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Fruit load restricts the flowering promotion effect of paclobutrazol in alternate bearing Citrus spp.

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URI
http://hdl.handle.net/20.500.11939/5604
DOI
10.1016/j.scienta.2012.12.014
Derechos de acceso
openAccess
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Author
Martínez-Fuentes, Amparo; Mesejo, Carlos; Munoz-Fambuena, Natalia; Reig, Carmina; González-Mas, María C.; Iglesias, Domingo J.; Primo-Millo, Eduardo; Agustí, Manuel
Date
2013
Cita bibliográfica
Martinez-Fuentes, A., Mesejo, C., Munoz-Fambuena, N., Reig, C., Gonzalez-Mas, M.C., Iglesias, D. J., Primo-Millo, E., Agusti, M. (2013). Fruit load restricts the flowering promotion effect of paclobutrazol in alternate bearing Citrus spp.. Scientia Horticulturae, 151, 122-127.
Abstract
The floral bud inductive period, PBZ promotes flowering in Citrus; however, our results indicate that this effect is fruit-load dependant. In ‘Salustiana’ and ‘Navelina’ sweet oranges, ‘Hernandina’ Clementine mandarin, and ‘Afourer’ and ‘Moncada’ hybrids, flowering intensity significantly increased the following spring for medium-to-low fruit-load trees treated with either 1–10 g PBZ tree−1 applied to the soil or 15 g tree−1 sprayed on the canopy. PBZ significantly increased the percentage of sprouted buds and leafless floral shoots (both single-flowered shoots and inflorescences) and reduced the number of vegetative shoots. By contrast, heavy fruit load trees receiving the same amount of PBZ in the same season or at floral bud differentiation period scarcely flowered. Fruit nullified the effect of PBZ irrespective to treatment date (inductive period or bud burst) as well as the dose applied (1, 10 or 15 g tree−1) or the treatment method (soil application or canopy spraying). In conclusion, the effectiveness of PBZ in promoting flowering in Citrus depends on the fruit load since the tree showed a cultivar-dependant threshold value above which PBZ is unable to promote flowering.
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