Dobrudzha Agricultural Institute - General Toshevo, 9521, General Toshevo, Bulgaria
Резюме
Sunflower hybrid Mihaela was developed at Dobrudzha Agricultural Institute
– General Toshevo (DAI). It is a male sterile two-linear hybrid derived through
inter-linear hybridization. The mother component is line 2607, which possesses
cytoplasmic male sterility, and the father component is line 10671R, a branched
fertility restorer. Both parental forms have excellent general and specific combining
ability. Hybrid Mihaela is early maturing, its vegetative growth duration is 110 –
115 days. Plant height is within the range 145 – 170 cm, and the head diameter
– within 18 – 20 cm. Thousand kernel weight varies within 53 – 65 g, and the oil
content is 46-47 %. The oil is of linoleic type. Protein content in the whole seed is
18 – 20 %. The number of seeds per plant is 1100 – 1250, and their weight is 65 –
70 g. The duration of flowering is 12 – 13 days. In the trial fields of DAI, the hybrid
went through two-year testing, showing a maximum yield of 4540 kg/ha, while in
Romania the maximum seed yield obtained in the process of official testing was 5300
kg/ha. The hybrid demonstrated high field resistance to the economically important
diseases and the parasite Orobanche. In 2010, hybrid Mihaela was provided to our
partners from Saaten Union – Romania; following one-year successful testing in
their trial fields, it was submitted for official testing within the system of the State Institute for Variety Testing and Registration – ISTIS, Romania. Averaged for the
three years of official testing at 10 locations, the new hybrid exceeded the standard
with 4 % by the index seed yield. In 2015, hybrid Mihaela was officially registered
in Romania with certificate No 1379/23.02.2015 and was enlisted in the European
Catalog of Field and Vegetable Crop Varieties.
