NDLI: Winter photoinhibition in needles of Taxus baccata seedlings acclimated to different light levels

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Winter photoinhibition in needles of Taxus baccata seedlings acclimated to different light levels

Content Provider	Springer Nature Link
Author	Robakowski, P. Wyka, T.
Copyright Year	2010
Abstract	Seasonal variability of maximum quantum yield of PSII photochemistry (F$_{v}$/F$_{m}$) was studied in needles of Taxus baccata seedlings acclimated to full light (HL, 100% solar irradiance), medium light (ML, 18% irradiance) or low light (LL, 5% irradiance). In HL plants, F$_{v}$/F$_{m}$ was below 0.8 (i.e. state of photoinhibition) throughout the whole experimental period from November to May, with the greatest decline in January and February (when F$_{v}$/F$_{m}$ value reached 0.37). In ML seedlings, significant declines of F$_{v}$/F$_{m}$ occurred in January (with the lowest level at 0.666), whereas the decline in LL seedlings (down to 0.750) was not significant. Full recovery of F$_{v}$/F$_{m}$ in HL seedlings was delayed until the end of May, in contrast to ML and LL seedlings. F$_{v}$/F$_{m}$ was significantly correlated with daily mean (T $_{mean}$), maximal (T $_{max}$) and minimal (T $_{min}$) temperature and T $_{min}$ was consistently the best predictor of F$_{v}$/F$_{m}$ in HL and ML needles. Temperature averages obtained over 3 or 5 days prior to measurement were better predictors of F$_{v}$/F$_{m}$ than 1- or 30-day averages. Thus our results indicate a strong light-dependent seasonal photoinhibition in needles of T. baccata as well as suggest a coupling of F$_{v}$/F$_{m}$ to cumulative temperature from several preceding days. The dependence of sustained winter photoinhibition on light level to which the plants are acclimated was further demonstrated when plants from the three light environments were exposed to full daylight over single days in December, February and April and F$_{v}$/F$_{m}$ was followed throughout the day to determine residual sensitivity of electron transport to ambient irradiance. In February, the treatment revealed a considerable midday increase in photoinhibition in ML plants, much less in HL (already downregulated) and none in LL plants. This suggested a greater capacity for photosynthetic utilization of electrons in LL plants and a readiness for rapid induction of photoinhibition in ML plants. Further differences between plants acclimated to contrasting light regimes were revealed during springtime de-acclimation, when short term regeneration dynamics of F$_{v}$/F$_{m}$ and the relaxation of nonphotochemical quenching (NPQ) indicated a stronger persistent thermal mechanism for energy dissipation in HL plants. The ability of Taxus baccata to sustain winter photoinhibition from autumn until late spring can be beneficial for protection against an excessive light occurring together with frosts but may also restrict photosynthetic carbon gain by this shade-tolerant species when growing in well illuminated sites.
Starting Page	527
Ending Page	535
Page Count	9
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	47
Issue Number	4
e-ISSN	15739058
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-02-17
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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