UV-C treatment controls brown rot in postharvest nectarine by regulating ROS metabolism and anthocyanin synthesis

Applying low doses of ultraviolet light (254 nm, W-C) reduces the incidence of brown rot of (Monilinia fructicola) peaches, green mold (Penicillium digitatum) of tangerines, and Rhizopus soft rot (Rhizopus stolonifer) of tomatoes and sweetpotatoes resulting from field infection and artificial inoculation. In most studies, applying postharvest fungicide (PF) was better than W-C treatment. In this study, the effectiveness of combining a biocontrol agent, Debaryomyces hansenii (BC), with low UV-C dose for postharvest disease control was investigated. When these commodities were treated with BC 3 days after W-C treatment, the reduction of storage rots was more effective than when UV-C was used alone. For example, the percent brown rot infection of artificially inoculated Elberta peaches 36 hours after inoculation of the nontreated control, peaches treated with UV-C, BC, W-C + BC, and benlate were 100%, 55%, 67%, 12%, and 12%, respectively. The efficacy of W-C + BC was similar to when PF was used alone, indicating that an integration of UV-C treatment and BC can reduce storage rot to the levels of commercial PF treatment.

Download Full-text

355 Effect of UV-C on Ripening and Postharvest Quality of Peaches

HortScience ◽

10.21273/hortsci.34.3.504d ◽

1999 ◽

Vol 34 (3) ◽

pp. 504D-504 ◽

Cited By ~ 2

Author(s):

Robert C. Ebel ◽

Floyd M. Woods ◽

Dave Himelrick

Keyword(s):

Fruit Quality ◽

Skin Color ◽

Storage Temperature ◽

Brown Rot ◽

Soluble Solids ◽

Postharvest Quality ◽

Before And After ◽

And Storage ◽

Uv C

Brown rot of peaches is one of the most devastating diseases that can occur before and after harvest. There has been extensive research that has shown that ultraviolet light (UV-C) kills the fungus that causes brown rot. However, it is has not been determined whether UV-C will also change ripening and fruit quality. We applied UV-C to `Loring' peaches that were harvested 10 days before normal harvest. We intentionally picked the fruit early because we wanted to make sure the fruit had not entered the climacteric. The fruit were treated with UV-C and ethylene, skin color, firmness, and soluble solids were measured. We also held fruit at three storage temperatures to determine whether there may be an interaction between UV-C treatment and storage temperature. Ethylene was slightly higher for UV-C treated fruit at 70 °F (20 °C) and 55 °F (12 °C), but not at 40 °F (4 °C). However, there was very little effect on firmness and soluble solids. There was a slight delay in development of red blush. UV-C had little effect on ripening and peach fruit quality.

Download Full-text

RESPONSE OF UV-C LIGHT ON THE CONTROL OF BROWN ROT ON SEVERAL PEACH VARIETIES

HortScience ◽

10.21273/hortsci.29.7.735a ◽

1994 ◽

Vol 29 (7) ◽

pp. 735a-735

Author(s):

C. Stevens ◽

L. P. Pusey ◽

V.A. Khan ◽

J.Y. Lu ◽

C.L. Wilson ◽

...

Keyword(s):

Synergistic Effect ◽

Ultraviolet Light ◽

Low Dose ◽

Brown Rot ◽

Light Irradiation ◽

Ultraviolet Light Irradiation ◽

Rot Disease ◽

Uv C

Flavorcrest, Camden. C. L. Wilson, Loring, Elberta, Summergold and Harken peach varieties were inoculated and naturally infected with Monilinia fructicolo after ultraviolet light irradiation (W-C 254nm) showed increased resistance to brown rot disease. Although dosages ranged from 0 to 20 KJ/m2. 7.5 KJ/m2 was considered the most effective for the peach varieties tested. Pretreatment of peaches by field spraying or dipping into a benomyl fungicide showed no significant differences between non-treated and UV-C treated peaches. However. a combination of a low dose of benomyl (.15g/L) 3 days following UV-C treatment showed a synergistic effect on brown rot reduction when compared to Peaches treated with UV-C alone and a greater reduction of brow rot than benomyl control.

