|  ISSN: 1018-1806   |  e-ISSN: 2197-0483

Original article | Helia 2024, Vol. 47(81) 21-31

Allelic Interaction of OR7 Gene of Broomrape Resistance in Sunflower

Yakov Demurin, Yuliya Chebanova, Olga Rubanova, Saida Guchetl, Dmitrii Savichenko & Ilya Kirov

pp. 21 - 31   |  DOI: https://doi.org/10.29329/helia.2024.1101.2   |  Manu. Number: MANU-2411-03-0006

Published online: December 31, 2024  |   Number of Views: 2  |  Number of Download: 5


Abstract

Broomrape (Orobanche cumana Wallr.) causes severe yield losses in sunflower (Helianthus annuus L.). The emergence and rapid spread of highly virulent races of the parasite have been observed. The dominant Or7 (HaOr7) gene is used in breeding to control the widely spread broomrape race G. The question of the dominance degree in conditions of severe infection of different genotypes remains open. Twelve sunflower genotypes with different allelic state of the gene Or7 were used. The plant resistance was assessed in a climatic chamber at optimal conditions for sunflower and broomrape growth. Molecular marker system was applied to confirm the allelic state of Or7 gene. Resistant homozygous Or7Or7, heterozygous Or7or7 and susceptible homozygous or7or7 genotypes shown infection rate of broomrape at 1.81, 6.58 and 19.00 tubercles per plant accordingly. Partial dominance degree of h/d = -0.44 and the dose effect of a dominant Or7 allele were obvious. For the first time a change of dominance was noted in a cross combination in which the broomrape resistance trait was completely recessive. Development of a homozygous hybrid for Or7 gene can solve the problem of low broomrape resistance of heterozygous high yield hybrids in breeding programs.

Keywords: Sunflower; Broomrape; Gene; Dominance; Molecular Marker; Hybrid


How to Cite this Article?

APA 6th edition
Demurin, Y., Chebanova, Y., Rubanova, O., Guchetl, S., Savichenko, D. & Kirov, I. (2024). Allelic Interaction of OR7 Gene of Broomrape Resistance in Sunflower . Helia, 47(81), 21-31. doi: 10.29329/helia.2024.1101.2

Harvard
Demurin, Y., Chebanova, Y., Rubanova, O., Guchetl, S., Savichenko, D. and Kirov, I. (2024). Allelic Interaction of OR7 Gene of Broomrape Resistance in Sunflower . Helia, 47(81), pp. 21-31.

Chicago 16th edition
Demurin, Yakov, Yuliya Chebanova, Olga Rubanova, Saida Guchetl, Dmitrii Savichenko and Ilya Kirov (2024). "Allelic Interaction of OR7 Gene of Broomrape Resistance in Sunflower ". Helia 47 (81):21-31. doi:10.29329/helia.2024.1101.2.

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