Abstract
Serial germination tests were carried out on dormant seeds of six rice varieties (four varieties of Oryza sativa L. and two varieties of O. glaberrima Steud.) stored at several different constant temperatures within the range 27° C to 57° C. Probit analyses of the results were carried out to determme the mean dormancy period for each variety at each temperature. Regression lines fitted to these data showed that there is a direct negative relationship between storage temperature and log mean dormancy period over the range 27° C to 47° C, thus confirming a previous result obtained on a single variety. At 7° C there were indications of a slight departure from this relationship in that the mean dormancy periods at this temperature were slightly longer than would have been predicted by extrapolation of the regressions calculated from the results obtained at lower temperatures. In all cases where the results were unambiguous (i.e. in all the sativa varieties and one of the glaberrima varieties) a constant Q10 of 3.13 was shown for the rate of loss of dormancy over the range of storage temperatures from 27° C to 47° C. In the remaining glaberrima variety, where the results were less reliable, a Q10 of 2.54 was found. Germination tests on all varieties were carried out at 32° C, but in the case of one sativa variety germination tests for all storage treatments were also duplicated at 27° C. This investigation showed that, in contrast to the effect of storage temperature, the higher temperature during the germination test consistently resulted in a lower percentage germination. In addition the results demonstrated that there is no interaction between storage temperature and germination temperature: consequently the storage-temperature coefficient has the same value irrespective of germination temperature. Some theoretical implications of the results are discussed.
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Claims 5
Claim · model-written summary
Log mean dormancy period decreased linearly with increasing storage temperature from 27 to 47 °C.
- Taxon
- Rice
Oryza sativat0 - Treatment
- storage temperaturee1
- Outcome
- log mean dormancy periode1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Regression lines fitted to these data showed that there is a direct negative relationship between storage temperature and log mean dormancy period over the range 27° C to 47° C”
t0“Rice”
Claim · model-written summary
A constant Q10 of 3.13 described the rate of loss of dormancy over 27 to 47 °C storage.
- Taxon
- RiceOryza sativat0
- Outcome
- rate of loss of dormancye2
- Value
- 3.13e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“a constant Q10 of 3.13 was shown for the rate of loss of dormancy over the range of storage temperatures from 27° C to 47° C”
t0“Rice”
Claim · model-written summary
In the remaining glaberrima variety a Q10 of 2.54 was found.
- Taxon
- RiceOryza sativat0
- Material
- glaberrima varietye3
- Outcome
- Q10e3
- Value
- 2.54e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“In the remaining glaberrima variety, where the results were less reliable, a Q10 of 2.54 was found”
t0“Rice”
Claim · model-written summary
A higher temperature during the germination test consistently gave a lower percentage germination.
- Taxon
- RiceOryza sativat0
- Treatment
- higher temperature during the germination teste4
- Outcome
- percentage germinatione4
- Direction
- lowere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the higher temperature during the germination test consistently resulted in a lower percentage germination”
t0“Rice”
Claim · model-written summary
There was no interaction between storage temperature and germination temperature.
- Taxon
- RiceOryza sativat0
- Treatment
- storage temperaturee5
- Outcome
- interactione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“there is no interaction between storage temperature and germination temperature”
t0“Rice”
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