Abstract
Developing fruits of local tomato cultivar ‘Rajitha’ were subjected to different preharvest calcium treatments in order to determine an effective means of extending the keeping quality of the commodity. Treatments were conducted with two calcium concentrations (3% and 5% w/v). There were two spraying protocols; single-application on fruit at 7 days after full bloom (DAFB) and multiple- application viz. weekly spraying starting from 7 DAFB until harvesting. Fruits were harvested at turning stage of colour development and allowed to reach red ripe stage under ambient conditions. Observations were made on the shelf life, titratable acidity (TA), total soluble solids (TSS) content, total calcium content in the outer pericarp and % weight loss during storage. Effect of calcium chloride treatment on susceptibility to fungal diseases was tested on fruits harvested at the ‘turning stage’ on wounded and non-wounded tissues. Rot development with respect to time was tested for both natural disease development and under artificial inoculation with fungal species isolated from tomato fruits. Calcium chloride treatment resulted in a 2.3 to 3.8-fold extension of shelf life of fruits compared to non-treated ones. Calcium treated fruits also exhibited a significantly higher firmness, total calcium content in the outer pericarp and TSS content but significantly lower fresh weight at harvest and a greater weight loss during storage under ambient temperature (27 ±2 0C). Calcium treatment has no consistent relationship with the % TA of fruit. Aspergillus niger and Rhizopus stolonifer were identified as the main postharvest fungal pathogens in tomato. Disease severity was less in Ca2+ treated fruits and the significance of this effect varied between pathogenic fungal species. Irrespective of the Ca2+ treatment, wounded fruits exhibited higher disease severity under natural conditions and also upon artificial inoculation. The extended shelf life in calcium-treated tomato appears to be through higher retention of firmness and retardation of skin colour development. Ceylon Journal of Science (Bio. Sci.) 44 (1) : 55-60, 2015
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Claims 10
Claim · model-written summary
Calcium chloride extended tomato fruit shelf life 2.3 to 3.8-fold versus untreated fruit.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- Calcium chloride treatmente0
- Outcome
- shelf life of fruitse0
- Direction
- extensione0
- Value
- 2.3 to 3.8-folde0
- Comparator
- non-treated onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium chloride treatment resulted in a 2.3 to 3.8-fold extension of shelf life of fruits compared to non-treated ones”
t0“tomato”
Claim · model-written summary
Calcium-treated tomato fruits had higher firmness, outer pericarp calcium and TSS.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Calcium treatede0
- Outcome
- firmness, total calcium content in the outer pericarp and TSS contente0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium treated fruits also exhibited a significantly higher firmness, total calcium content in the outer pericarp and TSS content”
t0“tomato”
Claim · model-written summary
Calcium-treated tomato fruits had lower fresh weight at harvest.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Calciume1
- Outcome
- fresh weight at harveste0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significantly lower fresh weight at harvest and a greater weight loss during storage under ambient temperature (27 ±2 0C)”
e1“Calcium treated fruits also exhibited a significantly higher firmness”
t0“tomato”
Claim · model-written summary
Calcium-treated tomato fruits had greater weight loss during ambient storage.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Calcium treatede0
- Outcome
- weight loss during storagee0
- Direction
- greatere0
- Setting
- ambient temperature (27 ±2 0C)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium treated fruits also exhibited a significantly higher firmness, total calcium content in the outer pericarp and TSS content but significantly lower fresh weight at harvest and a greater weight loss during storage under ambient temperature (27 ±2 0C)”
t0“tomato”
Claim · model-written summary
Calcium treatment had no consistent relationship with tomato fruit titratable acidity.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Calcium treatmente0
- Outcome
- % TA of fruite0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Calcium treatment has no consistent relationship with the % TA of fruit”
t0“tomato”
Claim · model-written summary
Aspergillus niger was identified as a principal postharvest tomato pathogen.
- Taxon
- tomatoSolanum lycopersicume0
- Interactor
- Aspergillus niger
Aspergillus nigere0pathogen - Outcome
- main postharvest fungal pathogens in tomatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aspergillus niger and Rhizopus stolonifer were identified as the main postharvest fungal pathogens in tomato”
Claim · model-written summary
Rhizopus stolonifer was identified as a principal postharvest tomato pathogen.
- Taxon
- tomatoSolanum lycopersicume0
- Interactor
- Rhizopus stolonifer
Rhizopus stolonifere0pathogen - Outcome
- main postharvest fungal pathogens in tomatoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Aspergillus niger and Rhizopus stolonifer were identified as the main postharvest fungal pathogens in tomato”
Claim · model-written summary
Disease severity was lower in calcium-treated tomato fruit, with effect significance varying by fungal species.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- Ca2+ treatede0
- Outcome
- Disease severitye0
- Direction
- lesse0
- Qualifier
- significance of this effect varied between pathogenic fungal speciese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease severity was less in Ca2+ treated fruits and the significance of this effect varied between pathogenic fungal species”
t0“tomato”
Claim · model-written summary
Wounded tomato fruits had greater disease severity under natural conditions and artificial inoculation, regardless of calcium treatment.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- wounded fruitse0
- Outcome
- disease severitye0
- Direction
- highere0
- Qualifier
- Irrespective of the Ca2+ treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrespective of the Ca2+ treatment, wounded fruits exhibited higher disease severity under natural conditions and also upon artificial inoculation”
t0“tomato”
Claim · model-written summary
Authors attribute longer calcium-treated tomato shelf life to firmness retention and delayed skin coloration.
- Taxon
- tomatoSolanum lycopersicume0
- Treatment
- calcium-treatede0
- Outcome
- extended shelf lifee0
- Qualifier
- higher retention of firmness and retardation of skin colour developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extended shelf life in calcium-treated tomato appears to be through higher retention of firmness and retardation of skin colour development”
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See all 9 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.