Histological Characterization of Resistance to Uromyces viciae-fabae in Faba Bean

• DOI: 10.1094/phyto.2002.92.3.294
• Publication Date: 2007-05-11T11:14:42Z
• Authors: J. C. Sillero; D. Rubiales
• Keywords: Haustorium; Appressorium; Rust (programming language)

Components of resistance to the faba bean rust (Uromyces viciae-fabae) were studied at histological level in seedlings and adult plants nine (Vicia faba) lines differing their resistance. Resistance these was previously shown be characterized macroscopically by an increased latent period, a decreased colony size, relatively infection frequency. In some lines, also associated with visible necrosis. Histological investigations revealed few differences spore germination appressorium formation. Significant levels aborted stomatal penetration fungus found on all resistant lines. However, among more evident once stomata penetrated structures. mainly due restriction haustorium formation varying early abortion colonies, reduction number haustoria per colony, smaller size. addition, necrosis host cells hyphae detectable from beginning development. This microscopically became stronger 4 days after inoculation, resulting reduced growth colony. Differences marked than seedlings.