Quantitative Resistance to Biotrophic Filamentous Plant Pathogens: Concepts, Misconceptions, and Mechanisms: Video 1

A video from the 2015 review by Rients E. Niks, Xiaoquan Qi, and Thierry C. Marcel, "Quantitative Resistance to Biotrophic Filamentous Plant Pathogens: Concepts, Misconceptions, and Mechanisms," from the Annual Review of Phytopathology. 

Shown: Seedling leaves of three barley genotypes infected by isolate 1.2.1 of Puccinia hordei, the barley leaf rust fungus, showing the difference in rate of pustule development in a monocyclic test. Times (in days and hours) after inoculation are indicated.

Genotypes are extremely susceptible (L94), partially resistant (Vada), and extremely high partially resistant (17-5-16). The pale flecks are immature infections, and the orange pustules are mature sporulating reproduction organs of the fungus (uredinia).

Day 7, 17:00: Almost all pustules on L94 are mature, whereas only the first pustules on Vada are mature.

Day 9, 2:00: Almost all pustules on Vada are mature, and on 17-5-16 the first mature pustule has just appeared. Vada shows approximately 50% fewer mature pustules than L94.

Day 12, 9:00: The final number ofmature pustules on 17-5-16 is 12, which is much less than on Vada and L94.