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Fig. 7 | Molecular Horticulture

Fig. 7

From: Increased branching independent of strigolactone in cytokinin oxidase 2-overexpressing tomato is mediated by reduced auxin transport

Fig. 7

Working model for the role of CKX2 in tomato shoot branching. The inhibition of polar auxin transport (PAT) in the stem by the overexpression of CKX2 (CKX2-OE) could release bud outgrowth mediated (1) or not (2) by auxin export in the bud. It is well known that PAT competitively inhibits auxin export from the axillary buds, which is a prerequisite for bud outgrowth (Barbier et al., 2018). Strigolactone (SL) also inhibits auxin export, which can be reverted in CCD7-AS plants. The additive phenotype of the double transgenic CKX2-OE, CCD7-AS plants (see Fig. 4) could be the consequence of the magnification of the convergent realease of auxin export (1) or due to another unknown mechanism (2) where CKX2-OE and CCD7-AS plants act in parallel pathways controlling bud outgrowth

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Molecular Horticulture

ISSN: 2730-9401

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