Abstract
ABSTRACT: The evolution in virulence of Puccinia coronata f. sp. avenae has challenged the genetic resistance to crown rust in oat genotypes. New resistance sources are constantly required for yield stabilization and costs reduction. This study aimed to characterize the crown rust resistance of oat genotypes and the disease´s productive and economic impact. Experiments were conducted in two environments, with and without chemical control. Resistance was measured by disease progress, apparent rate of infection, final severity and pustule size. Damages were based on reduction of yield, 1000 grain mass and hectoliter mass. UFRGS16Q6030-2 was immune. In both environments, UFRGS166091-2 and URS Brava exhibited the greatest level of resistance and the smallest grain yield reduction, while URS 22 was highly susceptible, reducing more than 70% of its grain yield. These results surpass the negative impacts of the disease previously reported in oats, particularly related to grain yield. The data presented in this paper highlighted the importance of genetic resistance, particularly partial resistance, for maintaining oat genetic yield potential, reducing environmental contamination with less fungicides, and increasing economic gains with oat cultivation.
Highlights
Oat (Avena sativa L.), a member of the Poaceae family, is used for human consumption and animal feed
The objective of this study was to characterize the resistance of six oat genotypes to crown rust and to evaluate the economic impact caused by the disease in a favorable environment, such as the Southern Brazil
On University of Rio Grande do Sul (UFRGS) 166091-2, the disease period was from 67 dae to 94 dae, ending with 18.8% severity only (Figure 1B)
Summary
Oat (Avena sativa L.), a member of the Poaceae family, is used for human consumption and animal feed. It is an excellent option for crop succession systems in subtropical regions, as those adopted in Southern Brazil with soybean and maize, as well as in the maintenance of no- tilling systems. V.51, n.3, Uruguay (LEONARD & MARTINELLI, 2005) It spreads in all oat cultivated areas, and limits grain production and quality (MARTINELLI et al, 1994). Genetic resistance to P. coronata can be race-specific or non-race-specific (CARSON, 2011; LEONARD, 2002). Its main effects are longer latent period, lower infection frequency, pustule size and infectious period (ADMASSU-YIMER et al, 2018; RUWALI et al, 2013)
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