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Background  Plant height is an important wheat trait that is regulated by multiple genes, among which  Rht  is of the utmost value. In wheat,  Rht-B1p  (= Rht17 ) is a mutant allele of the  Rht  gene that encodes for a DELLA-protein and results in the development of gibberellin-insensitive plants with a dwarfing phenotype. The pleiotropic effects of dwarfing genes on yield are highly dependent on both the genetic background and the environmental conditions. In Russia, the Central Non-Black Earth Region and Krasnodar Krai are two economically important regions that require differing management for sustainable wheat production for food, feed and industry. The purpose of our study was to compare the pleiotropic effects of  Rht-B1p  on the main valuable agronomic traits in the F 3:4  families of the spring bread wheat Chris Mutant/Novosibirskaya 67 in the genetic background of  Vrn-B1a / vrn-B1  (spring/winter phenotype) and  Ppd-D1a / Ppd-D1b  (insensitivity/sensitivity to photoperiod) alleles in a field experiment in Moscow and Krasnodar Krai.    Results  Plant height was reduced on average by 21 cm (28%) and 25 cm (30%), respectively;  Ppd-D1a  slightly strengthened the dwarfing effect in Moscow and mitigated it in Krasnodar Krai. Grain weight of the main spike was reduced by  Rht-B1p  in Moscow and to lesser extent in Krasnodar;  Ppd-D1a  and  Vrn-B1a  tended to partially compensate for this loss in Krasnodar Krai. Thousand grain weight was reduced on average by 5.3 g (16%) and 2.9 g (10%) in Moscow and Krasnodar Krai, respectively, but was partially compensated for by  Ppd-D1a  in Krasnodar Krai. Harvest index was increased due to  Rht-B1p  by 6 and 10% in Moscow and Krasnodar Krai, respectively.  Rht-B1p  resulted in a delay of heading by 1–2 days in Moscow.  Ppd-D1a  accelerated heading by 1 day and 6 days in Moscow and in Krasnodar Krai, respectively.    Conclusions   Rht-B1p  could be introduced into wheat breeding along with dwarfing genes such as  Rht-B1b  and  Rht-D1b . Special attention should be paid to its combination with  Ppd-D1a  and  Vrn-B1a  as regulators of developmental rates, compensators of adverse effects of  Rht-B1p  on productivity and enhancers of positive effect of  Rht-B1p  on harvest index.

Effects of Rht17 in combination with Vrn-B1 and Ppd-D1 alleles on agronomic traits in wheat in black earth and non-black earth regions