Abstract
The mechanistic basis for differential sensitivities to chilling‐induced photoinhibition among two rice ( Oryza sativa L.) cultivars (an Indica and a Japonica type) and one barley cultivar ( Hordeum vulgare L. cv. Albori) was examined. When leaf segments were exposed to moderate illumination at 4°C, a sustained decrease in the photochemical efficiency of photosystem (PS) II measured as the ratio of variable to maximal fluorescence (F v /F m ) was observed for several hours. An analysis of fluorescence quenching revealed a sudden drop in PSII‐driven electron transport rate (ETR) and a rapid rise in the reduction state of the primary electron acceptor Q A upon exposure to chilling in moderate light. There was no appreciable difference in the level of non‐photochemical quenching (NPQ) nor in the xanthophyll cycle activity between Japonica rice and barley. However, barley was capable of sustaining a higher ETR, thereby keeping a lower reduction state of Q A throughout the chilling for 6 h. The Indica rice was characterized by the lowest ability to develop the xanthophyll cycle‐associated NPQ, particularly the fast relaxing NPQ component (qf), accompanied by the highest reduction state of Q A and photoinhibitory quenching (qI). It is concluded that the lower susceptibility of barley to chilling‐induced photoinhibition than Japonica rice is attributable to its higher potential to dissipate excess light energy via a photochemical mechanism, whereas Indica rice is more sensitive to photoinhibition at a chilling temperature than Japonica rice, due primarily to its lower capacity to develop an efficient NPQ pathway.
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Claims 8
Claim · model-written summary
Chilling in moderate light at 4°C caused a sustained decrease in PSII photochemical efficiency in rice and barley leaf segments.
- Taxon
- rice and barley
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Hordeum vulgare
Oryza sativat0 - Treatment
- moderate illumination at 4°Ce1
- Outcome
- photochemical efficiencye1
- Direction
- sustained decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
t0“Relative contributions of photochemical and non‐photochemical routes to excitation energy dissipation in rice and barley illuminated at a chilling temperature”
e1“When leaf segments were exposed to moderate illumination at 4°C, a sustained decrease in the photochemical efficiency of photosystem (PS) II”
Claim · model-written summary
Barley sustained a higher electron transport rate than the other cultivars throughout chilling for 6 h.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree0
- Material
- cv. Alborie0
- Outcome
- ETRe2
- Direction
- highere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among two rice ( Oryza sativa L.) cultivars (an Indica and a Japonica type) and one barley cultivar ( Hordeum vulgare L. cv. Albori) was examined”
e2“However, barley was capable of sustaining a higher ETR, thereby keeping a lower reduction state of Q A throughout the chilling for 6 h”
Claim · model-written summary
Barley kept a lower reduction state of Q A throughout chilling for 6 h.
- Taxon
- Hordeum vulgare L.Hordeum vulgaree0
- Material
- cv. Alborie0
- Outcome
- reduction state of Q Ae2
- Direction
- lowere2
- Qualifier
- throughout the chilling for 6 he2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among two rice ( Oryza sativa L.) cultivars (an Indica and a Japonica type) and one barley cultivar ( Hordeum vulgare L. cv. Albori) was examined”
e2“However, barley was capable of sustaining a higher ETR, thereby keeping a lower reduction state of Q A throughout the chilling for 6 h”
Claim · model-written summary
Indica rice had the lowest ability to develop xanthophyll cycle-associated NPQ.
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Indicae3
- Outcome
- NPQe3
- Direction
- loweste3
- Qualifier
- particularly the fast relaxing NPQ component (qf)e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among two rice ( Oryza sativa L.) cultivars (an Indica and a Japonica type) and one barley cultivar ( Hordeum vulgare L. cv. Albori) was examined”
e3“The Indica rice was characterized by the lowest ability to develop the xanthophyll cycle‐associated NPQ, particularly the fast relaxing NPQ component (qf), accompanied by the highest reduction state of Q A and photoinhibitory quenching (qI).”
Claim · model-written summary
Indica rice had the highest reduction state of Q A and photoinhibitory quenching (qI).
- Taxon
- Oryza sativa L.Oryza sativae0
- Material
- Indicae3
- Outcome
- reduction state of Q A and photoinhibitory quenching (qI)e3
- Direction
- higheste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“among two rice ( Oryza sativa L.) cultivars (an Indica and a Japonica type) and one barley cultivar ( Hordeum vulgare L. cv. Albori) was examined”
e3“The Indica rice was characterized by the lowest ability to develop the xanthophyll cycle‐associated NPQ, particularly the fast relaxing NPQ component (qf), accompanied by the highest reduction state of Q A and photoinhibitory quenching (qI).”
Claim · model-written summary
Barley is less susceptible to chilling photoinhibition than Japonica rice because of its higher photochemical dissipation potential.
- Taxon
- barleyHordeum vulgaree4
- Outcome
- lower susceptibilitye4
- Qualifier
- higher potential to dissipate excess light energy via a photochemical mechanisme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“It is concluded that the lower susceptibility of barley to chilling‐induced photoinhibition than Japonica rice is attributable to its higher potential to dissipate excess light energy via a photochemical mechanism, whereas Indica rice is more sensitive to photoinhibition at a chilling temperature than Japonica rice, due primarily to its lower capacity to develop an efficient NPQ pathway.”
Claim · model-written summary
Indica rice is more sensitive to photoinhibition than Japonica rice at chilling temperature because of its lower NPQ capacity.
- Taxon
- Indica rice
Oryza sativa Indica Groupe4 - Outcome
- more sensitive to photoinhibitione4
- Qualifier
- due primarily to its lower capacity to develop an efficient NPQ pathwaye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“It is concluded that the lower susceptibility of barley to chilling‐induced photoinhibition than Japonica rice is attributable to its higher potential to dissipate excess light energy via a photochemical mechanism, whereas Indica rice is more sensitive to photoinhibition at a chilling temperature than Japonica rice, due primarily to its lower capacity to develop an efficient NPQ pathway.”
Claim · model-written summary
Barley and Japonica rice did not differ appreciably in non-photochemical quenching or xanthophyll cycle activity.
- Taxon
- barleyHordeum vulgaree5
- Outcome
- xanthophyll cycle activitye5
- Direction
- no appreciable differencee5
- Comparator
- Japonica ricee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“There was no appreciable difference in the level of non‐photochemical quenching (NPQ) nor in the xanthophyll cycle activity between Japonica rice and barley.”
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See all 18 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.