Abstract
Broccoli (Brassica oleracea L. cv Italica) florets senesced rapidly after harvest at ambient temperatures. During senescence at 20°C, the rate of ethylene production of florets significantly increased, concurrent with a rapid yellowing of sepals ascribed to chlorophyll degradation. 1-Aminocyclopropane-1-carboxylic acid (ACC) oxidase activity in florets also rapidly increased to a peak ; the enzyme activity then declined sharply, paralleling the increased pattern of ethylene production. Treatment of florets with 1 mM methyl jasmonate (MJ) significantly promoted ethylene production and ACC oxidase activity during senescence, attaining a higher peak faster than the control. Chlorophyll loss and a concurrent enhancement of ACC synthase activity by exogenous 1 mM MJ were accelerated to a greater extent than those of the control. The rise in ethylene production was reduced and delayed by treatment with 10 mM diethyldithiocarbamate (DIECA) that is thought to be an inhibitor of jasmonate biosynthesis. These results suggest that jasmonates may be associated with promoting senescence by enhancing ethylene production in broccoli florets.
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Claims 9
Claim · model-written summary
Broccoli florets senesced rapidly after harvest.
- Taxon
- Broccoli
Brassica oleracea var. italicae0 - Organ / stage
- floretse0
- Outcome
- senesced rapidlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broccoli (Brassica oleracea L. cv Italica) florets senesced rapidly after harvest at ambient temperatures”
Claim · model-written summary
Ethylene production significantly increased during senescence.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Outcome
- rate of ethylene productione0
- Direction
- increasede0
- Setting
- 20°Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During senescence at 20°C, the rate of ethylene production of florets significantly increased”
t0“Broccoli”
Claim · model-written summary
Sepals rapidly yellowed during senescence.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Organ / stage
- sepalse0
- Outcome
- yellowing of sepalse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid yellowing of sepals ascribed to chlorophyll degradation”
t0“Broccoli”
Claim · model-written summary
ACC oxidase activity rose to a peak and then declined sharply.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Gene
- 1-Aminocyclopropane-1-carboxylic acid (ACC) oxidasee0
- Outcome
- oxidase activitye0
- Direction
- rapidly increased to a peake0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“1-Aminocyclopropane-1-carboxylic acid (ACC) oxidase activity in florets also rapidly increased to a peak ; the enzyme activity then declined sharply”
t0“Broccoli”
Claim · model-written summary
Methyl jasmonate promoted ethylene production and ACC oxidase activity.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- 1 mM methyl jasmonate (MJ)e0
- Outcome
- ethylene production and ACC oxidase activitye0
- Direction
- promotede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of florets with 1 mM methyl jasmonate (MJ) significantly promoted ethylene production and ACC oxidase activity during senescence, attaining a higher peak faster than the control”
t0“Broccoli”
Claim · model-written summary
Methyl jasmonate accelerated chlorophyll loss.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- 1 mM MJe0
- Outcome
- Chlorophyll losse0
- Direction
- acceleratede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll loss and a concurrent enhancement of ACC synthase activity by exogenous 1 mM MJ were accelerated to a greater extent than those of the control”
t0“Broccoli”
Claim · model-written summary
Methyl jasmonate enhanced ACC synthase activity.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- 1 mM MJe0
- Outcome
- ACC synthase activitye0
- Direction
- enhancemente0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyll loss and a concurrent enhancement of ACC synthase activity by exogenous 1 mM MJ were accelerated to a greater extent than those of the control”
t0“Broccoli”
Claim · model-written summary
DIECA reduced and delayed the rise in ethylene production.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- 10 mM diethyldithiocarbamate (DIECA)e0
- Outcome
- rise in ethylene productione0
- Direction
- reduced and delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rise in ethylene production was reduced and delayed by treatment with 10 mM diethyldithiocarbamate (DIECA)”
t0“Broccoli”
Claim · model-written summary
Jasmonates may promote senescence through enhanced ethylene production.
- Taxon
- broccoliBrassica oleracea var. italicae0
- Compound
- jasmonatese0
- Outcome
- senescencee0
- Qualifier
- enhancing ethylene productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“jasmonates may be associated with promoting senescence by enhancing ethylene production in broccoli florets”
The same questions in other papers
(-)-methyl jasmonate · physiology: enzyme activity · Brassica oleracea (wild cabbage)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
(-)-methyl jasmonate · physiology: hormones · Brassica oleracea (wild cabbage)Results agree
1 paper in the same direction as this paper
- negative
(-)-methyl jasmonate · physiology: pigments · Brassica oleracea (wild cabbage)Results agree
1 paper in the same direction as this paper
- 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.