Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus
The hormonal signals controlling fruitlet abscission induced by sugar shortage in citrus were identified in Satsuma mandarin, Citrus unshiu (Mak.) Marc, cv. Clausellina and cv. Okitsu. Sugar supply, hormonal responses and fruitlet abscission were manipulated through full, partial or selective leaf r...
| Autores principales: | , , , , |
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| Formato: | Artículo |
| Lenguaje: | Inglés |
| Publicado: |
2017
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| Acceso en línea: | http://hdl.handle.net/20.500.11939/5295 |
| _version_ | 1855491901167239168 |
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| author | Gómez-Cadenas, Aurelio Mehouachi, J. Tadeo, Francisco R. Primo-Millo, Eduardo Talón, Manuel |
| author_browse | Gómez-Cadenas, Aurelio Mehouachi, J. Primo-Millo, Eduardo Tadeo, Francisco R. Talón, Manuel |
| author_facet | Gómez-Cadenas, Aurelio Mehouachi, J. Tadeo, Francisco R. Primo-Millo, Eduardo Talón, Manuel |
| author_sort | Gómez-Cadenas, Aurelio |
| collection | ReDivia |
| description | The hormonal signals controlling fruitlet abscission induced by sugar shortage in citrus were identified in Satsuma mandarin, Citrus unshiu (Mak.) Marc, cv. Clausellina and cv. Okitsu. Sugar supply, hormonal responses and fruitlet abscission were manipulated through full, partial or selective leaf removals at anthesis and thereafter. In developing fruitlets, defoliations reduced soluble sugars (up to 98%), but did not induce nitrogen and water deficiencies. Defoliation-induced abscission was preceded by rises (up to 20-fold) in the levels of abscisic acid (ABA) and 1-aminocyclopropane-1-carboxylic acid (ACC) in fruitlets. Applications to defoliated plants showed that ABA increased ACC levels (2-fold) and accelerated fruitlet abscission, whereas norflurazon and 2-aminoethoxyvinyl glycine reduced ACC (up to 65%) and fruitlet abscission (up to 40%). Only the fun defoliation treatment reduced endogenous gibberellin Al (4-fold), whereas exogenous gibberellins had no effect on abscission. The data indicate that fruitlet abscission induced by carbon shortage in citrus is regulated by ABA and ACC originating in the fruits, while gibberellins are apparently implicated in the maintenance of growth. In this system, ABA may act as a sensor of the intensity of the nutrient shortage that modulates the levels of ACC and ethylene, the activator of abscission. This proposal identifies ABA and ACC as components of the self-regulatory mechanism that adjusts fruit load to carbon supply, and offers a physiological basis for the photoassimilate competition-induced abscission occurring under natural conditions. |
| format | Artículo |
| id | ReDivia5295 |
| institution | Instituto Valenciano de Investigaciones Agrarias (IVIA) |
| language | Inglés |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| record_format | dspace |
| spelling | ReDivia52952025-04-25T14:41:56Z Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus Gómez-Cadenas, Aurelio Mehouachi, J. Tadeo, Francisco R. Primo-Millo, Eduardo Talón, Manuel The hormonal signals controlling fruitlet abscission induced by sugar shortage in citrus were identified in Satsuma mandarin, Citrus unshiu (Mak.) Marc, cv. Clausellina and cv. Okitsu. Sugar supply, hormonal responses and fruitlet abscission were manipulated through full, partial or selective leaf removals at anthesis and thereafter. In developing fruitlets, defoliations reduced soluble sugars (up to 98%), but did not induce nitrogen and water deficiencies. Defoliation-induced abscission was preceded by rises (up to 20-fold) in the levels of abscisic acid (ABA) and 1-aminocyclopropane-1-carboxylic acid (ACC) in fruitlets. Applications to defoliated plants showed that ABA increased ACC levels (2-fold) and accelerated fruitlet abscission, whereas norflurazon and 2-aminoethoxyvinyl glycine reduced ACC (up to 65%) and fruitlet abscission (up to 40%). Only the fun defoliation treatment reduced endogenous gibberellin Al (4-fold), whereas exogenous gibberellins had no effect on abscission. The data indicate that fruitlet abscission induced by carbon shortage in citrus is regulated by ABA and ACC originating in the fruits, while gibberellins are apparently implicated in the maintenance of growth. In this system, ABA may act as a sensor of the intensity of the nutrient shortage that modulates the levels of ACC and ethylene, the activator of abscission. This proposal identifies ABA and ACC as components of the self-regulatory mechanism that adjusts fruit load to carbon supply, and offers a physiological basis for the photoassimilate competition-induced abscission occurring under natural conditions. 2017-06-01T10:12:05Z 2017-06-01T10:12:05Z 2000 MAR 2000 article Gomez-Cadenas, A., Mehouachi, J., Tadeo, F.R., Primo-Millo, E., Talón, M. (2000). Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus. Planta, 210(4), 636-643. 0032-0935 http://hdl.handle.net/20.500.11939/5295 10.1007/s004250050054 en openAccess Impreso |
| spellingShingle | Gómez-Cadenas, Aurelio Mehouachi, J. Tadeo, Francisco R. Primo-Millo, Eduardo Talón, Manuel Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title | Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title_full | Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title_fullStr | Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title_full_unstemmed | Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title_short | Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| title_sort | hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus |
| url | http://hdl.handle.net/20.500.11939/5295 |
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