Abstract
An analysis of changes in global gene expression patterns during developmental leaf senescence in Arabidopsis has identified more than 800 genes that show a reproducible increase in transcript abundance. This extensive change illustrates the dramatic alterations in cell metabolism that underpin the developmental transition from a photosynthetically active leaf to a senescing organ which functions as a source of mobilizable nutrients. Comparison of changes in gene expression patterns during natural leaf senescence with those identified, when senescence is artificially induced in leaves induced to senesce by darkness or during sucrose starvation-induced senescence in cell suspension cultures, has shown not only similarities but also considerable differences. The data suggest that alternative pathways for essential metabolic processes such as nitrogen mobilization are used in different senescent systems. Gene expression patterns in the senescent cell suspension cultures are more similar to those for dark-induced senescence and this may be a consequence of sugar starvation in both tissues. Gene expression analysis in senescing leaves of plant lines defective in signalling pathways involving salicylic acid (SA), jasmonic acid (JA) and ethylene has shown that these three pathways are all required for expression of many genes during developmental senescence. The JA/ethylene pathways also appear to operate in regulating gene expression in dark-induced and cell suspension senescence whereas the SA pathway is not involved. The importance of the SA pathway in the senescence process is illustrated by the discovery that developmental leaf senescence, but not dark-induced senescence, is delayed in plants defective in the SA pathway.
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Claims 8
Claim · model-written summary
More than 800 Arabidopsis genes reproducibly increased transcript abundance during leaf senescence.
- Taxon
- Arabidopsis
Arabidopsise0 - Organ / stage
- leaf senescencee0
- Outcome
- transcript abundancee0
- Direction
- increasee0
- Value
- more than 800 genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An analysis of changes in global gene expression patterns during developmental leaf senescence in Arabidopsis has identified more than 800 genes that show a reproducible increase in transcript abundance.”
Claim · model-written summary
Natural, dark induced and sucrose starvation senescence have both similar and different expression patterns.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- gene expression patternse0
- Qualifier
- similarities but also considerable differencese0
- Comparator
- natural leaf senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Comparison of changes in gene expression patterns during natural leaf senescence with those identified, when senescence is artificially induced in leaves induced to senesce by darkness or during sucrose starvation-induced senescence in cell suspension cultures, has shown not only similarities but also considerable differences.”
t0“Arabidopsis”
Claim · model-written summary
Senescent culture expression more closely resembles dark induced senescence.
- Taxon
- ArabidopsisArabidopsist0
- Outcome
- Gene expression patternse0
- Direction
- more similare0
- Comparator
- dark-induced senescencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gene expression patterns in the senescent cell suspension cultures are more similar to those for dark-induced senescence”
t0“Arabidopsis”
Claim · model-written summary
SA, JA and ethylene pathways are required for many genes during developmental senescence.
- Taxon
- ArabidopsisArabidopsist0
- Compound
- salicylic acid (SA), jasmonic acid (JA) and ethylenee0
- Outcome
- expression of many genese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“signalling pathways involving salicylic acid (SA), jasmonic acid (JA) and ethylene has shown that these three pathways are all required for expression of many genes during developmental senescence.”
t0“Arabidopsis”
Claim · model-written summary
JA and ethylene appear to regulate expression in dark induced and culture senescence.
- Taxon
- ArabidopsisArabidopsist0
- Compound
- JA/ethylenee0
- Outcome
- gene expressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The JA/ethylene pathways also appear to operate in regulating gene expression in dark-induced and cell suspension senescence whereas the SA pathway is not involved.”
t0“Arabidopsis”
Claim · model-written summary
SA does not appear involved in dark induced and culture senescence expression.
- Taxon
- ArabidopsisArabidopsist0
- Compound
- SAe0
- Outcome
- gene expressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The JA/ethylene pathways also appear to operate in regulating gene expression in dark-induced and cell suspension senescence whereas the SA pathway is not involved.”
t0“Arabidopsis”
Claim · model-written summary
SA pathway defects delay developmental leaf senescence.
- Taxon
- plantsViridiplantaee0
- Outcome
- developmental leaf senescencee0
- Direction
- delayede0
- Qualifier
- defective in the SA pathwaye0
Verbatim
e0“developmental leaf senescence, but not dark-induced senescence, is delayed in plants defective in the SA pathway.”
Claim · model-written summary
SA pathway defects do not delay dark induced senescence.
- Taxon
- plantsViridiplantaee0
- Outcome
- dark-induced senescencee0
- Direction
- not dark-induced senescencee0
- Qualifier
- defective in the SA pathwaye0
Verbatim
e0“developmental leaf senescence, but not dark-induced senescence, is delayed in plants defective in the SA pathway.”