Degree of phenotypic dominance and heritability of the plant height in wheat hybrids with different alleles of Rht genes

Motsnyy, I. I.; Goncharova, A. I.; Чеботар, Г. О.; Chebotar, S. V.

doi:10.3103/s0095452717010108

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…In plants bearing the Rht-B1p allele, the effect of plant height reduction is 30-33% in the vegetation experiment in bread wheat [7,19]. It is known that the inheritance of Rht-B1p, like that of the dwarfing alleles with a moderate effect, Rht-B1b and Rht-B1e, is partially recessive relative to the dominant wild-type allele Rht-B1a [7,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 F3:4 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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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Peculiarities of the phenotypic dominance degree manifestation by stem length in F1bread winter wheat

2021

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The manifestation of the phenotypic dominance degree of the main stem length in F1 under hybridization of diﬀerent varieties of bread winter wheat was studied during diﬀerent for hydrothermal conditions 2018–2020. In the hybridization of Bilotserkivska napivkarlykova variety with medium-growing varieties of groups 1 and 2, the most common type of stem length inheritance was negative overdominance – 54.5 % and positive overdominance – 27.3 %. The degree of phenotypic dominance varied from -63.0 to +7.4. When used medium-sized varieties of group I in the crossing with the maternal form, the degree of phenotypic dominance had a signifcant diﬀerentiation from -257.0 to +35.0, and the determination of stem length in most combinations was negatively overdominated – 61.4 %. The combinations Shchedra nyva/Dobirna, Shchedra nyva/Vidrada, Myronivska early/Kolchuga, Antonivka/Vidrada were characterized by a stable manifestation of a negative degree of phenotypic dominance (h p > -1). When involved in the hybridization of medium-sized varieties of group 2 in the maternal form, the most common type of stem length inheritance had negative dominance as well. It was found that the degree of phenotypic dominance of stem length in F 1 depended on the selection of parental forms for hybridization and year conditions. Thus, in 2020, under more favorable conditions for the formation of stem length in most hybrids, a negative degree of phenotypic dominance was determined, and the inheritance was negatively dominated. High rates of negative hypothetical and true heterosis were found in the following hybrids: Shchedra nyva/Dobirna, Shchedra nyva/Vidrada, Kolchuga/Chornyava, Kolchuga/ Antonivka, Yednist/Dobirna, Kolchuga/Vidrada in 2018; Chornyava/Antonivka, Shchedra nyva/Dobirna, Shchedra nyva/Vidrada, Chorniava/Shchedra nyva in 2019; Myronivska early/Antonivka, Zolotokolosa/Antonivka, Myronivska early/Kolchuga, Myronivska early/Vdala, Zolotokolosa/ Yednist, Shchedra nyva/Stolychna, Shchedra nyva/Vidrada, Antonivka/Yednist, Antonivka/Vidrada, Kolchuga/Vidrada, Kolchuga/Stolychna in 2020. Key words: bread winter wheat, crossbreeding combinations, hybrids, main stem length, degree of phenotypic dominance, hypothetical and true heterosis.

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Degree of phenotypic dominance and heritability of the plant height in wheat hybrids with different alleles of Rht genes

Cited by 2 publications

References 2 publications

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

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

Peculiarities of the phenotypic dominance degree manifestation by stem length in F1bread winter wheat

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