scholarly journals Effect of Controlled Atmospheres with Low Oxygen Levels on Extended Storage of Guava Fruit (Psidium guajava L. ‘Pedro Sato’)

HortScience ◽  
2010 ◽  
Vol 45 (6) ◽  
pp. 918-924 ◽  
Author(s):  
Gustavo H.A. Teixeira ◽  
José F. Durigan
Keyword(s):  
Psidium Guajava ◽  
Reducing Sugar ◽  
Low Oxygen ◽  
Ripening Process ◽  
Green Color ◽  
Controlled Atmospheres ◽  
Guava Fruit ◽  
Ambient Storage ◽  
Different Levels ◽  
Oxygen Concentrations

The effects of controlled atmospheres (CAs) containing different levels of oxygen (air, 21, 15, 10, 5, and 1 kPa) were investigated during cold storage of ‘Pedro Sato’ guava at 12.5 °C for 28 days. Atmospheres with lower O2 concentrations (1 and 5 kPa) significantly reduced respiratory rates and delayed the ripening process. This was confirmed by maintenance of fruit green color, higher total soluble, and reducing sugar contents. The control fruits and those stored in elevated oxygen concentrations (21 kPa) presented a climacteric peak. However, the peak was not observed for fruit maintained in atmospheres containing 1, 5, 10, and 15 kPa O2. After transferring the fruits from CA to ambient storage, they ripened normally in just 2 d without presenting any low O2 injury symptoms, even from the lowest oxygen concentrations (1 and 5 kPa O2). This supports the use of low-oxygen atmospheres for extended storage of ‘Pedro Sato’ guava fruit.

Chilling injury is associated with changes in microsomal membrane lipids in guava fruit (Psidium guajava L.) and the use of controlled atmospheres reduce these effects

2018 ◽  
Vol 240 ◽  
pp. 94-101 ◽  
Author(s):  
J.E. Alba-Jiménez ◽  
P. Benito-Bautista ◽  
G.M. Nava ◽  
D.M. Rivera-Pastrana ◽  
Ma. E. Vázquez-Barrios ◽  
...  
Keyword(s):  
Membrane Lipids ◽  
Chilling Injury ◽  
Psidium Guajava ◽  
Microsomal Membrane ◽  
Controlled Atmospheres ◽  
Guava Fruit

Guava (Psidium guajava L.) Fruit Coating with Gum – Arabic for Quality and Fruit Fly Control

1970 ◽  
pp. 01-04
Author(s):  
Esameldin B. M. Kabbashi, Ghada H. Abdelrahman and Nawal A. Abdlerahman
Keyword(s):  
Shelf Life ◽  
Gum Arabic ◽  
Fruit Fly ◽  
Psidium Guajava ◽  
Postharvest Quality ◽  
Guava Fruit ◽  
Fruit Shelf Life ◽  
Fly Control ◽  
And Control ◽  
Subtropical Fruit

Guava (Psidium guajava L.) is a lovely tropical and subtropical fruit that originates in Mexico, Central America, and then taken to other distant and near parts around the world. In Sudan this popular fruit is produced in orchards and household and is so profitable but yet attacked by a lot of fruit fly species of the Genera Ceratitis and Bactrocera and the result is a loss of more than 70%. This research aimed at evaluating the effect of Gum Arabic coating (GAC) in extending the shelf life of guava fruit and disinfesting it from these notorious pests. Guava fruits from Kadaro orchards, Khartoum North, were tested using seven concentrations of Gum Arabic solutions. The results reflect that 1: 4 (25%) and 1: 8 (12.5%) (GA: water) concentrations attained 56 and 40% disinfestation, respectively whereas the other lower concentrations effected corresponding results in a range from 20 – 08%. The reduction in maggots per test fruit reached upto 188% as compared to the control.  The highest concentrations (1: 4 & 1: 8) effected a sustainability of 52% in fruit firmness (FF) with an average of medium (3) FF compared to soft FF (4) in the control. The corresponding results in other lower concentrations (1: 16; 1: 32; 1: 64; 1: 72 & 1: 96) were 36, 24, 24, 20 and 16%, respectively. In addition to an average FF of 4 (soft) for all these concentrations and 5 (very soft) for all the corresponding controls. Nevertheless, the sustainability of fruit color (FC) effected by the test concentrations was 52, 44, 24, 22, 24, 20, and 24%, respectively. Regarding these results, the two highest test concentrations effected a sizeable disinfestation and control of fruit flies and a good extension of shelf life of guava in Khartoum State. These findings support using this treatment as an effective IPM tool to extend guava fruit shelf life and upgrading its postharvest quality.

