MICOPOPULATION OF WHEAT SEED AND ITS INFLUENCE ON GERMINATION ENERGY AND GERMINATION ITSELF

• Published in: Poljoprivreda (Osijek, Croatia) Vol. 6; no. 2
• Main Author: Ruža Popović
• Format: Journal Article
• Language: English
• Published: Faculty of Agrobitechnical Sciences Osijek 01-12-2000
• Subjects: cultivars; fungi species; fungicides; germination; germination energy; infection; methods; research periods; wheat seed
• ISSN: 1330-7142; 1848-8080

Wheat seed is a very good medium for development of numerous saprophytes and parasitic fungi species that influence biological characteristics of seed and its value. The presence of fungi, especially parasitic species, causes some changes (colour changes, empty seed, spots, mould, deformation) in seed macroscopically visible. The most common agents are facultative parasites (Fusarium graminearum, Helminthosporium sativum, Septoria nodorum). They are believed to be extremely harmful since their influence on the essential seed functions are negative. The research was done on two wheat cultivars (Ţitarka and Demetra). Significant differences in micopopulation were registered at two points - immediately after harvesting and after seed storage - despite the used methods (filter paper, moist chamber, deep-freezing, germination in sand) and applied fungicides (Raxil 2WS and Vitavax 200 FF). The most numerous micopopulation was established in non-treated seed after harvesting by freezing method. There were 9 fungi genera determined of which weretwo facultative parasites. All research done on treated seed showed that there was a smaller number of fungi species and the percentage of the infected seed was lower. Under the influence of Fusarium graminearum as well as other fungi species the ability of germination was decreased. According to all used methodes both wheat cultivars seed treated with fungicides were chacarterized by a lower level of infection and better germination during both research periods. By the analyses done on the stored seed a higher percentage of nongerminate seed and deformed germs were established, especially on the treated wheat seed.