POSTHARVEST APPLICATION OF THIABENDAZOLE REDUCES CHILLING INJURY OF CITRUS FRUIT

2013 ◽  
pp. 119-125 ◽  
Author(s):  
J. Hordijk ◽  
P.J.R. Cronjé ◽  
U.L. Opara
HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 520b-520
Author(s):  
Huating Dou ◽  
Peter D. Petracek ◽  
Craig Davis

Navel oranges are reportedly susceptible to postharvest peel disorders, including chilling injury and aging/stem end rind breakdown. These and other physiological disorders are sometimes given the common term “navel rind breakdown.” California citrus industry reports on recent incidences of navel rind breakdown suggested that some instances of this disorder were similar to “postharvest pitting,” a disorder that we have observed in a number of Florida citrus varieties. Thus, we decided to define the morphology and etiology of pitting of `Washington' navel orange (Citrus sinensis L.) peel. The disorder was characterized by the collapse of clusters of oil glands and was stimulated by wax application and high temperature (≥13 °C) storage. Internal ethanol levels of waxed fruit stored at high temperature (13 or 21 °C) were significantly higher among fruit that developed pitting than those that did not. The pitting observed in these studies is comparable to previously observed navel orange disorders that have occurred without known cause. Navel orange pitting is morphologically and etiologically distinct from chilling injury and aging/stem end rind breakdown, but is similar to postharvest pitting of Florida citrus fruit.


2005 ◽  
pp. 831-842 ◽  
Author(s):  
M.T. Lafuente ◽  
L. Zacarias ◽  
J.M. Sala ◽  
M.T. Sánchez-Ballesta ◽  
M.J. Gosalbes ◽  
...  
Keyword(s):  

2013 ◽  
pp. 103-110
Author(s):  
N. Mathaba ◽  
I. Bertling ◽  
J.P. Bower

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 496B-496
Author(s):  
Peter D. Petracek ◽  
Craig Davis

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.


2016 ◽  
Vol 5 (2) ◽  
pp. 23 ◽  
Author(s):  
Joyce Chepngeno ◽  
Willis O Owino ◽  
John Kinyuru ◽  
Ngoni Nenguwo

<p>Precooling and postharvest application of calcium chloride (CaCl<sub>2</sub>) on produce has positive effects in maintaining the produce quality during storage. However, there is variation in the response of the produce to different CaCl<sub>2 </sub>concentrations<sub>. </sub>As a result, there is need to establish optimal concentrations of calcium chloride that can extend postharvest life of targeted produce. Fresh good quality produce (tomatoes, carrots, courgettes and African eggplants) of uniform size and maturity were harvested and sampled into four portions. One was a control, hydrocooled with water only at 2±1 <sup>0</sup>C and the others were hydrocooled with water containing CaCl<sub>2</sub> at 0.5%, 1.0% and 1.5%. After hydrocooling, tomatoes, African eggplants and courgettes were stored at 10 <sup>0</sup>C, while carrots were stored at 7 <sup>0</sup>C, all at 95% constant relative humidity, and sampled every two days for quality assessment. Weight loss, chilling injury, vitamin c and beta-carotene loss were reduced by application of calcium chloride. Titratable acidity decrease and increase in total soluble solids and specific sugars was also slowed by application of CaCl<sub>2</sub>.</p>


2021 ◽  
Vol 287 ◽  
pp. 110264
Author(s):  
Lu-Lu Chen ◽  
Wei Shan ◽  
Dan-Ling Cai ◽  
Jian-Ye Chen ◽  
Wang-Jin Lu ◽  
...  

1999 ◽  
Vol 124 (2) ◽  
pp. 184-188 ◽  
Author(s):  
Samir Droby ◽  
Ron Porat ◽  
Lea Cohen ◽  
Batia Weiss ◽  
Boris Shapiro ◽  
...  

