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1

Heteroplasmy in plants

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Woloszynska M., Oziemlak A., Janska H.
Biotechnologia
|
2001
|
issue 1
42-46
EN
Heteroplasmy is the state characterised by the presence of more than one type of mitochondrial or chloroplast genome in one organism. Infrequent recombinations across short repeated sequences often lead to heteroplasmy in higher plant mitochondria. Different Phaseolus species have been examined in order to understand the dynamics of heteroplasmy originating through recombination mediated by the 315 bp repeated sequence. Two techniques were applied to detect heteroplasmy: Souhern hybridization with prolonged autoradiography and PCR amplification followed by hybridization or reamplification. In all examined genomes the four recombination forms were detected. However, these forms do not occur in the same relative amounts. Moreover, in the examined genomes different recombination forms exist at the predominant/substoichiomeric level, but always only two of them are predominant. Based on these results and the previous data, we suggest that the changes in the heteroplasmic population of mitochondrial molecules in plants may offer the source of genetic variation in the course of evolution.
2

Molecular basics of plant response to low temperature

100%
Kmiec B., Drynda R., Woloszynska M.
Biotechnologia
|
2005
|
issue 3
184-200
EN
Low temperature, drought and high salinity are common stress conditions that lead to similar plant cell responses. Although, in this paper, we focus on cold stress, it has to be underlined that most of the response mechanisms triggered by cold are not restricted only to this abiotic factor. We describe molecular level of plant acclimation to low temperature, including up- and down regulated genes as well as signal transduction pathway. The gene mutations that affect the ability of a plant to acclimate, as well as the methods allowing to identify genes involved in response to cold stress, are presented in this review.
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