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Can visual reflectance indicies be related to ripeness of banana fruit

journal contribution
posted on 2017-12-06, 00:00 authored by Umesh Acharya, Kerry WalshKerry Walsh, Phul Subedi, W McGlasson
Bananas (Musa sp. [AAA group, Cavendish subgroup] 'Williams') grown under paper bunch covers appear riper, being a lighter shade of green at maturity, than fruit grown under plastic bunch covers. However, such fruit ripen more slowly than fruit under plastic, in terms of respiration rate and ethylene release, based on measurements of individual fingers enclosed in containers at 20°C and ventilated with humidified air containing 300 μl.L-1 propylene for 36 h. There was no significant difference in soluble solids concentrations between the two lines of fruit after seven days of ripening. The objective of this study was to determine whether reflectance spectra can be correlated with physiological ripeness to monitor ripening of bananas non-destructively. Colorimetric readings showed that the initial visible differences in skin colour between the lines largely disappeared by day 5 of ripening. A number of pigment indices were calculated using these spectra, targeting chlorophyll, carotenoids and xanthophylls. Some of these measures were clearly lower in pale bananas grown under paper bunch covers but converged after day 5 of ripening. The most promising measurement for assessing ripeness stage was the chlorophyll index (calculated from the second derivative of absorbance spectra as A800/A700-1), with a consistent value at harvest, despite growth condition, and increase with fruit ripening.

History

Volume

1088

Start Page

67

End Page

72

Number of Pages

6

ISSN

0567-7572

Location

Belgium

Publisher

International Society for Horticultural Science

Language

en-aus

Peer Reviewed

  • Yes

Open Access

  • No

External Author Affiliations

Centre for Plant and Water Science; School of Medical and Applied Sciences (2013- ); Southeast Asia Symposium on Quality Management in Postharvest Systems (2nd : 2013 : Vientiane); University of Western Sydney;

Era Eligible

  • Yes

Journal

Acta horticulturae.

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