Effect of pre-harvest applications of ethephon on leaf abscission, fruit drop and constituents of fruit juice in pomegranates

1973 ◽  
Vol 48 (3) ◽  
pp. 293-296 ◽  
Author(s):  
Bijan Shaybany ◽  
Habib Sharifi
Keyword(s):  
Fruit Juice ◽  
Leaf Abscission ◽  
Fruit Drop

scholarly journals Fruit drop: II. Biological background of flower and fruit drop

2006 ◽  
Vol 12 (3) ◽  
Author(s):  
J. Racskó ◽  
M. Soltész ◽  
Z. Szabó ◽  
J. Nyéki
Keyword(s):  
Water Stress ◽  
Abscission Zone ◽  
Leaf Abscission ◽  
Fruit Drop ◽  
Windy Weather ◽  
Environmental Causes ◽  
Generative Organs

The most important components of fruit drop are: the rootstock, the combination of polliniser varieties, the conditions depending of nutrition, the extent and timing of the administration of fertilisers, the moments of water stress and the timing of agrotechnical interventions. Further adversities may appear as flushes of heat and drought, the rainy spring weather during the blooming period as well as the excessive hot, cool or windy weather impairing pollination, moreover, the appearance of diseases and pests all influence the fate of flowers of growing and become ripe fruits. As generally maintained, dry springs are causing severe fruit drop. In analysing the endogenous and environmental causes of drop of the generative organs (flowers and fruits), the model of leaf abscission has been used, as a study of the excised, well defined abscission zone (AZ) seemed to be an adequate approach to the question. Comparing the effects active in the abscission of fruit with those of the excised leaf stem differences are observed as well as analogies between the anatomy and the accumulation of ethylene in the respective abscission tissues.

scholarly journals Citrus Fruit Abscission Induced by Methyl-jasmonate

2000 ◽  
Vol 125 (5) ◽  
pp. 547-552 ◽  
Author(s):  
Ulrich Hartmond ◽  
Rongcai Yuan ◽  
Jacqueline K. Burns ◽  
Angela Grant ◽  
Walter J. Kender
Keyword(s):  
Methyl Jasmonate ◽  
Citrus Sinensis ◽  
Field Experiments ◽  
Citrus Fruit ◽  
Leaf Abscission ◽  
Ethylene Concentration ◽  
Fruit Abscission ◽  
Detachment Force ◽  
Fruit Drop

Methyl jasmonate (MJ) was tested as a potential abscission chemical to enhance mechanical harvest of `Hamlin' and `Valenica' orange [Citrus sinensis (L.) Osb.]. In field experiments, a solution of 1, 5, 10, 20, or 100 mm MJ was applied either as a stem wrap to individual fruit or as a spray to entire trees or canopy sectors. Solutions of 10, 20, and 100 mm MJ resulted in significant and consistent reduction of fruit detachment force and caused fruit drop within 7 to 10 days. Fruit loosening was preceded by an increase in the internal ethylene concentration of fruit similar to that of other experimental abscission compounds. While concentrations of 10 mm and less caused no or negligible phytotoxicity, solutions exceeding 10 mm MJ induced unacceptable levels of leaf abscission.

scholarly journals Response of Clementine Mandarin to Water-Saving Strategies under Water Scarcity Conditions

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2439
Author(s):  
Mohamed El-Otmani ◽  
Anouar Chouaibi ◽  
Charif Azrof ◽  
Lhoussaine Bouchaou ◽  
Redouane Choukr-Allah
Keyword(s):  
Water Use ◽  
Water Scarcity ◽  
Deficit Irrigation ◽  
Fruit Juice ◽  
Fruit Size ◽  
Fruit Maturation ◽  
Crop Water ◽  
Fruit Drop ◽  
Semi Arid ◽  
Juice Content

Water scarcity is the most constraining factor for crop production, especially in arid and semi-arid areas of Mediterranean countries such as Morocco. Within these conditions, different water-saving strategies using deficit irrigation (DI) were tested on two six-years old clementine varieties (‘Sidi Aissa’ and ‘Orogrande’). These DI strategies were applied during the second part of fruit growth and during fruit maturation and included: the control treatment (Cntl), in which the trees received 100% of crop evapotranspiration (ETc) for the entire irrigation season; regulated deficit irrigation (RDI), with an application of 75% of ETc (RDI-1); partial rootzone drying (PRD), with an alternating irrigation between the two root system halves for 3–4 (PRD-3/4) and 7 (PRD-7) days, with an application of 50% crop water requirements; and RDI-2, with an application of 50% of crop water needs during fruit maturation. The results indicate that the trees preferably absorb the water from the upper 0–30 cm-depth soil profile and that fruit drop was increased by PRD for ‘Sidi Aissa’, whereas RDI-1 had no effect on this parameter. The DI strategies had no effect on fruit drop for ‘Orogrande’. The PRD reduced fruit size, yield and fruit juice content, with the effect being more pronounced on ‘Sidi Aissa’. The RDI-1 had no effect on fruit yield for ‘Orogrande’ but reduced it for ‘Sidi Aissa’. RDI-2 had no effect on yield, fruit size or fruit juice content. The DIs tested increased water use efficiency and enhanced fruit maturation as a result of increased juice sugar content and reduced acidity. The PRD tends to increase salt accumulation in the rootzone. Overall, ‘Orogrande’ was less sensitive to water stress and was more water-use efficient, and, under the semi-arid conditions of the experimental zone, PRD should not be used on clementine.

