Dobrudzha Agricultural Institute - General Toshevo
Резюме
A male sterile two-linear sunflower hybrid was developed at Dobrudzha
Agricultural Institute – General Toshevo using the method of inter-linear
hybridization. The mother component is line 3607A which possesses cytoplasmic
male sterility, and the father component is line 240R, a fertility restorer of branched
type. Both parental forms have very good general and specific combining ability.
Hybrid GTS Tedi is medium early, with vegetation period of 115 – 120 days,
plant height 150-160 cm and head diameter 22-23 cm. The percent of kernel in
seed is within the range of 68 – 72%. Seeds have absolute weight 51 – 55 g, and
oil content in seed is 45 – 46 %. The hybrid is resistant to lodging and moderately
resistant to phoma and phomopsis. The resistance to downy mildew is as high as 95
% up to race 731, and the resistance to the parasite Orobanche is 100 % (races A-F).
In the breeding fields of DAI the hybrid went through three-year testing according
to a scheme and growing technology approved for this crop. During the first two
years of the control testing it exceeded the mean standard by seed yield with 8.0
% and 8.5 %, respectively. During the third year, hybrid GTS Tedi was above the
mean standard with 8.3 % by seed yield. The maximum yield obtained at DAI was
4580 kg/ha, and the maximum oil content was 46.1 %. In 2015 and 2016 hybrid GTS Tedi went through official testing within the
structure of the Executive Agency of Variety Testing, Field Inspection and Seed
Control of Bulgaria. By the index seed yield, the yield was with 1.5 % below the
standard. Oil content was a little below the standard in both years. Hybrid GTS Tedi
was officially registered at the national Patent Agency with a certificate of a new
plant variety No 11156 from 30.10.2018 and was included in the official Varietal
List of Bulgaria. The aim of this investigation was to make as full as possible a
characterization of the new registered sunflower hybrid GTS Tedi no the base of
biological, phytopatological and economical indices.
