et al, 2010). Hence, the induction of different types or degrees of bud dormancy may involve distinct molecular mechanisms depending on the dormancy-inducing factors.…”

Section: Expression Of Cell Cycle-related Genes In Dormant Buds Of Tinmentioning

confidence: 99%

“…The dormancy versus outgrowth fates of a bud are determined by combined environmental and endogenous signals, and the integration of these signals within the bud is the subject of current research (AguilarMartínez et al, 2007;Kebrom et al, 2010). TB1 and TB1-like genes are important tillering genes that function within the bud, which could be a point of integration for some of the branching-regulating signals.…”

Section: Murraymentioning

confidence: 99%

“…The expression level was calculated using a slightly modified 2 -(DDCt) method, where DDCt was the threshold cycle (Ct) of the target gene minus the Ct of rRNA of a sample, minus the average of the Ct of the target gene, minus the Ct of rRNA of all samples in each biological replicate. Instead of using one of the samples as a reference, the average of the Ct of the target gene minus the Ct of rRNA of all samples in each biological replicate, which is the mean normalized value, was used as a reference (as described in Kebrom et al, 2010). Quantitative PCR results are from three biological replicates, each with two technical replicates.…”

Section: Quantitative Pcr Of Wheat Genesmentioning

confidence: 99%

See 3 more Smart Citations

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

Self Cite

View full text Add to dashboard Cite

Tillering (branching) is a major yield component and, therefore, a target for improving the yield of crops. However, tillering is regulated by complex interactions of endogenous and environmental signals, and the knowledge required to achieve optimal tiller number through genetic and agronomic means is still lacking. Regulatory mechanisms may be revealed through physiological and molecular characterization of naturally occurring and induced tillering mutants in the major crops. Here we characterize a reduced tillering (tin, for tiller inhibition) mutant of wheat (Triticum aestivum). The reduced tillering in tin is due to early cessation of tiller bud outgrowth during the transition of the shoot apex from the vegetative to the reproductive stage. There was no observed difference in the development of the main stem shoot apex between tin and the wild type. However, tin initiated internode development earlier and, unlike the wild type, the basal internodes in tin were solid rather than hollow. We hypothesize that tin represents a novel type of reduced tillering mutant associated with precocious internode elongation that diverts sucrose (Suc) away from developing tillers. Consistent with this hypothesis, we have observed upregulation of a gene induced by Suc starvation, downregulation of a Suc-inducible gene, and a reduced Suc content in dormant tin buds. The increased expression of the wheat Dormancy-associated (DRM1-like) and Teosinte Branched1 (TB1-like) genes and the reduced expression of cell cycle genes also indicate bud dormancy in tin. These results highlight the significance of Suc in shoot branching and the possibility of optimizing tillering by manipulating the timing of internode elongation.

show abstract

Section: Expression Of Cell Cycle-related Genes In Dormant Buds Of Tinmentioning

confidence: 86%

Section: Expression Of Cell Cycle-related Genes In Dormant Buds Of Tinmentioning

confidence: 99%

Section: Murraymentioning

confidence: 99%

Section: Quantitative Pcr Of Wheat Genesmentioning

confidence: 99%

See 2 more Smart Citations

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…2A) Kebrom et al, 2006Kebrom et al, , 2010. After 6 DAP, the buds in phyB-1 plants show no or very slow growth, whereas buds of wild-type plants continue to steadily increase in size ( Fig.…”

Section: Resultsmentioning

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Forbidden Fruit: Dominance Relationships and the Control of Shoot Architecture

Walker

Bennett

2018

Annual Plant Reviews Online

View full text Add to dashboard Cite

Plants continually integrate environmental information to make decisions about their development. Correlative controls, in which one part of the plant regulates the growth of another, form an important class of regulatory mechanism, but their study has been neglected and their molecular basis remains unclear. In this review, we examine the role of negative correlative controls or 'dominance' phenomena in the regulation of shoot architecture. Apical dominance, in which actively growing shoot branches inhibit the growth of other branches, is perhaps the most famous example of this. We discuss the recent progress made in understanding the mechanistic basis for apical dominance, and three plausible models for shoot branching control. We then use the apical dominance paradigm to explore other dominance phenomena, including seed-seed inhibition (carpic dominance), seed-tomeristem inhibition, and the control of maternal senescence by seeds. We propose that apical and carpic dominance may share a common mechanistic basis rooted in auxin transport canalization. Conversely, we conclude that seed-to-meristem inhibition and seed-driven senescence may not be 'true' correlative controls, but rather more complex phenomena in which seed-set plays a permissive rather than instructive role. Overall, we attempt to develop a coherent framework for understanding the developmental and regulatory mechanisms that control shoot architecture, and provide new insights into the end of flowering, fruiting and growth.

show abstract

Suppression of sorghum axillary bud outgrowth by shade, phyB and defoliation signalling pathways

Cited by 104 publications

References 96 publications

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

Inhibition of Tiller Bud Outgrowth in thetinMutant of Wheat Is Associated with Precocious Internode Development

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

Forbidden Fruit: Dominance Relationships and the Control of Shoot Architecture

Contact Info

Product

Resources

About