scholarly journals Postharvest melatonin treatment inhibited longan ( Dimocarpus longan Lour.) pericarp browning by increasing ROS scavenging ability and protecting cytomembrane integrity

2021 ◽  
Author(s):  
Tao Luo ◽  
Feilong Yin ◽  
Lingyan Liao ◽  
Yunfen Liu ◽  
Boyang Guan ◽  
...  
Keyword(s):  
Ros Scavenging ◽  
Melatonin Treatment ◽  
Dimocarpus Longan ◽  
Pericarp Browning

Water loss and pericarp browning of litchi (Litchi chinensis) and longan (Dimocarpus longan) fruit maintain seed vigor

2021 ◽  
Vol 290 ◽  
pp. 110519
Author(s):  
Bin Liu ◽  
Wei-wen Xue ◽  
Ze-li Guo ◽  
Si-yu Liu ◽  
Qiu-nan Zhu ◽  
...  
Keyword(s):  
Water Loss ◽  
Seed Vigor ◽  
Litchi Chinensis ◽  
Dimocarpus Longan ◽  
Pericarp Browning

scholarly journals Influence of Packaging on Quality Retention of Longans (Dimocarpus longan) Under Constant and Fluctuating Postharvest Temperatures

HortScience ◽  
2011 ◽  
Vol 46 (6) ◽  
pp. 917-923 ◽  
Author(s):  
Marisa M. Wall ◽  
Kate A. Nishijima ◽  
Lisa M. Keith ◽  
Mike A. Nagao
Keyword(s):  
Shelf Life ◽  
Fruit Quality ◽  
Disease Incidence ◽  
Chilling Injury ◽  
Visual Quality ◽  
Fruit Production ◽  
Quality Ratings ◽  
Dimocarpus Longan ◽  
Pericarp Browning ◽  
Fluctuating Temperatures

Longan (Dimocarpus longan) fruit production and global exports are rapidly expanding. Consumer acceptance of this high value crop requires that fruit arrive in excellent condition. Pericarp browning and fungal diseases are the main postharvest problems for longans. Research was conducted to establish optimum storage temperatures and packaging systems to retain fruit quality of ‘Biew Kiew’ longans. Average respiration rates for longans stored at 20 °C (61.6 mg CO2/kg/h) were about twice the rate as those stored at 10 °C (32.7 mg CO2/kg/h) and triple the rate for those stored at 5 °C (21.1 mg CO2/kg/h). Ethylene rates were below 0.4 μg·kg−1·h−1. Fruit quality and shelf life were greatest when stored at 10 °C. Longans held at 20 °C were unmarketable after 10 d, and fruit stored at 5 °C exhibited chilling injury (CI). After storage at 10 °C, longans packaged in microperforated (MP) bags, clamshell (CL) containers, or Peakfresh® film (PF) had the highest visual quality ratings, lowest disease incidences, and longest shelf life when compared with fruit in Lifespan® film (LS) or fiberboard boxes. The most promising packages (MP, CL, PF) were evaluated further under constant 10 °C or simulated shipping (SS) conditions with fluctuating temperatures (22 °C/10 °C/22 °C). Longans in CL containers had the highest visual quality and lowest disease incidence when stored at 10 °C, but there were no differences among package treatments under SS conditions. Also, sensory ratings were greatest for fruit packed in CL or PF when stored at 10 °C but all sensory scores decreased under SS temperatures. When longans were stored under fluctuating temperatures, aril texture and flavor ratings were highest for CL packages. CL, PF, and MP are suitable packages for longans stored under optimal temperatures. However, for longans stored under SS conditions, sensory quality was highest when packaged in CL containers.

Exogenous melatonin improves pear resistance to Botryosphaeria dothidea by increasing autophagic activity and sugar/organic acid levels

2022 ◽  
Author(s):  
Yun Wang ◽  
Guoming Wang ◽  
Wenyu Xu ◽  
Zhenwu Zhang ◽  
Xun Sun ◽  
...  
Keyword(s):  
Organic Acid ◽  
Soluble Sugar ◽  
Pyrus Pyrifolia ◽  
Botryosphaeria Dothidea ◽  
Ros Scavenging ◽  
Pear Fruit ◽  
Melatonin Treatment ◽  
Exogenous Melatonin ◽  
Enhanced Resistance ◽  
Autophagic Activity

Pear is a perennial deciduous fruit tree of the Rosaceae Pyrus genus, and is one of the main fruit trees worldwide. The pathogen Botryosphaeria dothidea infects pear trees and causes pear ring rot disease. According to our research, exogenous melatonin application enhanced resistance to B. dothidea in pear fruit. Melatonin treatment of pears significantly reduced the diameter of disease spots and enhanced the endogenous melatonin content under B. dothidea inoculation. Compared with H2O treatment, melatonin treatment suppressed the increase in ROS and activated ROS-scavenging enzymes. Treatment with exogenous melatonin maintained AsA-GSH at more reductive status. The expression levels of core autophagic genes and autophagosome formation were elevated by melatonin treatment in pear fruit. The silencing of PbrATG5 in Pyrus pyrifolia conferred sensitivity to inoculation, which was only slightly recovered by melatonin treatment. After inoculation with B. dothidea, exogenous melatonin treatment increased the contents of soluble sugars and organic acids in pear fruits compared with H2O treatment. Our results demonstrated that melatonin enhanced resistance to B. dothidea by increasing the autophagic activity and soluble sugar/organic acid accumulation.

