Abstract
Summary Wild oat plants of types fA, fB and fC were grown at a constant 15 or 20°C during the period of seed maturation. Seed of the three types differed little in dormancy when grown at 15°C, but at 20°C a larger proportion of seeds of type fA were dormant compared with fB or fC. Overall, dormancy of seed produced at 15 and 20°C was 97 and 63% respectively. Plants of another collection of type fB were grown from seed at 15 or 20°C with or without water stress applied only from the time of panicle emergence. Water stress and high temperature reduced viable seed production. Seed dormancy was tested immediately after collection by planting the seed in soil, and by Petri dish tests. Further Petri dish tests were made after 6 months storage. Seedling emergence in the first autumn from seeds of plants matured without water stress at 15°C was 10% compared with 30% for seeds grown at 20°C. Seeds grown with water stress at 15°C gave 47%, and at 20°C 78% emergence. The majority of emergence from seeds formed at 15°C without water stress occurred in the second spring after burial. Petri dish tests support these findings and suggest that seeds produced in hot dry summers are less dormant than those produced in cool moist ones.
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Claims 12
Claim · model-written summary
At 15°C the three wild oat types differed little in seed dormancy.
Verbatim
e0“Seed of the three types differed little in dormancy when grown at 15°C”
t0“wild oat”
Claim · model-written summary
At 20°C type fA had a larger dormant seed proportion than fB or fC.
Verbatim
e0“at 20°C a larger proportion of seeds of type fA were dormant compared with fB or fC”
t0“wild oat”
Claim · model-written summary
Overall dormancy was 97% for seed produced at 15°C.
Verbatim
e0“Overall, dormancy of seed produced at 15 and 20°C was 97 and 63% respectively”
t0“wild oat”
Claim · model-written summary
Overall dormancy was 63% for seed produced at 20°C.
Verbatim
e0“Overall, dormancy of seed produced at 15 and 20°C was 97 and 63% respectively”
t0“wild oat”
Claim · model-written summary
Water stress reduced viable seed production.
Not reportedComparator
Verbatim
e0“Water stress and high temperature reduced viable seed production”
t0“wild oat”
Claim · model-written summary
High temperature reduced viable seed production.
Not reportedComparator
Verbatim
e0“Water stress and high temperature reduced viable seed production”
t0“wild oat”
Claim · model-written summary
Without water stress, seed matured at 15°C had 10% first-autumn emergence.
Verbatim
e0“Seedling emergence in the first autumn from seeds of plants matured without water stress at 15°C was 10% compared with 30% for seeds grown at 20°C”
t0“wild oat”
Claim · model-written summary
Without water stress, seed matured at 20°C had 30% first-autumn emergence.
Verbatim
e0“Seedling emergence in the first autumn from seeds of plants matured without water stress at 15°C was 10% compared with 30% for seeds grown at 20°C”
t0“wild oat”
Claim · model-written summary
With water stress at 15°C, emergence was 47%.
Verbatim
e0“Seeds grown with water stress at 15°C gave 47%, and at 20°C 78% emergence”
t0“wild oat”
Claim · model-written summary
With water stress at 20°C, emergence was 78%.
Verbatim
e0“Seeds grown with water stress at 15°C gave 47%, and at 20°C 78% emergence”
t0“wild oat”
Claim · model-written summary
Most seed matured at 15°C without water stress emerged in the second spring after burial.
- Taxon
- wild oatt0
- Outcome
- emergence from seeds formed at 15°C without water stress occurred in the second spring after buriale0
Not reportedDirection
Verbatim
e0“The majority of emergence from seeds formed at 15°C without water stress occurred in the second spring after burial”
t0“wild oat”
Claim · model-written summary
Petri dish tests indicated seed from hot dry summers was less dormant than seed from cool moist summers.
Verbatim
e0“Petri dish tests support these findings and suggest that seeds produced in hot dry summers are less dormant than those produced in cool moist ones”
t0“wild oat”
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