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Correlations between the chloroplast and mitochondria ultrastructure characters and the morphological characters of fertile and cytoplasmically male sterile maize lines

Correlations between the chloroplast and mitochondria ultrastructure characters and the morphological characters of fertile and cytoplasmically male sterile maize lines

Genetika i Selektsiya 21(3): 200-214

Correlations have been sought in experimental data (Davidenko et al. 1987, Krouleva et al. 1987, Krouleva et al., in print), concerning the ultrastructural characters of chloroplasts and mitochondria and the plant's morphological characters in view of elucidating the mechanisms of realization of nuclear and cytoplasmic information by the cell's organelle structure. Analysis of correlation pairs of both the ultrastructure and of the morphological characters showed that the various characters change independently from one another, therefore, it cannot be assumed that the individual maize lines possess differing nuclear and cytoplasmic genes affecting the changes of these characters (Tables 1, 2, 3 and Figs 1, 2, 3). Analysis of the relations between the characters of cytoplasmic organelle ultrastructure and the plants' morphological characters showed high, statistically significant values (Tables 4 and 5). In most cases mitochondrial and chloroplast ultrastructural characters proved to be related with the same characters of plant morphology, a fact which could explain also the presence of high, statistically significant relations between the characters of chloroplast and mitochondrial ultrastructure (Table 6). Analysis of the multiple correlations between individual morphological characters and the groups of selected characters of mitochondrial and chloroplast ultrastructure (Table 7) and the correlation cluster analysis method of total investigated characters (Fig. 4) showed that the changes in plant productivity are related with changes in the quantitative characters of chloroplast and mitochondrial ultrastructure. These data substantiate the assumption that in maize male gametophyte sterilization participates also the genetic chloroplast structure or, that it is possible that male sterility is conditioned by the interaction between the genetic systems of these two organelles. The absence of strong relations between male sterility characters and the changes in some morphological and ultrastructural parameters of the organelles shows that the different sources of cytoplasm carry different plasmagenes responsible not only for the sterilization of the male gametophyte but also for the changes in quantitative characters of organelle ultrastructure and of plant morphology.

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