Abstract
In roses, light is a central environmental factor controlling bud break and involves a stimulation of sugar metabolism. Very little is known about the role of sucrose transporters in the bud break process and its regulation by light. In this study, we show that sugar promotes rose bud break and that bud break is accompanied by an import of sucrose. Radio-labelled sucrose accumulation is higher in buds exposed to light than to darkness and involves an active component. Several sucrose transporter (RhSUC1, 2, 3 and 4) transcripts are expressed in rose tissues, but RhSUC2 transcript level is the only one induced in buds exposed to light after removing the apical dominance. RhSUC2 is preferentially expressed in bursting buds and stems. Functional analyses in baker's yeast demonstrate that RhSUC2 encodes a sucrose/proton co-transporter with a K(m) value of 2.99 mm at pH 4.5 and shows typical features of sucrose symporters. We therefore propose that bud break photocontrol partly depends upon the modulation of sucrose import into buds by RhSUC2.
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Claims 10
Claim · model-written summary
Sugar promoted rose bud break.
Not reportedComparator
Verbatim
e0“sugar promotes rose bud break”
Claim · model-written summary
Bud break was accompanied by sucrose import.
RosaNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bud break is accompanied by an import of sucrose”
t0“Rosa sp.”
Claim · model-written summary
Light increased radio-labelled sucrose accumulation in buds relative to darkness.
- Organ / stage
- budse0
- Treatment
- lighte0
- Outcome
- Radio-labelled sucrose accumulatione0
- Direction
- highere0
- Comparator
- darknesse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radio-labelled sucrose accumulation is higher in buds exposed to light than to darkness and involves an active component”
t0“Rosa sp.”
Claim · model-written summary
Radio-labelled sucrose accumulation in buds involved an active component.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Radio-labelled sucrose accumulation is higher in buds exposed to light than to darkness and involves an active component”
t0“Rosa sp.”
Claim · model-written summary
RhSUC1, RhSUC2, RhSUC3 and RhSUC4 transcripts were expressed in rose tissues.
Verbatim
e0“Several sucrose transporter (RhSUC1, 2, 3 and 4) transcripts are expressed in rose tissues”
Claim · model-written summary
RhSUC2 alone was induced in light-exposed buds after apical dominance removal.
- Organ / stage
- budse0
- Treatment
- light after removing the apical dominancee0
- Gene
- RhSUC2e0
- Outcome
- transcript levele0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RhSUC2 transcript level is the only one induced in buds exposed to light after removing the apical dominance”
t0“Rosa sp.”
Claim · model-written summary
RhSUC2 was preferentially expressed in bursting buds and stems.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RhSUC2 is preferentially expressed in bursting buds and stems”
t0“Rosa sp.”
Claim · model-written summary
RhSUC2 encoded a sucrose/proton co-transporter.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RhSUC2 encodes a sucrose/proton co-transporter with a K(m) value of 2.99 mm at pH 4.5”
t0“Rosa sp.”
Claim · model-written summary
RhSUC2 showed typical sucrose symporter features.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RhSUC2 encodes a sucrose/proton co-transporter with a K(m) value of 2.99 mm at pH 4.5 and shows typical features of sucrose symporters”
t0“Rosa sp.”
Claim · model-written summary
Bud break light control was proposed to depend partly on RhSUC2 modulation of sucrose import.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“bud break photocontrol partly depends upon the modulation of sucrose import into buds by RhSUC2”
t0“Rosa sp.”
The same questions in other papers
light · molecular: metabolites · RosaPositive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
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.