Discovery of tribenuron-methyl resistant wild Helianthus annuus L. population
(ANN-KAN) created an opportunity for expansion of sunflower herbicide
resistance breeding program. The aim of this study was development of
sunflower hybrids resistant to tribenuron-methyl. Creation of
tribenuron-methyl resistant hybrids would enable the use of a wider palette
of herbicides for sunflower, more efficient chemical control of Cirsium
arvense and more economically profitable post-emergence control of some
annual broad-leaves weeds in sunflower. Original populations SURES-1 and
SURES-2 are homozygous for resistance to tribenuron-methyl. F1 generations
produced from the crossings are completely resistant to tribenuron-methyl,
pointing out to dominant way of inheritance of this trait. Studies on the
exact number of genes controlling the resistance are in progress.
Tribenuron-methyl resistance was transferred from original populations into a
number of female and male inbred lines of cultivated sunflower. These inbred
lines could enable creation of a number of hybrids resistant to
tribenuron-methyl. Hybrids SUMO-1-PR, SUMO-2- OR and SUMO-3 are resistant to
doubled application dose of tribenuron-methyl. Agronomical characteristics
of these hybrids are on the level with the leading conventional sunflower
hybrids.
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