Abstract
Gene StGA20ox1 encoding potato GA 20-oxidase is expressed to relatively high levels in leaves and regulated by daylength. To investigate whether this gene is involved in photoperiodic regulation of tuber formation, we have obtained transgenic potato plants expressing sense and antisense copies of the StGA20ox1 cDNA. Over-expression of this cDNA resulted in taller plants that required a longer duration of a short day photoperiod (SD) to tuberize. Tubers from these plants had a decreased time of dormancy and developed sprouts with elongated internodes. Plants expressing antisense copies of the StGA20ox1 cDNA had shorter stems, a decreased length of the internodes and tuberized earlier than control plants, showing increased tuber yields. Antisense inhibition of this gene had no visible effect on the time of dormancy of the tubers, although at the end of dormancy these formed sprouts with shortened internodes. Decreased levels of endogenous GA20 and GA1 were detected in the apex and first leaves of the antisense lines. These results demonstrate the involvement of the GA 20-oxidase activity encoded by StGA20ox1 in the control of stem elongation and in tuber induction but not in tuber dormancy, indicating that the latter may be regulated by another member of the gene family.
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Claims 11
Claim · model-written summary
StGA20ox1 expression is relatively high in leaves and regulated by daylength.
- Taxon
- potato
Solanum tuberosume0 - Organ / stage
- leavese0
- Gene
- StGA20ox1e0
- Outcome
- expressed to relatively high levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gene StGA20ox1 encoding potato GA 20-oxidase is expressed to relatively high levels in leaves and regulated by daylength.”
Claim · model-written summary
Overexpression produced taller potato plants.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Over-expression of this cDNAe0
- Outcome
- taller plantse0
- Direction
- tallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over-expression of this cDNA resulted in taller plants”
t0“potato plants”
Claim · model-written summary
Overexpression prolonged the short-day duration needed for tuberization.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- duration of a short day photoperiod (SD) to tuberizee0
- Direction
- longere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“required a longer duration of a short day photoperiod (SD) to tuberize”
t0“potato plants”
Claim · model-written summary
Tubers of overexpressing plants had shorter dormancy.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- time of dormancye0
- Direction
- decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tubers from these plants had a decreased time of dormancy”
t0“potato plants”
Claim · model-written summary
Tubers of overexpressing plants developed sprouts with elongated internodes.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- sprouts with elongated internodese0
- Direction
- elongatede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“developed sprouts with elongated internodes”
t0“potato plants”
Claim · model-written summary
Antisense plants had shorter stems and internodes than controls.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- expressing antisense copies of the StGA20ox1 cDNAe0
- Outcome
- shorter stems, a decreased length of the internodese0
- Direction
- shortere0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants expressing antisense copies of the StGA20ox1 cDNA had shorter stems, a decreased length of the internodes and tuberized earlier than control plants”
t0“potato plants”
Claim · model-written summary
Antisense plants tuberized earlier than controls.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- tuberizede0
- Direction
- earliere0
- Comparator
- control plantse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tuberized earlier than control plants”
t0“potato plants”
Claim · model-written summary
Antisense plants had increased tuber yields.
- Taxon
- potatoSolanum tuberosumt0
- Outcome
- tuber yieldse0
- Direction
- increasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showing increased tuber yields”
t0“potato plants”
Claim · model-written summary
Antisense inhibition had no visible effect on tuber dormancy time.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- Antisense inhibition of this genee0
- Outcome
- time of dormancy of the tuberse0
- Direction
- no visible effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Antisense inhibition of this gene had no visible effect on the time of dormancy of the tubers”
t0“potato plants”
Claim · model-written summary
Antisense tubers formed sprouts with shortened internodes at dormancy end.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- end of dormancye0
- Outcome
- sprouts with shortened internodese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at the end of dormancy these formed sprouts with shortened internodes”
t0“potato plants”
Claim · model-written summary
Antisense lines had decreased endogenous GA20 and GA1 in apex and first leaves.
- Taxon
- potatoSolanum tuberosumt0
- Organ / stage
- apex and first leavese0
- Treatment
- antisense linese0
- Outcome
- levels of endogenous GA20 and GA1e0
- Direction
- Decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreased levels of endogenous GA20 and GA1 were detected in the apex and first leaves of the antisense lines.”
t0“potato plants”
The same questions in other papers
loss of function · growth · Solanum tuberosum (potato)Positive and negative results
8 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
7 papers more in this group
See all 11 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.