Abstract
The plant hormone abscisic acid (ABA) has been implicated in the inception and maintenance of seed dormancy, while gibberellins promote dormancy breakage and germination in some species. We investigated whether osmotic stress induced secondary dormancy in Brassica napus L. is associated with changes in ABA sensitivity and metabolism, as well as changes in gibberellin levels. Seeds of two genotypes, one with low dormancy potential (LDP) and one with high dormancy potential (HDP) for secondary dormancy, were exposed to a dormancy-inducing osmotic treatment for up to 4 weeks and then germinated in the presence of increasing ABA concentrations. Even at relatively high concentrations of supplied ABA, germination of LDP seed was not inhibited, while relatively low ABA concentrations inhibited the germination of HDP seed after osmotic treatment. Fluridone was highly effective in suppressing secondary dormancy development in HDP seed, but had no effect on germinability in LDP seed. Despite the lack of differences in nonosmotically treated seed, ABA and ABA-glucose ester accumulated to higher levels, and gibberellin A 1 accumulated to lower levels, in HDP relative to LDP seed by the end of the osmotic treatment. Our findings indicate an association among ABA sensitivity, biosynthesis and accumulation, and secondary dormancy potential in B. napus seed.Key words: abscisic acid (ABA), Brassica napus, fluridone, induced dormancy, osmotic stress, sensitivity.
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Claims 7
Claim · model-written summary
High supplied ABA did not inhibit germination of low dormancy potential seed.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Material
- LDPe0
- Organ / stage
- seede0
- Treatment
- relatively high concentrations of supplied ABAe0
- Outcome
- germination of LDP seede0
- Direction
- not inhibitede0
- Comparator
- HDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“Even at relatively high concentrations of supplied ABA, germination of LDP seed was not inhibited, while relatively low ABA concentrations inhibited the germination of HDP seed after osmotic treatment.”
t0“Brassica napus”
Claim · model-written summary
Low ABA concentrations inhibited germination of high dormancy potential seed after osmotic treatment.
- Taxon
- Brassica napusBrassica napust0
- Material
- HDPe0
- Organ / stage
- seede0
- Treatment
- relatively low ABA concentrationse0
- Outcome
- germination of HDP seede0
- Direction
- inhibitede0
- Comparator
- LDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Even at relatively high concentrations of supplied ABA, germination of LDP seed was not inhibited, while relatively low ABA concentrations inhibited the germination of HDP seed after osmotic treatment.”
t0“Brassica napus”
Claim · model-written summary
Fluridone suppressed secondary dormancy development in HDP seed.
- Taxon
- Brassica napusBrassica napust0
- Material
- HDPe0
- Treatment
- Fluridonee0
- Outcome
- secondary dormancy developmente0
- Direction
- suppressinge0
- Comparator
- LDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluridone was highly effective in suppressing secondary dormancy development in HDP seed, but had no effect on germinability in LDP seed.”
t0“Brassica napus”
Claim · model-written summary
Fluridone had no effect on LDP seed germinability.
- Taxon
- Brassica napusBrassica napust0
- Material
- LDPe0
- Treatment
- Fluridonee0
- Outcome
- germinability in LDP seede0
- Direction
- no effecte0
- Comparator
- HDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fluridone was highly effective in suppressing secondary dormancy development in HDP seed, but had no effect on germinability in LDP seed.”
t0“Brassica napus”
Claim · model-written summary
ABA and ABA-glucose ester accumulated to higher levels in HDP than LDP seed after osmotic treatment.
- Taxon
- Brassica napusBrassica napust0
- Material
- HDPe0
- Organ / stage
- seede0
- Treatment
- osmotic treatmente0
- Outcome
- ABA and ABA-glucose estere0
- Direction
- higher levelse0
- Comparator
- LDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Despite the lack of differences in nonosmotically treated seed, ABA and ABA-glucose ester accumulated to higher levels, and gibberellin A 1 accumulated to lower levels, in HDP relative to LDP seed by the end of the osmotic treatment.”
t0“Brassica napus”
Claim · model-written summary
Gibberellin A 1 accumulated to lower levels in HDP than LDP seed after osmotic treatment.
- Taxon
- Brassica napusBrassica napust0
- Material
- HDPe0
- Organ / stage
- seede0
- Treatment
- osmotic treatmente0
- Outcome
- gibberellin A 1e0
- Direction
- lower levelse0
- Comparator
- LDP seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Despite the lack of differences in nonosmotically treated seed, ABA and ABA-glucose ester accumulated to higher levels, and gibberellin A 1 accumulated to lower levels, in HDP relative to LDP seed by the end of the osmotic treatment.”
t0“Brassica napus”
Claim · model-written summary
ABA sensitivity, biosynthesis and accumulation were associated with secondary dormancy potential.
- Taxon
- B. napusBrassica napuse0
- Organ / stage
- seede0
- Compound
- ABAe0
- Outcome
- secondary dormancy potentiale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our findings indicate an association among ABA sensitivity, biosynthesis and accumulation, and secondary dormancy potential in B. napus seed.”
The same questions in other papers
Fluridone · growth · Brassica napus (oilseed rape)Positive and negative results
2 in the opposite direction
- negative
- negative
(+)-abscisic acid · growth · Brassica napus (oilseed rape)Positive and negative results
3 papers in the same direction as this paper · 9 in the opposite direction
- negative
- positive
- positive
9 papers more in this group
See all 13 papers →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.