Metodologia para determinação da zona de abscisão foliar em pomáceas

Meyer, Geraldine de Andrade; Souza, Thaysi Ventura de; Sanhueza, Rosa Maria Valdebenito; Rufato, A. de R.; Rufato, Léo; Santos, Marisa

doi:10.1590/s0103-84782014000600005

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…[22], ABA plays a crucial r water stress conditions, promoting stomata closure, growth inhibition, bud dormancy and foliar senescence. In the case of water stress situations, the accumulation of abscisic acid occurs, reducing stomatal conductance, due to its stomata being Therefore, a possible accumulation of ABA due to water stress may have been the reason for the most pronounced defoliation in all treatments with ABA in the first season, agreeing with the results found by [24] and Meyer et al [25].…”

Section: Percentage Of Leaf Fall In 'Fuji Suprema' Apple Plants Submisupporting

confidence: 90%

Induction of Senescence and Foliar Abscission in Apple Trees with the Use of Abscisic Acid

Esperança

Petri

Rossi

et al. 2019

JEAI

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Aims: Evaluate the effects of different concentrations of abscisic acid (ABA) on adult plants of productive age of ‘Daiane’ and ‘Fuji Suprema’, to follow the ecophysiological effects and their efficiency in inducing leaf senescence, sprouting and productivity, in the Midwestern region of the state of Santa Catarina. Study Design: The experiment was arranged in a randomized block design with six replications. Place and Duration of Study: The experiment was carried out in the municipality of Caçador, Brazil (latitude 26º50’07” S, longitude 50º58’32” W, altitude 969 meters), during the growing seasons of 2013/2014 and 2014/2015. Methodology: The apple fruit tree were submitted to the following treatments: 1) Control (without treatment), 2) abscisic acid 750 mg L-1, 3) abscisic acid 750 + 750 mg L-1, 4) abscisic acid 1500 mg L-1 and 5) abscisic acid 1500 + 1500 mg L-1. ABA applications in the first year were carried out on May 2, 2013 in treatments 2, 3, 4, and 5, and after 11 days (05/13/13) the plants of treatments 3 and 5 were sprayed again. In the second year, ABA applications were carried out on May 6 and 15, 2014, following the same application methodology described for the first year. As the source of abscisic acid (ABA) the commercial product ProTone® (20% i.a.) was used, without the use of adjuvant. The exogenous application of ABA was effective in promoting the senescence and leaf fall of the ‘Daiane’ and ‘Fuji Suprema’ cultivars. In the 2013/2014 season, the concentration of 750 mg L-1 was enough to induce 100% leaf fall in 'Daiane' plants. However, a difference was observed between the concentrations of ABA used. There was a difference between concentrations and number of applications. Lower concentrations were efficient and deflated as much as the higher concentration. The application of ABA induces the abscission of apple leaves in early autumn in 'Daiane' and 'Fuji Suprema' apple plants. The ABA does not affect shoots of axillary buds and anticipates the beginning of shoots.

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Section: Percentage Of Leaf Fall In 'Fuji Suprema' Apple Plants Submisupporting

confidence: 90%

Induction of Senescence and Foliar Abscission in Apple Trees with the Use of Abscisic Acid

Esperança

Petri

Rossi

et al. 2019

JEAI

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“…Another consideration is the natural occurrence of senescence. Abscission can be regarded as a final result of the leaf senescence process, occurring as the organs advance in age (Meyer et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

<b>Manihot leaf abscission induced by ethrel

et al. 2018

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This study aimed to assess the impact of ethrel spraying on cassava leaf abscission at different stages of cultivar development. Two experiments were performed using randomized block designs, with 15 total treatments (three repetitions of five conditions) arranged according to the factorial scheme 3 x 5. Experiment 1 (ethrel application in the vegetative development period) consisted of three seasons (November 2013 and 2014, January and February 2014) and four concentrations of ethrel (1,500, 3,000, 4,500, and 6,000 ppm) and a control (no application); Experiment 2 (application in pre-harvest period) consisted of three periods of ethrel spraying (20, 40, and 60 days before harvest), four ethrel concentrations (1,500, 3,000, 4,500, and 6,000 ppm) and a control (without ethrel). The characteristics evaluated included the number of fallen leaves at 20 and 70 days after application, total leaf dry mass and foliar degreening. The effects of different concentrations and times of application of ethrel were significant during the first seven days. Ethrel application during the second period of vegetative development did not affect the number of fallen leaves over a period of 70 days.

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Metodologia para determinação da zona de abscisão foliar em pomáceas

Cited by 2 publications

References 10 publications

Induction of Senescence and Foliar Abscission in Apple Trees with the Use of Abscisic Acid

Induction of Senescence and Foliar Abscission in Apple Trees with the Use of Abscisic Acid

<b>Manihot leaf abscission induced by ethrel

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