Abstract
Poor rind colour in cv. M7 Navel (Citrus sinensis L. Osbeck) at harvest time severely affects the profits of the growers in Western Australia. The effects of the preharvest spray application of different concentrations (0, 1.25, 2.5, 5.0 and 7.5 mM) of methyl jasmonate (MJ) on the rind colour development and fruit quality of M7 Navel were investigated at 6 or 3 weeks before anticipated harvest (WBAH) during 2015 and 2016. The preharvest spray application of MJ (5.0 or 7.5 mM) resulted in enhanced rind colour, reduced hue angle (ho) angle (55.7, 54.3) as well as increased citrus colour index (CCI) (11.0, 12.0) and total carotenoid levels (35.3, 58.3 mg kg-1) of flavedo, respectively in M7 Navel, during 2015 and 2016. During 2015, comparatively higher levels of total carotenoid (40.4 mg kg-1) were recorded when MJ was applied at 3 WBAH as a single spray. However, the time of MJ application did not influence hue angle (h°) and CCI. In 2015, all the preharvest MJ treatments except (1.25 mM) exhibited reduced fruit firmness. Furthermore, soluble solids concentration (SSC) in the fruit juice was reduced after MJ treatment. All the MJ treatments showed reduced levels of total sugars and organic acids in the juice, during 2015. In conclusion, MJ (5.0 or 7.5 mM) reduced h° but increased the total carotenoids levels and CCI in the flavedo of M7 Navel orange, when applied as a preharvest spray at 3 WBAH
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Claims 9
Claim · model-written summary
Methyl jasmonate at 5.0 or 7.5 mM enhanced M7 Navel rind colour.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- preharvest spray application of MJ (5.0 or 7.5 mM)e0
- Outcome
- rind coloure0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“The preharvest spray application of MJ (5.0 or 7.5 mM) resulted in enhanced rind colour”
t0“M7 Navel orange”
Claim · model-written summary
Methyl jasmonate reduced hue angle to reported values of 55.7 and 54.3.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- MJ (5.0 or 7.5 mM)e0
- Outcome
- hue anglee0
- Direction
- reducede0
- Value
- 55.7, 54.3e0
Not reportedComparator
Verbatim
e0“The preharvest spray application of MJ (5.0 or 7.5 mM) resulted in enhanced rind colour, reduced hue angle (ho) angle (55.7, 54.3)”
t0“M7 Navel orange”
Claim · model-written summary
Methyl jasmonate increased citrus colour index to 11.0 and 12.0.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- MJ (5.0 or 7.5 mM)e1
- Outcome
- citrus colour indexe0
- Direction
- increasede0
- Value
- 11.0, 12.0e0
Not reportedComparator
Verbatim
e0“increased citrus colour index (CCI) (11.0, 12.0)”
e1“The preharvest spray application of MJ (5.0 or 7.5 mM)”
t0“M7 Navel orange”
Claim · model-written summary
Methyl jasmonate increased total flavedo carotenoid levels to 35.3 and 58.3 mg kg-1.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Organ / stage
- flavedoe0
- Treatment
- MJ (5.0 or 7.5 mM)e1
- Outcome
- total carotenoid levelse0
- Direction
- increasede0
- Value
- 35.3, 58.3 mg kg-1e0
Not reportedComparator
Verbatim
e0“increased citrus colour index (CCI) (11.0, 12.0) and total carotenoid levels (35.3, 58.3 mg kg-1) of flavedo”
e1“The preharvest spray application of MJ (5.0 or 7.5 mM)”
t0“M7 Navel orange”
Claim · model-written summary
In 2015, a single methyl jasmonate spray at 3 weeks before anticipated harvest produced higher total carotenoid levels of 40.4 mg kg-1.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- MJ was applied at 3 WBAH as a single spraye0
- Outcome
- total carotenoide0
- Direction
- highere0
- Value
- 40.4 mg kg-1e0
- Qualifier
- During 2015e0
Not reportedComparator
Verbatim
e0“During 2015, comparatively higher levels of total carotenoid (40.4 mg kg-1) were recorded when MJ was applied at 3 WBAH as a single spray.”
t0“M7 Navel orange”
Claim · model-written summary
Methyl jasmonate application timing did not influence hue angle or citrus colour index.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- time of MJ applicatione0
- Outcome
- hue angle (h°) and CCIe0
- Direction
- did not influencee0
Not reportedComparator
Verbatim
e0“the time of MJ application did not influence hue angle (h°) and CCI.”
t0“M7 Navel orange”
Claim · model-written summary
In 2015, all preharvest methyl jasmonate treatments except 1.25 mM reduced fruit firmness.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Treatment
- preharvest MJ treatmentse0
- Outcome
- fruit firmnesse0
- Direction
- reducede0
- Qualifier
- except (1.25 mM)e0
Not reportedComparator
Verbatim
e0“In 2015, all the preharvest MJ treatments except (1.25 mM) exhibited reduced fruit firmness.”
t0“M7 Navel orange”
Claim · model-written summary
Methyl jasmonate reduced fruit juice soluble solids concentration.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Organ / stage
- fruit juicee0
- Treatment
- MJ treatmente0
- Outcome
- soluble solids concentratione0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“soluble solids concentration (SSC) in the fruit juice was reduced after MJ treatment.”
t0“M7 Navel orange”
Claim · model-written summary
All methyl jasmonate treatments reduced juice total sugars and organic acids in 2015.
- Taxon
- oranget0
- Material
- M7 Navelt0
- Organ / stage
- juicee0
- Treatment
- MJ treatmentse0
- Outcome
- total sugars and organic acidse0
- Direction
- reducede0
- Qualifier
- during 2015e0
Not reportedComparator
Verbatim
e0“All the MJ treatments showed reduced levels of total sugars and organic acids in the juice, during 2015.”
t0“M7 Navel orange”
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