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Response of ‘Clausellina’ Satsuma mandarin to 3,5,6-trichloro-2-pirydiloxyacetic acid and fruitlet abscission

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Abstract

The application of the synthetic auxin 3,5,6-trichloro-2-piridyloxyacetic acid (3,5,6-TPA) isopropyl ester at the onset of cell enlargement stage, significantly thinned fruitlets in ‘Clausellina’ Satsuma mandarin. The magnitude of the response was related to the concentration applied, increasing the percentage of abscised fruit with higher concentrations, which was up to 70% at 25 mg l−1. The magnitude of the response also depended on the organ subject to treatment, abscission being greater when applied to the leaves rather than to fruit. Results suggest that a photosynthetic disorder was responsible for a reduction in fruit growth rate, triggering abscission mechanisms producing ethylene and abscission.

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Authors and Affiliations

  1. Instituto Agroforestal Mediterráneo, Universidad Politécnica, Camino de Vera, s/n, Valencia, 46022, Spain

    Manuel Agustí, Mariano Juan & Vicente Almela

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  1. Manuel Agustí
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  2. Mariano Juan
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  3. Vicente Almela
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Correspondence to Manuel Agustí.

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Agustí, M., Juan, M. & Almela, V. Response of ‘Clausellina’ Satsuma mandarin to 3,5,6-trichloro-2-pirydiloxyacetic acid and fruitlet abscission. Plant Growth Regul 53, 129–135 (2007). https://doi.org/10.1007/s10725-007-9210-2

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  • DOI: https://doi.org/10.1007/s10725-007-9210-2

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