Download Full-text

UV-C EFFECT AND ALTERNATIVE TREATMENTS FOR POSTHARVEST CONTROL OF BROWN ROT IN PEACHES

Acta Horticulturae ◽

10.17660/actahortic.2014.1053.29 ◽

2014 ◽

pp. 265-272 ◽

Cited By ~ 2

Author(s):

F.V. Nascimento ◽

R.J. Bender ◽

R.M. Valdebenito-Sanhueza

Keyword(s):

Brown Rot ◽

Alternative Treatments ◽

Uv C ◽

Postharvest Control

Download Full-text

PLANT HORMESIS INDUCED BY ULTRAVIOLET LIGHT-C FOR INDUCING RESISTANCE OF BROWN ROT OF PEACHES

HortScience ◽

10.21273/hortsci.27.11.1168h ◽

1992 ◽

Vol 27 (11) ◽

pp. 1168h-1169

Author(s):

C. Stevens ◽

P. L. Pusey ◽

V. A. Khan ◽

J. Y. Lu ◽

C. L. Wilson ◽

...

Keyword(s):

Antifungal Activity ◽

Ultraviolet Light ◽

Prunus Persica ◽

Latent Infection ◽

Negative Relationship ◽

Brown Rot ◽

Host Responses ◽

Pal Activity ◽

Lyase Activity ◽

Uv C

Low hormetic doses of ultraviolet light (UV-C) stress on exposed peaches (Prunus persica). reduced brown rot resulting from field and artificial inoculation from Monilinia fructicola. To test the hypothesis that UV-C induced resistance through host responses the following tests involving biochemical changes (phenlyalanine ammonia-lyase activity (PAL) and ethylene production (EP)), bioassay of antifungal activity of tissue extracts to the fungus, and latent infection of rot free peaches previously treated with and without UV-C were determined. Exposure of peaches to UV-C dose of 7.5×104 ergs/mm2 promoted an increase in PAL and EP compared to the control. As the PAL activity increased, percent storage rots decreased. Antifungal activity to the fungal conidia in UV-C treated peach extract showed that the percent conidia germination was reduced 3 folds. Preharvest infection of brown rot which indicated latent infection was significantly reduced. To test for the germicidal effect of UV-C on M. fructicola on the surface of peaches, an artificial epiphytic population of the fungus was deposited on the peaches. A negative relationship between UV-C dose of 1.3 to 40×104 ergs /mm2, colony forming units and number of decaying brown rot lesions were found.

Download Full-text

THE EFFECT OF ULTRAVIOLET LIGHT ON CONTROLLING POSTHARVEST ROTS ON FRUITS

HortScience ◽

10.21273/hortsci.26.5.495e ◽

1991 ◽

Vol 26 (5) ◽

pp. 495e-495

Author(s):

C. Stevens ◽

C. L. Wilson ◽

J. Y. Lu ◽

V. A. Khan ◽

E. Chalutz ◽

...

Keyword(s):

Ultraviolet Light ◽

Brown Rot ◽

Geotrichum Candidum ◽

Monilinia Fructicola ◽

Low Doses ◽

Citrus Fruits ◽

Green Mold ◽

Bitter Rot ◽

Storage Rots ◽

Uv C

Low doses of ultraviolet light (254nm UV–C) irradiation reduced postharvest rots of pome, stone and citrus fruits. Brown rot (Monilinia fructicola) of `Elberta' and `Loring' peaches was significantly reduced by UV–C. Alternaria rot (Alternaria spp.) and bitter rot (Colletotrichum spp.) the principal storage rots of `Golden Delicious apples showed significant reduction following UV–C treatment. Further application of UV–C was effective in controlling green mold rot (Penicillium digitatum) of `Dancy' Tangerines and `Marsh Seedless' grapefruits, stem end rot (Alternaria citri), as well as sour rot (Geotrichum candidum) of `Dancy' tangerines after irradiation.

Download Full-text