Hormonal Regulation of Fruit Set and Abscission in Citrus: Classical Concepts and New Evidence

Talón, Manuel; Tadeo, Francisco R.; Ben-Cheikh, W.; Gómez-Cádenas, Aurelio; Mehouachi, J.; Pérez-Botella, J.; Primo‐Millo, Eduardo

doi:10.17660/actahortic.1998.463.24

Cited by 37 publications

(37 citation statements)

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“…Esse tipo de brotação com maior relação folha/ fruto geralmente apresenta maior vingamento, pegamento, retenção de frutos, taxa inicial de crescimento e tamanho final de frutos (ERNER & SHOMER, 1996;GUARDIOLA & GARCÍA-LUIS, 1998;TALON et al, 1998), provavelmente porque as inflorescências com folhas têm maior disponibilidade de carboidratos, maior força de dreno e melhor conexão vascular com o fruto, em decorrência da maior produção de hormônios pelas folhas (DAVIES & ALBRIGO, 1994).…”

Section: Resultsunclassified

Avaliação do potencial hídrico foliar, umidade do solo e temperatura do ar no período pré- florescimento dos citros

et al. 2007

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O trabalho foi conduzido em um pomar de citros localizado no Setor de Fruticultura do Departamento de Fitotecnia da Universidade Federal de Viçosa-UFV/Viçosa-MG, no período de março a setembro de 2004. O objetivo foi avaliar a influência do potencial hídrico das folhas e do solo sobre o florescimento da tangerineira 'Poncã', laranjeira 'Serra d'Água'e limeira ácida 'Tahiti' nas condições climáticas de Viçosa-MG. A temperatura do ar (ºC) e a precipitação pluviométrica (mm) foram avaliadas diariamente durante o período experimental. O potencial hídrico no solo e nas folhas foi avaliado em dois horários (7:00 às 8:00 h manhã e 13:00 às 14:00 h tarde). As cultivares utilizadas foram laranjeira 'Serra d'Água'(Citrus sinensis (L.) Osb.), tangerina 'Poncã' (Citrus reticulata Blanco) e limeira ácida 'Tahiti' (Citrus latifolia Tanaka.), enxertadas sobre limoeiro 'Cravo' (Citrus limonia Osb.). Observou-se que o potencial hídrico foliar dos citros diminuiu sob condições de altas temperaturas e déficit hídrico no solo, entretanto, varia em função dos cultivares, observando-se os maiores valores para a limeira 'Tahiti'. O florescimento ocorreu após um período de baixas temperaturas seguido por uma redução do potencial hídrico do solo. A limeira ácida 'Tahiti' é mais precoce, quando comparada com a tangerineira 'Poncã' e a laranjeira 'Serra D'Água'.

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Section: Resultsunclassified

Avaliação do potencial hídrico foliar, umidade do solo e temperatura do ar no período pré- florescimento dos citros

et al. 2007

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“…It is possible that the stress of preventing the flow of photosynthates stimulated ethylene biosynthesis in the fruit (Bangerth, 2000;Berüter and Droz, 1991;Talon et al, 1997). Further molecular biological research is required to elucidate the mechanisms that underlie the induction and regulation of ethylene biosynthesis.…”

Section: Discussionmentioning

confidence: 99%

“…In other words, the normal translocation of photosynthate via phloem transport from leaves to fruit may be a factor in delaying on-tree ethylene evolution. There is a large body of evidence that physiological fruit drop or 'June drop' in young fruit of many species is due to competition for photosynthates among fruit and between fruit and shoots (Bangerth, 2000;Berüter and Droz, 1991;Talon et al, 1997). Thus, it is a reasonable assumption that assimilates could be the major 'tree factor' in young fruit.…”

Section: Introductionmentioning

confidence: 99%

Effects of Photosynthate Transport and Water Flow to Young Fruit on Fruit Drop via Ethylene Synthesis in Persimmon (Diospyros kaki Thunb.)

