Abstract
An outdoor pot experiment was conducted in 2014/2015 growing season at Giza Agricultural Research Station to evaluate powdery mildew (PM) severity on 18 flax lines. The tested lines were divided into two distinct groups. The first group included 12 highly resistant lines (HRLs). Disease severity on these lines ranged from 1 to 10%. The second group included 6 highly susceptible lines (HSLs) where disease severity ranged from 90–100%. Levels and activities of phenols, alkaloids, proteins, proline, polyphenol oxidase and peroxidase significantly increased in the infected leaves of the HRLs, compared with the HSLs. Of these components, phenols and peroxidase showed the highest increases in the HRLs (102.34 and 199.33%, respectively). These results indicate that the tested biochemical components have roles to play in flax defense against PM through a variety of mechanisms. The results also suggest that phenols or peroxidase in infected leaves could be used in breeding programs to select resistant lines at early stage of PM development.
Zusammenfassung
In der Anbausaison 2014/2015 wurde in der Giza Agricultural Research Station ein Topfexperiment im Freien durchgeführt, um die Schwere von Mehltaubefall bei 18 Flachslinien zu beurteilen. Die getesteten Linien wurden in zwei unterschiedliche Gruppen unterteilt. Die erste Gruppe umfasste 12 hochresistente Linien (highly resistant lines, HRLs). Die Schwere des Befalls dieser Linien reichte von 1 bis 100 %. Die zweite Gruppe umfasste 6 hochanfällige Linien (highly susceptible lines, HSLs), bei denen die Schwere des Befalls von 90 bis 100 % reichte. Die Aktivität von Phenolen, Alkaloiden, Proteinen, Prolin, Polyphenoloxidase und Peroxidase erhöhte sich in den infizierten Blättern von HRLs signifikant im Vergleich zu HSLs. Von diesen Verbindungen zeigten Phenole und Peroxidase den größten Anstieg bei HRLs (102,34 bzw. 199,33 %). Diese Ergebnisse deuten darauf hin, dass die getesteten biochemischen Verbindungen eine Rolle in der Abwehr der Flachspflanzen gegen Mehltau über verschiedene Mechanismen spielen. Die Ergebnisse weisen darüber hinaus auch noch darauf hin, dass Phenole oder Peroxidase in infizierten Blättern in Zuchtprogrammen genutzt werden könnten, um resistente Linien zu einem frühen Zeitpunkt in der Mehltauentwicklung zu selektieren.
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Aly, A.A., Mansour, M.T.M. & Mohamed, H.I. Association of Increase in Some Biochemical Components with Flax Resistance to Powdery Mildew. Gesunde Pflanzen 69, 47–52 (2017). https://doi.org/10.1007/s10343-017-0387-7
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DOI: https://doi.org/10.1007/s10343-017-0387-7