An approach to identification of rye chromosomes affecting the pre-harvest sprouting in triticale
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The influence of the rye genome on triticale pre-harvest sprouting (PHS) resistance was studied by using Presto substitution lines, where rye chromosomes were substituted by the D genome of wheat. The PHS resistance was evaluated on the third, sixth and ninth day of a mist chamber test as a percentage of germinated kernels. All the substitution lines, except 6D(6R), showed a higher PHS resistance than cv. Presto, which means that the rye component of triticale influences negatively the triticale PHS resistance. The 2D(2R) line was the most resistant (finally 16% of sprouted grains). In all the lines, except 5D(5R), the sprouting dynamics was nearly linear during the experiment. The lowest increase in number of sprouted kernels (up to 7%) was observed in lines 3D(3R), 2D(2R) and 6D(6R) within the first three days of the mist-chamber test, but at the end of the experiment line 6D(6R) showed the highest PHS susceptibility (56% of sprouted grains). The fastest grain germination in spikes was observed for the 5D(5R) line. Thus a simple and cheap modernization of the mist-chamber test, by additional evaluation of the lag phase and the initial germination in spikes during the first three days, is suggested for selection of genotypes with higher potential of PHS avoidance.
Publication order reference
K. Rybka, Plant Breeding and Acclimatization Institute, Radzikow, 05-870 Blonie, Poland