Sunflower genetic resistance to Phomopsis Helianthi (Munt. Cvet. et al.) attack
1994
Vranceanu, A.V. | Craiciu, D. | Soare, G. | Pacureanu, M. | Voinescu, G. | Sandu, I. (Research Institute for Cereals and Industrial Crops, Fundulea (Romania))
Stem canker induced by Diaporte helianthi (Munt. Cvet. et al.) (Phomopsis helianthi Munt. Cvet. et al.), identified for the first time in Romania in 1981, was reported in 1984 in all sunflower cropping zones of the country. Investigations conducted at Fundulea since 1988, concerning the behaviour of sunflower hybrids, and studies on heredity of resistance carried out by dialled crosses have revealed the phenomenon of partial dominance and prevailing additivity of resistance. The heavy natural infection in 1991 at Fundulea and the experimental design suitable for the genetic control of quantitative characters permitted to appreciate the number of genes involved and to estimate the parameters of genetic variance in the frame of the analysed system.
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