Inheritance of several sources of resistance to Phomopsis stem canker (Diaporthe helianthi Munt.-Cvet.) in sunflower (Helianthus annuus L.) |
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Authors: | A Viguié D Touvieille de Labrouhe F Vear |
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Institution: | (1) GREATm Station d'Amélioration des Plantes et de Pathologie végétale, INRA, 234 Avenue du Brézet, Clermont-Ferrand Cedex 02, France |
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Abstract: | The hybrids from 2 factorial crosses involving a total of 7 female lines and 11 restorers, representing the known range of
reaction of sunflower to Phomopsis stem canker and most of the resistance sources used in breeding programmes, were studied
in multilocational semi-natural attack trials and by artificial infections on leaves and stems in 1996, 1997 and 1998. The
results confirm that resistance is quantitative, with predominantly additive effects, although there were some female × male
interactions when individual trials were analysed. For lines used in both crosses, relative general combining abilities were
stable. Some lines not bred for Phomopsis resistance showed good or intermediate levels of resistance. Lines from or including
Yugoslavian, Rumanian and Russian sources of resistance and interspecific hybrids all provided good levels of resistance.
The majority of parental lines showed the same relative reactions to semi-natural attack and artificial infections on leaves
or stems indicating that their resistance is characterised by a slow rate of mycelial extension. However, one genotype showed
resistance to passage of Phomopsis stem canker from the petiole to the stem and two genotypes appeared susceptible to tests
but resistant to semi-natural attack, indicating that their resistance is controlled by factors not measured by the mycelium
tests. The use of combinations of these resistance sources to give high levels of stable resistance to Phomopsis stem canker
is discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | additive gene effects artificial infections general combiningability quantitative resistance rate of mycelium growth semi-natural attacks |
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