Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Florin Gabriel ANTON, Laura CONTESCU, Luxița RÎȘNOVEANU, Maria JOIȚA-PĂCUREANU, Daniela OPREA, Mihaela ȘERBAN
In Romania, sunflower represent the main oil crop and occupies the third place after wheat and maize. Orobanche cumana Wallr (sunflower broomrape) is a parasitic plant who infested sunflower plants and causes low seed yield. In this paper we present behaviour of sunflower genotypes in field natural infested with broomrape, in Braila location, in year 2022. We tested for resistance/tolerance at parasite Orobanche cumana, 21 experimental sunflower hybrids, belonging to NARDI Fundulea and 10 differential genotypes and one additional for determination of broomrape races. Degree attack (GA) of broomrape was between 0.05 at sunflower hybrid H1 and 6.2 at H10 and infested sunflower plants (I %) was between 5% at H1 and 100% at H3 and from H6 to H21. All sunflower differential genotypes was infested with broomrape from 25% at KA41 (gene Or1) to 100% at AD66 (no Or gene), Record (gene Or3), S1358, LC 1002 (gene Or4), P1380, LC 1003 (gene Or5), P96 (gene Or6, Or7). Only one sunflower genotype (additional differential genotype), Neagra de Cluj (accession PI 650368), was resistant at broomrape race HRO or IRO.
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