Abstract
Canola is seeded when ambient temperatures are below the optimum. Therefore, we wished to determine whether certified seedlots displayed variation in low temperature germination potential and, thereafter, to study the effects of low temperature during germination and early seedling development. Canola ( Brassiea napus L. cv. Westar) seed was tested for germination potential at 22, 10, 6, and 2 °C. Two seedlots, designated L and H, which represented the extremes in germination potential at 10 °C, were chosen for further study. Under the optimal conditions of 22 °C the two seedlots exhibited similar germination rates and early seedling growth. At 10 °C, L reached 95% germination within 8 d and displayed rapid seedling growth. This was associated with high isocitrate lyase activities and rapid mobilization of total lipid and protein reserves. Seedlot H, at 10 °C, did not reach a high percentage of germination until Day 12, and seedling growth was slow relative to that of L. Seedlot H had more gradual increases in isocitrate lyase activity, mobidization of storage lipid, and protein mobilization at 10 °C. Both seedlots germinated poorly at 6 and 2 °C. At 6 °C, L displayed higher isocitrate lyase activity and higher rates of lipid and protein mobilization than H. From these studies we have determined that low temperature has a deleterious effect on the germination of canola and this may be reflected in a loss or a delay of coordination in the mobilization of reserves. In addition, differences within the Westar cultivar exist with respect to germination under low temperature.
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Claims 12
Claim · model-written summary
At 22 °C, seedlots had similar germination and early growth.
- Taxon
- Canola
.jpg?width=60)
Brassica napus var. napust0 - Material
- two seedlotse0
- Outcome
- germination rates and early seedling growthe0
- Direction
- similare0
- Qualifier
- 22 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Under the optimal conditions of 22 °C the two seedlots exhibited similar germination rates and early seedling growth”
t0“Canola”
Claim · model-written summary
At 10 °C, seedlot L reached 95% germination within eight days.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Le0
- Outcome
- germinatione0
- Value
- 95%e0
- Qualifier
- within 8 de0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 10 °C, L reached 95% germination within 8 d”
t0“Canola”
Claim · model-written summary
At 10 °C, seedlot L grew rapidly.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Lt1
- Outcome
- seedling growthe0
- Direction
- rapide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“displayed rapid seedling growth”
t0“Canola”
t1“Two seedlots, designated L and H”
Claim · model-written summary
Seedlot L had high isocitrate lyase activity and rapid reserve mobilization.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Lt1
- Gene
- isocitrate lyasee0
- Outcome
- isocitrate lyase activities and rapid mobilization of total lipid and protein reservese0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was associated with high isocitrate lyase activities and rapid mobilization of total lipid and protein reserves”
t0“Canola”
t1“Two seedlots, designated L and H”
Claim · model-written summary
At 10 °C, seedlot H reached high germination only by day 12.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Seedlot He0
- Outcome
- germinatione0
- Qualifier
- until Day 12e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlot H, at 10 °C, did not reach a high percentage of germination until Day 12”
t0“Canola”
Claim · model-written summary
Seedlot H grew slowly relative to L.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Seedlot Ht1
- Outcome
- seedling growthe0
- Direction
- slowe0
- Comparator
- Le0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling growth was slow relative to that of L”
t0“Canola”
t1“Seedlot H, at 10 °C”
Claim · model-written summary
At 10 °C, seedlot H showed gradual enzyme activity and reserve mobilization increases.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Seedlot He0
- Gene
- isocitrate lyasee0
- Outcome
- isocitrate lyase activity, mobidization of storage lipid, and protein mobilizatione0
- Direction
- more gradual increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlot H had more gradual increases in isocitrate lyase activity, mobidization of storage lipid, and protein mobilization at 10 °C”
t0“Canola”
Claim · model-written summary
Both seedlots germinated poorly at 6 and 2 °C.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Both seedlotse0
- Outcome
- germinated poorlye0
- Qualifier
- 6 and 2 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both seedlots germinated poorly at 6 and 2 °C”
t0“Canola”
Claim · model-written summary
At 6 °C, L had higher isocitrate lyase activity than H.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Le0
- Gene
- isocitrate lyasee0
- Outcome
- isocitrate lyase activitye0
- Direction
- highere0
- Comparator
- He0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 6 °C, L displayed higher isocitrate lyase activity and higher rates of lipid and protein mobilization than H”
t0“Canola”
Claim · model-written summary
At 6 °C, L had higher lipid and protein mobilization rates than H.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Le0
- Outcome
- rates of lipid and protein mobilizatione0
- Direction
- highere0
- Comparator
- He0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 6 °C, L displayed higher isocitrate lyase activity and higher rates of lipid and protein mobilization than H”
t0“Canola”
Claim · model-written summary
Low temperature harms canola germination.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- low temperaturee0
- Outcome
- germinatione0
- Direction
- deleterious effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“low temperature has a deleterious effect on the germination of canola”
Claim · model-written summary
Westar seedlots differ in low-temperature germination.
- Taxon
- CanolaBrassica napus var. napust0
- Material
- Westare0
- Outcome
- germination under low temperaturee0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“differences within the Westar cultivar exist with respect to germination under low temperature”
t0“Canola”
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