The Influence of Gibberellic Acid (GA) on Postharvest Pitting of Citrus

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 520a-520
Author(s):  
Peter D. Petracek ◽  
Huating Dou ◽  
Ed Stover
Keyword(s):  
Gas Permeability ◽  
Consumer Acceptance ◽  
Oil Glands ◽  
Citrus Peel ◽  
Early Season ◽  
Low Temperature Storage ◽  
High Temperature Storage ◽  
Postharvest Handling ◽  
Temperature Storage

Postharvest pitting is a citrus peel disorder that is characterized by the physiological breakdown of oil glands and is caused by high temperature storage waxed fruit. Pitting can be controlled by low temperature storage (>10 °C) or application of waxes with high gas permeability. However, refrigeration is costly and often difficult to implement while waxes with higher gas permeabilities have gloss values that are considered to be insufficient for consumer acceptance. Consequently, packers would like to control or predict pitting incidence prior to postharvest stress. Pitting incidence within a grove can vary dramatically within a season despite comparable postharvest handling. Thus, peel susceptibility may be not only variable, but alterable. Peel physiology is readily altered by early-season application of GA, a method currently used to retard peel maturation. Since the influence of GA on postharvest pitting is not known, we examined the effect of early-season foliar-applications of GA on peel quality of `Fallglo' tangerines and white grapefruit. Fruit were harvested throughout the season, washed, coated with shellac-based wax, and stored at 21 °C and 93% RH. GA applied with a silicone surfactant retarded peel maturation as indicated by greener, firmer peels. Pitting incidence was typically less for GA-treated fruit during the initial days of storage. However, GA suppression of pitting did not always persist throughout storage. GA did not affect internal levels of O2, CO2, ethanol, or acetaldehyde or weight loss. While the effectiveness of GA was not consistent, the results suggest that GA application strategies could be developed to suppress pitting. Also, GA treatments may help define factors that determine fruit susceptibility to postharvest pitting.

A Minor Change in Sample Preparation Leads to Unexpected Qualification Fails During High Temperature Storage Stress Test

2020 ◽  
Author(s):  
Klaus Peter Tschernay ◽  
Thomas Haber
Keyword(s):  
High Temperature ◽  
Sample Preparation ◽  
Supply Chains ◽  
Division Of Labor ◽  
Failure Modes ◽  
Stress Test ◽  
High Temperature Storage ◽  
A Minor ◽  
Temperature Storage

Abstract In today’s supply chains based on complex division of labor qualification plans must be executed at various levels of semifinished products. This study shows how a supporting process, assumed to be uncritical in terms of the qualification scope for a bare silicon die, is responsible for qualification fails. Although such failures are not relevant for the quality of the final product careful and thorough analysis is required to invalidate such failure modes.

scholarly journals Study on Changes of Textural and Biochemical Properties of Tuna during Ultra-Low Temperature Storage

2016 ◽  
Vol 6 (2) ◽  
pp. 51 ◽  
Author(s):  
Yu-ying PAN ◽  
Xiao-hua QIU ◽  
Jin-sheng YANG
Keyword(s):  
Soluble Protein ◽  
Storage Time ◽  
Storage Temperature ◽  
Frozen Storage ◽  
Biochemical Properties ◽  
Texture Profile ◽  
Low Temperature Storage ◽  
Different Temperatures ◽  
Temperature Storage

<p class="1Body">The effect of TPA and biochemical properties of Yellow Tuna during frozen storage at different temperatures(-18°C, -25°C, -35°C, -45°C<em>, </em>-55°C<em>, </em>-65°C) were studied by measuring the textural characteristics (the hardness, Springiness) salt-solubility of myofibrillar proteins, Ca<sup>2+</sup>ATPase activities. The results indicated that the hardness, springiness, actomyosin salt-solubility, Ca<sup>2+</sup>ATPase activities decreased during the process of frozen storage. Meanwhile, the frozen stored temperature showed great effect on the freezing denaturation of protein (P &lt; 0.05). For the same longer of the storage time, the lower frozen temperature, the less extent of freeze denaturation; Stored in -18°C for three months, the content of Salt soluble protein reduced to zero; Stored in -25°C for 120 <em>days</em>, the content of salt soluble protein also reduced to zero; But stored in -55°C and -65°C, the change is very little. Ca<sup>2+</sup>ATPase activities also reduced to zero after stored in -18°C and -25°C for three months. But stored in -55°C and -65°C, there is no obvious change. Moreover, there is a Positive relationship between the change of texture profile and the content of Salt soluble protein, the lower the storage temperature, the less of the change of texture profile. Therefore, when it is stored in -55°C, the quality of Yellow Tuna can be maintained to the maximum extent within six months.</p>

