Genetic progress in oat associated with fungicide use in Rio Grande do Sul, Brazil

Abstract

ABSTRACT. The State of Rio Grande do Sul (RS) is the largest producer of oat in Brazil with the aid of consolidated breeding programs, which are constantly releasing new cultivars. The main objectives of this study were to: 1) evaluate the annual genetic progress in grain yield and hectoliter weight of the oat cultivars in RS, with and without fungicide use on aerial parts of plants; and 2) evaluate the efficiency of oat breeding programs in introducing disease-resistant genes in the released cultivars through network yield trials conducted with and without fungicide use on aerial plant parts. The data on grain yield and hectoliter weight were obtained from 89 competition field trials of oat cultivars carried out from 2007 to 2014 in nine municipalities of RS. Of the total 89 trials, 44 were carried out with fungicide application on aerial plant parts and 45 were carried out without fungicide application. The annual genetic progress in oat cultivars was studied using the methodology proposed by Vencovsky (1988). The annual genetic progress in oat grain yield was 1.02% with fungicide use and 4.02% without fungicide use during the eight-year study period in RS. The annual genetic progress with respect to the hectoliter weight was 0.08% for trials with fungicide use and 0.71% for trials without fungicide use. Performing network yield trials with and without fungicide use on the aerial plants parts is a feasible method to evaluate the efficiency of oat breeding programs in introducing disease-resistant genes in the released cultivars.

Discriminating Important Agronomic and Industrial Parameters of White Oat Cultivars Treated with Fungicide Based on SIMCA Algorithm

“…As reported by Wychowaniec et al [37], HW is a measure of the bulk density of the grain and is indicator of grain quality and millability. To ensure effective milling, HW should be above 50 kg/100 L for oats, as consequence, grains with high HW commands a higher price per ton, but the measured value is a combination of grain characteristics, including friction, grain shape and polydispersity [36]. Similar values in HW were also reported in other literatures [30,31,[34][35][36][37][38].…”

Assessment of Yield Attributes and Industrial Quality Parameters of Oat Cultivars (Avena sativa L.) Using Multivariate Techniques (PCA, PLS-DA and OLS-R)

“…This parameter can be affected by agronomic management practices such as seeding rates, chemical seed treatments and foliar fungicide. In a research of Mourtzins and co-workers [26], seeding rate and seed treatments did not show effect on oat yield, plant height and lodging index, but foliar fungicide application was considered mainly if disease is expected and improved the grain yield [26,27]. Higher values of the weight of 1000 grains were correlated with dough periods, good processing quality and are dependent of cultivar [25].…”

A utilização de fungicida no cultivo de aveia: uma revisão integrativa da literatura

“…A investigação de Follmann et al, (2016) foi desenvolvido durante os anos de 2007 a 2014 com 36 cultivares recomendadas para o cultivo no estado do Rio Grande do Sul, em nove municípios distintos, com e sem aplicação de fungicida. Durante os oito anos de estudo eles encontraram uma distribuição balanceada nos resultados entre as cultivares.…”

“…A redução do uso de agrotóxicos, principalmente de fungicidas na cultura da aveia, é fundamental para a diminuição dos níveis de contaminação alimentar e ambiental. Neste cenário, tem sido importante o uso de cultivares mais resistentes geneticamente às doenças foliarem por auxiliarem na redução do uso de fungicidas, com garantia do rendimento estimado de grãos (Silva et al, 2015;Follmann et al, 2016;). A partir das considerações, são desejadas cultivares de aveia branca com resistência genética a doenças foliares e que detenham maior estabilidade a redução do uso de fungicida, com o aumento o intervalo entre a colheita e a última aplicação (Cruz, Federizzi & Milach, 2001).…”