Abstract
Exposure of dry Zea mays seeds to x rays produced modifications in the roots of growing seedlings examined at three days of growth. X irradiation of seed inhibited cell division in the root tips of growing seedlings but apparently had no effect on cell exparnsion. Therefore, seedling growth from x irradiated seed is due primarily to expansion of cells pre-existing in the embryo. Roots grown from xirradiated seed were thicker and had more cells per cross section than roots from unirradiated seed. On the average, x irradiation had little effect on the cell cross section. Roots grown from x-irradiated seed had fewer cells in the root apex, whereas the cell length was doubled. (auth)
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Claims 7
Claim · model-written summary
Seed X irradiation inhibited root-tip cell division.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“X irradiation of seed inhibited cell division in the root tips of growing seedlings”
t0“Zea mays”
Claim · model-written summary
Seed X irradiation apparently did not affect cell expansion.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“X irradiation of seed inhibited cell division in the root tips of growing seedlings but apparently had no effect on cell exparnsion.”
t0“Zea mays”
Claim · model-written summary
Growth from irradiated seeds was attributed chiefly to expansion of cells already in the embryo.
- Treatment
- x irradiated seede0
- Outcome
- seedling growthe0
- Qualifier
- expansion of cells pre-existing in the embryoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling growth from x irradiated seed is due primarily to expansion of cells pre-existing in the embryo”
t0“Zea mays”
Claim · model-written summary
Roots from irradiated seeds were thicker and had more cells per cross section.
- Treatment
- xirradiated seede0
- Outcome
- thicker and had more cells per cross sectione0
- Direction
- moree0
- Comparator
- unirradiated seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots grown from xirradiated seed were thicker and had more cells per cross section than roots from unirradiated seed.”
t0“Zea mays”
Claim · model-written summary
Irradiation had little average effect on cell cross section.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“x irradiation had little effect on the cell cross section”
t0“Zea mays”
Claim · model-written summary
Roots from irradiated seed had fewer apex cells.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Roots grown from x-irradiated seed had fewer cells in the root apex”
t0“Zea mays”
Claim · model-written summary
Root cell length doubled after seed irradiation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“whereas the cell length was doubled”
e1“Roots grown from x-irradiated seed had fewer cells in the root apex”
t0“Zea mays”
The same questions in other papers
radiation · cytology · Zea mays (maize)Positive and negative results
3 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
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.