| Autor: |
José Le Gourrierec, Franziska Fichtner, Christine A. Beveridge, François Barbier, Christoph Weiste, Da Cao, Mathieu Caradeuc, Maria-Dolores Perez-Garcia, Soulaiman Sakr |
| Rok vydání: |
2020 |
| Předmět: |
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| Popis: |
Plant architecture is controlled by several endogenous signals including hormones and sugars. However, only little is known about the nature and roles of the sugar signalling pathways in this process. Here we test whether the sugar pathway mediated by HEXOKINASE1 (HXK1) is involved in the control of shoot branching.-To test the involvement of HXK1 in the control of shoot architecture we modulated the HXK1 pathway using physiological and genetic approaches in diverse plants, rose, arabidopsis and pea and evaluated impacts of hormonal pathways.-We show that triggering a hexokinase-dependent pathway was able to promote bud outgrowth in pea and rose. In arabidopsis, both HXK1 deficiency and defoliation led to decreased shoot branching and conferred hypersensitivity to auxin.HXK1expression was positively correlated with sugar availability. HXK1-deficient plants displayed decreased cytokinin levels and increased expression ofMAX2which is required for strigolactone signalling. The branching phenotype of HXK1-deficient plants could be partly restored by cytokinin treatment and strigolactone deficiency could override the negative impact ofHXK1deficiency on shoot branching.-Our observations demonstrate that a HXK1-dependent pathway contributes to the regulation of shoot branching and interact with hormones to modulate plant architecture. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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