Abstract
Despite the importance of soybeans little cytogenetic work has traditionally been done, due to the small size and apparent similarity of the chromosomes. Fifteen soybean [Glycine max (L.) Merrill] varieties adapted for cultivation in two distinct regions of Brazil were analyzed cytogenetically. A low frequency of meiotic abnormalities was noted in all varieties, although they were not equally affected. Irregular chromosome segregation, chromosome stickiness, cytoplasmic connections between cells, cytomixis and irregular spindles were the main abnormalities observed, none of which had been described previously in soybeans. All of these abnormalities can affect pollen fertility. Pollen fertility was high in most varieties and was correlated with meiotic abnormalities. Although soybean is not a model system for cytological studies, we found that it is possible to conduct cytogenetic studies on this species, though some modifications in the standard methods for meiotic studies were necessary to obtain satisfactory results.
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Claims 5
Claim · model-written summary
All varieties showed low frequency of meiotic abnormalities with unequal prevalence.
- Taxon
- soybean
Glycine maxt0 - Outcome
- meiotic abnormalitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A low frequency of meiotic abnormalities was noted in all varieties, although they were not equally affected.”
t0“soybean”
Claim · model-written summary
Five kinds of meiotic abnormalities were observed for the first time in soybeans.
- Taxon
- soybeansGlycine maxe0
- Outcome
- Irregular chromosome segregation, chromosome stickiness, cytoplasmic connections between cellse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irregular chromosome segregation, chromosome stickiness, cytoplasmic connections between cells, cytomixis and irregular spindles were the main abnormalities observed, none of which had been described previously in soybeans.”
Claim · model-written summary
Pollen fertility was high in most varieties.
- Taxon
- soybeanGlycine maxt0
- Outcome
- Pollen fertilitye0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pollen fertility was high in most varieties”
t0“soybean”
Claim · model-written summary
Pollen fertility correlated with meiotic abnormalities.
- Taxon
- soybeanGlycine maxt0
- Outcome
- Pollen fertilitye0
- Comparator
- meiotic abnormalitiese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pollen fertility was high in most varieties and was correlated with meiotic abnormalities.”
t0“soybean”
Claim · model-written summary
Modified meiotic methods gave satisfactory results.
- Taxon
- soybeanGlycine maxt0
- Outcome
- satisfactory resultse0
- Comparator
- standard methodse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some modifications in the standard methods for meiotic studies were necessary to obtain satisfactory results.”
t0“soybean”