Resistance of soybean collection specimens to hazardous organisms

Abstract

The study presents results of studying resistance of 205 soybean collection specimens originating from 21 countries to a range of hazardous organism on artificial background of Fusarium and provocative backgrounds of bacteriosis and lima-bean pod borer in the eastern Forest-Steppe of Ukraine in 2009-2014.

The aim and tasks of the study. Search for new sources of resistance to pests and diseases is very important for soybean breeding. The study aim was to identify new genetic sources of soybean resistance to Fusarium,  bacteriosis, and lima-bean pod borer for further use in soybean breeding.

Material and Methods. The field studies were carried out in scientific rotation of the Plant Production Institute named after Yuriev V. Ya. of NAAS in an infectious nursery for pulses. Sowing and monitoring was conducted according to standard techniques using phytopathological, entomological and mycological research methods. Fusarium artificial infectious background was created by inoculating oat grain infected with Fusarium spp. agents simultaneously with soybean sowing in the amount of 100-150 g / m2. Provocative background of lima-bean pod borer was created by planting the test soybean collection specimens next to the Siberian pea shrub plantation, which is a reservoir of this pest.

Results and Discussion. The three-year studies identified soybean sources of individual, group and complex resistance to the diseases and pest. During the study period we selected 28 sources of individual resistance, of which eight are resistant to Fusarium and 20 - to bacteriosis. Twelve specimens with group resistance to Fusarium and bacteriosis were identified. Two specimens had complex resistance.

Conclusions. Over the six-year study period (2009-2014) we selected 42 new sources of soybean resistance to the diseases and pest, which are valuable source material and recommended for use in soybean breeding to create resistant varieties.