Axillary buds are dwarfed shoots that tightly regulate GA pathway and GA-inducible 1,3-β-glucanase genes during branching in hybrid aspen

Rinne, Päivi L.H.; Paul, Laju K.; Vahala, Jorma; Kangasjärvi, Jaakko; Schoot, Christiaan van der

doi:10.1093/jxb/erw352

Cited by 50 publications

(44 citation statements)

References 104 publications

(192 reference statements)

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“…In O. sativa, GH17 is the largest GH family [17]. In A. thaliana and Populus trichocarpa, it comprises 50 and 100 members, respectively [54]. The GH3 family includes β-1,3-glucanase (glucan endo-1,3-β-D-glucosidase, E.C 3.2.1.39), glucan 1,3-β-glucosidase (E.C 3.2.1.58), licheninase (EC 3.2.1.73), glucan 1,4-β-glucosidase (EC 3.2.1.74) activities (enzyme.expasy.org/).…”

Section: Gh 17mentioning

confidence: 99%

Glycoside Hydrolases in Plant Cell Wall Proteomes: Predicting Functions That Could Be Relevant for Improving Biomass Transformation Processes

Calderan-Rodrigues¹,

Fonseca²,

Clemente³

et al. 2018

Advances in Biofuels and Bioenergy

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Glycoside hydrolases (GHs) are enzymes that are able to rearrange the plant cell wall polysaccharides, being developmental-and stress-regulated. Such proteins are used in enzymatic cocktails for biomass hydrolysis in the second-generation ethanol (E2G) production. In this chapter, we investigate GHs identified in plant cell wall proteomes by predicting their functions through alignment with homologous plant and microorganism sequences and identification of functional domains. Up to now, 49 cell wall GHs were identified in sugarcane and 114 in Brachypodium distachyon. We could point at candidate proteins that could be targeted to lower biomass recalcitrance. We more specifically addressed several GHs with predicted cellulase, hemicellulase, and pectinase activities, such as β-xylosidase, α and β-galactosidase, α-N-arabinofuranosidases, and glucan β-glucosidases. These enzymes are among the most used in enzymatic cocktails to deconstruct plant cell walls. As an example, the fungi arabinofuranosidases belonging to the GH51 family, which were also identified in sugarcane and B. distachyon, have already been associated to the degradation of hemicellulosic and pectic polysaccharides, through a peculiar mechanism, probably more efficient than other GH families. Future research will benefit from the information available here to design plant varieties with self-disassembly capacity, making the E2G more cost-effective through the use of more efficient enzymes.

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Section: Gh 17mentioning

confidence: 99%

Glycoside Hydrolases in Plant Cell Wall Proteomes: Predicting Functions That Could Be Relevant for Improving Biomass Transformation Processes

Calderan-Rodrigues¹,

Fonseca²,

Clemente³

et al. 2018

Advances in Biofuels and Bioenergy

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“…In that regard, some xylem‐specific components of the wall biosynthesis/remodeling machinery are regulated by the SL pathway. For example, in hybrid aspen, a SL‐dependent up‐regulation of 1,3‐β‐glucanases (GH17 family, α‐clade) controls shoot elongation via callose hydrolysis at sieve plates and plasmodesmata (Rinne, Paul, Vahala, Kangasjärvi, & van der Schoot, ). In addition, SL have been suggested as positive regulators of cambium activity in Arabidopsis , pea and in the woody plant Eucalyptus globulus .…”

Section: Discussionmentioning

confidence: 99%

Growth‐ and stress‐related defects associated with wall hypoacetylation are strigolactone‐dependent

et al. 2018

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Mutants affected in the Arabidopsis TBL 29/ ESK 1 xylan O‐acetyltransferase display a strong reduction in total wall O ‐acetylation accompanied by a dwarfed plant stature, collapsed xylem morphology, and enhanced freezing tolerance. A newly identified tbl29/esk1 suppressor mutation reduces the expression of the MAX 4 gene, affecting the biosynthesis of methyl carlactonoate (Me CLA ), an active strigolactone ( SL ). Genetic and biochemical evidence suggests that blocking the biosynthesis of this SL is sufficient to recover all developmental and stress‐related defects associated with the TBL 29/ ESK 1 loss of function without affecting its direct effect—reduced wall O ‐acetylation. Altered levels of the MAX 4 SL biosynthetic gene, reduced branch number, and higher levels of Me CLA , were also found in tbl29/esk1 plants consistent with a constitutive activation of the SL pathway. These results suggest that the reduction in O ‐acetyl substituents in xylan is not directly responsible for the observed tbl29/esk1 phenotypes. Alternatively, plants may perceive defects in the structure of wall polymers and/or wall architecture activating the SL hormonal pathway as a compensatory mechanism.

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“…For example, it has been reported that in perennial trees the release of bud dormancy requires the removal of callose in the plamodesmata in order to restore the symplastic connectivity in the meristem (Rinne et al 2011;Rinne et al 2001;Rinne et al 2016). Although we saw there is a vascular connection between the buds and the mother bulb, it is plausible to think that it might not be very functional when callose is not entirely removed from plasmodesmata in dormant buds, and therefore less carbon resources can be remobilized into those buds.…”

Section: Dormancy and Sink Strength In Tulip Axillary Budsmentioning

confidence: 99%

“…Apical dominance is the control of the apex of the plant over the outgrowth of the axillary buds (Cline 1994). Axillary buds repressed by apical dominance are also called para-dormant and they resume growth upon decapitation of the apex (Rinne et al 2016). Evidence from apical dominance studies indicates that the auxin produced in the apex of the plant (Cline 1996;Cline 2000;Cline et al 2001;Domagalska and Leyser 2011) and the high sugar demand of the apex (Mason et al 2014;Barbier et al 2015) and hence, a kind of starvation of the axillary buds, are the initial inhibitory effectors in axillary bud outgrowth.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of vegetative propagation in bulbs : a molecular approach

Moreno-Pachon

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Axillary buds are dwarfed shoots that tightly regulate GA pathway and GA-inducible 1,3-β-glucanase genes during branching in hybrid aspen

Abstract: HighlightAxillary buds uniquely regulate gibberellin (GA) pathway genes, enabling them to stay inhibited but simultaneously poised for growth. Decapitation promotes expression of GA-inducible 1,3-β-glucanase genes that function to reinvigorate symplasmic connections to the stem.

Cited by 50 publications

References 104 publications

Glycoside Hydrolases in Plant Cell Wall Proteomes: Predicting Functions That Could Be Relevant for Improving Biomass Transformation Processes

Glycoside Hydrolases in Plant Cell Wall Proteomes: Predicting Functions That Could Be Relevant for Improving Biomass Transformation Processes

Growth‐ and stress‐related defects associated with wall hypoacetylation are strigolactone‐dependent

Mechanisms of vegetative propagation in bulbs : a molecular approach

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