Analiza expresiei genei NPR1 la unele genotipuri de floarea-soarelui cu rezistenţă diferită la Orobanche Cumana [Articol]

Abstract

Broomrape (Orobanche cumana Wallr.) is a root holoparasite that severely affects sunflower crops, significantly reducing yield in the majority of sunflower-growing countries. Genetic improvement through the development of resistant genotypes remains one of the most effective and sustainable control strategies. This study analyzed the relative expression of the NPR1 gene, a key regulator of systemic acquired resistance (SAR), in three sunflower hybrids with different resistance levels during the pre-attachment stage of host–parasite interaction. The expression profile of the NPR1 gene remained relatively constant during the first 12 hours post inoculation, both under control conditions and in the presence of germinated O. cumana seeds in all three hybrids studied. In contrast, at 24 hours post-inoculation, strongly reduced levels were found in the sensitive genotype.