Comparison of the Non-Invasive Monitoring of Fresh-Cut Lettuce Condition with Imaging ReflectanceHyperspectrometer and Imaging PAM-Fluorimeterстатья
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Дата последнего поиска статьи во внешних источниках: 15 декабря 2021 г.
Аннотация:We compared two approaches to non-invasive proximal sensing of the early changes infresh-cut lettuce leaf quality: hyperspectral imaging and imaging of variable chlorophyll fluorescencecontained in the leaves. The estimations made by the imaging techniques were confronted with thequality assessments made by traditional biochemical assays (i.e., relative water content and foliarpigment (chlorophyll and carotenoid) composition. The hyperspectral imaging-based approachprovided the highest sensitivity to the decline of fresh-cut lettuce leaf quality taking place within24 h from cutting. Using of the imaging pulse-amplitude modulated PAM chlorophyll fluorometerwas complicated by (i) weak correlation of the spatial distribution pattern of the Qy parameterwith the actual physiological condition of the plant object and (ii) its high degree of heterogeneity.Accordingly, the imaging PAM-based approach was sensitive only to the manifestations of leafquality degradation at advanced stages of the process. Sealing the leaves in polyethylene bags sloweddown the leaf quality degradation at the initial stages (<three days) but promoted its rate at moreadvanced stages, likely due to build-up of ethylene in the bags. An approach was developed to theprocessing of hyperspectral data for non-invasive monitoring of the lettuce leaves with a potentialfor implementation in greenhouses and packing lines.