Abstract
Maize samples of plants from siblings of open pollinated populations from all parts of Italy have been cytologically investigated. It has been found that the amount of heterochromatin is on the increase in all parts of Italy but more so in the central regions. New knob forming segments have been located and their origin is thought to be from de novo formation of knob substance.In the course of meiotic studies several chromosome aberrations have been observed. The rates of spontaneous mutation has also been investigated. These rates are higher in the south than north while in the center it is medium. Contrariwise the amount of heterochromatin is higher in the north and lower in the south. In view of this the frequency of spontanous mutations observed in supposed to be partly due to heterochromatin differences and chromosome interaction and partly due to chromosomal aberrations.The possible role of heterochromatin in the structure and function of maize chromosomes has been discussed.The influence of spontaneous mutations and the changing pattern of heterochromatin have been mentioned in relation to evolution of maize in Italy.
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Claims 5
Claim · model-written summary
Maize heterochromatin increased throughout Italy, especially centrally.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of heterochromatin is on the increase in all parts of Italy but more so in the central regions”
t0“Italian Maize Population”
Claim · model-written summary
New knob-forming chromosomal segments were located.
- Outcome
- New knob forming segmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“New knob forming segments have been located”
t0“Italian Maize Population”
Claim · model-written summary
Several chromosome aberrations were observed during meiosis.
- Outcome
- chromosome aberrationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the course of meiotic studies several chromosome aberrations have been observed”
t0“Italian Maize Population”
Claim · model-written summary
Spontaneous mutation rates were higher in southern than northern Italy, with intermediate central rates.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These rates are higher in the south than north while in the center it is medium.”
t0“Italian Maize Population”
Claim · model-written summary
Heterochromatin amount was higher in northern than southern Italy.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of heterochromatin is higher in the north and lower in the south”
t0“Italian Maize Population”