Abstract
Controlling expression of IPT, a gene encoding isopentenyltransferase (the enzyme that catalyzes the rate-limiting step in cytokinin biosynthesis), with a senescence-specific promoter results in the suppression of leaf senescence. Transgenic tobacco plants expressing this chimeric gene do not exhibit the developmental abnormalities usually associated with IPT expression because the system is autoregulatory. Because sufficient cytokinin is produced to retard senescence, the activity of the senescence-specific promoter is attenulated. Senescence-retarded leaves exhibit a prolonged, photosythetically active life-span. This result demonstrates that endogenously produced cytokinin can regulate senescence and provides a system to specifically manipulate the senescence program.
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Claims 4
Claim · model-written summary
Senescence-promoter controlled IPT expression suppressed leaf senescence in tobacco.
- Taxon
- tobacco
Nicotiana tabacumt0 - Treatment
- Controlling expression of IPTe0
- Gene
- IPTe0
- Outcome
- leaf senescencee0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Controlling expression of IPT, a gene encoding isopentenyltransferase (the enzyme that catalyzes the rate-limiting step in cytokinin biosynthesis), with a senescence-specific promoter results in the suppression of leaf senescence.”
t0“Transgenic tobacco plants”
Claim · model-written summary
Transgenic tobacco plants with the autoregulated IPT construct lacked the usual developmental abnormalities associated with IPT expression.
- Taxon
- tobaccoNicotiana tabacume0
- Gene
- IPTe0
- Outcome
- developmental abnormalitiese0
- Direction
- do not exhibite0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transgenic tobacco plants expressing this chimeric gene do not exhibit the developmental abnormalities usually associated with IPT expression because the system is autoregulatory.”
Claim · model-written summary
Cytokinin production attenuated activity of the senescence-specific promoter as senescence was retarded.
Not reportedTaxon
Verbatim
e0“Because sufficient cytokinin is produced to retard senescence, the activity of the senescence-specific promoter is attenulated.”
Claim · model-written summary
Senescence-retarded tobacco leaves had a prolonged photosynthetically active life span.
- Taxon
- tobaccoNicotiana tabacumt0
- Organ / stage
- leavese0
- Outcome
- photosythetically active life-spane0
- Direction
- prolongede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Senescence-retarded leaves exhibit a prolonged, photosythetically active life-span.”
t0“Transgenic tobacco plants”
The same questions in other papers
transgenic · quality: postharvest · Nicotiana tabacum (tobacco)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- positive
- negative
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.