scholarly journals The Morphology of Postharvest Pitting of White Grapefruit

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 496B-496
Author(s):  
Peter D. Petracek ◽  
Craig Davis
Keyword(s):  
Chilling Injury ◽  
Citrus Fruit ◽  
Epidermal Cells ◽  
Physical Damage ◽  
Oil Glands ◽  
Parenchyma Cells ◽  
High Temperature Storage ◽  
Grapefruit Peel ◽  
Primary Damage ◽  
Temperature Storage

Postharvest pitting of citrus fruit is a recently defined peel disorder that is caused by high-temperature storage (>10°C) of waxed fruit. We examined the anatomy of pitted white grapefruit peel to improve our understanding of this disorder and assist in its diagnosis. Scanning, light, and transmission micrographs showed that postharvest pitting is characterized by the collapse of oil glands. Cells enveloping the oil glands are the cells of primary damage. Oil gland rupture may occur anywhere around the oil gland, but often occurs in regions farthest from the epidermal cells. Adjacent parenchyma cells are damaged as the oil spreads. Epidermal and hypodermal cells are often damaged during severe oil gland collapse. In contrast, chilling injury is characterized by the collapse of epidermal and hypodermal cells. Oil glands are affected only in severe cases of chilling injury. Oleocellosis (oil spotting) is often characterized by the collapse of epidermal and hypodermal cells, but cells enveloping the oil gland are typically not damaged. Physical damage is characterized by damage of epidermal cells, a wound periderm, and presence of secondary pathogens.

scholarly journals Biological quality of Tetrastichus howardi (Hym.: Eulophidae) reared with Tenebrio molitor (Col.: Tenebrionidae) pupae after storage at low temperatures for different periods

2018 ◽  
Author(s):  
Elison Floriano Tiago ◽  
Fabrício Fagundes Pereira ◽  
Samir Oliveira Kassab ◽  
Rogério Hidalgo Barbosa ◽  
Carlos R Garcia Cardoso ◽  
...  
Keyword(s):  
Biological Control ◽  
Low Temperatures ◽  
Tenebrio Molitor ◽  
Biological Pest Control ◽  
Control Programs ◽  
Low Temperature Storage ◽  
Large Numbers ◽  
Emergence Percentage ◽  
Temperature Storage

Introduction: The endoparasitoid Tetrastichus howardi (Olliff, 1893) (Hymenoptera: Eulophidae) can be reared with the alternative host Tenebrio molitor (Linnaeus, 1758) (Coleoptera: Tenebrionidae). Host storage at low temperatures can regulate parasitoid production and demand in biological control programs. Material and Methods: The life-cycle (egg-adult), parasitism and emergence percentage, number of parasitoids emerged per host pupae, sex ratio and longevity of the T. howardi offspring per T. molitor pupa were evaluated after low temperature storage of this host for different periods and its immature (pupae) in T. molitor pupae for five periods at 10.3 ºC. Tenebrio molitor pupae stored at 0.5 ± 0.09 °C and 2.7 ± 0.11 °C for 10 and 20 days, respectively, were adequate to produce T. howardi. Results: The biological characteristics of this parasitoid were better with T. molitor pupae stored at 0.5 ± 0.09 °C and 2.7 ± 0.11 °C for 10 and 20 days. Tetrastichus howardi immature (pupae) can be stored in T. molitor pupae for 10, 20, 30, 60 and 90 days at 10.3 ºC, preferably in pupae of this host for 10 days to produce these adults of this parasitoid for biological control programs. Discussion: These results contribute to overcoming one of the difficulties encountered in the massive production of parasitoids which is to obtain large numbers of suitable hosts when they are needed. Therefore, the possibility of conserving T. molitor pupae to rear T. howardi will be useful to use this natural enemy in biological pest control programs. Keywords: Biological control, Cold storage, Parasitoids, Progeny.

Sign in / Sign up

Export Citation Format

Share Document