Abstract
Formulae were developed for calculation of the relative amount of different pigment forms of dark grown leaves of wheat, present before and after photoreduction of the protochlorophyllide. Three pigment forms were calculated from in vivo absorption spectra: the photoreducible protochlorophyllide with absorption maximum at 650 nm and the two chlorophyll(ide) forms with absorption maximum at 684 nm and 673 nm, respectively. The formulae were used to study the changes of the pigment forms at repeated photoreduction of the protochlorophyllide, and at a repeated treatment involving photoreduction of the protochlorophyllide followed by partial photo‐decomposition of the chlorophyllide formed. Five consecutive photoreductions and reaccumulations of protochlorophyllide were carried out by high intensity irradiations of one second (red light, 700 W m ‐2 ) given at intervals of 3 h. The results show that the pool size of reaccumulated protochlorophyllide decreased sharply with the number of photoreductions performed. The absorption spectrum of the chlorophyllide formed at each photoreduction proceeded through the Shibata shift (transformation of the 684‐form to the 673‐form) and the late red‐shift (transformation of the 673‐form to other pigment form(s) in the dark). High intensity irradiation for ten minutes (red light, 700 W m ‐2 ) immediately after each phototransformation caused a photodecomposition of about three quarters of the newly formed chlorophyllide (which was in the 684‐form) while the earlier formed chlorophyll(ide) (in the 673‐form) appeared not to be decomposed. This partial photodecomposition of the chlorophyllide had no effect on further accumulation of protochlorophyllide in the dark, and the absorption spectrum of the remaining chlorophyllide proceeded through the Shibata shift. The partial photodecomposition caused an inhibition of the late red‐shift, and the accumulated chlorophyll(ide) remained in the 673‐form.
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Claims 10
Claim · model-written summary
Formulae quantified three pigment forms from in vivo absorption spectra.
- Taxon
- wheat
Triticum aestivumt0 - Outcome
- Three pigment forms were calculatede0
- Value
- Three pigment formse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three pigment forms were calculated from in vivo absorption spectra: the photoreducible protochlorophyllide with absorption maximum at 650 nm and the two chlorophyll(ide) forms with absorption maximum at 684 nm and 673 nm, respectively”
t0“wheat”
Claim · model-written summary
The pool of reaccumulated protochlorophyllide fell sharply with additional photoreductions.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- photoreductionse0
- Outcome
- pool size of reaccumulated protochlorophyllidee0
- Direction
- decreased sharplye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the pool size of reaccumulated protochlorophyllide decreased sharply with the number of photoreductions performed”
t0“wheat”
Claim · model-written summary
Chlorophyllide shifted from the 684-form to the 673-form after each photoreduction.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- transformation of the 684‐form to the 673‐forme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Shibata shift (transformation of the 684‐form to the 673‐form)”
t0“wheat”
Claim · model-written summary
The 673-form subsequently shifted to other pigment forms in darkness.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- transformation of the 673‐form to other pigment form(s) in the darke0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the late red‐shift (transformation of the 673‐form to other pigment form(s) in the dark)”
t0“wheat”
Claim · model-written summary
Ten minutes of high-intensity red light decomposed about three quarters of newly formed 684-form chlorophyllide.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- High intensity irradiation for ten minutes (red light, 700 W m ‐2 )e0
- Outcome
- photodecomposition of about three quarters of the newly formed chlorophyllidee0
- Direction
- photodecompositione0
- Value
- about three quarterse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High intensity irradiation for ten minutes (red light, 700 W m ‐2 ) immediately after each phototransformation caused a photodecomposition of about three quarters of the newly formed chlorophyllide (which was in the 684‐form)”
t0“wheat”
Claim · model-written summary
Earlier formed 673-form chlorophyllide appeared resistant to that light treatment.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- High intensity irradiatione1
- Outcome
- earlier formed chlorophyll(ide)e0
- Direction
- not to be decomposede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the earlier formed chlorophyll(ide) (in the 673‐form) appeared not to be decomposed”
t0“wheat”
e1“High intensity irradiation for ten minutes (red light, 700 W m ‐2 )”
Claim · model-written summary
Partial chlorophyllide photodecomposition did not affect subsequent dark protochlorophyllide accumulation.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- partial photodecomposition of the chlorophyllidee0
- Outcome
- further accumulation of protochlorophyllide in the darke0
- Direction
- had no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This partial photodecomposition of the chlorophyllide had no effect on further accumulation of protochlorophyllide in the dark”
t0“wheat”
Claim · model-written summary
After partial photodecomposition, remaining chlorophyllide underwent the Shibata shift.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- proceeded through the Shibata shifte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the absorption spectrum of the remaining chlorophyllide proceeded through the Shibata shift”
t0“wheat”
Claim · model-written summary
Partial photodecomposition inhibited the late red-shift.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- partial photodecompositione0
- Outcome
- late red‐shifte0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The partial photodecomposition caused an inhibition of the late red‐shift”
t0“wheat”
Claim · model-written summary
Accumulated chlorophyllide remained in the 673-form following partial photodecomposition.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- remained in the 673‐forme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulated chlorophyll(ide) remained in the 673‐form”
t0“wheat”
The same questions in other papers
radiation · physiology: pigments · Triticum aestivum (wheat)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
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6 papers more in this group
See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.