TY - JOUR ID - merzlyak1999 AU - Merzlyak, Mark N. AU - Gitelson, Anatoly A. AU - Chivkunova, Olga B. AU - Rakitin, Victor Y. U. TI - Non-destructive optical detection of pigment changes during leaf senescence and fruit ripening UR - http://dx.doi.org/10.1034/j.1399-3054.1999.106119.x DO - 10.1034/j.1399-3054.1999.106119.x T2 - Physiologia Plantarum PY - 1999 SN - 1399-3054 VL - 106 IS - 1 SP - 135-141 AB - Reflectance spectra in the visible and near infra-red range of the spectrum, acquired for maple (Acer platanoides L.), chestnut (Aesculus hippocastanum L.), potato (Solanum tuberosum L.), coleus (Coleus blumei Benth.), leaves and lemon (Citrus limon L.) and apple (Malus domestica Borkh.) fruits were studied. An increase of reflectance between 550 and 740 nm accompanied senescence-induced degradation of chlorophyll (Chl), whereas in the range 400–500 nm it remained low, due to retention of carotenoids (Car). It was found that both leaf senescence and fruit ripening affect the difference between reflectance (R) near 670 and 500 nm (R678-R500), depending on pigment composition. The plant senescing reflectance index in the form (R678-R500)/R750 was found to be sensitive to the Car/Chl ratio, and was used as a quantitative measure of leaf senescence and fruit ripening. The changes in the index were followed during leaf senescence, and natural and ethylene-induced fruit ripening. This novel index can be used for estimating the onset, the stage, relative rates and kinetics of senescence/ripening processes. ER - TY - ELEC ID - idb AU - Henrich, V. AU - Krauss, G. AU - Götze, C. AU - Sandow, C. TI - The IndexDatabase UR - https://www.indexdatabase.de/ CY - Bonn PY - 2011 DA - 2011 ER -