Abstract
Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms. Primary dormancy was variably expressed in freshly harvested seed and overcome by 'after ripening' during storage of up to three months. Long-term dormancy may be due to mechanical restriction imposed by the seed coat and to inhibition of oxygen diffusion due to the closely appressed, hard, shiny palea and lemma structures enclosing the caryopsis. Removal of these structures by hand allowed germination percentages up to 100 in naked caryopses. Impermeability of the seed coat declined with time in storage up to one year. Germination of intact stored seed reached 40% to 55%. Further storage at 10 deg C and 29% RH up to 4 years 6 months did not result in increased germination in intact caryopses, although viability was maintained at 80% to 90%. Scarification in concentrated H(,2)SO(,4) for 20 minutes increased germination of stored seed to 72%.
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Claims 9
Claim · model-written summary
Primary dormancy in Brachiaria decumbens seed was overcome by after-ripening during storage of up to three months, compared with freshly harvested seed.
- Taxon
- Brachiaria decumbens
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Urochloa decumbense0 - Treatment
- storage of up to three monthse1
- Outcome
- Primary dormancye1
- Direction
- overcomee1
- Comparator
- freshly harvested seede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
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Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e1“Primary dormancy was variably expressed in freshly harvested seed and overcome by 'after ripening' during storage of up to three months”
Claim · model-written summary
Long-term dormancy may be due to mechanical restriction imposed by the seed coat.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Outcome
- Long-term dormancye2
- Qualifier
- mechanical restriction imposed by the seed coate2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e2“Long-term dormancy may be due to mechanical restriction imposed by the seed coat and to inhibition of oxygen diffusion due to the closely appressed, hard, shiny palea and lemma structures enclosing the caryopsis”
Claim · model-written summary
Long-term dormancy may be due to inhibition of oxygen diffusion by the closely appressed palea and lemma.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Outcome
- Long-term dormancye2
- Qualifier
- inhibition of oxygen diffusione2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e2“Long-term dormancy may be due to mechanical restriction imposed by the seed coat and to inhibition of oxygen diffusion due to the closely appressed, hard, shiny palea and lemma structures enclosing the caryopsis”
Claim · model-written summary
Removing the palea and lemma by hand allowed germination percentages up to 100 in naked caryopses.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Organ / stage
- naked caryopsese3
- Treatment
- Removal of these structures by hande3
- Outcome
- germination percentagese3
- Direction
- increaseinferrede3
- Value
- up to 100e3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e3“Removal of these structures by hand allowed germination percentages up to 100 in naked caryopses”
Claim · model-written summary
Impermeability of the seed coat declined with time in storage up to one year.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Organ / stage
- seed coate4
- Treatment
- storage up to one yeare4
- Outcome
- Impermeability of the seed coate4
- Direction
- declinede4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e4“Impermeability of the seed coat declined with time in storage up to one year”
Claim · model-written summary
Germination of intact stored seed reached 40% to 55%.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Outcome
- Germination of intact stored seede5
- Value
- 40% to 55%e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e5“Germination of intact stored seed reached 40% to 55%”
Claim · model-written summary
Further storage at 10 deg C and 29% RH up to 4 years 6 months did not increase germination in intact caryopses.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Treatment
- Further storage at 10 deg C and 29% RH up to 4 years 6 monthse6
- Outcome
- germination in intact caryopsese6
- Direction
- did not result in increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e6“Further storage at 10 deg C and 29% RH up to 4 years 6 months did not result in increased germination in intact caryopses, although viability was maintained at 80% to 90%”
Claim · model-written summary
Viability of stored Brachiaria decumbens seed was maintained at 80% to 90%.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Outcome
- viabilitye6
- Value
- 80% to 90%e6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e6“Further storage at 10 deg C and 29% RH up to 4 years 6 months did not result in increased germination in intact caryopses, although viability was maintained at 80% to 90%”
Claim · model-written summary
Scarification in concentrated sulfuric acid for 20 minutes increased germination of stored seed to 72%.
- Taxon
- Brachiaria decumbensUrochloa decumbense0
- Treatment
- Scarification in concentrated H(,2)SO(,4) for 20 minutese7
- Outcome
- germination of stored seede7
- Direction
- increasede7
- Value
- 72%e7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Germination of Brachiaria decumbens was shown to be controlled by two dormancy mechanisms”
e7“Scarification in concentrated H(,2)SO(,4) for 20 minutes increased germination of stored seed to 72%”
The same questions in other papers
sulfuric acid · growth · Urochloa decumbensPositive and negative results
2 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
1 paper more in this group
See all 5 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.