ArticleJournal of experimental botany2015
Zeaxanthin-independent energy quenching and alternative electron sinks cause a decoupling of the relationship between the photochemical reflectance index (PRI) and photosynthesis in an evergreen conifer during spring.
Article in Journal of experimental botany, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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12 citing papers in PubMed, 40 citations in OpenAlex.
- Contrasting effects of warming and drought on autumn phenology of photosynthesis and growth in white spruce.Plant physiology · 2025Article
- Photoprotective pigment plasticity and cold acclimation strategies inForestry research · 2025Article
- Accounting for photosystem I photoinhibition sheds new light on seasonal acclimation strategies of boreal conifers.Journal of experimental botany · 2024Article
- Use of thermal imaging and the photochemical reflectance index (PRI) to detect wheat response to elevated COPlant, cell & environment · 2023Article
- Physiological cold tolerance evolves faster than climatic niches in plants.Frontiers in plant science · 2023Article
- Drone-based physiological index reveals long-term acclimation and drought stress responses in trees.Plant, cell & environment · 2021Article
- Seasonal variation in the canopy color of temperate evergreen conifer forests.The New phytologist · 2021Article
- The Effect of Leaf Stacking on Leaf Reflectance and Vegetation Indices Measured by Contact Probe during the Season.Sensors (Basel, Switzerland) · 2017Article
- Variation in short-term and long-term responses of photosynthesis and isoprenoid-mediated photoprotection to soil water availability in four Douglas-fir provenances.Scientific reports · 2017Article
- A remotely sensed pigment index reveals photosynthetic phenology in evergreen conifers.Proceedings of the National Academy of Sciences of the United States of America · 2016Article
- Elevated Temperature and CO2 Stimulate Late-Season Photosynthesis But Impair Cold Hardening in Pine.Plant physiology · 2016Article
- Photoperiod and temperature constraints on the relationship between the photochemical reflectance index and the light use efficiency of photosynthesis in Pinus strobus.Tree physiology · 2016Article
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In evergreen conifers, the winter down-regulation of photosynthesis and its recovery during spring are the result of a reorganization of the chloroplast and adjustments of energy-quenching mechanisms. These phenological changes may remain undetected by remote sensing, as conifers retain green foliage during periods of photosynthetic down-regulation. The aim was to assess if the timing of the spring recovery of photosynthesis and energy-quenching characteristics are accurately monitored by the photochemical reflectance index (PRI) in the evergreen conifer Pinus strobus. The recovery of photosynthesis was studied using chlorophyll fluorescence, leaf gas exchange, leaf spectral reflectance, and photosynthetic pigment measurements. To assess if climate change might affect the recovery of photosynthesis, seedlings were exposed to cold spring conditions or warm spring conditions with elevated temperature. An early spring decoupling of the relationship between photosynthesis and PRI in both treatments was observed. This was caused by differences between the timing of the recovery of photosynthesis and the timing of carotenoid and chlorophyll pool size adjustments which are the main factors controlling PRI during spring. It was also demonstrated that zeaxanthin-independent NPQ mechanisms undetected by PRI further contributed to the early spring decoupling of the PRI-LUE relationship. An important mechanism undetected by PRI seems to involve increased electron transport around photosystem I, which was a significant energy sink during the entire spring transition, particularly in needles exposed to a combination of high light and cold temperatures.
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