Importance of aecial cups/pustule for selection for slow rusting in pea (Pisum sativum) against Uromyces fabae.

摘要

Field and polyhouse studies indicated wide variation in number of aecial cups/pustule in pea (Pisum sativum L.) against Uromyces fabae Pers de Bary. Size of pustules varied from 0.6 mm to 2.9 mm. Correlation coefficient (r) between pustule size and AUDPC was -0.19. The coefficient of determination indicated that 3.5% of variation in AUDPC was due to pustule size. Correlations between pustule size and number of pustules/leaf were negative in resistant categories and positive in the susceptible categories, indicating compensatory effects between these traits. Size of aecial cups did not vary significantly, but the number of aecial cups/pustule varied across the genotypes. A single gene seems to govern number of aecial cups/pustule and high number of aecial cups/pustule seems to be dominant over low number. Number of aecial cups/pustule may be useful as a criterion for selection slow rusting in pea.