Abstract
The photosynthetic pigment contents and the chlorophyll fluorescence induction in Norway spruce [ Picea abies (L.) Karst.] needles were monitored at 3 h intervals over a 10 day period. This covered 6 days of high insolation, one day of low insolation, followed by three more days of high insolation. During the first six days only small changes in mean pigment contents were observed but we interpret them as suggesting a daily rhythm in total chlorophyll content with two maxima and minima. The day of low insolation was paralleled by larger pigment changes, mostly an increase in chlorophyll b along with a decrease in carotenoid content. With the resumption of high insolation, pigments gradually return to their previous levels. During the entire period chlorophyll a fluorescence induction remained relatively constant. These short‐term responses may reflect features of thylakoid organization in relation to pigment content and suggest possible long‐term adaptive mechanisms in non deciduous conifers.
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Claims 6
Claim · model-written summary
Mean needle pigment contents changed only slightly during the first six days of high insolation.
- Taxon
- Norway spruce
Picea abiest0 - Organ / stage
- needlest0
- Outcome
- mean pigment contentse0
- Direction
- small changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first six days only small changes in mean pigment contents were observed”
t0“Norway spruce needles”
Claim · model-written summary
Total chlorophyll content suggested a daily rhythm with two maxima and minima.
- Taxon
- Norway sprucePicea abiest0
- Outcome
- daily rhythm in total chlorophyll contente0
- Value
- two maxima and minimae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“suggesting a daily rhythm in total chlorophyll content with two maxima and minima”
t0“Norway spruce needles”
Claim · model-written summary
On the low insolation day, chlorophyll b increased.
- Taxon
- Norway sprucePicea abiest0
- Outcome
- chlorophyll be0
- Direction
- increasee0
- Qualifier
- day of low insolatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The day of low insolation was paralleled by larger pigment changes, mostly an increase in chlorophyll b along with a decrease in carotenoid content.”
t0“Norway spruce needles”
Claim · model-written summary
On the low insolation day, carotenoid content decreased.
- Taxon
- Norway sprucePicea abiest0
- Outcome
- carotenoid contente0
- Direction
- decreasee0
- Qualifier
- day of low insolatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The day of low insolation was paralleled by larger pigment changes, mostly an increase in chlorophyll b along with a decrease in carotenoid content.”
t0“Norway spruce needles”
Claim · model-written summary
Pigments gradually returned to earlier levels after high insolation resumed.
- Taxon
- Norway sprucePicea abiest0
- Outcome
- pigmentse0
- Direction
- return to their previous levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the resumption of high insolation, pigments gradually return to their previous levels.”
t0“Norway spruce needles”
Claim · model-written summary
Chlorophyll a fluorescence induction stayed relatively constant.
- Taxon
- Norway sprucePicea abiest0
- Outcome
- chlorophyll a fluorescence inductione0
- Direction
- remained relatively constante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the entire period chlorophyll a fluorescence induction remained relatively constant.”
t0“Norway spruce needles”