Find in Library

Dwarfing genes not only reduce the height of triticale plants, but also have pleiotropic effects on important agronomic traits. An important task for breeding is to evaluate the effects of gibberellin responsive (GAR) and gibberellin-insensitive (GAI) dwarfing genes in one genotype. In the greenhouse experiment, we evaluated the effects of the GAI gene <i>Rht-B1<b>b</b></i> of wheat and the GAR gene <i>Ddw1</i> of rye on height and the main agronomic traits in two connecting populations derived from crossing <i>Ddw1</i> donors (cv. &#8216;Mudrets&#8217; and cv. &#8216;Valentin 90&#8217;) with a <i>Rht-B1<b>b</b></i> donor (cv. &#8216;Dublet&#8217;). The results show a strong decrease in height under the influence of <i>Ddw1</i> in both populations by more than 30%. In this case, <i>Rht-B1<b>b</b></i> in the presence of <i>Ddw1</i> does not lead to a significant decrease in the height of the spring triticale; thus, this is not likely to be included in breeding programs in order to further reduce the height in the presence of <i>Ddw1</i> in the spring triticale germplasm. However, <i>Ddw1</i> reduces the 1000 grain weight, while <i>Rht-B1<b>b</b></i> increases the grain number per spike and grain number per spikelet. Thus, our studies have demonstrated the negative effect of <i>Ddw1</i> on spring triticale productivity of the main spike in the greenhouse experiment, which can be partially compensated by <i>Rht-B1<b>b</b></i>.