The effect of post-harvest storage on the weight of Golden Delicious apples

2021 ◽  
Vol 13 (2) ◽  
pp. 7-11
Author(s):  
Salma Kassebi ◽  
Péter Korzenszky
Keyword(s):  
Relative Humidity ◽  
Storage Temperature ◽  
Extended Period ◽  
Food Products ◽  
Significant Loss ◽  
Loss Of Weight ◽  
Ambient Storage ◽  
Golden Delicious ◽  
Different Levels ◽  
Careful Management

Apples, like other fruits, are exposed to stress during their growth and development in the field, also during harvest and the postharvest environment (processing, storage, and transportation). The refrigeration system allows for bulk handling of food products from harvest to market, ensuring that food products are maintained in their freshness and integrity for an extended period through careful management of storage temperature and humidity. This study investigated the effects of storage on the weight loss of apples (Golden Delicious fruits harvested at maturity), under refrigerated conditions at a temperature of 5±0.5°C and relative humidity of 82% and under ambient storage at a temperature of 25 ±0.5 °C and relative humidity of 60 %, over 3 months. The findings revealed that the two groups of apples experienced weight reduction at different levels. Apples placed at cold storage presented a loss of weight between 3.31g and 4.49g; however, apples stored at ambient temperature showed a significant loss of weight between 21.9g and 31.76g.

scholarly journals Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.)

2013 ◽  
Vol 35 (2) ◽  
pp. 657-664 ◽  
Author(s):  
Sylvia Raquel Gomes Moraes ◽  
Francisco André Osama Tanaka ◽  
Nelson Sidnei Massola Júnior
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Colletotrichum Gloeosporioides ◽  
Psidium Guajava ◽  
Mature Stage ◽  
Guava Fruit ◽  
Transmission Electron ◽  
Colonization Process ◽  
Parenchymal Cells ◽  
Appressoria Formation

Anthracnose, caused by Colletotrichum gloeosporioides, produces brown lesions on guava fruits, causing severe losses on postharvest. In this study, the infection and colonization of guava fruits by C. gloeosporioides has been examined using scanning and transmission electron microscopy. Fruits at the physiologically mature stage were inoculated with a 10(5) conidia/mL spore suspension. Afterward, fruits were incubated at 25 °C in a wet chamber for periods of 6, 12, 24, 48, 96 and 120 h to allow examination of the infection and colonization process. Conidia germination and appressoria formation occurred six hours after inoculation (h.a.i). Penetration occurred directly via penetration pegs from appressoria, which penetrated the host cuticle 48 h.a.i. Notably, the appressoria did not produce an appressorial cone surrounding the penetration pore. Infection vesicles were found in epidermal cells 96 h.a.i. The same fungal structures were found in epidermal and parenchymal cells of the host 120 h.a.i. Colonization strategy of C. gloeosporioides on guava fruit was intracellular hemibiotrophic.

scholarly journals The Function of the Gills of Mayfly Nymphs from Different Habitats

1939 ◽  
Vol 16 (3) ◽  
pp. 363-373 ◽  
Author(s):  
C. A. WINGFIELD
Keyword(s):  
Oxygen Consumption ◽  
Oxygen Content ◽  
The Body ◽  
Gaseous Exchange ◽  
Low Oxygen ◽  
Respiratory Mechanism ◽  
Tracheal Gills ◽  
Cloeon Dipterum ◽  
Gill Function ◽  
Oxygen Concentrations

1. The oxygen consumption of normal and gill-less nymphs of the mayflies Baetis sp., Cloeon dipterum and Ephemera vulgata has been measured at various oxygen concentrations. 2. It has been found that over the complete range of oxygen concentrations studied, the tracheal gills do not aid oxygen consumption in Baetis sp. In Cloeon dipterum, at all oxygen concentrations tested, no gaseous exchange takes place through the gills; at low oxygen concentrations, however, the gills function as an accessory respiratory mechanism in ventilating the respiratory surface of the body and so aid oxygen consumption. In Ephemera Vulgata the gills aid oxygen consumption even at high oxygen concentrations. In this species the gills may function both as true respiratory organs and as a ventilating mechanism. 3. It is shown that the differences in gill function can be related to the oxygen content of the habitat of each species.

scholarly journals Isolation of Alcaligenes sp. strain L6 at low oxygen concentrations and degradation of 3-chlorobenzoate via a pathway not involving (chloro)catechols.

1996 ◽  
Vol 62 (7) ◽  
pp. 2427-2434 ◽  
Author(s):  
J Krooneman ◽  
E B Wieringa ◽  
E R Moore ◽  
J Gerritse ◽  
R A Prins ◽  
...  
Keyword(s):  
Low Oxygen ◽  
Oxygen Concentrations
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