Rht-B1p as an agronomically equivalent alternative to Rht-B1b in a spring bread wheat population
Abstract
The dwarfing allele Rht-B1p has been characterised only against the wild-type Rht-B1a. Breeders need the contrast with Rht-B1b, the allele of most semi-dwarf wheats. We tested the two for agronomic equivalence within one biparental spring wheat population segregating for Rht-B1p, Rht-B1b and Ppd-D1 (3,147 plants, 119 lines, two seasons), with margins of ±5 cm for height, ±2 days for phenology, and 5% and 10% of the trait mean, using linear mixed models on plot means. No difference was demonstrated for any of the 14 traits. After Holm adjustment, the two haplotypes were equivalent at the 5% margin for plant height and internode number, and at the 10% margin for six traits, and spike density, which was treated as exploratory. The three phenological traits were inconclusive. Rht-B1p reduces height by 21–25 cm relative to the wild type. Between the haplotypes, the difference was +0.18 cm (90% CI −1.55 to +1.91). The design was sensitive: within the Rht-B1p class, Ppd-D1b delayed heading by 4.74 and flowering by 4.15 days. No Rht-B1 × Ppd-D1 interaction was found. In the F3 families of 2018, the Rht-B1p class was 6.0 cm shorter; an allelic difference may appear in some backgrounds. In this population, at one location over two seasons, the Rht-B1p haplotype was agronomically equivalent to the Rht-B1b haplotype in plant height. Plot yield, tillering, lodging and establishment remain to be tested.
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BibTeX
@article{kroupin2026rhtb1p,
title = {{Rht-B1p as an agronomically equivalent alternative to Rht-B1b in a spring bread wheat population}},
author = {Pavel Kroupin and Lubov Nazarova and Viktoria Voronezhskaya and Anastasiya Chernook and Aleksandra Kroupina and Marina Klimushina and Gennady Karlov and Mikhail Divashuk},
journal = {Frontiers in Plant Science},
year = {2026},
month = nov,
doi = {10.3389/fpls.2026.1983351},
url = {https://www.frontiersin.org/articles/10.3389/fpls.2026.1983351},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Rht-B1p as an agronomically equivalent alternative to Rht-B1b in a spring bread wheat population
AU - Pavel Kroupin
AU - Lubov Nazarova
AU - Viktoria Voronezhskaya
AU - Anastasiya Chernook
AU - Aleksandra Kroupina
AU - Marina Klimushina
AU - Gennady Karlov
AU - Mikhail Divashuk
PY - 2026
DA - 2026/11/09
JO - Frontiers in Plant Science
DO - 10.3389/fpls.2026.1983351
UR - https://www.frontiersin.org/articles/10.3389/fpls.2026.1983351
AB - The dwarfing allele Rht-B1p has been characterised only against the wild-type Rht-B1a. Breeders need the contrast with Rht-B1b, the allele of most semi-dwarf wheats. We tested the two for agronomic equivalence within one biparental spring wheat population segregating for Rht-B1p, Rht-B1b and Ppd-D1 (3,147 plants, 119 lines, two seasons), with margins of ±5 cm for height, ±2 days for phenology, and 5% and 10% of the trait mean, using linear mixed models on plot means. No difference was demonstrated for any of the 14 traits. After Holm adjustment, the two haplotypes were equivalent at the 5% margin for plant height and internode number, and at the 10% margin for six traits, and spike density, which was treated as exploratory. The three phenological traits were inconclusive. Rht-B1p reduces height by 21–25 cm relative to the wild type. Between the haplotypes, the difference was +0.18 cm (90% CI −1.55 to +1.91). The design was sensitive: within the Rht-B1p class, Ppd-D1b delayed heading by 4.74 and flowering by 4.15 days. No Rht-B1 × Ppd-D1 interaction was found. In the F3 families of 2018, the Rht-B1p class was 6.0 cm shorter; an allelic difference may appear in some backgrounds. In this population, at one location over two seasons, the Rht-B1p haplotype was agronomically equivalent to the Rht-B1b haplotype in plant height. Plot yield, tillering, lodging and establishment remain to be tested.
SN - 1664-462X
ER -