Characteristics of immunity to leaf diseases of winter wheat samples under the conditions of the north-east forest steppe of Ukraine a

Abstract

To realize the genetic potential of the productivity of bread winter wheat varieties, it is necessary to maintain a certain level of plant resistance to disease. Resistance donors may lose this property as a result of changes in the virulence of the pathogen and defeat of the genetic systems of plant resistance. This makes it necessary to search for new resistance sources and donors to leaf diseases. Our researches were conducted using field, laboratory and mathematical-statistical methods. Phenological observations, accounting, evaluation and harvesting were conducted according to currently accepted methods. 86 bread winter wheat samples from the 4th WWSRRN CIMMYT were studied for resistance to leaf diseases in our research during 2014–2016. The manifestation of variability depended significantly on the genotype for three diseases. The highest genotype influence was obseved in resistance to septoria dise­ase, where it was 81%. On average the highest indicator of resistance (7.7) to powdery mildew during the three years of research was observed in the mid-late ripening samples. The mid-early ripening group was considered to be the most adapted to the powdery mildew pathogen in the Northeastern Forest-Steppe. The highest average indicator of resistance (7.5) to brown rust for the three years of research was found in the early ripening group. The samples of the mid-ripening group were most adapted to the brown rust pathogen. The highest average resistance to septoria disease was also found in the early ripening group. The best adaptation to septoria disease was observed in mid-late ripening samples. 36% of the samples were resistant to three diseases. As a result of the research, a number of CIMMYT samples were isolated from the 4th WWSRRN, which exceeded the standard in resistance to powdery mildew, brown rust and septoria disease. They were characterized by better performance. Valuable forms for breeding work that can be resistance donors to leaf diseases were identified among them.

Genome-Plasmon Interaction Effect on Resistance to Septoriosis in Winter Triticum Aestivum L Alloplasmatic Lines

“…Euplasmic lines on these cultivars with cytoplasm of T. aestivum nuclear genome of Chinese Spring were as a control variant. Laying out of experiments, phenological observations, accounting and screening, harvesting were carried out according to generally accepted methods (Dospekhov, 1985;Tkachyk, 2016;Osmachko et al, 2020). The sample growing practice compares adopted in the area, aimed at growth optimizing and plant development.…”

“…The of sthrough nuclear apparatus inheritance occurred in 4% of the analyzed combinations. Resistance to the pathogen was mainly inherited as a dominant trait, or by type of intermediate inheritance (Osmachko et al, 2020). As far as septoria disease is a common disease in all regions of grain growing both in Ukraine and abroad (Figure 1), the shortage of grain yields with severe pathogen wheat damage increases every year and in some places can reach 40% (Zhukovsky et al, 2012).…”

Screening of winter wheat varieties for leaf diseases resistance

“…Analysis of the modern range indicates the presence of a small number of disease-resistant varieties. Therefore, the creation of varieties that combine high yield potential with disease resistance is one of the central issues in plant breeding and is the most economical, environmentally friendly, and justified method of pest control (Trybel et al,2006;Dmytrenko et al, 2019;Osmachko et al, 2020). The relevance of the research of bread winter wheat varieties resistance against leaf diseases on artificial infectious backgrounds of their pathogens is due to the need to reduce the use of pesticides during the growing of crops, where fungicides occupy a special place.…”