Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring
Decreases in chlorophyll control the degradation of green plants during leaf senescence and fruit ripening processes. Our previous daily monitoring of the natural senescence processes of Japanese maple (<i>Acer palmatum</i>) leaves demonstrated initial slow and later fast chlorophyll (Ch...
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2025-02-01
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| author | Satoru Nakashima Hinako Yamasaki Sumire Kanda |
| author_facet | Satoru Nakashima Hinako Yamasaki Sumire Kanda |
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| description | Decreases in chlorophyll control the degradation of green plants during leaf senescence and fruit ripening processes. Our previous daily monitoring of the natural senescence processes of Japanese maple (<i>Acer palmatum</i>) leaves demonstrated initial slow and later fast chlorophyll (Chl) decrease rates. In this study, Chl decrease processes were monitored by in situ visible and near-infrared spectroscopy during heating of maple leaves to 30–200 °C. The initial decreases with time in the 640–720 nm band area, due mainly to chlorophyll a after the water decrease, were fitted by first-order kinetics. The obtained rate constants <i>k</i><sub>1</sub> from 200 to 60 °C showed a quasi-linear trend on an Arrhenius plot with an activation energy <i>E</i>a of 38 kJ·mol<sup>−1</sup>, while those from 60 to 30 °C had a different trend with an <i>E</i>a of 91 kJ·mol<sup>−1</sup>. Since the previous natural faster Chl decrease rates are on the extension of the higher-temperature trend, this process might occur without the protection of proteins in the photosynthetic system. On the other hand, the previous natural slower Chl decrease rates are on the extension of the lower-temperature trend, and might have protein protection. |
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| spelling | doaj-art-2b24b9a4744c4868bf4fafa99b75e18e2025-08-20T01:48:57ZengMDPI AGLife2075-17292025-02-0115333510.3390/life15030335Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic MonitoringSatoru Nakashima0Hinako Yamasaki1Sumire Kanda2Research Institute for Natural Environment, Science and Technology (RINEST), 3-19-20-103, Kasuga, Suita 565-0853, Osaka, JapanDepartment of Life Science and Biotechnology, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35, Yamate-cho, Suita 564-8680, Osaka, JapanDepartment of Chemical, Energy and Environmental Engineering, Faculty of Environmental and Urban Engineering, Kansai University, 3-3-35, Yamate-cho, Suita 564-8680, Osaka, JapanDecreases in chlorophyll control the degradation of green plants during leaf senescence and fruit ripening processes. Our previous daily monitoring of the natural senescence processes of Japanese maple (<i>Acer palmatum</i>) leaves demonstrated initial slow and later fast chlorophyll (Chl) decrease rates. In this study, Chl decrease processes were monitored by in situ visible and near-infrared spectroscopy during heating of maple leaves to 30–200 °C. The initial decreases with time in the 640–720 nm band area, due mainly to chlorophyll a after the water decrease, were fitted by first-order kinetics. The obtained rate constants <i>k</i><sub>1</sub> from 200 to 60 °C showed a quasi-linear trend on an Arrhenius plot with an activation energy <i>E</i>a of 38 kJ·mol<sup>−1</sup>, while those from 60 to 30 °C had a different trend with an <i>E</i>a of 91 kJ·mol<sup>−1</sup>. Since the previous natural faster Chl decrease rates are on the extension of the higher-temperature trend, this process might occur without the protection of proteins in the photosynthetic system. On the other hand, the previous natural slower Chl decrease rates are on the extension of the lower-temperature trend, and might have protein protection.https://www.mdpi.com/2075-1729/15/3/335chlorophyllsdegradationvisible spectroscopynear-infrared spectroscopyfluorescence spectradehydration |
| spellingShingle | Satoru Nakashima Hinako Yamasaki Sumire Kanda Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring Life chlorophylls degradation visible spectroscopy near-infrared spectroscopy fluorescence spectra dehydration |
| title | Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring |
| title_full | Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring |
| title_fullStr | Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring |
| title_full_unstemmed | Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring |
| title_short | Kinetics of Chlorophyll Degradation in Japanese Maple (<i>Acer palmatum</i>) Leaves with In Situ Heating Visible and Near-Infrared Spectroscopic Monitoring |
| title_sort | kinetics of chlorophyll degradation in japanese maple i acer palmatum i leaves with in situ heating visible and near infrared spectroscopic monitoring |
| topic | chlorophylls degradation visible spectroscopy near-infrared spectroscopy fluorescence spectra dehydration |
| url | https://www.mdpi.com/2075-1729/15/3/335 |
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