Abstract
SUMMARYThe relation between cotyledon water content and following processes: i) DNA synthesis in cells of the radicle meristems, ii) mitotic activity in the meristems, iii) accumulation of storage material, has been studied during ripening of seeds in Vicia faba.It has been found that DNA synthesis stops when water content is still 75% of cotyledon fresh weight, while mitotic activity continues as long as water content is higher than 65%. This extended mitotic activity produces a progressive decrease in relative frequency of G2 cells, but not all G2 cells reach the G1 phase at full ripening stage.Accumulation of reserve material is less sensitive to decreased water supply; in fact it lasts as long as water content is higher than 55%.The data presented seem to indicate that each of the processes considered is limited by a critical level of water availability.
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Claims 6
Claim · model-written summary
DNA synthesis stopped at 75% cotyledon water content.
- Taxon
- Vicia faba
Vicia fabae1 - Outcome
- DNA synthesise0
- Direction
- stopse0
- Value
- 75%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DNA synthesis stops when water content is still 75% of cotyledon fresh weight”
e1“in Vicia faba”
Claim · model-written summary
Mitotic activity continued above 65% water content.
- Taxon
- Vicia fabaVicia fabae1
- Outcome
- mitotic activitye0
- Direction
- continuese0
- Value
- 65%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mitotic activity continues as long as water content is higher than 65%”
e1“in Vicia faba”
Claim · model-written summary
Extended mitotic activity progressively reduced the relative frequency of G2 cells.
- Taxon
- Vicia fabaVicia fabae1
- Outcome
- relative frequency of G2 cellse0
- Direction
- decreasee0
- Qualifier
- extended mitotic activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This extended mitotic activity produces a progressive decrease in relative frequency of G2 cells”
e1“in Vicia faba”
Claim · model-written summary
Some G2 cells had not reached G1 at full ripening.
- Taxon
- Vicia fabaVicia fabae1
- Organ / stage
- full ripening stagee0
- Outcome
- not all G2 cells reach the G1 phasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but not all G2 cells reach the G1 phase at full ripening stage”
e1“in Vicia faba”
Claim · model-written summary
Reserve accumulation persisted while water content exceeded 55%.
- Taxon
- Vicia fabaVicia fabae1
- Outcome
- Accumulation of reserve materiale0
- Direction
- lastse0
- Value
- 55%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Accumulation of reserve material is less sensitive to decreased water supply; in fact it lasts as long as water content is higher than 55%”
e1“in Vicia faba”
Claim · model-written summary
The authors infer distinct critical water levels limit the examined ripening processes.
- Taxon
- Vicia fabaVicia fabae1
- Outcome
- processes considerede0
- Qualifier
- critical level of water availabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“each of the processes considered is limited by a critical level of water availability”
e1“in Vicia faba”