PEMBERIAN ZPT ALAMI BAWANG MERAH DAN AIR KELAPA UNTUK PERTUMBUHAN STEK PUCUK LENGKENG ( Dimocarpus longan Lour )

2018 ◽  
Vol 1 (01) ◽  
pp. 276-284
Author(s):  
Vivi Wahyuni ◽  
Elfi Yenny Yusuf ◽  
Yoyon Riono
Keyword(s):  
Dimocarpus Longan

Penelitian Pemberian Zat Pengatur Tumbuh Alami Bawang Merah Dan Air Kelapa UntukPertumbuhan Stek Pucuk Lengkeng ( Dimocarpus longan Lour ) di Desa Danau Pulai IndahKecamatan Kempas Kabupaten Indragiri Hilir selama 3 bulan dimulai dari bulan Junisampai dengan Agustus 2017. Tujuan dari penelitian ini adalah Untuk mengetahui pengaruhpemberian Zat Pengatur Tumbuh bawang merah dan air kelapa untuk pertumbuhan stekpucuk lengkeng (Dimocarpus longan Lour).Penelitian ini menggunakan rancangan acak lengkap (RAL) non faktorial dengan terdiridari 2 faktor pertama adalah dosis pupuk yang terdiri dari 7 taraf perlakuan dengan 3ulangan setiap percobaan terdapat 5 unit tanaman sehingga terdapat 105 tanaman.Perlakuan yang digunakan adalah Air Mineral / Kontrol, air kelapa 20% ( 200 ml/l air), airkelapa 25% ( 250 ml/l air), air kelapa 30% ( 300 ml/l air), ekstrak Bawang Merah 0,5% ( 5ml/l air), ekstrak Bawang Merah 1% ( 10 ml/l air) dan ekstrak Bawang Merah 1,5% ( 15ml/l air)Parameter pengamatan pada penelitian ini yaitu, Umur Muncul Tunas (hari), Jumlah Tunas(buah), Panjang Tunas (cm), Volume Akar (ml) dan Persentase Stek Bertunas (%). Datapengamatan dianalisis dengan sidik ragam, (ANOVA) dan dilanjutkan dengan uji lanjutTurkey HSD pada tahaf 5%.Pemberian ZPT bawang merah dan air kelapa mampu meningkatkan pertumbuhan stekpucuk tanaman lengkeng, umur muncul tunas yang terbaik pada perlakuan air kelapa 25% (250 ml/l air) dan ekstrak bawang merah 1,5% ( 15 ml/l air), terhadap jumlah tunas yangterbaik pada perlakuan ekstrak bawang merah 1% ( 10 ml/l air), perlu penelitian lanjutanpemberian konsentrasi ekstrak bawang merah dan air kelapa yang lebih tinggi mampumempengaruhi pertumbuhan stek.

Effects of ageing and exogenous melatonin on pituitary responsiveness to GnRH in rats

Reproduction ◽  
2000 ◽  
pp. 151-156 ◽  
Author(s):  
E Diaz ◽  
D Pazo ◽  
AI Esquifino ◽  
B Diaz
Keyword(s):  
Body Weight ◽  
Reproductive System ◽  
Plasma Concentrations ◽  
Pituitary Hormones ◽  
Female Rats ◽  
Control Groups ◽  
Melatonin Treatment ◽  
Exogenous Melatonin ◽  
Reproductive Axis ◽  
Effect Of Age

The effect of age and melatonin on the activity of the neuroendocrine reproductive system was studied in young cyclic (3-5 months-old), and old acyclic (23-25 month-old) female rats. Pituitary responsiveness to a bolus of GnRH (50 ng per 100 g body weight) was assessed at both reproductive stages in control and melatonin-treated (150 micrograms melatonin per 100 g body weight each day for 1 month) groups. After this experiment, female rats were treated for another month to study the influence of ageing and melatonin on the reproductive axis. Plasma LH, FSH, prolactin, oestradiol and progesterone were measured. A positive LH response to GnRH was observed in both control groups (cyclic and acyclic). However, a response of greater magnitude was observed in old acyclic rats. Melatonin treatment reduced this increased response in acyclic rats and produced a pituitary responsiveness similar to that of young cyclic rats. FSH secretion was independent of GnRH administration in all groups, indicating desynchronization between LH and FSH secretion in response to GnRH in young animals and during senescence. No effect on prolactin was observed. Significantly higher LH (3009.11 +/- 1275.08 pg ml(-1); P < 0.05) and FSH concentrations (5879.28 +/- 1631.68 pg ml(-1); P < 0.01) were seen in acyclic control rats. After melatonin treatment, LH (811.11 +/- 89.71 pg ml(-1)) and FSH concentrations (2070 +/- 301.62 pg ml(-1)) decreased to amounts similar to those observed in young cyclic rats. However, plasma concentrations of oestradiol and progesterone were not reduced. In conclusion, the results of the present study indicate that, during ageing, the effect of melatonin is exerted primarily at the hypothalamo-pituitary axis rather than on the ovary. Melatonin restored the basal concentrations of pituitary hormones and pituitary responsiveness to similar values to those observed in young rats.

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