Strigolactone may interact with gibberellin to control apical dominance in pea (Pisum sativum)

Luisi, Alessandro; Lorenzi, Roberto; Sorce, Carlo

doi:10.1007/s10725-011-9603-0

Cited by 18 publications

(11 citation statements)

References 21 publications

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“…S2 ). It is possible that in those species, gibberellin may play a role as a negative factor in controlling lateral bud outgrowth as reported in pea ( Scott et al 1967 , Luisi et al 2011 ), Arabidopsis ( Silverstone et al 1997 ) and Populus ( Mauriat et al 2011 , Zawaski and Busov 2014 ). Collectively, our results suggest that compared with the model plants Arabidopsis and pea, a more complex network regulates shoot branching in many perennial trees, in which gibberellin plays an important positive role.…”

Section: Discussionmentioning

confidence: 92%

“…Although a negative correlation between gibberellin levels and branching or tillering has been observed in some species, such as Arabidopsis ( Silverstone et al 1997 ), pea ( Scott et al 1967 , Luisi et al 2011 ), rice ( Lo et al 2008 , Qi et al 2011 ), barley ( Jia et al 2009 , Jia et al 2011 ), turfgrass ( Agharkar et al 2007 ) and Populus trees ( Mauriat et al 2011 , Zawaski and Busov 2014 ), we found that gibberellin acts as a positive regulator in the regulation of shoot branching in the perennial woody plant J. curcas , demonstrated by direct GA 3 treatment ( Fig. 1 ) and by overexpressing the gibberellin biosynthesis gene JcGA20ox1 ( Supplementary Fig.…”

Section: Discussionmentioning

confidence: 99%

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Gibberellin Promotes Shoot Branching in the Perennial Woody PlantJatropha curcas

Chen

et al. 2015

Plant Cell Physiol

122

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Strigolactone (SL), auxin and cytokinin (CK) interact to regulate shoot branching. CK has long been considered to be the only key phytohormone to promote lateral bud outgrowth. Here we report that gibberellin also acts as a positive regulator in the control of shoot branching in the woody plant Jatropha curcas. We show that gibberellin and CK synergistically promote lateral bud outgrowth, and that both hormones influence the expression of putative branching regulators, J. curcas BRANCHED1 and BRANCHED2, which are key transcription factors maintaining bud dormancy. Moreover, treatment with paclobutrazol, an inhibitor of de novo gibberellin biosynthesis, significantly reduced the promotion of bud outgrowth by CK, suggesting that gibberellin is required for CK-mediated axillary bud outgrowth. In addition, SL, a plant hormone involved in the repression of shoot branching, acted antagonistically to both gibberellin and CK in the control of lateral bud outgrowth. Consistent with this, the expression of JcMAX2, a J. curcas homolog of Arabidopsis MORE AXILLARY GROWTH 2 encoding an F-box protein in the SL signaling pathway, was repressed by gibberellin and CK treatment. We also provide physiological evidence that gibberellin also induces shoot branching in many other trees, such as papaya, indicating that a more complicated regulatory network occurs in the control of shoot branching in some perennial woody plants.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Gibberellin Promotes Shoot Branching in the Perennial Woody PlantJatropha curcas

Chen

et al. 2015

Plant Cell Physiol

122

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“…There are also two reports on a negative correlation between bioactive GA 1 levels and branching, as seen in Citrus and Chrysanthemum transgenic plants (Fagoaga et al, 2007;Miao et al, 2010). Interestingly, it has been proposed recently that GAs could change bud sensitivity to application of synthetic SLs (Luisi et al, 2011), as seen in dwarf pea plants with low GA 1 . Our results also suggest an interaction between SL levels and bud sensitivity to GA 3 .…”

Section: Sls Affect Ga 3 -Induced Sprout Releasementioning

confidence: 99%

The role of the potato (Solanum tuberosum) CCD8 gene in stolon and tuber development

et al. 2013

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SummaryStrigolactones (SLs) are a class of phytohormones controlling shoot branching. In potato (Solanum tuberosum), tubers develop from underground stolons, diageotropic stems which originate from basal stem nodes. As the degree of stolon branching influences the number and size distribution of tubers, it was considered timely to investigate the effects of SL production on potato development and tuber life cycle.Transgenic potato plants were generated in which the CAROTENOID CLEAVAGE DIOXYGENASE8 (CCD8) gene, key in the SL biosynthetic pathway, was silenced by RNA interference (RNAi).The resulting CCD8-RNAi potato plants showed significantly more lateral and main branches than control plants, reduced stolon formation, together with a dwarfing phenotype and a lack of flowering in the most severely affected lines. New tubers were formed from sessile buds of the mother tubers. The apical buds of newly formed transgenic tubers grew out as shoots when exposed to light. In addition, we found that CCD8 transcript levels were rapidly downregulated in tuber buds by the application of sprout-inducing treatments.These results suggest that SLs could have an effect, solely or in combination with other phytohormones, in the morphology of potato plants and also in controlling stolon development and maintaining tuber dormancy.

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“…Another group of hormones that are involved in the regulation of shoot architecture and act antagonistically toward SL are cytokinins that promote cell divisions and the outgrowth of axillary buds (Dun et al ). Moreover, not only a correlation between SL and GAs during the outgrowth of axillary buds in pea was reported (Luisi et al ), but also the independent action of SL and GA during the elongation of internodes was postulated (de Saint Germain et al ).…”

Section: Introductionmentioning

confidence: 99%

Identification and functional analysis of the HvD14 gene involved in strigolactone signaling in Hordeum vulgare

Marzec

Gruszka

Tylec

et al. 2016

Physiologia Plantarum

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In this study, the barley HvD14 gene encoding α/β hydrolase, which is involved in strigolactone (SL) signaling, was identified. Bioinformatics analysis revealed that the identified gene is an orthologue of the D14, AtD14 and PhDAD2 genes that have been described in rice, Arabidopsis thaliana and petunia, respectively. Using TILLING strategy, an hvd14.d mutant that carried the G725A transition, located in the second exon, was identified. This mutation led to the substitution of a highly conserved glycine-193 to glutamic acid in the conserved fragment of the α/β hydrolase domain of the HvD14 protein. The plants that carry the hvd14.d allele were semi-dwarf and produced a higher number of tillers in comparison to the wild-type (WT) parent cultivar. Additionally, the root architecture of mutant plants was affected: the total length of the seminal roots was significantly reduced, and the density of the lateral roots was higher than in the WT. Plants with the hvd14.d allele were insensitive to treatment with GR24, which is the synthetic analogue of SL. Analysis of the indole-3-acetic acid (IAA) concentration in the lateral buds showed no differences between the WT and mutant plants. By contrast, the WT seedlings treated with GR24 developed a lower number of tillers, longer primary roots with a reduced number of lateral roots and had an increased concentration of IAA in lateral buds. This paper describes the first barley SL mutant and shows the potential functions of SLs in barley growth and development.

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Strigolactone may interact with gibberellin to control apical dominance in pea (Pisum sativum)

Cited by 18 publications

References 21 publications

Gibberellin Promotes Shoot Branching in the Perennial Woody PlantJatropha curcas

Gibberellin Promotes Shoot Branching in the Perennial Woody PlantJatropha curcas

The role of the potato (Solanum tuberosum) CCD8 gene in stolon and tuber development

Identification and functional analysis of the HvD14 gene involved in strigolactone signaling in Hordeum vulgare

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