Abstract
Potato tubers ( Solanum tubersoum cvs Bintje and King Edward). never exposed to light, lack chlorophyllous pigments. Continuous irradiation results in chlorophyll (Chl) formation and induces the ability for protochlorophyll (Pchl) formation when the tubers are brought back to darkness. Pigment synthesis takes place in both blue and red light, but blue light is more effective than red in starting the greening process. The pigment formation is strongest in the layers just below the periderm with a steep gradient inwards. Small amounts of Chl formed after irradiation. slowly fade away during extended darkness. However, the Chl formed after long time of irradiation is remarkably stable. Irradiated potatoes, placed in darkness, form Pchl with a fluorescence emission peak at 633 nm. A maximal level is reached after ca 7 days. Resolution of the Pchl spectrum suggests the presence of small amounts of a pigment with an emission maximum at around 642 nm. No sign of the Pchl with emission maximum at 657 nm, which dominates in etiolated leaves, is found. A faint Chl fluorescence indicates that some Pchl, probably the 642 nm form, is phototransformed into Chl in weak light. The Chl formation in the potato tuber is discussed in relation to that of roots and leaves.
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Claims 11
Claim · model-written summary
Unexposed potato tubers lacked chlorophyllous pigments.
- Taxon
- potato
Solanum tuberosumt0 - Organ / stage
- tuberst0
- Outcome
- lack chlorophyllous pigmentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“never exposed to light, lack chlorophyllous pigments”
Claim · model-written summary
Continuous irradiation formed chlorophyll and enabled protochlorophyll formation in later darkness.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- tuberse0
- Treatment
- Continuous irradiatione0
- Outcome
- chlorophyll (Chl) formation and induces the ability for protochlorophyll (Pchl) formatione0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“Continuous irradiation results in chlorophyll (Chl) formation and induces the ability for protochlorophyll (Pchl) formation when the tubers are brought back to darkness”
Claim · model-written summary
Blue light initiated tuber greening more effectively than red light.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- blue lighte0
- Outcome
- greening processe0
- Direction
- more effectivee0
- Comparator
- rede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“blue light is more effective than red in starting the greening process”
Claim · model-written summary
Pigment formation was strongest below the periderm and declined inward.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- layers just below the periderme0
- Outcome
- pigment formatione0
- Direction
- strongeste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“The pigment formation is strongest in the layers just below the periderm with a steep gradient inwards”
Claim · model-written summary
Chlorophyll formed after brief irradiation faded slowly during extended darkness.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Chle0
- Direction
- fade awaye0
- Qualifier
- during extended darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“Small amounts of Chl formed after irradiation. slowly fade away during extended darkness”
Claim · model-written summary
Chlorophyll formed after long irradiation was stable.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- Chle0
- Qualifier
- after long time of irradiatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“the Chl formed after long time of irradiation is remarkably stable”
Claim · model-written summary
Irradiated potato tubers formed protochlorophyll in darkness with a 633 nm fluorescence peak.
- Taxon
- potatoesSolanum tuberosume0
- Outcome
- Pchl with a fluorescence emission peake0
- Value
- 633 nme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irradiated potatoes, placed in darkness, form Pchl with a fluorescence emission peak at 633 nm”
Claim · model-written summary
Protochlorophyll reached a maximal level after about seven days.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- maximal levele0
- Direction
- maximale0
- Value
- ca 7 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“A maximal level is reached after ca 7 days”
Claim · model-written summary
Spectral resolution suggested a minor pigment with an emission maximum near 642 nm.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- a pigment with an emission maximume0
- Value
- around 642 nme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“Resolution of the Pchl spectrum suggests the presence of small amounts of a pigment with an emission maximum at around 642 nm”
Claim · model-written summary
The 657 nm protochlorophyll form was not found in potato tubers.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- No sign of the Pchl with emission maximume0
- Value
- 657 nme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“No sign of the Pchl with emission maximum at 657 nm, which dominates in etiolated leaves, is found”
Claim · model-written summary
Faint chlorophyll fluorescence suggested phototransformation of protochlorophyll in weak light.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- phototransformed into Chle0
- Qualifier
- in weak lighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“potato tubers”
e0“A faint Chl fluorescence indicates that some Pchl, probably the 642 nm form, is phototransformed into Chl in weak light”
The same questions in other papers
radiation · physiology: pigments · Solanum tuberosum (potato)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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.