Abstract
Poor germination of carrot seeds is an important problem for both seedmen and carrot growers. The author tried to elucidate what factors are the causes of the poor germination in the carrot seed production. Control of number of umbels per plant by pruning resulted in the increase in seed weight and seed size, bnt did not improve germinability of seeds. When the umbels were harvested separately, the germinability of seeds in the first order umbels was highest, that in the second order umbels next, and that in the third order the lowest. But in the seeds grown under glass, difference was scarecely found among the seeds in the umbels of different orders. In order to clarify the effect of rainfall during seed maturing, carrot plants grown in one foot diameter clay pots were transferred into the glasshouse at different stages of seed development, from flowering to firm brown seed stage. Rainfall at the flowering stage often made the flowers sterile and that at the ripening stage lowered the seed germinability. Early flowering plants produced seeds of higher germinability than late flowering ones did. Judging from these results, the seed germinability in the third order umbels, which flower latest, is decreased by rainfall and high temperature at their ripening stage. For the purpose of improving the germinability of carrot seeds, therefore, it is advisable to prune off the umbels so as to leave only the umbels of the second order in such cases as in the variety “Kuroda” in Kyushu.
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Claims 9
Claim · model-written summary
Pruning umbels increased carrot seed weight and size.
- Taxon
- carrot
Daucus carotat0 - Treatment
- pruninge0
- Outcome
- seed weight and seed sizee0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Control of number of umbels per plant by pruning resulted in the increase in seed weight and seed size”
Claim · model-written summary
Pruning umbels did not improve carrot seed germinability.
- Taxon
- carrotDaucus carotat0
- Outcome
- germinability of seedse0
- Direction
- did not improvee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“bnt did not improve germinability of seeds”
Claim · model-written summary
Seed germinability ranked highest in first-order umbels, then second-order, then third-order.
- Taxon
- carrotDaucus carotat0
- Organ / stage
- first order umbelse0
- Outcome
- germinability of seedse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“the germinability of seeds in the first order umbels was highest, that in the second order umbels next, and that in the third order the lowest”
Claim · model-written summary
Under glass, seed germinability scarcely differed across umbel orders.
- Taxon
- carrotDaucus carotat0
- Outcome
- difference was scarecely founde0
- Setting
- under glasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“in the seeds grown under glass, difference was scarecely found among the seeds in the umbels of different orders”
Claim · model-written summary
Rainfall during flowering often rendered carrot flowers sterile.
- Taxon
- carrotDaucus carotat0
- Treatment
- Rainfall at the flowering stagee0
- Outcome
- flowers sterilee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Rainfall at the flowering stage often made the flowers sterile”
Claim · model-written summary
Rainfall during ripening lowered carrot seed germinability.
- Taxon
- carrotDaucus carotat0
- Organ / stage
- ripening stagee0
- Outcome
- seed germinabilitye0
- Direction
- lowerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“that at the ripening stage lowered the seed germinability”
Claim · model-written summary
Early-flowering plants produced more germinable seeds than late-flowering plants.
- Taxon
- carrotDaucus carotat0
- Outcome
- germinabilitye0
- Direction
- highere0
- Comparator
- late flowering onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“Early flowering plants produced seeds of higher germinability than late flowering ones did.”
Claim · model-written summary
The authors attribute reduced germinability of third-order umbel seeds to rain and heat during ripening.
- Taxon
- carrotDaucus carotat0
- Outcome
- seed germinabilitye0
- Direction
- decreasede0
- Qualifier
- rainfall and high temperature at their ripening stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“the seed germinability in the third order umbels, which flower latest, is decreased by rainfall and high temperature at their ripening stage”
Claim · model-written summary
The authors advise pruning to retain only second-order umbels to improve seed germinability in Kuroda in Kyushu.
- Taxon
- carrotDaucus carotat0
- Material
- Kurodae0
- Outcome
- prune off the umbels so as to leave only the umbels of the second ordere0
- Setting
- Kyushue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“carrot”
e0“it is advisable to prune off the umbels so as to leave only the umbels of the second order in such cases as in the variety “Kuroda” in Kyushu”
The same questions in other papers
pruning · yield · Daucus carota (carrot)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
2 papers more in this group
See all 6 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.