PENGARUH PEMBERIAN BELIMBING DAN MENTIMUN TERHADAP PENDERITA HIPERTENSI DI DESA LAU KERSIK KECAMATAN GUNUNG SITEMBER KABUPATEN DAIRI

2019 ◽  
Vol 2 (1) ◽  
pp. 18-23
Author(s):  
Herri Novita Br Tarigan ◽  
Prista Hotmarina Purba
Keyword(s):  
Blood Pressure ◽  
Data Analysis ◽  
Fruit Juice ◽  
Blood Pressure Reduction ◽  
Reduce Blood Pressure ◽  
Pharmacological Therapy ◽  
Hypertensive Patients ◽  
Star Fruit ◽  
Equivalent Time ◽  
Life Threatening

Hypertension is a disease that is not uncommon in the community, including the Bukit Lau Kersik village. People with hypertension often do not show long-term symptoms and can be life-threatening. However, one of the management of hypertension that can be used as non-pharmacological therapy is consuming starfruit juice and cucumber which is quite easy to find in the Bukit Lau Kersik village. This combination of juices contains potassium which can reduce blood pressure in patients with hypertension. This study used Equivalent Time Sample Design with 14 subjects with hypertension in the Bukit Lau Kersik Village, Gunung Sitember Subdistrict, Dairi District. The technique of this research sample used Non-Probability Sampling with Saturated Sampling. The instrument used was a sphygmomanometer and a stethoscope. Bivariate data analysis in this study was the Wilcoxon statistical test. Based on the data analysis performed, the value of p = 0.011 (p= < 0.05) was obtained, meaning that there was a significant relationship between giving star fruit juice and cucumber to hypertensive patients. Then it can be concluded that there is an influence between giving star fruit and cucumber juice to blood pressure reduction in hypertensive patients in Bukit Lau Kersik Village Gunung Sitember Subdistrict, Dairi District in 2019. Suggestion: The factors that affect blood pressure in hypertensive patients and checking blood pressure before drinking star fruit juice and cucumber.

scholarly journals Multiple season-long sprays of ethephon or NAA combined with calcium chloride on ‘Honeycrisp’ apples: I. Effect on bloom and fruit quality attributes

2019 ◽  
Vol 99 (4) ◽  
pp. 444-459
Author(s):  
John A. Cline
Keyword(s):  
Calcium Chloride ◽  
Fruit Quality ◽  
Quality Attributes ◽  
Naphthaleneacetic Acid ◽  
Fruit Firmness ◽  
Biennial Bearing ◽  
Fruit Drop ◽  
Fruit Maturity ◽  
Return Bloom ◽  
Honeycrisp Apples

‘Honeycrisp’ apple trees are highly prone to biennial bearing and predisposed to bitter pit. The hypothesis that tank mix sprays of ethephon (ETH), naphthaleneacetic acid (NAA), and 1-aminocyclopropane carboxylic acid (ACC) combined with calcium chloride (CaCl2) can mitigate these production problems was tested in a 3-yr study. Mature ‘Honeycrisp’ trees were treated with either three or six summer applications of 150 mg L−1 ETH or 5 mg L−1 NAA, all tank-mixed with and without CaCl2, or two or five applications of 150 mg L−1 ACC (without CaCl2). Treatments were applied at 10-d intervals and initiated between 21 and 26 June. All treatments had little effect on enhancing return bloom of ‘Honeycrisp’. NAA, ETH, and CaCl2 all influenced fruit maturity and quality at harvest to varying degrees and across years. Fruit treated with NAA were firmer compared with untreated fruit in 2 out of 3 yr, whereas overall, fruit treated with six sprays of ETH had lower fruit firmness and were more mature. NAA had less influence on fruit quality attributes at harvest than did ETH, and decreased pre-harvest fruit drop (PFD). PFD increased with ETH in 1 out of 2 yr, whereas ACC and NAA both decreased PFD in 1 out of 2 yr. Overall, ETH and NAA, with or without CaCl2, had significant but inconsistent effects on fruit quality and maturity, all dependent on the year and number of applications. Adding CaCl2 decreased fruit firmness in 2 out of 3 yr.

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