Articles
DISPERSION OF CRYPHONECTRIA PARASITICA VEGETATIVE COMPATIBILITY GROUPS IN A CHESTNUT STAND COMPOSED OF DIFFERENT PROGENIES
Article number
844_57
Pages
411 – 420
Language
English
Abstract
In 2003 and 2006 occurrence and dispersion of vegetative compatibility groups (VCGs) of chestnut blight fungus, Cryphonectria parasitica, was investigated in the stand of 270 chestnut seedlings, 20-year-old, belonging to different progenies.
Majority of progenies were derived from controlled intra-specific crosses C. sativa × C. sativa and open pollinated C. sativa trees.
Three progenies were derived from interspecific crosses C. sativa × C. crenata. Between 2003 and 2006, the portion of blighted stems rose from 7% to about 19%. Among 79 isolate, a total of seven VCGs were detected (EU 5, EU 12, EU 13, EU 15, EU 16, EU 17, EU 2). In 2003 was missing EU 2 and in 2006 EU 15 type.
The same two VCGs (EU 5, EU 13) dominated in both surveyed years comprising nearly 70% of all isolates.
Dispersion pattern of individual VCGs was analysed by Mantel test based on correlation of two matrices.
One matrix contained the Gower distances between trees with cankers of the same VCG and the other one contained estimates of Euclidean distance between all blighted trees with VCGs assigned at random.
Results have pointed at significantly non- random dispersion of VCGs in both surveyed years.
Aggregation of VCGs strongly correlated with the origin of blighted trees.
Progenies derived from three mother trees C. sativa of home origin exhibited significantly higher infection rate (from 42 to 50%) than remaining progenies.
Only one blighted tree was found in 2006 among 20 inter-specific hybrids.
Majority of progenies were derived from controlled intra-specific crosses C. sativa × C. sativa and open pollinated C. sativa trees.
Three progenies were derived from interspecific crosses C. sativa × C. crenata. Between 2003 and 2006, the portion of blighted stems rose from 7% to about 19%. Among 79 isolate, a total of seven VCGs were detected (EU 5, EU 12, EU 13, EU 15, EU 16, EU 17, EU 2). In 2003 was missing EU 2 and in 2006 EU 15 type.
The same two VCGs (EU 5, EU 13) dominated in both surveyed years comprising nearly 70% of all isolates.
Dispersion pattern of individual VCGs was analysed by Mantel test based on correlation of two matrices.
One matrix contained the Gower distances between trees with cankers of the same VCG and the other one contained estimates of Euclidean distance between all blighted trees with VCGs assigned at random.
Results have pointed at significantly non- random dispersion of VCGs in both surveyed years.
Aggregation of VCGs strongly correlated with the origin of blighted trees.
Progenies derived from three mother trees C. sativa of home origin exhibited significantly higher infection rate (from 42 to 50%) than remaining progenies.
Only one blighted tree was found in 2006 among 20 inter-specific hybrids.
Publication
Authors
M. Bolvanský, M. Kobza, K. Adamčíková, G. Juhásová, B. Stehlíková
Keywords
chestnut blight, Castanea sativa, C. sativa × C. crenata hybrids, Mantel test, aggregation of VCGs
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