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1

Control of postharvest decay of apple fruit with Trichoderma virens isolates and induction of defense responses

100%
Bordbar F. T., Etebarian H. R., Sahebani N., Rohani H.
Journal of Plant Protection Research
|
2010
|
tom 50
|
nr 2
146-152
The biocontrol activity of two isolates of Trichoderma virens against blue mould of apple fruits caused by Penicillium expansum and their ability to induce biochemical defense responses in apple tissue were investigated. Apple fruit (Malus domestica) wounds were inoculated with 20μl antagonist suspension (107 conidia/ml) of T. virens and 4 h later with 20 μl of conidial suspension of P. expansum (105 conidia/ml). The apples were then incubated at 20°C for 8 days. Lesion diameters were measured 4 and 8 days after inoculation with the pathogen. Two isolates of T. virens were effective in controlling decay of apple fruits caused by P. expansum. Six days after treatment peroxidase activity increased by more than three-fold in apple treated fruit in combination of antagonist and pathogen, in comparison with in wounded, non-inoculated control tissue. Catalase (CAT) activity increased in inoculated fruits in combination of T. virens and P. expansum in comparison with healthy control at all days and maximum activity level was noted at 6 days after inoculation. The results indicated that T6 and T8 isolates of T. virens caused the increase in β-1,3-glucanase activity that reached maximum levels 4 and 6 days after inoculation with pathogen, respectively. The increase in β-1,3-glucanase activity was triggered by wounding although the level of increase was markedly lower than detected in treated fruits. Phenolic compounds accumulation showed the highest levels 2-4 days after inoculation and then decreased. The ability of T. virens to increase the activity of peroxidase, catalase, β-1,3-glucanase and levels of phenolic compounds may be one of mechanisms responsible for its biocontrol activity.
2
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Peach antioxidant and phenolic activities influenced by the application of 1-methylcyclopropene (1-MCP) at post-harvest

100%
Shah S. T., Sajid M., Khan N. U., Rab A., Amin N. U., Arif M., Haleema B., Saeed S.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2019
|
tom 18
|
nr 2
Early maturing peach (Prunus persica) cultivars can fetch good market value but face a lot of post-harvest problems that lead to the post-harvest losses. The 1-methylcyclopropene (1-MCP) can provide new insights into plant ethylene responses and extend the shelf life and quality of fruits. Therefore, fruits of peach cultivar ‘Early Grand’ were dipped in various concentrations of 1-MCP (0, 0.3, 0.6 and 0.9 µg l–1), stored for 40 days at 8 ±2°C with 50% relative humidity and analyzed the fruits for physicochemical attributes at 10 days interval. The highest concentration of 1-MCP at 0.9 µg l–1 significantly improved the activity of antioxidants, catalase, free radical scavenging assay and total phenols. However, the peach fruits treated with 1MCP at 0.6 µgL–1 was effective in retaining the ascorbic acid, lowering the weight loss and fruit decay. Therefore, peach fruits can be treated with 1-MCP (0.6 µg l–1) solution for prolonging its shelf life up to 40 days under low temperature.
3

Postharvest properties of sweet cherry fruit depending on rootstock and storage conditions

100%
Dziedzic E., Blaszczyk J., Kaczmarczyk E.
Folia Horticulturae
|
2017
|
tom 29
|
nr 2
4
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Postharvest quality of sweet cherry fruits as affected by bioregulators

88%
Kalajdzic J., Milic B., Petres M., Stankov A., Grahovac M., Magazin N., Keserovic Z.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2019
|
tom 18
|
nr 5
During the cold storage of sweet cherry, severe losses can occur due to the water loss, phytopathogenic fungi and physiological disorders. The aim of this research was to assess the effects of treatments with NAA (α-naphthaleneacetic acid), BA (6-benzyladenine), and GA3 (gibberellic acid) on fruit quality at harvest and after 21 days of storage under two regimes, including 0°C, RH (relative humidity) 90% and 3°C, RH 70%, and after additional shelf life exposure. Sweet cherry cultivars – ‘Summit’, ‘Kordia’ and ‘Regina’ – were treated with bioregulators at the end of flowering. NAA significantly increased the fruit weight at harvest compared to the control in all cultivars assessed. BA stimulated the fruit growth in ‘Kordia’ and ‘Regina’, while it was ineffective in ‘Summit’. GA3 caused significant increase in fruit weight by 8.3% in ‘Kordia’ only. Moreover, BA and GA3 induced a higher firmness of fruits at harvest. Weight loss of fruits during storage at 0°C, RH 90%, was increased with NAA and reduced with GA3 in ‘Regina’ only. BA and GA3 reduced the weight loss of sweet cherry fruits stored at 3°C, RH 70%. Bioregulator treatments increased TA (titratable acidity) in fruits at harvest, while the effects on TA during storage were variable depending on the cultivar. ‘Summit’ had the highest sensitivity to storage fruit rot. BA and GA3 decreased the disease occurrence on fruits stored at 0°C in ‘Summit’ and ‘Kordia’.
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