Abstract
Postharvest losses remain a major challenge in fruit production systems, affecting both climacteric fruits, such as papaya, and non-climacteric fruits, such as orange. Ultraviolet-C (UV-C) radiation has emerged as a sustainable alternative to chemical fungicides; however, its effectiveness depends on the applied dose and radiation delivery mode. This study investigated the comparative effects of continuous and frequency-modulated UV-C radiation on postharvest disease control and fruit quality on papaya and orange. Two independent experiments were conducted. Experiment 1 evaluated the influence of modulation frequencies (0, 15, 30, and 45 Hz) on disease progression, while Experiment 2 combined the most effective frequencies with different exposure times to define optimal treatment conditions. In papaya, UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²) provided effective control of anthracnose (67% reduction in incidence), while minimizing photothermal damage, with no visible epidermal injuries. In orange, continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²), completely suppressed sour rot development (100%) without visible peel injury. Therefore, the selection of the UV-C radiation application mode is species-specific. Notably, modulation of UV-C irradiation has demonstrated enhanced efficiency in postharvest disease control while reducing epidermal burn. Additionally, the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase. Physicochemical analyses confirmed the maintenance of firmness, acidity, and color stability, indicating the preservation of postharvest quality in both fruits. Overall, modulated UV-C radiation represents a promising non-chemical postharvest technology, enabling efficient disease control while maintaining fruit quality.
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Claims 6
Claim · model-written summary
In papaya, UV-C modulation at 30 Hz/20 s reduced anthracnose incidence by 67%.
- Taxon
- papaya
_-_DPLA_-_55200ec009622d7d42349f3583df310e.jpg?width=60)
Carica papayae0 - Treatment
- UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²)e0
- Outcome
- control of anthracnosee0
- Direction
- reductione0
- Value
- 67%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_-_DPLA_-_55200ec009622d7d42349f3583df310e.jpg?width=500)
Verbatim
e0“In papaya, UV-C modulation at 30 Hz/20 s (0.44 kJ m⁻²) provided effective control of anthracnose (67% reduction in incidence)”
Claim · model-written summary
In orange, continuous UV-C for 30 s completely suppressed sour rot development.
- Taxon
- orangee0
- Treatment
- continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²)e0
- Outcome
- sour rot developmente0
- Direction
- suppressede0
- Value
- 100%e0
Not reportedComparator
Verbatim
e0“In orange, continuous UV-C radiation (0 Hz) applied for 30 s (1.99 kJ m⁻²), completely suppressed sour rot development (100%)”
Claim · model-written summary
Treatments increased activities of phenylalanine ammonia-lyase and polyphenoloxidase in the fruits.
- Taxon
- papaya and oranget0
- Treatment
- the treatmentse0
- Gene
- phenylalanine ammonia-lyase, polyphenoloxidasee0
- Outcome
- activitiese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase”
t0“papaya and orange fruits”
Claim · model-written summary
Treatments increased activities of peroxidase and catalase in the fruits.
- Taxon
- papaya and oranget0
- Treatment
- the treatmentse0
- Gene
- peroxidase, and catalasee0
- Outcome
- activitiese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“the treatments stimulated defense responses, as evidenced by increased activities of phenylalanine ammonia-lyase, polyphenoloxidase, peroxidase, and catalase”
t0“papaya and orange fruits”
Claim · model-written summary
Modulation of UV-C irradiation enhanced efficiency of postharvest disease control while reducing epidermal burn.
- Taxon
- papaya and oranget0
- Treatment
- modulation of UV-C irradiatione0
- Outcome
- efficiency in postharvest disease controle0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“modulation of UV-C irradiation has demonstrated enhanced efficiency in postharvest disease control while reducing epidermal burn”
t0“papaya and orange fruits”
Claim · model-written summary
Firmness, acidity and color stability were maintained in both fruits.
Verbatim
e0“Physicochemical analyses confirmed the maintenance of firmness, acidity, and color stability”
t0“papaya and orange fruits”
The same questions in other papers
uv · disease · Carica papaya (papaya)Results agree
1 paper in the same direction as this paper
- positive
radiation · disease · Citrus sinensis (sweet orange)Results agree
2 papers in the same direction as this paper
- positive
- positive
uv · disease · Citrus sinensis (sweet orange)Results agree
4 papers in the same direction as this paper
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.