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Nir estimation of rockmelon (Cucumis melo) fruit TDS, in relation to tissue inhomogeneity

journal contribution
posted on 06.12.2017, 00:00 by Robert LongRobert Long, G Rogers, Kerry WalshKerry Walsh, David MidmoreDavid Midmore
The melon fruit is not homogeneous in terms of tissue structure or total dissolved solids (TDS) distribution. This inhomogeneity is expected to impact on near infrared NIR assessments of TDS, with spectral data typically collected from a fraction of the fruit. Spectra were collected from three different areas (the ground spot, an equatorial position and the stylar end) on the intact fruit of two cultivars ('Dubloon' and 'Malibu'). TDS was determined for flesh from both the outer one cm and inner one cm of mesocarp for each sample position. Partial least squares calibrations (783-955nm based on inner mesocarp tissue) were stronger (higher reference population standard deviation to calibration error ratio or SDR values) when based on outer, rather than inner, mesocarp TDS (e.g. SDR 2.56 cf. 1.95, respectively, for 'Dubloon', ground spot). Calibrations on inner mesocarp were stronger for 'Dubloon' than 'Malibu' melons, consistent with a higher correlation between inner and outer tissue TDS (R2 0.92 'Dubloon'; R2 0.59 'Malibu'). SDR values for inner mesocarp TDS were higher for calibrations developed using stylar end and ground spot acquired spectra. The correlation between outer and inner mesocarp TDS was also greater in these positions than in other equatorial positions. The ground spot also has less lenticel development. Future work will consider mesocarp TDS uniformity in terms of cultivar, harvest time and post harvest storage time.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

30

Issue

588

Start Page

357

End Page

361

Number of Pages

5

ISSN

0567-7572

Location

Slovakia

Publisher

Slovenska Polnohospodarska Univerzita v Nitre

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Applied Horticultural Research (Sutherland); Faculty of Arts, Health and Sciences;

Era Eligible

No

Journal

Acta horticulturae.