Abstract
We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant. Without low temperature pretreatment, best germination occurred with continuous fluorescent light, a KNO 3 substratum, and an alternating 20 to 35 C temperature regime. Pretreatment of the seeds for 2 weeks at 10 C, followed by a temperature shift to 40 C for 2 hr was effective in breaking seed dormancy. Germination of each of 12 ecotypes, from harvests in each of 2 years, was markedly similar. Interpretation of the evidence suggests that seed dormancy is largely imposed by the relative degree of mechanical restriction afforded by the seed coat.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 5
Claim · model-written summary
Seeds of most johnsongrass ecotypes were highly dormant.
- Taxon
- johnsongrass
.jpg?width=60)
Sorghum halepensee0 - Material
- vegetative ecotypese0
- Organ / stage
- Seedse0
- Outcome
- highly dormante0
- Qualifier
- most ecotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant”
Claim · model-written summary
Continuous fluorescent light, a KNO3 substratum and an alternating 20 to 35 C temperature regime gave the best germination without low temperature pretreatment.
- Taxon
- johnsongrassSorghum halepensee0
- Treatment
- continuous fluorescent light, a KNO 3 substratum, and an alternating 20 to 35 C temperature regimee1
- Outcome
- germinatione1
- Direction
- beste1
- Comparator
- Without low temperature pretreatmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant”
e1“Without low temperature pretreatment, best germination occurred with continuous fluorescent light, a KNO 3 substratum, and an alternating 20 to 35 C temperature regime”
Claim · model-written summary
Two weeks at 10 C followed by a shift to 40 C for 2 hr was effective in breaking seed dormancy.
- Taxon
- johnsongrassSorghum halepensee0
- Treatment
- Pretreatment of the seeds for 2 weeks at 10 C, followed by a temperature shift to 40 C for 2 hre2
- Outcome
- seed dormancye2
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant”
e2“Pretreatment of the seeds for 2 weeks at 10 C, followed by a temperature shift to 40 C for 2 hr was effective in breaking seed dormancy”
Claim · model-written summary
Germination was markedly similar among the 12 ecotypes harvested in each of 2 years.
- Taxon
- johnsongrassSorghum halepensee0
- Material
- each of 12 ecotypese3
- Outcome
- Germinatione3
- Direction
- markedly similare3
- Qualifier
- from harvests in each of 2 yearse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant”
e3“Germination of each of 12 ecotypes, from harvests in each of 2 years, was markedly similar”
Claim · model-written summary
Seed dormancy is largely imposed by the relative degree of mechanical restriction afforded by the seed coat.
- Taxon
- johnsongrassSorghum halepensee0
- Outcome
- seed dormancye4
- Qualifier
- relative degree of mechanical restriction afforded by the seed coate4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We studied germination of seeds of 44 morphologically distinct, vegetative ecotypes of johnsongrass ( Sorghum halepense (L.) Pers.). Seeds of most ecotypes were highly dormant”
e4“Interpretation of the evidence suggests that seed dormancy is largely imposed by the relative degree of mechanical restriction afforded by the seed coat”