Abstract
Water and heat stressors during flowering are predominant limitations of dryland sorghum yields across Australia’s north-eastern cropping zone. Crops sown early could flower before seasonal heatwaves, but the seed must uniformly germination and emerge at soil temperatures between approximately 10 to 15 °C. Furthermore, chemical coatings applied to commercial hybrid seed lots effectively protected the developing crop from pest, disease and herbicide damage but the combined influence of low temperatures and seed coatings on germination of hybrid sorghum seed batches is unknown. In this experiment, germination dynamics were modelled for 10 commercial sorghum hybrid-seed lots (with or without seed coating of a.i. thiamethoxam, oxabetrinil and thiram) incubated at continuous temperatures ranging from 9.4 to 46.1 °C. Results also show commercial seed treatments negatively affect final germination proportion especially at sub- and supra-optimal temperatures. Some hybrid-seed lots in current experiment were more sensitive to seed coatings at either sub- or supra-optimal temperatures regardless of seed germination capability (i.e., germination proportion at 25 °C). Seeds took 5 days to reach 50% germination (t50) at 9.4 °C but germinated within 24 h at constant temperatures between 20 and 40 °C. The spread of germination (time between 10 and 90% germination) increased from 0.5 days at 30 °C to 3.8 days at 9.4 °C. Therefore, some hybrid-seedlots are suited to early sowing because they can maintain high germination proportion (>90%) even at soil temperatures (9.4 °C) as long as the seedbed remains moist for a least 12 days. Research continues identify the basis of cold tolerance in some-hybrid seedlots.
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Claims 7
Claim · model-written summary
Commercial seed treatments reduced final sorghum germination, especially at suboptimal and supraoptimal temperatures.
- Treatment
- commercial seed treatmentse0
- Outcome
- final germination proportione0
- Direction
- negatively affecte0
- Qualifier
- sub- and supra-optimal temperaturese0
SorghumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“commercial seed treatments negatively affect final germination proportion especially at sub- and supra-optimal temperatures”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
Some sorghum hybrid seed lots were more sensitive to coatings at suboptimal or supraoptimal temperatures irrespective of germination at 25 °C.
- Material
- hybrid-seed lotse0
- Treatment
- seed coatingse0
- Outcome
- sensitive to seed coatingse0
- Direction
- more sensitivee0
- Qualifier
- at either sub- or supra-optimal temperaturese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some hybrid-seed lots in current experiment were more sensitive to seed coatings at either sub- or supra-optimal temperatures regardless of seed germination capability (i.e., germination proportion at 25 °C)”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
Sorghum seeds took five days to reach half germination at 9.4 °C.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seeds took 5 days to reach 50% germination (t50) at 9.4 °C”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
Sorghum seeds germinated within 24 hours at 20 to 40 °C.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“germinated within 24 h at constant temperatures between 20 and 40 °C”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
The sorghum germination spread increased from 0.5 days at 30 °C to 3.8 days at 9.4 °C.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The spread of germination (time between 10 and 90% germination) increased from 0.5 days at 30 °C to 3.8 days at 9.4 °C”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
Some sorghum hybrid seed lots maintained over 90% germination at 9.4 °C when seedbeds stayed moist for at least 12 days.
- Material
- hybrid-seedlotse0
- Outcome
- germination proportione0
- Value
- >90%e0
- Qualifier
- as long as the seedbed remains moist for a least 12 dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some hybrid-seedlots are suited to early sowing because they can maintain high germination proportion (>90%) even at soil temperatures (9.4 °C) as long as the seedbed remains moist for a least 12 days”
t0“Sorghum (Sorghum bicolour L.)”
Claim · model-written summary
The authors consider some sorghum hybrid seed lots suitable for early sowing.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some hybrid-seedlots are suited to early sowing”
t0“Sorghum (Sorghum bicolour L.)”
The same questions in other papers
seed treatment · growth · SorghumPositive and negative results
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