Abstract
The influence of ultraviolet-B (UV-B) radiation on the development of the male gametophyte was studied inZea maysL. cv. LG12 grown in a growth chamber under PAR light supplemented with UV-B radiation and compared with a second set of plants grown under PAR light. Pollen samples collected from both groups of plants were cultured on germination medium and it was found that UV-B had no effect on pollen germination. Total pollen protein content was not affected but UV-B absorbing pigments increased. Some ultrastructural alterations were observed in pollen and pollen tubes, in particular large amounts of electron dense deposits were seen throughout the cytoplasm and in association with the pollen wall. In mature spikes of UV-B treated plants, anthers retained numerous pollen grains in their loculi while anthers of control plants were almost empty. UV-B treatment delayed flowering by 2–3 d. These results show that UV-B treatment of maize plants interferes with flowering, pollen ultrastructure and anther maturation even though pollen germination is unaffected. The significant increase of UV-B absorbing pigments in pollen grains could represent a defence mechanism that enables plants to complete their reproductive cycle.
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Claims 7
Claim · model-written summary
UV-B radiation had no effect on maize pollen germination.
- Material
- LG12e0
- Organ / stage
- pollene2
- Treatment
- UV-Be2
- Outcome
- pollen germinatione2
- Direction
- no effecte2
- Comparator
- plants grown under PAR lighte1
- Setting
- growth chambere0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e1“compared with a second set of plants grown under PAR light”
e2“it was found that UV-B had no effect on pollen germination”
Claim · model-written summary
UV-B radiation did not affect total pollen protein content.
- Organ / stage
- pollene3
- Treatment
- UV-Be3
- Outcome
- Total pollen protein contente3
- Direction
- not affectede3
- Comparator
- plants grown under PAR lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e1“compared with a second set of plants grown under PAR light”
e3“Total pollen protein content was not affected but UV-B absorbing pigments increased”
Claim · model-written summary
UV-B radiation increased UV-B absorbing pigments in maize pollen.
- Treatment
- UV-Be3
- Outcome
- UV-B absorbing pigmentse3
- Direction
- increasede3
- Comparator
- plants grown under PAR lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e1“compared with a second set of plants grown under PAR light”
e3“Total pollen protein content was not affected but UV-B absorbing pigments increased”
Claim · model-written summary
Some ultrastructural alterations were observed in maize pollen and pollen tubes.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e4“Some ultrastructural alterations were observed in pollen and pollen tubes”
Claim · model-written summary
Large amounts of electron-dense deposits were seen in maize pollen cytoplasm and near the pollen wall.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e5“large amounts of electron dense deposits were seen throughout the cytoplasm and in association with the pollen wall”
Claim · model-written summary
UV-B treated maize plants retained numerous pollen grains in anthers, whereas control anthers were almost empty.
- Organ / stage
- antherse6
- Treatment
- UV-B treated plantse6
- Outcome
- anthers retained numerous pollen grains in their loculie6
- Comparator
- control plantse6
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e6“In mature spikes of UV-B treated plants, anthers retained numerous pollen grains in their loculi while anthers of control plants were almost empty”
Claim · model-written summary
UV-B treatment delayed maize flowering by 2–3 days.
- Treatment
- UV-B treatmente7
- Outcome
- floweringe7
- Direction
- delayede7
- Value
- 2–3 de7
- Comparator
- plants grown under PAR lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“studied inZea maysL. cv. LG12 grown in a growth chamber”
e1“compared with a second set of plants grown under PAR light”
e7“UV-B treatment delayed flowering by 2–3 d”
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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.