Analysis of cpSSR in triticale plants obtained by in vitro androgenesis
In vitro androgenesis allows haploid and double haploid homozygous plants to be obtained. However, in cereals, non-viable albino plants are often produced. This limits the use of this technique both in basic studies and in plant genetic improvement programs. We have analyzed eight microsatellites of the chloroplast genome (cpSSR) in a collection of 46 double haploid green lines derived from the intervarietal hybrid ‘Torote’ × ‘Presto’, and 49 haploid albino plants all obtained from the double haploid line ‘ATOPE-41’, in order to know the stability of this sequences after the androgenetic process. The green plants showed no variations at the analyzed loci, while two of the albino plants differed at two loci: WCt2 and WCt9. These variations notably affected the microsatellite nucleotide sequences as well as the sequences surrounding them. The changes observed consisted of insertions, deletions and nucleotide substitutions, with transition and transversion types equally common. The latter albino plants showed several alleles at the polymorphic loci, indicating the existence of heteroplasmy.
Keywordsalbino plants Triticale cpSSR double haploids microsatellites androgenesis
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