| Autor: |
Pažitný, J., Bolvanský, M., Adamčíková, K., Lehtijärvi, A. |
| Předmět: |
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| Zdroj: |
Forest Pathology; Oct2018, Vol. 48 Issue 5, pN.PAG-N.PAG, 1p |
| Abstrakt: |
Summary: The possibility of screening young seedlings of Castanea for chestnut blight resistance was examined to try to shorten time needed for a breeding programme. Two‐year‐old chestnut seedlings of eight progenies, derived from open and controlled pollination of three hybrids (Castanea sativa × C. crenata and a C. crenata tree by paternal tree of C. sativa) were screened for resistance to chestnut blight. One hybrid and a C. crenata were partially susceptible, and two hybrids were partially resistant to chestnut blight. A total of 179 seedlings were inoculated with two virulent and one hypovirulent strain of Cryphonectria parasitica at two dates (early June and early September). Stromata production was higher and canker size larger when seedlings were inoculated in early June. Differences in canker size among seedlings derived from different parental trees were observed only after September inoculation. However, differences in canker size among seedlings inoculated with the virulent strains were observed only after June inoculation. The only significant effect on seedling survival was based on fungal strains used for inoculation. Ratio of seedlings, which died after inoculation with the hypovirulent strain, was significantly lower (36.8%) than those that died after inoculation with virulent strains (88.4 and 95.1%). Survival of seedlings was affected only by fungal strains used in inoculation, and not influenced by parental trees. The risk of seedling dieback increased with increasing canker size and with decreasing stem diameter of seedlings. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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