Linking tissue damage to hyperspectral reflectance for non-invasive monitoring of apple fruit in orchardsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 апреля 2021 г.
Аннотация:Reflected light carries ample information about the biochemical composition, tissue architecture, and physiological condition of plants. Recent technical progress has paved the way foraffordable imaging hyperspectrometers (IH) providing spatially resolved spectral information onplants on different levels, from individual plant organs to communities. The extraction of sensibleinformation from hyperspectral images is difficult due to inherent complexity of plant tissue andcanopy optics, especially when recorded under ambient sunlight. We report on the changes in hyperspectral reflectance accompanying the accumulation of anthocyanins in healthy apple (cultivars Ligol,Gala, Golden Delicious) fruits as well as in fruits affected by pigment breakdown during sunscalddevelopment and phytopathogen attacks. The measurements made outdoors with a snapshot IHwere compared with traditional “point-type” reflectance measured with a spectrophotometer undercontrolled illumination conditions. The spectra captured by the IH were suitable for processingusing the approaches previously developed for “point-type” apple fruit and leaf reflectance spectra.The validity of this approach was tested by constructing a novel index mBRI (modified browningreflectance index) for detection of tissue damages on the background of the anthocyanin absorption.The index was suggested in the form of mBRI = (1/R640−1 + 1/R800) − 1/R678. Difficulties of theinterpretation of fruit hyperspectral reflectance images recorded in situ are discussed with possibleimplications for plant physiology and precision horticulture practices.