Abstract
Gluconeogenesis in Citrullus lanatus seeds is a post germinative event. Increases in isocitrate lyase activity and incorporation of radioactivity from [2-(14)C]acetate into sugars occur only after radicle emergence. During germination, the seeds appear to rely on carbohydrate as the respiratory substrate. At this time, glycolysis, the pentose phosphate pathway, and the tricarbocyclic acid cycle seem to be functional. Utilization of raffinose during germination appears to be important.Water stress, which completely inhibits germination, has a marked effect on carbohydrate metabolism. The rate of (14)CO(2) release from [2-(14)C]acetate, [1-(14)C]glucose, and [6-(14)C]glucose is lower in the stressed seeds than the control seeds during the respiratory lag phase. However, in the stressed seeds neither glycolysis, the pentose phosphate pathway, nor the tricarboxylic acid cycle is completely inhibited. In contrast to the control seeds in which raffinose content sharply declines after 12 h of incubation, raffinose content in the stressed seeds remains fairly constant.The respiratory lag phase of the control seeds coincides with a lower reducing substance content, glucose content, and fructose content than in the stressed seeds during the corresponding incubation period.
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Claims 11
Claim · model-written summary
Gluconeogenesis in Citrullus seeds occurs after germination.
- Taxon
- Citrullus lanatus
Citrullus lanatuse0 - Organ / stage
- seedse0
- Outcome
- post germinative evente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gluconeogenesis in Citrullus lanatus seeds is a post germinative event.”
Claim · model-written summary
Isocitrate lyase activity increases only after radicle emergence.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Organ / stage
- radicle emergencee0
- Gene
- isocitrate lyasee0
- Outcome
- isocitrate lyase activitye0
- Direction
- Increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in isocitrate lyase activity and incorporation of radioactivity from [2-(14)C]acetate into sugars occur only after radicle emergence.”
t0“Citrullus lanatus”
Claim · model-written summary
Acetate incorporation into sugars increases only after radicle emergence.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Outcome
- incorporation of radioactivity from [2-(14)C]acetate into sugarse0
- Direction
- Increasese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increases in isocitrate lyase activity and incorporation of radioactivity from [2-(14)C]acetate into sugars occur only after radicle emergence.”
t0“Citrullus lanatus”
Claim · model-written summary
Germinating seeds appear to use carbohydrate as respiratory substrate.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Organ / stage
- germinatione0
- Outcome
- rely on carbohydrate as the respiratory substratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During germination, the seeds appear to rely on carbohydrate as the respiratory substrate.”
t0“Citrullus lanatus”
Claim · model-written summary
Glycolysis, the pentose phosphate pathway and the tricarbocyclic acid cycle seem functional during germination.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Outcome
- glycolysis, the pentose phosphate pathway, and the tricarbocyclic acid cycle seem to be functionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At this time, glycolysis, the pentose phosphate pathway, and the tricarbocyclic acid cycle seem to be functional.”
t0“Citrullus lanatus”
Claim · model-written summary
Raffinose utilization appears important in germination.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Outcome
- Utilization of raffinose during germinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Utilization of raffinose during germination appears to be important.”
t0“Citrullus lanatus”
Claim · model-written summary
Water stress completely inhibited Citrullus germination.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Treatment
- Water stresse0
- Outcome
- germinatione0
- Direction
- completely inhibitse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water stress, which completely inhibits germination, has a marked effect on carbohydrate metabolism.”
t0“Citrullus lanatus”
Claim · model-written summary
Water stress lowered carbon dioxide release from acetate and two glucose tracers during respiratory lag.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Treatment
- stressed seedse0
- Outcome
- rate of (14)CO(2) releasee0
- Direction
- lowere0
- Comparator
- control seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of (14)CO(2) release from [2-(14)C]acetate, [1-(14)C]glucose, and [6-(14)C]glucose is lower in the stressed seeds than the control seeds during the respiratory lag phase.”
t0“Citrullus lanatus”
Claim · model-written summary
Water stress did not completely inhibit glycolysis, the pentose phosphate pathway or the tricarboxylic acid cycle.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Outcome
- neither glycolysis, the pentose phosphate pathway, nor the tricarboxylic acid cycle is completely inhibitede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the stressed seeds neither glycolysis, the pentose phosphate pathway, nor the tricarboxylic acid cycle is completely inhibited.”
t0“Citrullus lanatus”
Claim · model-written summary
Raffinose stayed fairly constant in stressed seeds but declined sharply in controls after 12 hours.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Treatment
- stressed seedse0
- Outcome
- raffinose contente0
- Direction
- remains fairly constante0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“raffinose content in the stressed seeds remains fairly constant.”
t0“Citrullus lanatus”
Claim · model-written summary
Control seeds had lower reducing substance, glucose and fructose content than stressed seeds during respiratory lag.
- Taxon
- Citrullus lanatusCitrullus lanatust0
- Outcome
- reducing substance content, glucose content, and fructose contente0
- Direction
- lowere0
- Comparator
- stressed seedse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The respiratory lag phase of the control seeds coincides with a lower reducing substance content, glucose content, and fructose content than in the stressed seeds during the corresponding incubation period.”
t0“Citrullus lanatus”
The same questions in other papers
drought · growth · Citrullus lanatus (watermelon)Positive and negative results
7 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
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6 papers more in this group
See all 10 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.