Sun

Adachi

Kadowaki

et al. 2010

J. Japan. Soc. Hort. Sci.

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In this study, we aimed to characterize which factors control ethylene production and fruit drop in persimmon (Diospyros kaki Thunb.). We determined the effects of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU; a specific photosynthesis inhibitor) and defoliation treatments on the photosynthetic rate, transpiration rate, sap flow, fruit drop, and ethylene evolution. DCMU treatment, which prevented photosynthate transport but allowed water flow, promoted fruit drop by 67% 10 days after treatment. Defoliation treatment, which prevented both photosynthate and water transport, significantly hastened fruit drop. On average, fruit drop occurred 2 days earlier with defoliation treatment than DCMU treatment. Compared with the control, treated fruit attached to the tree showed an increasing trend in ethylene production, although at a low level (≦ 0.8 nL·g −1 ·h −1 in the flesh; ≦ 20 nL·g −1 ·h −1 in the calyx). Fruit abscission is thought to be induced by a following ethylene burst, because fruit showing an abscission trend showed high rates of ethylene production (almost 200 nL·g −1 ·h −1 ). Thus, blocking photosynthate transport and water flow induced initial and autocatalytic increases in the production of ethylene, which plays a crucial role in triggering fruit drop. Overall, our results suggest that the transport of photosynthates, or both photosynthates and water, to fruit inhibits fruit drop by preventing the induction of ethylene synthesis in young persimmon fruit.

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“…However, when out-ofseason flowers received 10 mg·L -1 GA 3 , the percentage of fruit set was 12.75. This increase was probably related to the sink power of exogenous gibberellic acid applied to the 'Tahiti' lime flowering branches [4]. The variance analysis and F test showed that the difference of average fruit set of out-of-season 'Tahiti' limes for different concentrations of gibberellic acid was significant.…”

Section: Fruit Set Related To Gibberellic Acid Applicationmentioning

confidence: 90%

“…In seedy varieties, fruit set depends on increased levels of endogenous hormones synthesized in the seeds, especially gibberellins, that increase the demand for photosynthetic products and minerals and, therefore, reduce the abscission of ovaries and young fruits [4,5]. In parthenocarpic varieties, fruit set is probably influenced by the ovary walls where the synthesis of the receptors that regulate fruit set normally occurs [6].…”

Section: Introductionmentioning

confidence: 99%

`Tahiti' lime fruit set related to gibberellic acid application on out-of-season flowering and the accumulation of degree days

Spósito¹,

Filho²

2003

Fruits

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'Tahiti' lime fruit set related to gibberellic acid application on out-of-season flowering and the accumulation of degree days.Abstract -Introduction. The production of 'Tahiti' limes in southern Brazil has increased in the last 20 years and has become a good alternative for citrus growers in regions where Citrus Variegated Chlorosis has affected sweet orange groves. One of the main goals to insure success in growing 'Tahiti' limes is to apply the right techniques to induce out-of-season flowering and winter fruit harvest when the fruit prices are the highest. This experiment evaluated the effects of gibberellic acid application on fruit set of 'Tahiti' lime trees related to out-of-season flowering and accumulated degree days. Materials and methods. Eight-year-old plants were treated with five concentrations of gibberellic acid [ (0, 10, 25, 50 and 100) mg·L-1 ] applied during anthesis of out-of-season bloom. Accumulation of degree days for fruit set and fruit development in the conditions of São Paulo State, Brazil, were calculated. The percentage of fruit set determined by weekly counts of the number of flowers from anthesis to the maturation of the fruits were determined on each previously marked branch. Data were submitted to regression analysis. Results and discussion. In regard to fruit set, it was observed that 10 mg gibberellic acid·L -1 was enough to retain more than 10% of fruits in relation to the number of formed flowers. Starting from anthesis, (837.7 and 1 115.2) accumulated degree days were necessary for the stabilization of the fruit set and fruit maturation, respectively. Brazil / Citrus latifolia / flowering / fruiting / plant developmental stages / maturation / plant growth substances

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Hormonal Regulation of Fruit Set and Abscission in Citrus: Classical Concepts and New Evidence

Cited by 37 publications

References 0 publications

Avaliação do potencial hídrico foliar, umidade do solo e temperatura do ar no período pré- florescimento dos citros

Avaliação do potencial hídrico foliar, umidade do solo e temperatura do ar no período pré- florescimento dos citros

Effects of Photosynthate Transport and Water Flow to Young Fruit on Fruit Drop via Ethylene Synthesis in Persimmon (Diospyros kaki Thunb.)

`Tahiti' lime fruit set related to gibberellic acid application on out-of-season flowering and the accumulation of degree days

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