Jasmonic acid (JA) and methyl jasmonate (MJ), collectively referred to as jasmonates, are naturally occurring plant growth regulators involved in various aspects of plant development and responses to biotic and abiotic stresses. In this study, we found that postharvest application of jasmonates reduced decay caused by the green mold Penicillium digitatum (Pers.: Fr.) Sacc. after either natural or artificial inoculation of grapefruit (Citrus paradisi `Marsh Seedless'). These treatments also effectively reduced chilling injury incidence after cold storage. The most effective concentration of jasmonates for reducing decay in cold-stored fruit or after artificial inoculation of wounded fruit at 24 °C was 10 μmol·L-1. Higher and lower jasmonate concentrations were less effective at both temperatures. MJ at 10 μmol·L-1 also most effectively reduced the percentage of fruit displaying chilling injury symptoms after 6 weeks of storage at 2 °C and 4 additional d at 20 °C. When tested in vitro, neither JA nor MJ had any direct antifungal effect on P. digitatum spore germination or germ tube elongation. Therefore, it is suggested that jasmonates probably reduced green mold decay in grapefruit indirectly by enhancing the natural resistance of the fruit to P. digitatum at high and low temperatures.


1994 ◽  
Vol 119 (5) ◽  
pp. 983-986 ◽  
Author(s):  
E. Cohen ◽  
B. Shapiro ◽  
Y. Shalom ◽  
J.D. Klein

Water loss was found to be a nondestructive indicator before visible symptoms of chilling injury (CI) in cold-stored grapefruit (Citrus paradisi Macf.) and lemon (C. limon L. Burm. f.). The water-loss rate increased significantly after removing the fruit from cold storage and holding at 20C. Scanning electron microscopy revealed large cracks around the stomata. Changes in electrical conductivity of the flavedo tissues, total electrolyte leakage, and K+ or Ca2+ leakage were all inadequate predictors of CI, appearing only after CI was evident.


1995 ◽  
Vol 5 (1-2) ◽  
pp. 119-127 ◽  
Author(s):  
V. Rodov ◽  
S. Ben-Yehoshua ◽  
R. Albagli ◽  
D.Q. Fang

Foods ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 646 ◽  
Author(s):  
Manish Kumar Patel ◽  
Dalia Maurer ◽  
Oleg Feygenberg ◽  
Amos Ovadia ◽  
Yigal Elad ◽  
...  

More than 40% of harvested fruit is lost, largely due to decay. In parallel, restrictions on postharvest fungicides call for eco-friendly alternatives. Fruit’s natural resistance depends mainly on flavonoids and anthocyanins—which have antioxidant and antifungal activity—synthesized from the phenylpropanoid pathway with phenylalanine as a precursor. We hypothesized that phenylalanine could induce fruit’s natural defense response and tolerance to fungal pathogens. The postharvest application of phenylalanine to mango and avocado fruit reduced anthracnose and stem-end rot caused by Colletotrichum gloeosporioides and Lasiodiplodia theobromae, respectively. The postharvest application of phenylalanine to citrus fruit reduced green mold caused by Penicillium digitatum. The optimal phenylalanine concentrations for postharvest application were 6 mM for citrus fruits and 8 mM for mangoes and avocadoes. The preharvest application of phenylalanine to strawberries, mangoes, and citrus fruits also reduced postharvest decay. Interestingly, citrus fruit resistance to P. digitatum inoculated immediately after phenylalanine application was not improved, whereas inoculation performed 2 days after phenylalanine treatment induced the defense response. Five hours after the treatment, no phenylalanine residue was detected on/in the fruit, probably due to rapid phenylalanine metabolism. Additionally, in vitro testing showed no inhibitory effect of phenylalanine on conidial germination. Altogether, we characterized a new inducer of the fruit defense response—phenylalanine. Preharvest or postharvest application to fruit led to the inhibition of fungal pathogen-induced postharvest decay, suggesting that the application of phenylalanine could become an eco-friendly and healthy alternative to fungicides.


Sign in / Sign up

Export Citation Format

Share Document