Abstract
Sugar beet plants with S-type of cytoplasm grown from the agamospermic seeds demonstrate a wide variability of the pollen grains sterility-fertility character (the CMS system-cytoplasmic male sterility). The phenotypic expression of this character was determined, on the first hand, by the cell plasmotype and, on the other hand, by the epigenetic variability of the expression level of Rf, -rf, and Rf2 -rf2 nuclear genes, which interact with mitochondrial genes and determine the development of CMS. The inactivated dominant alleles Rf1° and Rf2° in homozygous state were supposed to function as sterility maintaining genes. Activating of those alleles through the process of plant growing and development leads to a partial or complete recovery of pollen grains fertility in flowers of plants with S-type of cytoplasm. The apozygous mode of seed reproduction completely conserved the mother plant’s plasmotype. The relative content of S- and N-type nucleotide sequences in mitochondria of leaf tissue did not correlate with phenotypic expression level of CMS character in analyzed plants. It was shown that the heteroplasmic state of mitochondrial intracellular population could not be represented by Sor N- plasmotype as a whole but by the sequences of separate mitochondrial genes.
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Maletskii, S.I., Khvorostov, I.B., Maletskaya, E.I. et al. The variability of pollen grains sterility - fertility character in sugar beet plants with S-type of cytoplasm for agamospermic mode of seed reproduction. Sugar Tech 1, 139–145 (1999). https://doi.org/10.1007/BF02945188
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DOI: https://doi.org/10.1007/BF02945188