חיפוש מתקדם
Heredity
Lucov, Z., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Cohen, S., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Moav, R., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Nicotiana tabacum plants heterozygous for the recessive gene ws (white seedling which in homozygous condition prevents chlorophyll production) show occasional albino (chlorophylless) spots on their leaves. Each spot probably originates from a somatic loss of the chromosome carrying the dominant allele Ws. Exposure of heterozygous plants to lower temperatures did not alter the number of albino spots. When, however, the dominant Ws allele was carried by an alien chromosome, introduced from N. paniculata, and the two N. tabacum genomes possessed the recessive ws, the number of albino spots increased manifold. This points to a mechanism that preserves the stability of the host's chromosomes when they are exposed to adverse conditions, but fails to do so efficiently to the alien chromosome. By exposing the alien addition plants to cold during different times of the day, it was found that complex interactions between temperature, light and the time of the day at which the exposure takes place account for a large variation in the number of spots. It was also concluded that the exposure is only effective at certain sensitive" stages of cell division and that it has no after-effects. © 1970 The Genetical Society of Great Britain.
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הספר "אוצר וולקני"
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תנאי שימוש
Effects of low temperature on the somatic instability of an alien chromosome in nicotiana tabacum
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Lucov, Z., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Cohen, S., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Moav, R., Department of Genetics, The Hebrew University of Jerusalem, Jerusalem, Israel
Effects of low temperature on the somatic instability of an alien chromosome in nicotiana tabacum
Nicotiana tabacum plants heterozygous for the recessive gene ws (white seedling which in homozygous condition prevents chlorophyll production) show occasional albino (chlorophylless) spots on their leaves. Each spot probably originates from a somatic loss of the chromosome carrying the dominant allele Ws. Exposure of heterozygous plants to lower temperatures did not alter the number of albino spots. When, however, the dominant Ws allele was carried by an alien chromosome, introduced from N. paniculata, and the two N. tabacum genomes possessed the recessive ws, the number of albino spots increased manifold. This points to a mechanism that preserves the stability of the host's chromosomes when they are exposed to adverse conditions, but fails to do so efficiently to the alien chromosome. By exposing the alien addition plants to cold during different times of the day, it was found that complex interactions between temperature, light and the time of the day at which the exposure takes place account for a large variation in the number of spots. It was also concluded that the exposure is only effective at certain sensitive" stages of cell division and that it has no after-effects. © 1970 The Genetical Society of Great Britain.
Scientific Publication
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