Abstract
Seed dormancy has an important role in resistance and survival mechanisms of plants. Finding of some information about the range of primary dormancy and effective factors in dormancy breaking and optimal conditions of seed germination are necessary for weed control and other research purposes. In this research, the seeds of 10 species of grass weeds in Tehran province fields (Echinocloa crus-galli, Bromus tectorum, B. dantoniae, Hordeum glaucum, Setaria viridis, S. glauca, S. verticillata, Elymus repens, Phalaris minor and Sorghum halepense) have been studied. The results showed that seeds of all the species had high viability. The effects of some chemical, mechanical and temporal factors on seed dormancy breaking have been studied. Light had an inhibitory effect only in seed germination of Bromus spp. and H. glaucum and promoted germination in other species. Main factor of dormancy in all the species was in seed coat and pericarp. Of course there was a little of dormancy in embryo in some of them but B. dantoniae, S. halepense, E. repens and S. viridis specially had deep dormancy in embryo. Two different collected types of Ph. minor, had different primary dormancy in their seeds.
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Claims 7
Claim · model-written summary
Seeds of all ten grass weed species had high viability.
Verbatim
e0“seeds of all the species had high viability”
t0“grass weeds”
Claim · model-written summary
Light inhibited germination in Bromus species and H. glaucum.
- Taxon
- Bromus spp. and H. glaucum
Bromus
Hordeum murinum subsp. glaucume0 - Treatment
- Lighte0
- Outcome
- seed germinatione0
- Direction
- inhibitorye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light had an inhibitory effect only in seed germination of Bromus spp. and H. glaucum”
Claim · model-written summary
Light promoted germination in the other species.
Not reportedComparator
Verbatim
e0“promoted germination in other species”
t0“grass weeds”
t1“Light had an inhibitory effect only in seed germination”
Claim · model-written summary
Seed coat and pericarp were the main dormancy factor in all species.
Verbatim
e0“Main factor of dormancy in all the species was in seed coat and pericarp”
t0“grass weeds”
Claim · model-written summary
Some species had a little embryo dormancy.
Verbatim
e0“there was a little of dormancy in embryo in some of them”
t0“grass weeds”
Claim · model-written summary
B. dantoniae, S. halepense, E. repens and S. viridis had deep embryo dormancy.
Verbatim
e0“B. dantoniae, S. halepense, E. repens and S. viridis specially had deep dormancy in embryo”
Claim · model-written summary
Two collected Ph. minor types differed in primary seed dormancy.
Verbatim
e0“Two different collected types of Ph. minor, had different primary dormancy in their seeds”
The same questions in other papers
light · growth · BromusPositive and negative results
1 in the opposite direction
- positive
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.