Abstract
Winter cultivars of rye (Secale cereale L., cv Musketeer) and wheat (Triticum aestivum L. cvs Kharkov and Monopol), but not a spring cultivar of wheat (Glenlea), grown at cold-hardening temperatures showed, at high irradiances, a higher proportion of oxidized to reduced primary, stable quinone receptor (QA) than did the same cultivars grown under nonhardening conditions. In addition, there was a positive correlation between the effects of low-growth temperature on this increased proportion of oxidized QA, and a concomitant increase in the capacity for photosynthesis, and LT50, the temperature at which 50% of the seedlings are killed, in cultivars showing different freezing tolerances. This suggests that low-temperature modulation of the photosynthetic apparatus may be an important factor during the induction of freezing resistance in cereals. Finally, the control of photosystem II photochemistry by nonphotochemical quenching of excitation energy was identical for nonhardened and cold-hardened winter rye. However, examination of measuring temperature effects per se revealed that, irrespective of growth temperature, nonphotochemical quenching exerted a stronger control on photosystem II photochemistry at 10[deg] C rather than at 20[deg] C.
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Claims 7
Claim · model-written summary
Cold hardened winter rye had a higher oxidized to reduced QA proportion at high irradiance than nonhardened rye.
- Taxon
- rye
Secale cerealee0 - Material
- Musketeere0
- Treatment
- cold-hardening temperaturese0
- Outcome
- proportion of oxidized to reduced primary, stable quinone receptor (QA)e0
- Direction
- highere0
- Comparator
- nonhardening conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter cultivars of rye (Secale cereale L., cv Musketeer) and wheat (Triticum aestivum L. cvs Kharkov and Monopol), but not a spring cultivar of wheat (Glenlea), grown at cold-hardening temperatures showed, at high irradiances, a higher proportion of oxidized to reduced primary, stable quinone receptor (QA) than did the same cultivars grown under nonhardening conditions.”
Claim · model-written summary
Cold hardened winter wheat cultivars had a higher oxidized to reduced QA proportion at high irradiance than nonhardened counterparts.
- Taxon
- wheat
Triticum aestivume0 - Material
- Kharkov and Monopole0
- Treatment
- cold-hardening temperaturese0
- Outcome
- proportion of oxidized to reduced primary, stable quinone receptor (QA)e0
- Direction
- highere0
- Comparator
- nonhardening conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter cultivars of rye (Secale cereale L., cv Musketeer) and wheat (Triticum aestivum L. cvs Kharkov and Monopol), but not a spring cultivar of wheat (Glenlea), grown at cold-hardening temperatures showed, at high irradiances, a higher proportion of oxidized to reduced primary, stable quinone receptor (QA) than did the same cultivars grown under nonhardening conditions.”
Claim · model-written summary
Spring wheat Glenlea did not show the QA proportion response to cold hardening seen in winter cultivars.
- Taxon
- wheatTriticum aestivume0
- Material
- Glenleae0
- Treatment
- cold-hardening temperaturese0
- Outcome
- proportion of oxidized to reduced primary, stable quinone receptor (QA)e0
- Direction
- not a spring cultivare0
- Comparator
- nonhardening conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Winter cultivars of rye (Secale cereale L., cv Musketeer) and wheat (Triticum aestivum L. cvs Kharkov and Monopol), but not a spring cultivar of wheat (Glenlea), grown at cold-hardening temperatures showed, at high irradiances, a higher proportion of oxidized to reduced primary, stable quinone receptor (QA) than did the same cultivars grown under nonhardening conditions.”
Claim · model-written summary
The cold induced increase in oxidized QA proportion and photosynthetic capacity correlated positively with LT50 across cultivars of differing freezing tolerance.
- Taxon
- wheat and ryeSecale cerealeTriticum aestivumt0
- Treatment
- low-growth temperaturee0
- Outcome
- LT50e0
- Direction
- positive correlatione0
- Qualifier
- cultivars showing different freezing tolerancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In addition, there was a positive correlation between the effects of low-growth temperature on this increased proportion of oxidized QA, and a concomitant increase in the capacity for photosynthesis, and LT50, the temperature at which 50% of the seedlings are killed, in cultivars showing different freezing tolerances.”
t0“Wheat and Rye”
Claim · model-written summary
Low temperature modulation of photosynthesis may contribute to induction of cereal freezing resistance.
Verbatim
e0“This suggests that low-temperature modulation of the photosynthetic apparatus may be an important factor during the induction of freezing resistance in cereals.”
Claim · model-written summary
Nonphotochemical quenching controlled photosystem II photochemistry identically in nonhardened and cold hardened winter rye.
- Taxon
- winter ryeSecale cerealee0
- Treatment
- cold-hardenede0
- Outcome
- control of photosystem II photochemistrye0
- Direction
- identicale0
- Comparator
- nonhardenede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Finally, the control of photosystem II photochemistry by nonphotochemical quenching of excitation energy was identical for nonhardened and cold-hardened winter rye.”
Claim · model-written summary
Nonphotochemical quenching exerted stronger control on photosystem II photochemistry at 10 than at 20 degrees C regardless of growth temperature.
- Taxon
- RyeSecale cerealet0
- Treatment
- 10[deg] Ce0
- Outcome
- control on photosystem II photochemistrye0
- Direction
- strongere0
- Qualifier
- irrespective of growth temperaturee0
- Comparator
- 20[deg] Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, examination of measuring temperature effects per se revealed that, irrespective of growth temperature, nonphotochemical quenching exerted a stronger control on photosystem II photochemistry at 10[deg] C rather than at 20[deg] C.”
t0“Rye”
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See all 53 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.