Wild Helianthus species: A reservoir of resistance genes for sustainable pyramidal resistance to broomrape in sunflower

• DOI: 10.3389/fpls.2022.1038684
• Publication Date: 2022-10-20T05:24:21Z
• Authors: Mireille Chabaud; Marie-Christine A...; Marie-Claude Boni...; Sabine Delgrange; Tifaine Folletti; Marie-Françoise J...; Alexandra Legendre; Begoña Pérez-Vich; Jean-Bernard Pouv...; Leonardo Velasco; Philippe Delavault; Stéphane Muños
• Keywords: Orobanche; Helianthus annuus; Helianthus; Parasitic plant

Orobanche cumana Wall., sunflower broomrape, is one of the major pests for crop. Breeding resistant varieties in has been most efficient method to control this parasitic weed. However, more virulent broomrape populations continuously emerge by overcoming genetic resistance. It thus essential identify new resistances acting at various stages interaction and combine them improve resistance durability. In study, 71 wild sunflowers relatives accessions from 16 Helianthus species were screened pots their late emergence stage. From initial screen, 18 9 showing resistance, phenotyped early interaction: induction seed germination root exudates, attachment host development tubercles rhizotron assays. We showed that are an important source races, affecting inability induce germination, incompatible attachments or necrotic tubercles, arrest emerged structure growth. Cytological studies several cellular mechanisms shared among species.