Tag Archives: genetic variability

xxx D.C. Silveira, M. Pelissoni, C.R. Buzatto, S.M. Scheffer-Basso, L.A. Ebone, J.M. Machado and N.C. Lângaro
Anatomical traits and structural components of peduncle associated with lodging in Avena sativa L.
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Anatomical traits and structural components of peduncle associated with lodging in Avena sativa L.

D.C. Silveira¹*, M. Pelissoni², C.R. Buzatto³, S.M. Scheffer-Basso², L.A. Ebone², J.M. Machado⁴ and N.C. Lângaro²

¹Federal University of Rio Grande do Sul, Faculty of Agronomy, Departament of Forage Plant and Agrometeorology, Av. Bento Gonçalves, 7712 Bairro Agronomia, CEP 91540-000 Porto Alegre RS, Brazil
²University of Passo Fundo, Faculty of Agronomy, Agronomy Post-Graduate Program, BR 285, Bairro São José, CEP 99052-900 Passo Fundo, Brazil
³University of Passo Fundo, Institute of Biological Sciences, Environmental Sciences Post-Graduate Program, BR 285, Bairro São José, CEP 99052-900 Passo Fundo, Brazil
⁴University of Cruz Alta, Faculty of Medicine veterinary, Center for Health and Agrarian Sciences, Rod. Jacob Della Méa, km 5.6, ZIP98005-972 Cruz Alta, Brazil
*Correspondence: diogenessilveira@hotmail.com

Abstract:

Lodging dramatically reduces the yield of cereals and increases the difficulty of mechanical harvesting. Because it is a complex phenomenon, new cultivars with genetic resistance to lodging is a sustainable alternative in agricultural production systems. This resistance is associated with a combination of factors, such as stem thickness and stiffness, being closely linked to anatomical traits and structural carbohydrates present in the stem. In the present study we compared, under field conditions, eight contrasting oat cultivars in terms of lodging resistance. Our aim in this study was to investigate the association of anatomical traits and structural components of the peduncle with resistance to lodging, aiming to assist in the plant selection process. In addition, a second objective was to understand the genetic dissimilarity among oat cultivars according to the characters studied. Some characteristics for potential indirect selection were studied in this work and if correlated with lodging can be used to identify superior genotypes. From the anatomical point of view, the correlation obtained between the internal vascular bundle and the lodging resistance factor allowed us to confirm that this trait can be used in indirect selection to lodging resistance. The structural components of peduncle, in the two ways explored in the present study, comparison of mean and correlation, did not demonstrate the potential to be used exclusively as plant selection characters traits for lodging resistance. There is noticeable variability in oat cultivars for most stem traits.

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99–103 Ü. Tamm
The variation of agronomic characteristics of European malting barley varieties
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The variation of agronomic characteristics of European malting barley varieties

Ü. Tamm

Jõgeva Plant Breeding Institute, 48309 Jõgeva, Estonia; e-mail: Ylle.Tamm@jpbi.ee

Abstract:

The field experiments were carried out in 1999_2002 at the Jõgeva Plant Breeding Institute (PBI) in Estonia to investigate the genetic and environmental variation of agronomic characteristics of malting barley. 57 malting barley varieties were included in the trials. Grain yield, number of tillers per 1m², plant height, lodging resistance and growing time were measured in the trial with malting barley.
 Despite very different weather conditions, the grain yield stability of malting barley varieties was very high. Tillering  showed somewhat lower genetic variability compared to the variation of grain yield. The plant height indicates moderate genetic variability. Lodging resistance and growing time showed  low genetic variability.

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