Pre and posthaustorial resistance to rusts in Lathyrus cicera L.

Abstract

Lathyrus cicera has a high potential as fodder crop in dry areas, but can in particular environments be damaged by rust. Little is known on the availability of resistance against rust fungi and the underlying mechanisms in L. cicera germplasm. The present study assessed and characterised macro and microscopically the resistance to rust fungi Uromyces pisi and U. viciae-fabae, in a collection of L. cicera accessions. A wide range of disease reaction was found in the germplasm collection against the different rust species. L. cicera accessions were highly resistant to U. viciae-fabae being hypersensitive response the most frequent reaction. On the contrary, most accessions showed a compatible interaction with U. pisi, with varying levels of partial resistance, although cases of hypersensitivity were also identified. Differences on germination, orientated germ tube growth and appressoria differentiation were observed but were in general of marginal importance to explain the resistance to U. pisi among the L. cicera accessions. Resistance was due, to a combination of pre and post-haustorial mechanisms.

First genetic linkage map of Lathyrus cicera based on RNA sequencing-derived markers: Key tool for genetic mapping of disease resistance

“…In both, L. cicera and L. sativus , resistant genotypes restrict the formation of haustoria resulting in a high percentage of early aborted fungal colonies, a decreased number of haustoria per colony and reduced intercellular growth of infection hyphae compared to susceptible genotypes from the same species 6,11,13 . Still, L. sativus is generally more resistant than L. cicera .…”

The Pathogenicity of Sclerotium rolfsii on Cyperus difformis and its Potential Host Specificity among the Genus Cyperus

“…Directional growth of the germ tube and formation of appressorium are controlled by the stimuli originating from the host [30]. It seems that, for the first time, an alternative 'avoidance' or prepenetration mechanism is apparent in Cyperus -S. rolfsii interaction, which operates after the contact of parasite on the host epidermal cell [31,32]. However, we failed to observe the extension of hyphae inter-and intracellularly.…”

Resistance to rusts (Uromyces pisi and U. viciae-fabae) in pea

“…Incomplete resistance identified in pea against U. pisi is not therefore based on HR, fitting the definition of Partial Resistance (PR) (Parlevliet & Van Ommeren 1975). Similarly, PR against rusts has also been reported in other legumes such as faba bean (Sillero et al 2000;Herath et al 2001), common bean (Statler & McVey 1987), grass pea (Vaz Patto et al 2009a), chickling pea (Vaz Patto et al 2009b) and chickpea (Madrid et al 2008;Sillero et al 2012).…”

“…Neither was host cell death observed later (6 DAI) (Barilli et al 2009b) discarding also the possibility of late-acting HR that was reported in other interactions such as L. cicera-U. viciae-fabae (Vaz Patto et al 2009b), V. faba-U. viciae-fabae (Herath et al 2001;Sillero & Rubiales 2002) and barleyPuccinia hordei (Niks 1986).…”