Abstract
Abstract Chilling temperatures drastically inhibited the photochemical quenching of chlorophyll fluorescence (q Q ) measured in intact leaves photosynthesizing under steady‐state conditions. This effect appeared, however, to be characteristic of chilling‐susceptible plant species and was not observed in plants which are known to be chilling‐tolerant, indicating that the measurement of q Q can serve in practice to estimate rapidly the relative chilling tolerance of crop plants. A large number (28) of sweet sorghum ( Sorghum bicolor ) and Sudan grass ( Sorghum sudanense ) genotypes were screened for chilling tolerance using this rapid q Q method. Although sweet sorghum and sudan grass obviously behaved as chilling‐sensitive plants, a considerable variation for chilling susceptibility was observed among the different genotypes tested. Some sweet sorghum varieties, such as ‘Dale’ and ‘Keller’, and most of the sudan grass varieties appeared to possess a certain degree of resistance towards low temperature stress, indicating the existence of useful germplasms in Sorghum for improving stress tolerance.
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Claims 7
Claim · model-written summary
Chilling temperatures drastically inhibited photochemical quenching of chlorophyll fluorescence in leaves of chilling-susceptible species, but not in chilling-tolerant plants.
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e0“Chilling temperatures drastically inhibited the photochemical quenching of chlorophyll fluorescence (q Q ) measured in intact leaves”
e1“was not observed in plants which are known to be chilling‐tolerant”
Claim · model-written summary
Sweet sorghum and sudan grass behaved as chilling-sensitive plants.
Not reportedDirection
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e2“Although sweet sorghum and sudan grass obviously behaved as chilling‐sensitive plants”
Claim · model-written summary
A considerable variation in chilling susceptibility was observed among the sorghum genotypes tested.
Not reportedDirection
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e3“a considerable variation for chilling susceptibility was observed among the different genotypes tested”
Claim · model-written summary
Sweet sorghum varieties Dale and Keller appeared to have resistance towards low temperature stress.
Not reportedDirection
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e4“Some sweet sorghum varieties, such as ‘Dale’ and ‘Keller’, and most of the sudan grass varieties appeared to possess a certain degree of resistance towards low temperature stress”
Claim · model-written summary
Most sudan grass varieties appeared to have resistance towards low temperature stress.
- Taxon
- Sudan Grass
Sorghum ×drummondiit0 - Material
- sudan grass varietiese4
- Outcome
- resistance towards low temperature stresse4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e4“Some sweet sorghum varieties, such as ‘Dale’ and ‘Keller’, and most of the sudan grass varieties appeared to possess a certain degree of resistance towards low temperature stress”
Claim · model-written summary
Useful sorghum germplasm exists for improving stress tolerance.
- Outcome
- stress tolerancee5
SorghumNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e5“indicating the existence of useful germplasms in Sorghum for improving stress tolerance”
Claim · model-written summary
Measuring q Q can rapidly estimate the relative chilling tolerance of crop plants.
Verbatim
t0“Chilling Tolerance in Sweet Sorghum and Sudan Grass”
e6“the measurement of q Q can serve in practice to estimate rapidly the relative chilling tolerance of crop plants”
e1“was not observed in plants which are known to be chilling‐tolerant”
The same questions in other papers
cold · physiology: photosynthesis · SorghumPositive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
3 papers more in this group
See all 7 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.